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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/uu/split/src/split.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>split.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../uu_split/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../uu_split/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../uu_split/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">1</span>
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|
||
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|
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||
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||
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||
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||
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||
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||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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||
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|
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|
||
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||
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||
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||
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||
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||
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||
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|
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||
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|
||
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|
||
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||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="619">619</span>
|
||
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|
||
<span id="621">621</span>
|
||
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|
||
<span id="623">623</span>
|
||
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|
||
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|
||
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|
||
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|
||
<span id="628">628</span>
|
||
<span id="629">629</span>
|
||
<span id="630">630</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="642">642</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="655">655</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="662">662</span>
|
||
<span id="663">663</span>
|
||
<span id="664">664</span>
|
||
<span id="665">665</span>
|
||
<span id="666">666</span>
|
||
<span id="667">667</span>
|
||
<span id="668">668</span>
|
||
<span id="669">669</span>
|
||
<span id="670">670</span>
|
||
<span id="671">671</span>
|
||
<span id="672">672</span>
|
||
<span id="673">673</span>
|
||
<span id="674">674</span>
|
||
<span id="675">675</span>
|
||
<span id="676">676</span>
|
||
<span id="677">677</span>
|
||
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|
||
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|
||
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|
||
<span id="681">681</span>
|
||
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|
||
<span id="683">683</span>
|
||
<span id="684">684</span>
|
||
<span id="685">685</span>
|
||
<span id="686">686</span>
|
||
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|
||
<span id="688">688</span>
|
||
<span id="689">689</span>
|
||
<span id="690">690</span>
|
||
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|
||
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|
||
<span id="693">693</span>
|
||
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|
||
<span id="695">695</span>
|
||
<span id="696">696</span>
|
||
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|
||
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|
||
<span id="699">699</span>
|
||
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|
||
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|
||
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|
||
<span id="703">703</span>
|
||
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|
||
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|
||
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|
||
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|
||
<span id="708">708</span>
|
||
<span id="709">709</span>
|
||
<span id="710">710</span>
|
||
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|
||
<span id="712">712</span>
|
||
<span id="713">713</span>
|
||
<span id="714">714</span>
|
||
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|
||
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|
||
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|
||
<span id="718">718</span>
|
||
<span id="719">719</span>
|
||
<span id="720">720</span>
|
||
<span id="721">721</span>
|
||
<span id="722">722</span>
|
||
<span id="723">723</span>
|
||
<span id="724">724</span>
|
||
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|
||
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|
||
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|
||
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|
||
<span id="729">729</span>
|
||
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|
||
<span id="731">731</span>
|
||
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|
||
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|
||
<span id="734">734</span>
|
||
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|
||
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|
||
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|
||
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|
||
<span id="739">739</span>
|
||
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|
||
<span id="741">741</span>
|
||
<span id="742">742</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="748">748</span>
|
||
<span id="749">749</span>
|
||
<span id="750">750</span>
|
||
<span id="751">751</span>
|
||
<span id="752">752</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="844">844</span>
|
||
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|
||
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|
||
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|
||
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
||
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|
||
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|
||
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|
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|
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|
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||
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||
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|
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|
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|
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|
||
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|
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|
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|
||
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|
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|
||
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|
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|
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|
||
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|
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|
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|
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|
||
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|
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|
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="1016">1016</span>
|
||
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|
||
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|
||
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|
||
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|
||
<span id="1021">1021</span>
|
||
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|
||
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|
||
<span id="1024">1024</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="1038">1038</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="1080">1080</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="1098">1098</span>
|
||
<span id="1099">1099</span>
|
||
<span id="1100">1100</span>
|
||
<span id="1101">1101</span>
|
||
<span id="1102">1102</span>
|
||
<span id="1103">1103</span>
|
||
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|
||
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|
||
<span id="1106">1106</span>
|
||
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|
||
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|
||
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|
||
<span id="1110">1110</span>
|
||
<span id="1111">1111</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="1120">1120</span>
|
||
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|
||
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|
||
<span id="1123">1123</span>
|
||
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|
||
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|
||
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|
||
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|
||
<span id="1128">1128</span>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="1264">1264</span>
|
||
<span id="1265">1265</span>
|
||
<span id="1266">1266</span>
|
||
<span id="1267">1267</span>
|
||
<span id="1268">1268</span>
|
||
<span id="1269">1269</span>
|
||
<span id="1270">1270</span>
|
||
<span id="1271">1271</span>
|
||
<span id="1272">1272</span>
|
||
<span id="1273">1273</span>
|
||
<span id="1274">1274</span>
|
||
<span id="1275">1275</span>
|
||
<span id="1276">1276</span>
|
||
<span id="1277">1277</span>
|
||
<span id="1278">1278</span>
|
||
<span id="1279">1279</span>
|
||
<span id="1280">1280</span>
|
||
<span id="1281">1281</span>
|
||
<span id="1282">1282</span>
|
||
<span id="1283">1283</span>
|
||
<span id="1284">1284</span>
|
||
<span id="1285">1285</span>
|
||
<span id="1286">1286</span>
|
||
<span id="1287">1287</span>
|
||
<span id="1288">1288</span>
|
||
<span id="1289">1289</span>
|
||
<span id="1290">1290</span>
|
||
<span id="1291">1291</span>
|
||
<span id="1292">1292</span>
|
||
<span id="1293">1293</span>
|
||
<span id="1294">1294</span>
|
||
<span id="1295">1295</span>
|
||
<span id="1296">1296</span>
|
||
<span id="1297">1297</span>
|
||
<span id="1298">1298</span>
|
||
<span id="1299">1299</span>
|
||
<span id="1300">1300</span>
|
||
<span id="1301">1301</span>
|
||
<span id="1302">1302</span>
|
||
<span id="1303">1303</span>
|
||
<span id="1304">1304</span>
|
||
<span id="1305">1305</span>
|
||
<span id="1306">1306</span>
|
||
<span id="1307">1307</span>
|
||
<span id="1308">1308</span>
|
||
<span id="1309">1309</span>
|
||
<span id="1310">1310</span>
|
||
<span id="1311">1311</span>
|
||
<span id="1312">1312</span>
|
||
<span id="1313">1313</span>
|
||
<span id="1314">1314</span>
|
||
<span id="1315">1315</span>
|
||
<span id="1316">1316</span>
|
||
<span id="1317">1317</span>
|
||
<span id="1318">1318</span>
|
||
<span id="1319">1319</span>
|
||
<span id="1320">1320</span>
|
||
<span id="1321">1321</span>
|
||
<span id="1322">1322</span>
|
||
<span id="1323">1323</span>
|
||
<span id="1324">1324</span>
|
||
<span id="1325">1325</span>
|
||
<span id="1326">1326</span>
|
||
<span id="1327">1327</span>
|
||
<span id="1328">1328</span>
|
||
<span id="1329">1329</span>
|
||
<span id="1330">1330</span>
|
||
<span id="1331">1331</span>
|
||
<span id="1332">1332</span>
|
||
<span id="1333">1333</span>
|
||
<span id="1334">1334</span>
|
||
<span id="1335">1335</span>
|
||
<span id="1336">1336</span>
|
||
<span id="1337">1337</span>
|
||
<span id="1338">1338</span>
|
||
<span id="1339">1339</span>
|
||
<span id="1340">1340</span>
|
||
<span id="1341">1341</span>
|
||
<span id="1342">1342</span>
|
||
<span id="1343">1343</span>
|
||
<span id="1344">1344</span>
|
||
<span id="1345">1345</span>
|
||
<span id="1346">1346</span>
|
||
<span id="1347">1347</span>
|
||
<span id="1348">1348</span>
|
||
<span id="1349">1349</span>
|
||
<span id="1350">1350</span>
|
||
<span id="1351">1351</span>
|
||
<span id="1352">1352</span>
|
||
<span id="1353">1353</span>
|
||
<span id="1354">1354</span>
|
||
<span id="1355">1355</span>
|
||
<span id="1356">1356</span>
|
||
<span id="1357">1357</span>
|
||
<span id="1358">1358</span>
|
||
<span id="1359">1359</span>
|
||
<span id="1360">1360</span>
|
||
<span id="1361">1361</span>
|
||
<span id="1362">1362</span>
|
||
<span id="1363">1363</span>
|
||
<span id="1364">1364</span>
|
||
<span id="1365">1365</span>
|
||
<span id="1366">1366</span>
|
||
<span id="1367">1367</span>
|
||
<span id="1368">1368</span>
|
||
<span id="1369">1369</span>
|
||
<span id="1370">1370</span>
|
||
<span id="1371">1371</span>
|
||
<span id="1372">1372</span>
|
||
<span id="1373">1373</span>
|
||
<span id="1374">1374</span>
|
||
<span id="1375">1375</span>
|
||
<span id="1376">1376</span>
|
||
<span id="1377">1377</span>
|
||
<span id="1378">1378</span>
|
||
<span id="1379">1379</span>
|
||
<span id="1380">1380</span>
|
||
<span id="1381">1381</span>
|
||
<span id="1382">1382</span>
|
||
<span id="1383">1383</span>
|
||
<span id="1384">1384</span>
|
||
</pre><pre class="rust"><code><span class="comment">// * This file is part of the uutils coreutils package.</span>
|
||
<span class="comment">// *</span>
|
||
<span class="comment">// * (c) Akira Hayakawa <ruby.wktk@gmail.com></span>
|
||
<span class="comment">// *</span>
|
||
<span class="comment">// * For the full copyright and license information, please view the LICENSE</span>
|
||
<span class="comment">// * file that was distributed with this source code.</span>
|
||
|
||
<span class="comment">// spell-checker:ignore (ToDO) PREFIXaa PREFIXab nbbbb ncccc</span>
|
||
|
||
<span class="kw">mod</span> <span class="ident">filenames</span>;
|
||
<span class="kw">mod</span> <span class="ident">number</span>;
|
||
<span class="kw">mod</span> <span class="ident">platform</span>;
|
||
|
||
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::filenames::FilenameIterator</span>;
|
||
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::filenames::SuffixType</span>;
|
||
<span class="kw">use</span> <span class="ident">clap</span>::{<span class="ident">crate_version</span>, <span class="ident">Arg</span>, <span class="ident">ArgMatches</span>, <span class="ident">Command</span>, <span class="ident">ValueSource</span>};
|
||
<span class="kw">use</span> <span class="ident">std::env</span>;
|
||
<span class="kw">use</span> <span class="ident">std::fmt</span>;
|
||
<span class="kw">use</span> <span class="ident">std::fs</span>::{<span class="ident">metadata</span>, <span class="ident">File</span>};
|
||
<span class="kw">use</span> <span class="ident">std::io</span>;
|
||
<span class="kw">use</span> <span class="ident">std::io</span>::{<span class="ident">stdin</span>, <span class="ident">BufRead</span>, <span class="ident">BufReader</span>, <span class="ident">BufWriter</span>, <span class="ident">ErrorKind</span>, <span class="ident">Read</span>, <span class="ident">Write</span>};
|
||
<span class="kw">use</span> <span class="ident">std::path::Path</span>;
|
||
<span class="kw">use</span> <span class="ident">uucore::display::Quotable</span>;
|
||
<span class="kw">use</span> <span class="ident">uucore::error</span>::{<span class="ident">FromIo</span>, <span class="ident">UIoError</span>, <span class="ident">UResult</span>, <span class="ident">USimpleError</span>, <span class="ident">UUsageError</span>};
|
||
<span class="kw">use</span> <span class="ident">uucore::format_usage</span>;
|
||
<span class="kw">use</span> <span class="ident">uucore::parse_size</span>::{<span class="ident">parse_size</span>, <span class="ident">ParseSizeError</span>};
|
||
<span class="kw">use</span> <span class="ident">uucore::uio_error</span>;
|
||
|
||
<span class="kw">static</span> <span class="ident">OPT_BYTES</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"bytes"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_LINE_BYTES</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"line-bytes"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_LINES</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"lines"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_ADDITIONAL_SUFFIX</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"additional-suffix"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_FILTER</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"filter"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_NUMBER</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"number"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_NUMERIC_SUFFIXES</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"numeric-suffixes"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_HEX_SUFFIXES</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"hex-suffixes"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_SUFFIX_LENGTH</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"suffix-length"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_DEFAULT_SUFFIX_LENGTH</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"0"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_VERBOSE</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"verbose"</span>;
|
||
<span class="comment">//The ---io-blksize parameter is consumed and ignored.</span>
|
||
<span class="comment">//The parameter is included to make GNU coreutils tests pass.</span>
|
||
<span class="kw">static</span> <span class="ident">OPT_IO_BLKSIZE</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"-io-blksize"</span>;
|
||
<span class="kw">static</span> <span class="ident">OPT_ELIDE_EMPTY_FILES</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"elide-empty-files"</span>;
|
||
|
||
<span class="kw">static</span> <span class="ident">ARG_INPUT</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"input"</span>;
|
||
<span class="kw">static</span> <span class="ident">ARG_PREFIX</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"prefix"</span>;
|
||
|
||
<span class="kw">const</span> <span class="ident">USAGE</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"{} [OPTION]... [INPUT [PREFIX]]"</span>;
|
||
<span class="kw">const</span> <span class="ident">AFTER_HELP</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"\
|
||
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default \
|
||
size is 1000, and default PREFIX is 'x'. With no INPUT, or when INPUT is \
|
||
-, read standard input."</span>;
|
||
|
||
<span class="attribute">#[<span class="ident">uucore::main</span>]</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">uumain</span>(<span class="ident">args</span>: <span class="kw">impl</span> <span class="ident">uucore::Args</span>) -> <span class="ident">UResult</span><span class="op"><</span>()<span class="op">></span> {
|
||
<span class="kw">let</span> <span class="ident">matches</span> <span class="op">=</span> <span class="ident">uu_app</span>().<span class="ident">try_get_matches_from</span>(<span class="ident">args</span>)<span class="question-mark">?</span>;
|
||
<span class="kw">match</span> <span class="ident">Settings::from</span>(<span class="kw-2">&</span><span class="ident">matches</span>) {
|
||
<span class="prelude-val">Ok</span>(<span class="ident">settings</span>) => <span class="ident">split</span>(<span class="kw-2">&</span><span class="ident">settings</span>),
|
||
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">requires_usage</span>() => <span class="prelude-val">Err</span>(<span class="ident">UUsageError::new</span>(<span class="number">1</span>, <span class="macro">format!</span>(<span class="string">"{}"</span>, <span class="ident">e</span>))),
|
||
<span class="prelude-val">Err</span>(<span class="ident">e</span>) => <span class="prelude-val">Err</span>(<span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="macro">format!</span>(<span class="string">"{}"</span>, <span class="ident">e</span>))),
|
||
}
|
||
}
|
||
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">uu_app</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>() -> <span class="ident">Command</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="ident">Command::new</span>(<span class="ident">uucore::util_name</span>())
|
||
.<span class="ident">version</span>(<span class="macro">crate_version!</span>())
|
||
.<span class="ident">about</span>(<span class="string">"Create output files containing consecutive or interleaved sections of input"</span>)
|
||
.<span class="ident">after_help</span>(<span class="ident">AFTER_HELP</span>)
|
||
.<span class="ident">override_usage</span>(<span class="ident">format_usage</span>(<span class="ident">USAGE</span>))
|
||
.<span class="ident">infer_long_args</span>(<span class="bool-val">true</span>)
|
||
<span class="comment">// strategy (mutually exclusive)</span>
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_BYTES</span>)
|
||
.<span class="ident">short</span>(<span class="string">'b'</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_BYTES</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">value_name</span>(<span class="string">"SIZE"</span>)
|
||
.<span class="ident">help</span>(<span class="string">"put SIZE bytes per output file"</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_LINE_BYTES</span>)
|
||
.<span class="ident">short</span>(<span class="string">'C'</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_LINE_BYTES</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">value_name</span>(<span class="string">"SIZE"</span>)
|
||
.<span class="ident">default_value</span>(<span class="string">"2"</span>)
|
||
.<span class="ident">help</span>(<span class="string">"put at most SIZE bytes of lines per output file"</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_LINES</span>)
|
||
.<span class="ident">short</span>(<span class="string">'l'</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_LINES</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">value_name</span>(<span class="string">"NUMBER"</span>)
|
||
.<span class="ident">default_value</span>(<span class="string">"1000"</span>)
|
||
.<span class="ident">help</span>(<span class="string">"put NUMBER lines/records per output file"</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_NUMBER</span>)
|
||
.<span class="ident">short</span>(<span class="string">'n'</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_NUMBER</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">value_name</span>(<span class="string">"CHUNKS"</span>)
|
||
.<span class="ident">help</span>(<span class="string">"generate CHUNKS output files; see explanation below"</span>),
|
||
)
|
||
<span class="comment">// rest of the arguments</span>
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_ADDITIONAL_SUFFIX</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_ADDITIONAL_SUFFIX</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">value_name</span>(<span class="string">"SUFFIX"</span>)
|
||
.<span class="ident">default_value</span>(<span class="string">""</span>)
|
||
.<span class="ident">help</span>(<span class="string">"additional SUFFIX to append to output file names"</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_FILTER</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_FILTER</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">value_name</span>(<span class="string">"COMMAND"</span>)
|
||
.<span class="ident">value_hint</span>(<span class="ident">clap::ValueHint::CommandName</span>)
|
||
.<span class="ident">help</span>(
|
||
<span class="string">"write to shell COMMAND; file name is $FILE (Currently not implemented for Windows)"</span>,
|
||
),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_ELIDE_EMPTY_FILES</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_ELIDE_EMPTY_FILES</span>)
|
||
.<span class="ident">short</span>(<span class="string">'e'</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">false</span>)
|
||
.<span class="ident">help</span>(<span class="string">"do not generate empty output files with '-n'"</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_NUMERIC_SUFFIXES</span>)
|
||
.<span class="ident">short</span>(<span class="string">'d'</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_NUMERIC_SUFFIXES</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">default_missing_value</span>(<span class="string">"0"</span>)
|
||
.<span class="ident">help</span>(<span class="string">"use numeric suffixes instead of alphabetic"</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_SUFFIX_LENGTH</span>)
|
||
.<span class="ident">short</span>(<span class="string">'a'</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_SUFFIX_LENGTH</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">value_name</span>(<span class="string">"N"</span>)
|
||
.<span class="ident">default_value</span>(<span class="ident">OPT_DEFAULT_SUFFIX_LENGTH</span>)
|
||
.<span class="ident">help</span>(<span class="string">"use suffixes of fixed length N. 0 implies dynamic length."</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_HEX_SUFFIXES</span>)
|
||
.<span class="ident">short</span>(<span class="string">'x'</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_HEX_SUFFIXES</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">default_missing_value</span>(<span class="string">"0"</span>)
|
||
.<span class="ident">help</span>(<span class="string">"use hex suffixes instead of alphabetic"</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_VERBOSE</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_VERBOSE</span>)
|
||
.<span class="ident">help</span>(<span class="string">"print a diagnostic just before each output file is opened"</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">OPT_IO_BLKSIZE</span>)
|
||
.<span class="ident">long</span>(<span class="ident">OPT_IO_BLKSIZE</span>)
|
||
.<span class="ident">alias</span>(<span class="ident">OPT_IO_BLKSIZE</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">hide</span>(<span class="bool-val">true</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">ARG_INPUT</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">default_value</span>(<span class="string">"-"</span>)
|
||
.<span class="ident">index</span>(<span class="number">1</span>)
|
||
.<span class="ident">value_hint</span>(<span class="ident">clap::ValueHint::FilePath</span>),
|
||
)
|
||
.<span class="ident">arg</span>(
|
||
<span class="ident">Arg::new</span>(<span class="ident">ARG_PREFIX</span>)
|
||
.<span class="ident">takes_value</span>(<span class="bool-val">true</span>)
|
||
.<span class="ident">default_value</span>(<span class="string">"x"</span>)
|
||
.<span class="ident">index</span>(<span class="number">2</span>),
|
||
)
|
||
}
|
||
|
||
<span class="doccomment">/// Sub-strategy to use when splitting a file into a specific number of chunks.</span>
|
||
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
|
||
<span class="kw">enum</span> <span class="ident">NumberType</span> {
|
||
<span class="doccomment">/// Split into a specific number of chunks by byte.</span>
|
||
<span class="ident">Bytes</span>(<span class="ident">u64</span>),
|
||
|
||
<span class="doccomment">/// Split into a specific number of chunks by line (approximately).</span>
|
||
<span class="ident">Lines</span>(<span class="ident">u64</span>),
|
||
|
||
<span class="doccomment">/// Split into a specific number of chunks by line</span>
|
||
<span class="doccomment">/// (approximately), but output only the *k*th chunk.</span>
|
||
<span class="ident">KthLines</span>(<span class="ident">u64</span>, <span class="ident">u64</span>),
|
||
|
||
<span class="doccomment">/// Assign lines via round-robin to the specified number of output chunks.</span>
|
||
<span class="ident">RoundRobin</span>(<span class="ident">u64</span>),
|
||
|
||
<span class="doccomment">/// Assign lines via round-robin to the specified number of output</span>
|
||
<span class="doccomment">/// chunks, but output only the *k*th chunk.</span>
|
||
<span class="ident">KthRoundRobin</span>(<span class="ident">u64</span>, <span class="ident">u64</span>),
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">NumberType</span> {
|
||
<span class="doccomment">/// The number of chunks for this number type.</span>
|
||
<span class="kw">fn</span> <span class="ident">num_chunks</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">u64</span> {
|
||
<span class="kw">match</span> <span class="self">self</span> {
|
||
<span class="ident"><span class="self">Self</span>::Bytes</span>(<span class="ident">n</span>) => <span class="kw-2">*</span><span class="ident">n</span>,
|
||
<span class="ident"><span class="self">Self</span>::Lines</span>(<span class="ident">n</span>) => <span class="kw-2">*</span><span class="ident">n</span>,
|
||
<span class="ident"><span class="self">Self</span>::KthLines</span>(<span class="kw">_</span>, <span class="ident">n</span>) => <span class="kw-2">*</span><span class="ident">n</span>,
|
||
<span class="ident"><span class="self">Self</span>::RoundRobin</span>(<span class="ident">n</span>) => <span class="kw-2">*</span><span class="ident">n</span>,
|
||
<span class="ident"><span class="self">Self</span>::KthRoundRobin</span>(<span class="kw">_</span>, <span class="ident">n</span>) => <span class="kw-2">*</span><span class="ident">n</span>,
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// An error due to an invalid parameter to the `-n` command-line option.</span>
|
||
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
|
||
<span class="kw">enum</span> <span class="ident">NumberTypeError</span> {
|
||
<span class="doccomment">/// The number of chunks was invalid.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This can happen if the value of `N` in any of the following</span>
|
||
<span class="doccomment">/// command-line options is not a positive integer:</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```ignore</span>
|
||
<span class="doccomment">/// -n N</span>
|
||
<span class="doccomment">/// -n l/N</span>
|
||
<span class="doccomment">/// -n l/K/N</span>
|
||
<span class="doccomment">/// -n r/N</span>
|
||
<span class="doccomment">/// -n r/K/N</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="ident">NumberOfChunks</span>(<span class="ident">String</span>),
|
||
|
||
<span class="doccomment">/// The chunk number was invalid.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This can happen if the value of `K` in any of the following</span>
|
||
<span class="doccomment">/// command-line options is not a positive integer:</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```ignore</span>
|
||
<span class="doccomment">/// -n l/K/N</span>
|
||
<span class="doccomment">/// -n r/K/N</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="ident">ChunkNumber</span>(<span class="ident">String</span>),
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">NumberType</span> {
|
||
<span class="doccomment">/// Parse a `NumberType` from a string.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The following strings are valid arguments:</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```ignore</span>
|
||
<span class="doccomment">/// "N"</span>
|
||
<span class="doccomment">/// "l/N"</span>
|
||
<span class="doccomment">/// "l/K/N"</span>
|
||
<span class="doccomment">/// "r/N"</span>
|
||
<span class="doccomment">/// "r/K/N"</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The `N` represents the number of chunks and the `K` represents</span>
|
||
<span class="doccomment">/// a chunk number.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Errors</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// If the string is not one of the valid number types, if `K` is</span>
|
||
<span class="doccomment">/// not a nonnegative integer, or if `N` is not a positive</span>
|
||
<span class="doccomment">/// integer, then this function returns [`NumberTypeError`].</span>
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">NumberTypeError</span><span class="op">></span> {
|
||
<span class="kw">let</span> <span class="ident">parts</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">split</span>(<span class="string">'/'</span>).<span class="ident">collect</span>();
|
||
<span class="kw">match</span> <span class="kw-2">&</span><span class="ident">parts</span>[..] {
|
||
[<span class="ident">n_str</span>] => {
|
||
<span class="kw">let</span> <span class="ident">num_chunks</span> <span class="op">=</span> <span class="ident">n_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="ident">n_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::Bytes</span>(<span class="ident">num_chunks</span>))
|
||
}
|
||
[<span class="string">"l"</span>, <span class="ident">n_str</span>] => {
|
||
<span class="kw">let</span> <span class="ident">num_chunks</span> <span class="op">=</span> <span class="ident">n_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="ident">n_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::Lines</span>(<span class="ident">num_chunks</span>))
|
||
}
|
||
[<span class="string">"l"</span>, <span class="ident">k_str</span>, <span class="ident">n_str</span>] => {
|
||
<span class="kw">let</span> <span class="ident">num_chunks</span> <span class="op">=</span> <span class="ident">n_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="ident">n_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">chunk_number</span> <span class="op">=</span> <span class="ident">k_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">NumberTypeError::ChunkNumber</span>(<span class="ident">k_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::KthLines</span>(<span class="ident">chunk_number</span>, <span class="ident">num_chunks</span>))
|
||
}
|
||
[<span class="string">"r"</span>, <span class="ident">n_str</span>] => {
|
||
<span class="kw">let</span> <span class="ident">num_chunks</span> <span class="op">=</span> <span class="ident">n_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="ident">n_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::RoundRobin</span>(<span class="ident">num_chunks</span>))
|
||
}
|
||
[<span class="string">"r"</span>, <span class="ident">k_str</span>, <span class="ident">n_str</span>] => {
|
||
<span class="kw">let</span> <span class="ident">num_chunks</span> <span class="op">=</span> <span class="ident">n_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="ident">n_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">chunk_number</span> <span class="op">=</span> <span class="ident">k_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">NumberTypeError::ChunkNumber</span>(<span class="ident">k_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::KthRoundRobin</span>(<span class="ident">chunk_number</span>, <span class="ident">num_chunks</span>))
|
||
}
|
||
<span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="ident">s</span>.<span class="ident">to_string</span>())),
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// The strategy for breaking up the input file into chunks.</span>
|
||
<span class="kw">enum</span> <span class="ident">Strategy</span> {
|
||
<span class="doccomment">/// Each chunk has the specified number of lines.</span>
|
||
<span class="ident">Lines</span>(<span class="ident">u64</span>),
|
||
|
||
<span class="doccomment">/// Each chunk has the specified number of bytes.</span>
|
||
<span class="ident">Bytes</span>(<span class="ident">u64</span>),
|
||
|
||
<span class="doccomment">/// Each chunk has as many lines as possible without exceeding the</span>
|
||
<span class="doccomment">/// specified number of bytes.</span>
|
||
<span class="ident">LineBytes</span>(<span class="ident">u64</span>),
|
||
|
||
<span class="doccomment">/// Split the file into this many chunks.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// There are several sub-strategies available, as defined by</span>
|
||
<span class="doccomment">/// [`NumberType`].</span>
|
||
<span class="ident">Number</span>(<span class="ident">NumberType</span>),
|
||
}
|
||
|
||
<span class="doccomment">/// An error when parsing a chunking strategy from command-line arguments.</span>
|
||
<span class="kw">enum</span> <span class="ident">StrategyError</span> {
|
||
<span class="doccomment">/// Invalid number of lines.</span>
|
||
<span class="ident">Lines</span>(<span class="ident">ParseSizeError</span>),
|
||
|
||
<span class="doccomment">/// Invalid number of bytes.</span>
|
||
<span class="ident">Bytes</span>(<span class="ident">ParseSizeError</span>),
|
||
|
||
<span class="doccomment">/// Invalid number type.</span>
|
||
<span class="ident">NumberType</span>(<span class="ident">NumberTypeError</span>),
|
||
|
||
<span class="doccomment">/// Multiple chunking strategies were specified (but only one should be).</span>
|
||
<span class="ident">MultipleWays</span>,
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">StrategyError</span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> {
|
||
<span class="kw">match</span> <span class="self">self</span> {
|
||
<span class="ident"><span class="self">Self</span>::Lines</span>(<span class="ident">e</span>) => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"invalid number of lines: {}"</span>, <span class="ident">e</span>),
|
||
<span class="ident"><span class="self">Self</span>::Bytes</span>(<span class="ident">e</span>) => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"invalid number of bytes: {}"</span>, <span class="ident">e</span>),
|
||
<span class="ident"><span class="self">Self</span>::NumberType</span>(<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="ident">s</span>)) => {
|
||
<span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"invalid number of chunks: {}"</span>, <span class="ident">s</span>)
|
||
}
|
||
<span class="ident"><span class="self">Self</span>::NumberType</span>(<span class="ident">NumberTypeError::ChunkNumber</span>(<span class="ident">s</span>)) => {
|
||
<span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"invalid chunk number: {}"</span>, <span class="ident">s</span>)
|
||
}
|
||
<span class="ident"><span class="self">Self</span>::MultipleWays</span> => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"cannot split in more than one way"</span>),
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">Strategy</span> {
|
||
<span class="doccomment">/// Parse a strategy from the command-line arguments.</span>
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">matches</span>: <span class="kw-2">&</span><span class="ident">ArgMatches</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">StrategyError</span><span class="op">></span> {
|
||
<span class="comment">// Check that the user is not specifying more than one strategy.</span>
|
||
<span class="comment">//</span>
|
||
<span class="comment">// Note: right now, this exact behavior cannot be handled by</span>
|
||
<span class="comment">// `ArgGroup` since `ArgGroup` considers a default value `Arg`</span>
|
||
<span class="comment">// as "defined".</span>
|
||
<span class="kw">match</span> (
|
||
<span class="ident">matches</span>.<span class="ident">value_source</span>(<span class="ident">OPT_LINES</span>) <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">ValueSource::CommandLine</span>),
|
||
<span class="ident">matches</span>.<span class="ident">value_source</span>(<span class="ident">OPT_BYTES</span>) <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">ValueSource::CommandLine</span>),
|
||
<span class="ident">matches</span>.<span class="ident">value_source</span>(<span class="ident">OPT_LINE_BYTES</span>) <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">ValueSource::CommandLine</span>),
|
||
<span class="ident">matches</span>.<span class="ident">value_source</span>(<span class="ident">OPT_NUMBER</span>) <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">ValueSource::CommandLine</span>),
|
||
) {
|
||
(<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>) => <span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::Lines</span>(<span class="number">1000</span>)),
|
||
(<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>) => {
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">OPT_LINES</span>).<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">parse_size</span>(<span class="ident">s</span>).<span class="ident">map_err</span>(<span class="ident">StrategyError::Lines</span>)<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::Lines</span>(<span class="ident">n</span>))
|
||
}
|
||
(<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>) => {
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">OPT_BYTES</span>).<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">parse_size</span>(<span class="ident">s</span>).<span class="ident">map_err</span>(<span class="ident">StrategyError::Bytes</span>)<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::Bytes</span>(<span class="ident">n</span>))
|
||
}
|
||
(<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) => {
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">OPT_LINE_BYTES</span>).<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">parse_size</span>(<span class="ident">s</span>).<span class="ident">map_err</span>(<span class="ident">StrategyError::Bytes</span>)<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::LineBytes</span>(<span class="ident">n</span>))
|
||
}
|
||
(<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>) => {
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">OPT_NUMBER</span>).<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">number_type</span> <span class="op">=</span> <span class="ident">NumberType::from</span>(<span class="ident">s</span>).<span class="ident">map_err</span>(<span class="ident">StrategyError::NumberType</span>)<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::Number</span>(<span class="ident">number_type</span>))
|
||
}
|
||
<span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">StrategyError::MultipleWays</span>),
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Parse the suffix type from the command-line arguments.</span>
|
||
<span class="kw">fn</span> <span class="ident">suffix_type_from</span>(<span class="ident">matches</span>: <span class="kw-2">&</span><span class="ident">ArgMatches</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">SuffixType</span>, <span class="ident">usize</span>), <span class="ident">SettingsError</span><span class="op">></span> {
|
||
<span class="kw">if</span> <span class="ident">matches</span>.<span class="ident">value_source</span>(<span class="ident">OPT_NUMERIC_SUFFIXES</span>) <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">ValueSource::CommandLine</span>) {
|
||
<span class="kw">let</span> <span class="ident">suffix_start</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">value_of</span>(<span class="ident">OPT_NUMERIC_SUFFIXES</span>);
|
||
<span class="kw">let</span> <span class="ident">suffix_start</span> <span class="op">=</span> <span class="ident">suffix_start</span>.<span class="ident">ok_or</span>(<span class="ident">SettingsError::SuffixNotParsable</span>(<span class="ident">String::new</span>()))<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">suffix_start</span> <span class="op">=</span> <span class="ident">suffix_start</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">SettingsError::SuffixNotParsable</span>(<span class="ident">suffix_start</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>((<span class="ident">SuffixType::Decimal</span>, <span class="ident">suffix_start</span>))
|
||
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">matches</span>.<span class="ident">value_source</span>(<span class="ident">OPT_HEX_SUFFIXES</span>) <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">ValueSource::CommandLine</span>) {
|
||
<span class="kw">let</span> <span class="ident">suffix_start</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">value_of</span>(<span class="ident">OPT_HEX_SUFFIXES</span>);
|
||
<span class="kw">let</span> <span class="ident">suffix_start</span> <span class="op">=</span> <span class="ident">suffix_start</span>.<span class="ident">ok_or</span>(<span class="ident">SettingsError::SuffixNotParsable</span>(<span class="ident">String::new</span>()))<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">suffix_start</span> <span class="op">=</span> <span class="ident">usize::from_str_radix</span>(<span class="ident">suffix_start</span>, <span class="number">16</span>)
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">SettingsError::SuffixNotParsable</span>(<span class="ident">suffix_start</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>((<span class="ident">SuffixType::Hexadecimal</span>, <span class="ident">suffix_start</span>))
|
||
} <span class="kw">else</span> {
|
||
<span class="comment">// no numeric/hex suffix</span>
|
||
<span class="prelude-val">Ok</span>((<span class="ident">SuffixType::Alphabetic</span>, <span class="number">0</span>))
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Parameters that control how a file gets split.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// You can convert an [`ArgMatches`] instance into a [`Settings`]</span>
|
||
<span class="doccomment">/// instance by calling [`Settings::from`].</span>
|
||
<span class="kw">struct</span> <span class="ident">Settings</span> {
|
||
<span class="ident">prefix</span>: <span class="ident">String</span>,
|
||
<span class="ident">suffix_type</span>: <span class="ident">SuffixType</span>,
|
||
<span class="ident">suffix_length</span>: <span class="ident">usize</span>,
|
||
<span class="ident">suffix_start</span>: <span class="ident">usize</span>,
|
||
<span class="ident">additional_suffix</span>: <span class="ident">String</span>,
|
||
<span class="ident">input</span>: <span class="ident">String</span>,
|
||
<span class="doccomment">/// When supplied, a shell command to output to instead of xaa, xab …</span>
|
||
<span class="ident">filter</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
|
||
<span class="ident">strategy</span>: <span class="ident">Strategy</span>,
|
||
<span class="ident">verbose</span>: <span class="ident">bool</span>,
|
||
|
||
<span class="doccomment">/// Whether to *not* produce empty files when using `-n`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The `-n` command-line argument gives a specific number of</span>
|
||
<span class="doccomment">/// chunks into which the input files will be split. If the number</span>
|
||
<span class="doccomment">/// of chunks is greater than the number of bytes, and this is</span>
|
||
<span class="doccomment">/// `false`, then empty files will be created for the excess</span>
|
||
<span class="doccomment">/// chunks. If this is `false`, then empty files will not be</span>
|
||
<span class="doccomment">/// created.</span>
|
||
<span class="ident">elide_empty_files</span>: <span class="ident">bool</span>,
|
||
}
|
||
|
||
<span class="doccomment">/// An error when parsing settings from command-line arguments.</span>
|
||
<span class="kw">enum</span> <span class="ident">SettingsError</span> {
|
||
<span class="doccomment">/// Invalid chunking strategy.</span>
|
||
<span class="ident">Strategy</span>(<span class="ident">StrategyError</span>),
|
||
|
||
<span class="doccomment">/// Invalid suffix length parameter.</span>
|
||
<span class="ident">SuffixNotParsable</span>(<span class="ident">String</span>),
|
||
|
||
<span class="doccomment">/// Suffix contains a directory separator, which is not allowed.</span>
|
||
<span class="ident">SuffixContainsSeparator</span>(<span class="ident">String</span>),
|
||
|
||
<span class="doccomment">/// Suffix is not large enough to split into specified chunks</span>
|
||
<span class="ident">SuffixTooSmall</span>(<span class="ident">usize</span>),
|
||
|
||
<span class="doccomment">/// The `--filter` option is not supported on Windows.</span>
|
||
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">windows</span>)]</span>
|
||
<span class="ident">NotSupported</span>,
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">SettingsError</span> {
|
||
<span class="doccomment">/// Whether the error demands a usage message.</span>
|
||
<span class="kw">fn</span> <span class="ident">requires_usage</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> {
|
||
<span class="macro">matches!</span>(
|
||
<span class="self">self</span>,
|
||
<span class="ident"><span class="self">Self</span>::Strategy</span>(<span class="ident">StrategyError::MultipleWays</span>) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::SuffixContainsSeparator</span>(<span class="kw">_</span>)
|
||
)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">SettingsError</span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> {
|
||
<span class="kw">match</span> <span class="self">self</span> {
|
||
<span class="ident"><span class="self">Self</span>::Strategy</span>(<span class="ident">e</span>) => <span class="ident">e</span>.<span class="ident">fmt</span>(<span class="ident">f</span>),
|
||
<span class="ident"><span class="self">Self</span>::SuffixNotParsable</span>(<span class="ident">s</span>) => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"invalid suffix length: {}"</span>, <span class="ident">s</span>.<span class="ident">quote</span>()),
|
||
<span class="ident"><span class="self">Self</span>::SuffixTooSmall</span>(<span class="ident">i</span>) => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"the suffix length needs to be at least {}"</span>, <span class="ident">i</span>),
|
||
<span class="ident"><span class="self">Self</span>::SuffixContainsSeparator</span>(<span class="ident">s</span>) => <span class="macro">write!</span>(
|
||
<span class="ident">f</span>,
|
||
<span class="string">"invalid suffix {}, contains directory separator"</span>,
|
||
<span class="ident">s</span>.<span class="ident">quote</span>()
|
||
),
|
||
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">windows</span>)]</span>
|
||
<span class="ident"><span class="self">Self</span>::NotSupported</span> => <span class="macro">write!</span>(
|
||
<span class="ident">f</span>,
|
||
<span class="string">"{} is currently not supported in this platform"</span>,
|
||
<span class="ident">OPT_FILTER</span>
|
||
),
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">Settings</span> {
|
||
<span class="doccomment">/// Parse a strategy from the command-line arguments.</span>
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">matches</span>: <span class="kw-2">&</span><span class="ident">ArgMatches</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">SettingsError</span><span class="op">></span> {
|
||
<span class="kw">let</span> <span class="ident">additional_suffix</span> <span class="op">=</span> <span class="ident">matches</span>
|
||
.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">OPT_ADDITIONAL_SUFFIX</span>)
|
||
.<span class="ident">unwrap</span>()
|
||
.<span class="ident">to_string</span>();
|
||
<span class="kw">if</span> <span class="ident">additional_suffix</span>.<span class="ident">contains</span>(<span class="string">'/'</span>) {
|
||
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SettingsError::SuffixContainsSeparator</span>(<span class="ident">additional_suffix</span>));
|
||
}
|
||
<span class="kw">let</span> <span class="ident">strategy</span> <span class="op">=</span> <span class="ident">Strategy::from</span>(<span class="ident">matches</span>).<span class="ident">map_err</span>(<span class="ident">SettingsError::Strategy</span>)<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> (<span class="ident">suffix_type</span>, <span class="ident">suffix_start</span>) <span class="op">=</span> <span class="ident">suffix_type_from</span>(<span class="ident">matches</span>)<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">suffix_length_str</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">OPT_SUFFIX_LENGTH</span>).<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">suffix_length</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">suffix_length_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">SettingsError::SuffixNotParsable</span>(<span class="ident">suffix_length_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
|
||
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Strategy::Number</span>(<span class="kw-2">ref</span> <span class="ident">number_type</span>) <span class="op">=</span> <span class="ident">strategy</span> {
|
||
<span class="kw">let</span> <span class="ident">chunks</span> <span class="op">=</span> <span class="ident">number_type</span>.<span class="ident">num_chunks</span>();
|
||
<span class="kw">if</span> <span class="ident">suffix_length</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
|
||
<span class="kw">let</span> <span class="ident">required_suffix_length</span> <span class="op">=</span>
|
||
(<span class="ident">chunks</span> <span class="kw">as</span> <span class="ident">f64</span>).<span class="ident">log</span>(<span class="ident">suffix_type</span>.<span class="ident">radix</span>() <span class="kw">as</span> <span class="ident">f64</span>).<span class="ident">ceil</span>() <span class="kw">as</span> <span class="ident">usize</span>;
|
||
<span class="kw">if</span> <span class="ident">suffix_length</span> <span class="op"><</span> <span class="ident">required_suffix_length</span> {
|
||
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SettingsError::SuffixTooSmall</span>(<span class="ident">required_suffix_length</span>));
|
||
}
|
||
}
|
||
}
|
||
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="self">Self</span> {
|
||
<span class="ident">suffix_length</span>: <span class="ident">suffix_length_str</span>
|
||
.<span class="ident">parse</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">SettingsError::SuffixNotParsable</span>(<span class="ident">suffix_length_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>,
|
||
<span class="ident">suffix_type</span>,
|
||
<span class="ident">suffix_start</span>,
|
||
<span class="ident">additional_suffix</span>,
|
||
<span class="ident">verbose</span>: <span class="ident">matches</span>.<span class="ident">value_source</span>(<span class="string">"verbose"</span>) <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">ValueSource::CommandLine</span>),
|
||
<span class="ident">strategy</span>,
|
||
<span class="ident">input</span>: <span class="ident">matches</span>.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">ARG_INPUT</span>).<span class="ident">unwrap</span>().<span class="ident">to_owned</span>(),
|
||
<span class="ident">prefix</span>: <span class="ident">matches</span>.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">ARG_PREFIX</span>).<span class="ident">unwrap</span>().<span class="ident">to_owned</span>(),
|
||
<span class="ident">filter</span>: <span class="ident">matches</span>.<span class="ident">get_one</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">OPT_FILTER</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_owned</span>()),
|
||
<span class="ident">elide_empty_files</span>: <span class="ident">matches</span>.<span class="ident">contains_id</span>(<span class="ident">OPT_ELIDE_EMPTY_FILES</span>),
|
||
};
|
||
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">windows</span>)]</span>
|
||
<span class="kw">if</span> <span class="ident">result</span>.<span class="ident">filter</span>.<span class="ident">is_some</span>() {
|
||
<span class="comment">// see https://github.com/rust-lang/rust/issues/29494</span>
|
||
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SettingsError::NotSupported</span>);
|
||
}
|
||
|
||
<span class="prelude-val">Ok</span>(<span class="ident">result</span>)
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">instantiate_current_writer</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">filename</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="ident">io::Result</span><span class="op"><</span><span class="ident">BufWriter</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Write</span><span class="op">></span><span class="op">></span><span class="op">></span> {
|
||
<span class="kw">if</span> <span class="ident">platform::paths_refer_to_same_file</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">input</span>, <span class="ident">filename</span>) {
|
||
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io::Error::new</span>(
|
||
<span class="ident">ErrorKind::Other</span>,
|
||
<span class="macro">format!</span>(<span class="string">"'{}' would overwrite input; aborting"</span>, <span class="ident">filename</span>),
|
||
));
|
||
}
|
||
|
||
<span class="ident">platform::instantiate_current_writer</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">filter</span>, <span class="ident">filename</span>)
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Write a certain number of bytes to one file, then move on to another one.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This struct maintains an underlying writer representing the</span>
|
||
<span class="doccomment">/// current chunk of the output. If a call to [`write`] would cause</span>
|
||
<span class="doccomment">/// the underlying writer to write more than the allowed number of</span>
|
||
<span class="doccomment">/// bytes, a new writer is created and the excess bytes are written to</span>
|
||
<span class="doccomment">/// that one instead. As many new underlying writers are created as</span>
|
||
<span class="doccomment">/// needed to write all the bytes in the input buffer.</span>
|
||
<span class="kw">struct</span> <span class="ident">ByteChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="doccomment">/// Parameters for creating the underlying writer for each new chunk.</span>
|
||
<span class="ident">settings</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Settings</span>,
|
||
|
||
<span class="doccomment">/// The maximum number of bytes allowed for a single chunk of output.</span>
|
||
<span class="ident">chunk_size</span>: <span class="ident">u64</span>,
|
||
|
||
<span class="doccomment">/// Running total of number of chunks that have been completed.</span>
|
||
<span class="ident">num_chunks_written</span>: <span class="ident">u64</span>,
|
||
|
||
<span class="doccomment">/// Remaining capacity in number of bytes in the current chunk.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This number starts at `chunk_size` and decreases as bytes are</span>
|
||
<span class="doccomment">/// written. Once it reaches zero, a writer for a new chunk is</span>
|
||
<span class="doccomment">/// initialized and this number gets reset to `chunk_size`.</span>
|
||
<span class="ident">num_bytes_remaining_in_current_chunk</span>: <span class="ident">u64</span>,
|
||
|
||
<span class="doccomment">/// The underlying writer for the current chunk.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Once the number of bytes written to this writer exceeds</span>
|
||
<span class="doccomment">/// `chunk_size`, a new writer is initialized and assigned to this</span>
|
||
<span class="doccomment">/// field.</span>
|
||
<span class="ident">inner</span>: <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Write</span><span class="op">></span><span class="op">></span>,
|
||
|
||
<span class="doccomment">/// Iterator that yields filenames for each chunk.</span>
|
||
<span class="ident">filename_iterator</span>: <span class="ident">FilenameIterator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">ByteChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">chunk_size</span>: <span class="ident">u64</span>, <span class="ident">settings</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Settings</span>) -> <span class="ident">UResult</span><span class="op"><</span><span class="ident">ByteChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span> {
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">filename_iterator</span> <span class="op">=</span> <span class="ident">FilenameIterator::new</span>(
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">prefix</span>,
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">additional_suffix</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_length</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_type</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_start</span>,
|
||
)<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">filename</span> <span class="op">=</span> <span class="ident">filename_iterator</span>
|
||
.<span class="ident">next</span>()
|
||
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="string">"output file suffixes exhausted"</span>))<span class="question-mark">?</span>;
|
||
<span class="kw">if</span> <span class="ident">settings</span>.<span class="ident">verbose</span> {
|
||
<span class="macro">println!</span>(<span class="string">"creating file {}"</span>, <span class="ident">filename</span>.<span class="ident">quote</span>());
|
||
}
|
||
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">filename</span>)<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident">ByteChunkWriter</span> {
|
||
<span class="ident">settings</span>,
|
||
<span class="ident">chunk_size</span>,
|
||
<span class="ident">num_bytes_remaining_in_current_chunk</span>: <span class="ident">chunk_size</span>,
|
||
<span class="ident">num_chunks_written</span>: <span class="number">0</span>,
|
||
<span class="ident">inner</span>,
|
||
<span class="ident">filename_iterator</span>,
|
||
})
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">ByteChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) -> <span class="ident">std::io::Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
|
||
<span class="comment">// If the length of `buf` exceeds the number of bytes remaining</span>
|
||
<span class="comment">// in the current chunk, we will need to write to multiple</span>
|
||
<span class="comment">// different underlying writers. In that case, each iteration of</span>
|
||
<span class="comment">// this loop writes to the underlying writer that corresponds to</span>
|
||
<span class="comment">// the current chunk number.</span>
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">carryover_bytes_written</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
|
||
<span class="kw">loop</span> {
|
||
<span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">is_empty</span>() {
|
||
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">carryover_bytes_written</span>);
|
||
}
|
||
|
||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">==</span> <span class="number">0</span> {
|
||
<span class="comment">// Increment the chunk number, reset the number of bytes remaining, and instantiate the new underlying writer.</span>
|
||
<span class="self">self</span>.<span class="ident">num_chunks_written</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
|
||
<span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">chunk_size</span>;
|
||
|
||
<span class="comment">// Allocate the new file, since at this point we know there are bytes to be written to it.</span>
|
||
<span class="kw">let</span> <span class="ident">filename</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">filename_iterator</span>.<span class="ident">next</span>().<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> {
|
||
<span class="ident">std::io::Error::new</span>(<span class="ident">ErrorKind::Other</span>, <span class="string">"output file suffixes exhausted"</span>)
|
||
})<span class="question-mark">?</span>;
|
||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">verbose</span> {
|
||
<span class="macro">println!</span>(<span class="string">"creating file {}"</span>, <span class="ident">filename</span>.<span class="ident">quote</span>());
|
||
}
|
||
<span class="self">self</span>.<span class="ident">inner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">filename</span>)<span class="question-mark">?</span>;
|
||
}
|
||
|
||
<span class="comment">// If the capacity of this chunk is greater than the number of</span>
|
||
<span class="comment">// bytes in `buf`, then write all the bytes in `buf`. Otherwise,</span>
|
||
<span class="comment">// write enough bytes to fill the current chunk, then increment</span>
|
||
<span class="comment">// the chunk number and repeat.</span>
|
||
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>();
|
||
<span class="kw">if</span> (<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u64</span>) <span class="op"><</span> <span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> {
|
||
<span class="kw">let</span> <span class="ident">num_bytes_written</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="ident">buf</span>)<span class="question-mark">?</span>;
|
||
<span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">-</span><span class="op">=</span> <span class="ident">num_bytes_written</span> <span class="kw">as</span> <span class="ident">u64</span>;
|
||
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">carryover_bytes_written</span> <span class="op">+</span> <span class="ident">num_bytes_written</span>);
|
||
} <span class="kw">else</span> {
|
||
<span class="comment">// Write enough bytes to fill the current chunk.</span>
|
||
<span class="comment">//</span>
|
||
<span class="comment">// Conversion to usize is safe because we checked that</span>
|
||
<span class="comment">// self.num_bytes_remaining_in_current_chunk is lower than</span>
|
||
<span class="comment">// n, which is already usize.</span>
|
||
<span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="kw">as</span> <span class="ident">usize</span>;
|
||
<span class="kw">let</span> <span class="ident">num_bytes_written</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..<span class="ident">i</span>])<span class="question-mark">?</span>;
|
||
<span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">-</span><span class="op">=</span> <span class="ident">num_bytes_written</span> <span class="kw">as</span> <span class="ident">u64</span>;
|
||
|
||
<span class="comment">// It's possible that the underlying writer did not</span>
|
||
<span class="comment">// write all the bytes.</span>
|
||
<span class="kw">if</span> <span class="ident">num_bytes_written</span> <span class="op"><</span> <span class="ident">i</span> {
|
||
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">carryover_bytes_written</span> <span class="op">+</span> <span class="ident">num_bytes_written</span>);
|
||
} <span class="kw">else</span> {
|
||
<span class="comment">// Move the window to look at only the remaining bytes.</span>
|
||
<span class="ident">buf</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">i</span>..];
|
||
|
||
<span class="comment">// Remember for the next iteration that we wrote these bytes.</span>
|
||
<span class="ident">carryover_bytes_written</span> <span class="op">+</span><span class="op">=</span> <span class="ident">num_bytes_written</span>;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="ident">std::io::Result</span><span class="op"><</span>()<span class="op">></span> {
|
||
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">flush</span>()
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Write a certain number of lines to one file, then move on to another one.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This struct maintains an underlying writer representing the</span>
|
||
<span class="doccomment">/// current chunk of the output. If a call to [`write`] would cause</span>
|
||
<span class="doccomment">/// the underlying writer to write more than the allowed number of</span>
|
||
<span class="doccomment">/// lines, a new writer is created and the excess lines are written to</span>
|
||
<span class="doccomment">/// that one instead. As many new underlying writers are created as</span>
|
||
<span class="doccomment">/// needed to write all the lines in the input buffer.</span>
|
||
<span class="kw">struct</span> <span class="ident">LineChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="doccomment">/// Parameters for creating the underlying writer for each new chunk.</span>
|
||
<span class="ident">settings</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Settings</span>,
|
||
|
||
<span class="doccomment">/// The maximum number of lines allowed for a single chunk of output.</span>
|
||
<span class="ident">chunk_size</span>: <span class="ident">u64</span>,
|
||
|
||
<span class="doccomment">/// Running total of number of chunks that have been completed.</span>
|
||
<span class="ident">num_chunks_written</span>: <span class="ident">u64</span>,
|
||
|
||
<span class="doccomment">/// Remaining capacity in number of lines in the current chunk.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This number starts at `chunk_size` and decreases as lines are</span>
|
||
<span class="doccomment">/// written. Once it reaches zero, a writer for a new chunk is</span>
|
||
<span class="doccomment">/// initialized and this number gets reset to `chunk_size`.</span>
|
||
<span class="ident">num_lines_remaining_in_current_chunk</span>: <span class="ident">u64</span>,
|
||
|
||
<span class="doccomment">/// The underlying writer for the current chunk.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Once the number of lines written to this writer exceeds</span>
|
||
<span class="doccomment">/// `chunk_size`, a new writer is initialized and assigned to this</span>
|
||
<span class="doccomment">/// field.</span>
|
||
<span class="ident">inner</span>: <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Write</span><span class="op">></span><span class="op">></span>,
|
||
|
||
<span class="doccomment">/// Iterator that yields filenames for each chunk.</span>
|
||
<span class="ident">filename_iterator</span>: <span class="ident">FilenameIterator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">LineChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">chunk_size</span>: <span class="ident">u64</span>, <span class="ident">settings</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Settings</span>) -> <span class="ident">UResult</span><span class="op"><</span><span class="ident">LineChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span> {
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">filename_iterator</span> <span class="op">=</span> <span class="ident">FilenameIterator::new</span>(
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">prefix</span>,
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">additional_suffix</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_length</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_type</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_start</span>,
|
||
)<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">filename</span> <span class="op">=</span> <span class="ident">filename_iterator</span>
|
||
.<span class="ident">next</span>()
|
||
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="string">"output file suffixes exhausted"</span>))<span class="question-mark">?</span>;
|
||
<span class="kw">if</span> <span class="ident">settings</span>.<span class="ident">verbose</span> {
|
||
<span class="macro">println!</span>(<span class="string">"creating file {}"</span>, <span class="ident">filename</span>.<span class="ident">quote</span>());
|
||
}
|
||
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">filename</span>)<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident">LineChunkWriter</span> {
|
||
<span class="ident">settings</span>,
|
||
<span class="ident">chunk_size</span>,
|
||
<span class="ident">num_lines_remaining_in_current_chunk</span>: <span class="ident">chunk_size</span>,
|
||
<span class="ident">num_chunks_written</span>: <span class="number">0</span>,
|
||
<span class="ident">inner</span>,
|
||
<span class="ident">filename_iterator</span>,
|
||
})
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">LineChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) -> <span class="ident">std::io::Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
|
||
<span class="comment">// If the number of lines in `buf` exceeds the number of lines</span>
|
||
<span class="comment">// remaining in the current chunk, we will need to write to</span>
|
||
<span class="comment">// multiple different underlying writers. In that case, each</span>
|
||
<span class="comment">// iteration of this loop writes to the underlying writer that</span>
|
||
<span class="comment">// corresponds to the current chunk number.</span>
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prev</span> <span class="op">=</span> <span class="number">0</span>;
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">total_bytes_written</span> <span class="op">=</span> <span class="number">0</span>;
|
||
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">memchr::memchr_iter</span>(<span class="string">b'\n'</span>, <span class="ident">buf</span>) {
|
||
<span class="comment">// If we have exceeded the number of lines to write in the</span>
|
||
<span class="comment">// current chunk, then start a new chunk and its</span>
|
||
<span class="comment">// corresponding writer.</span>
|
||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">num_lines_remaining_in_current_chunk</span> <span class="op">==</span> <span class="number">0</span> {
|
||
<span class="self">self</span>.<span class="ident">num_chunks_written</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
|
||
<span class="kw">let</span> <span class="ident">filename</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">filename_iterator</span>.<span class="ident">next</span>().<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> {
|
||
<span class="ident">std::io::Error::new</span>(<span class="ident">ErrorKind::Other</span>, <span class="string">"output file suffixes exhausted"</span>)
|
||
})<span class="question-mark">?</span>;
|
||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">verbose</span> {
|
||
<span class="macro">println!</span>(<span class="string">"creating file {}"</span>, <span class="ident">filename</span>.<span class="ident">quote</span>());
|
||
}
|
||
<span class="self">self</span>.<span class="ident">inner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">filename</span>)<span class="question-mark">?</span>;
|
||
<span class="self">self</span>.<span class="ident">num_lines_remaining_in_current_chunk</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">chunk_size</span>;
|
||
}
|
||
|
||
<span class="comment">// Write the line, starting from *after* the previous</span>
|
||
<span class="comment">// newline character and ending *after* the current</span>
|
||
<span class="comment">// newline character.</span>
|
||
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">prev</span>..<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>])<span class="question-mark">?</span>;
|
||
<span class="ident">total_bytes_written</span> <span class="op">+</span><span class="op">=</span> <span class="ident">n</span>;
|
||
<span class="ident">prev</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>;
|
||
<span class="self">self</span>.<span class="ident">num_lines_remaining_in_current_chunk</span> <span class="op">-</span><span class="op">=</span> <span class="number">1</span>;
|
||
}
|
||
|
||
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">prev</span>..<span class="ident">buf</span>.<span class="ident">len</span>()])<span class="question-mark">?</span>;
|
||
<span class="ident">total_bytes_written</span> <span class="op">+</span><span class="op">=</span> <span class="ident">n</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident">total_bytes_written</span>)
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="ident">std::io::Result</span><span class="op"><</span>()<span class="op">></span> {
|
||
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">flush</span>()
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Write lines to each sequential output files, limited by bytes.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This struct maintains an underlying writer representing the</span>
|
||
<span class="doccomment">/// current chunk of the output. On each call to [`write`], it writes</span>
|
||
<span class="doccomment">/// as many lines as possible to the current chunk without exceeding</span>
|
||
<span class="doccomment">/// the specified byte limit. If a single line has more bytes than the</span>
|
||
<span class="doccomment">/// limit, then fill an entire single chunk with those bytes and</span>
|
||
<span class="doccomment">/// handle the remainder of the line as if it were its own distinct</span>
|
||
<span class="doccomment">/// line. As many new underlying writers are created as needed to</span>
|
||
<span class="doccomment">/// write all the data in the input buffer.</span>
|
||
<span class="kw">struct</span> <span class="ident">LineBytesChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="doccomment">/// Parameters for creating the underlying writer for each new chunk.</span>
|
||
<span class="ident">settings</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Settings</span>,
|
||
|
||
<span class="doccomment">/// The maximum number of bytes allowed for a single chunk of output.</span>
|
||
<span class="ident">chunk_size</span>: <span class="ident">u64</span>,
|
||
|
||
<span class="doccomment">/// Running total of number of chunks that have been completed.</span>
|
||
<span class="ident">num_chunks_written</span>: <span class="ident">usize</span>,
|
||
|
||
<span class="doccomment">/// Remaining capacity in number of bytes in the current chunk.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This number starts at `chunk_size` and decreases as lines are</span>
|
||
<span class="doccomment">/// written. Once it reaches zero, a writer for a new chunk is</span>
|
||
<span class="doccomment">/// initialized and this number gets reset to `chunk_size`.</span>
|
||
<span class="ident">num_bytes_remaining_in_current_chunk</span>: <span class="ident">usize</span>,
|
||
|
||
<span class="doccomment">/// The underlying writer for the current chunk.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Once the number of bytes written to this writer exceeds</span>
|
||
<span class="doccomment">/// `chunk_size`, a new writer is initialized and assigned to this</span>
|
||
<span class="doccomment">/// field.</span>
|
||
<span class="ident">inner</span>: <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Write</span><span class="op">></span><span class="op">></span>,
|
||
|
||
<span class="doccomment">/// Iterator that yields filenames for each chunk.</span>
|
||
<span class="ident">filename_iterator</span>: <span class="ident">FilenameIterator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">LineBytesChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">chunk_size</span>: <span class="ident">u64</span>, <span class="ident">settings</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Settings</span>) -> <span class="ident">UResult</span><span class="op"><</span><span class="ident">LineBytesChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span> {
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">filename_iterator</span> <span class="op">=</span> <span class="ident">FilenameIterator::new</span>(
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">prefix</span>,
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">additional_suffix</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_length</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_type</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_start</span>,
|
||
)<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">filename</span> <span class="op">=</span> <span class="ident">filename_iterator</span>
|
||
.<span class="ident">next</span>()
|
||
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="string">"output file suffixes exhausted"</span>))<span class="question-mark">?</span>;
|
||
<span class="kw">if</span> <span class="ident">settings</span>.<span class="ident">verbose</span> {
|
||
<span class="macro">println!</span>(<span class="string">"creating file {}"</span>, <span class="ident">filename</span>.<span class="ident">quote</span>());
|
||
}
|
||
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">filename</span>)<span class="question-mark">?</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="ident">LineBytesChunkWriter</span> {
|
||
<span class="ident">settings</span>,
|
||
<span class="ident">chunk_size</span>,
|
||
<span class="ident">num_bytes_remaining_in_current_chunk</span>: <span class="ident">usize::try_from</span>(<span class="ident">chunk_size</span>).<span class="ident">unwrap</span>(),
|
||
<span class="ident">num_chunks_written</span>: <span class="number">0</span>,
|
||
<span class="ident">inner</span>,
|
||
<span class="ident">filename_iterator</span>,
|
||
})
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">LineBytesChunkWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="doccomment">/// Write as many lines to a chunk as possible without</span>
|
||
<span class="doccomment">/// exceeding the byte limit. If a single line has more bytes</span>
|
||
<span class="doccomment">/// than the limit, then fill an entire single chunk with those</span>
|
||
<span class="doccomment">/// bytes and handle the remainder of the line as if it were</span>
|
||
<span class="doccomment">/// its own distinct line.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// For example: if the `chunk_size` is 8 and the input is:</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```text</span>
|
||
<span class="doccomment">/// aaaaaaaaa\nbbbb\ncccc\ndd\nee\n</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// then the output gets broken into chunks like this:</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```text</span>
|
||
<span class="doccomment">/// chunk 0 chunk 1 chunk 2 chunk 3</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// 0 1 2</span>
|
||
<span class="doccomment">/// 01234567 89 01234 56789 012 345 6</span>
|
||
<span class="doccomment">/// |------| |-------| |--------| |---|</span>
|
||
<span class="doccomment">/// aaaaaaaa a\nbbbb\n cccc\ndd\n ee\n</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) -> <span class="ident">std::io::Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
|
||
<span class="comment">// The total number of bytes written during the loop below.</span>
|
||
<span class="comment">//</span>
|
||
<span class="comment">// It is necessary to keep this running total because we may</span>
|
||
<span class="comment">// be making multiple calls to `write()` on multiple different</span>
|
||
<span class="comment">// underlying writers and we want the final reported number of</span>
|
||
<span class="comment">// bytes written to reflect the total number of bytes written</span>
|
||
<span class="comment">// to all of the underlying writers.</span>
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">total_bytes_written</span> <span class="op">=</span> <span class="number">0</span>;
|
||
|
||
<span class="comment">// Loop until we have written all bytes in the input buffer</span>
|
||
<span class="comment">// (or an IO error occurs).</span>
|
||
<span class="kw">loop</span> {
|
||
<span class="comment">// If the buffer is empty, then we are done writing.</span>
|
||
<span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">is_empty</span>() {
|
||
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">total_bytes_written</span>);
|
||
}
|
||
|
||
<span class="comment">// If we have filled the current chunk with bytes, then</span>
|
||
<span class="comment">// start a new chunk and initialize its corresponding</span>
|
||
<span class="comment">// writer.</span>
|
||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">==</span> <span class="number">0</span> {
|
||
<span class="self">self</span>.<span class="ident">num_chunks_written</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
|
||
<span class="kw">let</span> <span class="ident">filename</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">filename_iterator</span>.<span class="ident">next</span>().<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> {
|
||
<span class="ident">std::io::Error::new</span>(<span class="ident">ErrorKind::Other</span>, <span class="string">"output file suffixes exhausted"</span>)
|
||
})<span class="question-mark">?</span>;
|
||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">verbose</span> {
|
||
<span class="macro">println!</span>(<span class="string">"creating file {}"</span>, <span class="ident">filename</span>.<span class="ident">quote</span>());
|
||
}
|
||
<span class="self">self</span>.<span class="ident">inner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">filename</span>)<span class="question-mark">?</span>;
|
||
<span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">chunk_size</span>.<span class="ident">try_into</span>().<span class="ident">unwrap</span>();
|
||
}
|
||
|
||
<span class="comment">// Find the first newline character in the buffer.</span>
|
||
<span class="kw">match</span> <span class="ident">memchr::memchr</span>(<span class="string">b'\n'</span>, <span class="ident">buf</span>) {
|
||
<span class="comment">// If there is no newline character and the buffer is</span>
|
||
<span class="comment">// not empty, then write as many bytes as we can and</span>
|
||
<span class="comment">// then move on to the next chunk if necessary.</span>
|
||
<span class="prelude-val">None</span> => {
|
||
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span>;
|
||
<span class="kw">let</span> <span class="ident">num_bytes_written</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..<span class="ident">end</span>.<span class="ident">min</span>(<span class="ident">buf</span>.<span class="ident">len</span>())])<span class="question-mark">?</span>;
|
||
<span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">-</span><span class="op">=</span> <span class="ident">num_bytes_written</span>;
|
||
<span class="ident">total_bytes_written</span> <span class="op">+</span><span class="op">=</span> <span class="ident">num_bytes_written</span>;
|
||
<span class="ident">buf</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">num_bytes_written</span>..];
|
||
}
|
||
|
||
<span class="comment">// If there is a newline character and the line</span>
|
||
<span class="comment">// (including the newline character) will fit in the</span>
|
||
<span class="comment">// current chunk, then write the entire line and</span>
|
||
<span class="comment">// continue to the next iteration. (See chunk 1 in the</span>
|
||
<span class="comment">// example comment above.)</span>
|
||
<span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="kw">if</span> <span class="ident">i</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> => {
|
||
<span class="kw">let</span> <span class="ident">num_bytes_written</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>])<span class="question-mark">?</span>;
|
||
<span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">-</span><span class="op">=</span> <span class="ident">num_bytes_written</span>;
|
||
<span class="ident">total_bytes_written</span> <span class="op">+</span><span class="op">=</span> <span class="ident">num_bytes_written</span>;
|
||
<span class="ident">buf</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">num_bytes_written</span>..];
|
||
}
|
||
|
||
<span class="comment">// If there is a newline character, the line</span>
|
||
<span class="comment">// (including the newline character) will not fit in</span>
|
||
<span class="comment">// the current chunk, *and* no other lines have been</span>
|
||
<span class="comment">// written to the current chunk, then write as many</span>
|
||
<span class="comment">// bytes as we can and continue to the next</span>
|
||
<span class="comment">// iteration. (See chunk 0 in the example comment</span>
|
||
<span class="comment">// above.)</span>
|
||
<span class="prelude-val">Some</span>(<span class="kw">_</span>)
|
||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span>
|
||
<span class="op">==</span> <span class="self">self</span>.<span class="ident">chunk_size</span>.<span class="ident">try_into</span>().<span class="ident">unwrap</span>() =>
|
||
{
|
||
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span>;
|
||
<span class="kw">let</span> <span class="ident">num_bytes_written</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..<span class="ident">end</span>])<span class="question-mark">?</span>;
|
||
<span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">-</span><span class="op">=</span> <span class="ident">num_bytes_written</span>;
|
||
<span class="ident">total_bytes_written</span> <span class="op">+</span><span class="op">=</span> <span class="ident">num_bytes_written</span>;
|
||
<span class="ident">buf</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">num_bytes_written</span>..];
|
||
}
|
||
|
||
<span class="comment">// If there is a newline character, the line</span>
|
||
<span class="comment">// (including the newline character) will not fit in</span>
|
||
<span class="comment">// the current chunk, and at least one other line has</span>
|
||
<span class="comment">// been written to the current chunk, then signal to</span>
|
||
<span class="comment">// the next iteration that a new chunk needs to be</span>
|
||
<span class="comment">// created and continue to the next iteration of the</span>
|
||
<span class="comment">// loop to try writing the line there.</span>
|
||
<span class="prelude-val">Some</span>(<span class="kw">_</span>) => {
|
||
<span class="self">self</span>.<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">=</span> <span class="number">0</span>;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="ident">std::io::Result</span><span class="op"><</span>()<span class="op">></span> {
|
||
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">flush</span>()
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Split a file into a specific number of chunks by byte.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This function always creates one output file for each chunk, even</span>
|
||
<span class="doccomment">/// if there is an error reading or writing one of the chunks or if</span>
|
||
<span class="doccomment">/// the input file is truncated. However, if the `filter` option is</span>
|
||
<span class="doccomment">/// being used, then no files are created.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Errors</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This function returns an error if there is a problem reading from</span>
|
||
<span class="doccomment">/// `reader` or writing to one of the output files.</span>
|
||
<span class="kw">fn</span> <span class="ident">split_into_n_chunks_by_byte</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>(
|
||
<span class="ident">settings</span>: <span class="kw-2">&</span><span class="ident">Settings</span>,
|
||
<span class="ident">reader</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>,
|
||
<span class="ident">num_chunks</span>: <span class="ident">u64</span>,
|
||
) -> <span class="ident">UResult</span><span class="op"><</span>()<span class="op">></span>
|
||
<span class="kw">where</span>
|
||
<span class="ident">R</span>: <span class="ident">Read</span>,
|
||
{
|
||
<span class="comment">// Get the size of the input file in bytes and compute the number</span>
|
||
<span class="comment">// of bytes per chunk.</span>
|
||
<span class="comment">//</span>
|
||
<span class="comment">// If the requested number of chunks exceeds the number of bytes</span>
|
||
<span class="comment">// in the file *and* the `elide_empty_files` parameter is enabled,</span>
|
||
<span class="comment">// then behave as if the number of chunks was set to the number of</span>
|
||
<span class="comment">// bytes in the file. This ensures that we don't write empty</span>
|
||
<span class="comment">// files. Otherwise, just write the `num_chunks - num_bytes` empty</span>
|
||
<span class="comment">// files.</span>
|
||
<span class="kw">let</span> <span class="ident">metadata</span> <span class="op">=</span> <span class="ident">metadata</span>(<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">input</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> {
|
||
<span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="macro">format!</span>(<span class="string">"{}: cannot determine file size"</span>, <span class="ident">settings</span>.<span class="ident">input</span>))
|
||
})<span class="question-mark">?</span>;
|
||
|
||
<span class="kw">let</span> <span class="ident">num_bytes</span> <span class="op">=</span> <span class="ident">metadata</span>.<span class="ident">len</span>();
|
||
<span class="kw">let</span> <span class="ident">will_have_empty_files</span> <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">elide_empty_files</span> <span class="op">&&</span> <span class="ident">num_chunks</span> <span class="op">></span> <span class="ident">num_bytes</span>;
|
||
<span class="kw">let</span> (<span class="ident">num_chunks</span>, <span class="ident">chunk_size</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">will_have_empty_files</span> {
|
||
<span class="kw">let</span> <span class="ident">num_chunks</span> <span class="op">=</span> <span class="ident">num_bytes</span>;
|
||
<span class="kw">let</span> <span class="ident">chunk_size</span> <span class="op">=</span> <span class="number">1</span>;
|
||
(<span class="ident">num_chunks</span>, <span class="ident">chunk_size</span>)
|
||
} <span class="kw">else</span> {
|
||
<span class="kw">let</span> <span class="ident">chunk_size</span> <span class="op">=</span> (<span class="ident">num_bytes</span> <span class="op">/</span> (<span class="ident">num_chunks</span>)).<span class="ident">max</span>(<span class="number">1</span>);
|
||
(<span class="ident">num_chunks</span>, <span class="ident">chunk_size</span>)
|
||
};
|
||
|
||
<span class="comment">// If we would have written zero chunks of output, then terminate</span>
|
||
<span class="comment">// immediately. This happens on `split -e -n 3 /dev/null`, for</span>
|
||
<span class="comment">// example.</span>
|
||
<span class="kw">if</span> <span class="ident">num_chunks</span> <span class="op">==</span> <span class="number">0</span> {
|
||
<span class="kw">return</span> <span class="prelude-val">Ok</span>(());
|
||
}
|
||
|
||
<span class="kw">let</span> <span class="ident">num_chunks</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">num_chunks</span>
|
||
.<span class="ident">try_into</span>()
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="string">"Number of chunks too big"</span>))<span class="question-mark">?</span>;
|
||
|
||
<span class="comment">// This object is responsible for creating the filename for each chunk.</span>
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">filename_iterator</span> <span class="op">=</span> <span class="ident">FilenameIterator::new</span>(
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">prefix</span>,
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">additional_suffix</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_length</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_type</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_start</span>,
|
||
)<span class="question-mark">?</span>;
|
||
|
||
<span class="comment">// Create one writer for each chunk. This will create each</span>
|
||
<span class="comment">// of the underlying files (if not in `--filter` mode).</span>
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writers</span> <span class="op">=</span> <span class="macro">vec!</span>[];
|
||
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">num_chunks</span> {
|
||
<span class="kw">let</span> <span class="ident">filename</span> <span class="op">=</span> <span class="ident">filename_iterator</span>
|
||
.<span class="ident">next</span>()
|
||
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="string">"output file suffixes exhausted"</span>))<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">instantiate_current_writer</span>(<span class="ident">filename</span>.<span class="ident">as_str</span>())<span class="question-mark">?</span>;
|
||
<span class="ident">writers</span>.<span class="ident">push</span>(<span class="ident">writer</span>);
|
||
}
|
||
|
||
<span class="comment">// Capture the result of the `std::io::copy()` calls to check for</span>
|
||
<span class="comment">// `BrokenPipe`.</span>
|
||
<span class="kw">let</span> <span class="ident">result</span>: <span class="ident">std::io::Result</span><span class="op"><</span>()<span class="op">></span> <span class="op">=</span> {
|
||
<span class="comment">// Write `chunk_size` bytes from the reader into each writer</span>
|
||
<span class="comment">// except the last.</span>
|
||
<span class="comment">//</span>
|
||
<span class="comment">// The last writer gets all remaining bytes so that if the number</span>
|
||
<span class="comment">// of bytes in the input file was not evenly divisible by</span>
|
||
<span class="comment">// `num_chunks`, we don't leave any bytes behind.</span>
|
||
<span class="kw">for</span> <span class="ident">writer</span> <span class="kw">in</span> <span class="ident">writers</span>.<span class="ident">iter_mut</span>().<span class="ident">take</span>(<span class="ident">num_chunks</span> <span class="op">-</span> <span class="number">1</span>) {
|
||
<span class="ident">io::copy</span>(<span class="kw-2">&mut</span> <span class="ident">reader</span>.<span class="ident">by_ref</span>().<span class="ident">take</span>(<span class="ident">chunk_size</span>), <span class="ident">writer</span>)<span class="question-mark">?</span>;
|
||
}
|
||
|
||
<span class="comment">// Write all the remaining bytes to the last chunk.</span>
|
||
<span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">num_chunks</span> <span class="op">-</span> <span class="number">1</span>;
|
||
<span class="kw">let</span> <span class="ident">last_chunk_size</span> <span class="op">=</span> <span class="ident">num_bytes</span> <span class="op">-</span> (<span class="ident">chunk_size</span> <span class="op">*</span> (<span class="ident">num_chunks</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">-</span> <span class="number">1</span>));
|
||
<span class="ident">io::copy</span>(<span class="kw-2">&mut</span> <span class="ident">reader</span>.<span class="ident">by_ref</span>().<span class="ident">take</span>(<span class="ident">last_chunk_size</span>), <span class="kw-2">&mut</span> <span class="ident">writers</span>[<span class="ident">i</span>])<span class="question-mark">?</span>;
|
||
|
||
<span class="prelude-val">Ok</span>(())
|
||
};
|
||
<span class="kw">match</span> <span class="ident">result</span> {
|
||
<span class="prelude-val">Ok</span>(<span class="kw">_</span>) => <span class="prelude-val">Ok</span>(()),
|
||
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">kind</span>() <span class="op">==</span> <span class="ident">ErrorKind::BrokenPipe</span> => <span class="prelude-val">Ok</span>(()),
|
||
<span class="prelude-val">Err</span>(<span class="ident">e</span>) => <span class="prelude-val">Err</span>(<span class="macro">uio_error!</span>(<span class="ident">e</span>, <span class="string">"input/output error"</span>)),
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Split a file into a specific number of chunks by line.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This function always creates one output file for each chunk, even</span>
|
||
<span class="doccomment">/// if there is an error reading or writing one of the chunks or if</span>
|
||
<span class="doccomment">/// the input file is truncated. However, if the `filter` option is</span>
|
||
<span class="doccomment">/// being used, then no files are created.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Errors</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This function returns an error if there is a problem reading from</span>
|
||
<span class="doccomment">/// `reader` or writing to one of the output files.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # See also</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// * [`kth_chunk_by_line`], which splits its input in the same way,</span>
|
||
<span class="doccomment">/// but writes only one specified chunk to stdout.</span>
|
||
<span class="kw">fn</span> <span class="ident">split_into_n_chunks_by_line</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>(
|
||
<span class="ident">settings</span>: <span class="kw-2">&</span><span class="ident">Settings</span>,
|
||
<span class="ident">reader</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>,
|
||
<span class="ident">num_chunks</span>: <span class="ident">u64</span>,
|
||
) -> <span class="ident">UResult</span><span class="op"><</span>()<span class="op">></span>
|
||
<span class="kw">where</span>
|
||
<span class="ident">R</span>: <span class="ident">BufRead</span>,
|
||
{
|
||
<span class="comment">// Get the size of the input file in bytes and compute the number</span>
|
||
<span class="comment">// of bytes per chunk.</span>
|
||
<span class="kw">let</span> <span class="ident">metadata</span> <span class="op">=</span> <span class="ident">metadata</span>(<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">input</span>).<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">num_bytes</span> <span class="op">=</span> <span class="ident">metadata</span>.<span class="ident">len</span>();
|
||
<span class="kw">let</span> <span class="ident">chunk_size</span> <span class="op">=</span> (<span class="ident">num_bytes</span> <span class="op">/</span> (<span class="ident">num_chunks</span> <span class="kw">as</span> <span class="ident">u64</span>)) <span class="kw">as</span> <span class="ident">usize</span>;
|
||
|
||
<span class="comment">// This object is responsible for creating the filename for each chunk.</span>
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">filename_iterator</span> <span class="op">=</span> <span class="ident">FilenameIterator::new</span>(
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">prefix</span>,
|
||
<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">additional_suffix</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_length</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_type</span>,
|
||
<span class="ident">settings</span>.<span class="ident">suffix_start</span>,
|
||
)<span class="question-mark">?</span>;
|
||
|
||
<span class="comment">// Create one writer for each chunk. This will create each</span>
|
||
<span class="comment">// of the underlying files (if not in `--filter` mode).</span>
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writers</span> <span class="op">=</span> <span class="macro">vec!</span>[];
|
||
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">num_chunks</span> {
|
||
<span class="kw">let</span> <span class="ident">filename</span> <span class="op">=</span> <span class="ident">filename_iterator</span>
|
||
.<span class="ident">next</span>()
|
||
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="string">"output file suffixes exhausted"</span>))<span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">instantiate_current_writer</span>(<span class="ident">filename</span>.<span class="ident">as_str</span>())<span class="question-mark">?</span>;
|
||
<span class="ident">writers</span>.<span class="ident">push</span>(<span class="ident">writer</span>);
|
||
}
|
||
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">=</span> <span class="ident">chunk_size</span>;
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
|
||
<span class="kw">for</span> <span class="ident">line_result</span> <span class="kw">in</span> <span class="ident">reader</span>.<span class="ident">lines</span>() {
|
||
<span class="kw">let</span> <span class="ident">line</span> <span class="op">=</span> <span class="ident">line_result</span>.<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">maybe_writer</span> <span class="op">=</span> <span class="ident">writers</span>.<span class="ident">get_mut</span>(<span class="ident">i</span>);
|
||
<span class="kw">let</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">maybe_writer</span>.<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">line</span>.<span class="ident">as_bytes</span>();
|
||
<span class="ident">writer</span>.<span class="ident">write_all</span>(<span class="ident">bytes</span>)<span class="question-mark">?</span>;
|
||
<span class="ident">writer</span>.<span class="ident">write_all</span>(<span class="string">b"\n"</span>)<span class="question-mark">?</span>;
|
||
|
||
<span class="comment">// Add one byte for the newline character.</span>
|
||
<span class="kw">let</span> <span class="ident">num_bytes</span> <span class="op">=</span> <span class="ident">bytes</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>;
|
||
<span class="kw">if</span> <span class="ident">num_bytes</span> <span class="op">></span> <span class="ident">num_bytes_remaining_in_current_chunk</span> {
|
||
<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">=</span> <span class="ident">chunk_size</span>;
|
||
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
|
||
} <span class="kw">else</span> {
|
||
<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">-</span><span class="op">=</span> <span class="ident">num_bytes</span>;
|
||
}
|
||
}
|
||
|
||
<span class="prelude-val">Ok</span>(())
|
||
}
|
||
|
||
<span class="doccomment">/// Print the k-th chunk of a file, splitting by line.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This function is like [`split_into_n_chunks_by_line`], but instead</span>
|
||
<span class="doccomment">/// of writing each chunk to its own file, it only writes to stdout</span>
|
||
<span class="doccomment">/// the contents of the chunk identified by `chunk_number`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Errors</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This function returns an error if there is a problem reading from</span>
|
||
<span class="doccomment">/// `reader` or writing to one of the output files.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # See also</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// * [`split_into_n_chunks_by_line`], which splits its input in the</span>
|
||
<span class="doccomment">/// same way, but writes each chunk to its own file.</span>
|
||
<span class="kw">fn</span> <span class="ident">kth_chunk_by_line</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>(
|
||
<span class="ident">settings</span>: <span class="kw-2">&</span><span class="ident">Settings</span>,
|
||
<span class="ident">reader</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>,
|
||
<span class="ident">chunk_number</span>: <span class="ident">u64</span>,
|
||
<span class="ident">num_chunks</span>: <span class="ident">u64</span>,
|
||
) -> <span class="ident">UResult</span><span class="op"><</span>()<span class="op">></span>
|
||
<span class="kw">where</span>
|
||
<span class="ident">R</span>: <span class="ident">BufRead</span>,
|
||
{
|
||
<span class="comment">// Get the size of the input file in bytes and compute the number</span>
|
||
<span class="comment">// of bytes per chunk.</span>
|
||
<span class="kw">let</span> <span class="ident">metadata</span> <span class="op">=</span> <span class="ident">metadata</span>(<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">input</span>).<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">num_bytes</span> <span class="op">=</span> <span class="ident">metadata</span>.<span class="ident">len</span>();
|
||
<span class="kw">let</span> <span class="ident">chunk_size</span> <span class="op">=</span> (<span class="ident">num_bytes</span> <span class="op">/</span> (<span class="ident">num_chunks</span> <span class="kw">as</span> <span class="ident">u64</span>)) <span class="kw">as</span> <span class="ident">usize</span>;
|
||
|
||
<span class="comment">// Write to stdout instead of to a file.</span>
|
||
<span class="kw">let</span> <span class="ident">stdout</span> <span class="op">=</span> <span class="ident">std::io::stdout</span>();
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">stdout</span>.<span class="ident">lock</span>();
|
||
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">=</span> <span class="ident">chunk_size</span>;
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
|
||
<span class="kw">for</span> <span class="ident">line_result</span> <span class="kw">in</span> <span class="ident">reader</span>.<span class="ident">lines</span>() {
|
||
<span class="kw">let</span> <span class="ident">line</span> <span class="op">=</span> <span class="ident">line_result</span><span class="question-mark">?</span>;
|
||
<span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">line</span>.<span class="ident">as_bytes</span>();
|
||
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="ident">chunk_number</span> {
|
||
<span class="ident">writer</span>.<span class="ident">write_all</span>(<span class="ident">bytes</span>)<span class="question-mark">?</span>;
|
||
<span class="ident">writer</span>.<span class="ident">write_all</span>(<span class="string">b"\n"</span>)<span class="question-mark">?</span>;
|
||
}
|
||
|
||
<span class="comment">// Add one byte for the newline character.</span>
|
||
<span class="kw">let</span> <span class="ident">num_bytes</span> <span class="op">=</span> <span class="ident">bytes</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>;
|
||
<span class="kw">if</span> <span class="ident">num_bytes</span> <span class="op">></span><span class="op">=</span> <span class="ident">num_bytes_remaining_in_current_chunk</span> {
|
||
<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">=</span> <span class="ident">chunk_size</span>;
|
||
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
|
||
} <span class="kw">else</span> {
|
||
<span class="ident">num_bytes_remaining_in_current_chunk</span> <span class="op">-</span><span class="op">=</span> <span class="ident">num_bytes</span>;
|
||
}
|
||
|
||
<span class="kw">if</span> <span class="ident">i</span> <span class="op">></span> <span class="ident">chunk_number</span> {
|
||
<span class="kw">break</span>;
|
||
}
|
||
}
|
||
|
||
<span class="prelude-val">Ok</span>(())
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">split</span>(<span class="ident">settings</span>: <span class="kw-2">&</span><span class="ident">Settings</span>) -> <span class="ident">UResult</span><span class="op"><</span>()<span class="op">></span> {
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader::new</span>(<span class="kw">if</span> <span class="ident">settings</span>.<span class="ident">input</span> <span class="op">==</span> <span class="string">"-"</span> {
|
||
<span class="ident">Box::new</span>(<span class="ident">stdin</span>()) <span class="kw">as</span> <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Read</span><span class="op">></span>
|
||
} <span class="kw">else</span> {
|
||
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">File::open</span>(<span class="ident">Path::new</span>(<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">input</span>)).<span class="ident">map_err_context</span>(<span class="op">|</span><span class="op">|</span> {
|
||
<span class="macro">format!</span>(
|
||
<span class="string">"cannot open {} for reading: No such file or directory"</span>,
|
||
<span class="ident">settings</span>.<span class="ident">input</span>.<span class="ident">quote</span>()
|
||
)
|
||
})<span class="question-mark">?</span>;
|
||
<span class="ident">Box::new</span>(<span class="ident">r</span>) <span class="kw">as</span> <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Read</span><span class="op">></span>
|
||
});
|
||
|
||
<span class="kw">match</span> <span class="ident">settings</span>.<span class="ident">strategy</span> {
|
||
<span class="ident">Strategy::Number</span>(<span class="ident">NumberType::Bytes</span>(<span class="ident">num_chunks</span>)) => {
|
||
<span class="ident">split_into_n_chunks_by_byte</span>(<span class="ident">settings</span>, <span class="kw-2">&mut</span> <span class="ident">reader</span>, <span class="ident">num_chunks</span>)
|
||
}
|
||
<span class="ident">Strategy::Number</span>(<span class="ident">NumberType::Lines</span>(<span class="ident">num_chunks</span>)) => {
|
||
<span class="ident">split_into_n_chunks_by_line</span>(<span class="ident">settings</span>, <span class="kw-2">&mut</span> <span class="ident">reader</span>, <span class="ident">num_chunks</span>)
|
||
}
|
||
<span class="ident">Strategy::Number</span>(<span class="ident">NumberType::KthLines</span>(<span class="ident">chunk_number</span>, <span class="ident">num_chunks</span>)) => {
|
||
<span class="comment">// The chunk number is given as a 1-indexed number, but it</span>
|
||
<span class="comment">// is a little easier to deal with a 0-indexed number.</span>
|
||
<span class="kw">let</span> <span class="ident">chunk_number</span> <span class="op">=</span> <span class="ident">chunk_number</span> <span class="op">-</span> <span class="number">1</span>;
|
||
<span class="ident">kth_chunk_by_line</span>(<span class="ident">settings</span>, <span class="kw-2">&mut</span> <span class="ident">reader</span>, <span class="ident">chunk_number</span>, <span class="ident">num_chunks</span>)
|
||
}
|
||
<span class="ident">Strategy::Number</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(<span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="string">"-n mode not yet fully implemented"</span>)),
|
||
<span class="ident">Strategy::Lines</span>(<span class="ident">chunk_size</span>) => {
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">LineChunkWriter::new</span>(<span class="ident">chunk_size</span>, <span class="ident">settings</span>)<span class="question-mark">?</span>;
|
||
<span class="kw">match</span> <span class="ident">std::io::copy</span>(<span class="kw-2">&mut</span> <span class="ident">reader</span>, <span class="kw-2">&mut</span> <span class="ident">writer</span>) {
|
||
<span class="prelude-val">Ok</span>(<span class="kw">_</span>) => <span class="prelude-val">Ok</span>(()),
|
||
<span class="prelude-val">Err</span>(<span class="ident">e</span>) => <span class="kw">match</span> <span class="ident">e</span>.<span class="ident">kind</span>() {
|
||
<span class="comment">// TODO Since the writer object controls the creation of</span>
|
||
<span class="comment">// new files, we need to rely on the `std::io::Result`</span>
|
||
<span class="comment">// returned by its `write()` method to communicate any</span>
|
||
<span class="comment">// errors to this calling scope. If a new file cannot be</span>
|
||
<span class="comment">// created because we have exceeded the number of</span>
|
||
<span class="comment">// allowable filenames, we use `ErrorKind::Other` to</span>
|
||
<span class="comment">// indicate that. A special error message needs to be</span>
|
||
<span class="comment">// printed in that case.</span>
|
||
<span class="ident">ErrorKind::Other</span> => <span class="prelude-val">Err</span>(<span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="macro">format!</span>(<span class="string">"{}"</span>, <span class="ident">e</span>))),
|
||
<span class="ident">ErrorKind::BrokenPipe</span> => <span class="prelude-val">Ok</span>(()),
|
||
<span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="macro">uio_error!</span>(<span class="ident">e</span>, <span class="string">"input/output error"</span>)),
|
||
},
|
||
}
|
||
}
|
||
<span class="ident">Strategy::Bytes</span>(<span class="ident">chunk_size</span>) => {
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">ByteChunkWriter::new</span>(<span class="ident">chunk_size</span>, <span class="ident">settings</span>)<span class="question-mark">?</span>;
|
||
<span class="kw">match</span> <span class="ident">std::io::copy</span>(<span class="kw-2">&mut</span> <span class="ident">reader</span>, <span class="kw-2">&mut</span> <span class="ident">writer</span>) {
|
||
<span class="prelude-val">Ok</span>(<span class="kw">_</span>) => <span class="prelude-val">Ok</span>(()),
|
||
<span class="prelude-val">Err</span>(<span class="ident">e</span>) => <span class="kw">match</span> <span class="ident">e</span>.<span class="ident">kind</span>() {
|
||
<span class="comment">// TODO Since the writer object controls the creation of</span>
|
||
<span class="comment">// new files, we need to rely on the `std::io::Result`</span>
|
||
<span class="comment">// returned by its `write()` method to communicate any</span>
|
||
<span class="comment">// errors to this calling scope. If a new file cannot be</span>
|
||
<span class="comment">// created because we have exceeded the number of</span>
|
||
<span class="comment">// allowable filenames, we use `ErrorKind::Other` to</span>
|
||
<span class="comment">// indicate that. A special error message needs to be</span>
|
||
<span class="comment">// printed in that case.</span>
|
||
<span class="ident">ErrorKind::Other</span> => <span class="prelude-val">Err</span>(<span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="macro">format!</span>(<span class="string">"{}"</span>, <span class="ident">e</span>))),
|
||
<span class="ident">ErrorKind::BrokenPipe</span> => <span class="prelude-val">Ok</span>(()),
|
||
<span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="macro">uio_error!</span>(<span class="ident">e</span>, <span class="string">"input/output error"</span>)),
|
||
},
|
||
}
|
||
}
|
||
<span class="ident">Strategy::LineBytes</span>(<span class="ident">chunk_size</span>) => {
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">LineBytesChunkWriter::new</span>(<span class="ident">chunk_size</span>, <span class="ident">settings</span>)<span class="question-mark">?</span>;
|
||
<span class="kw">match</span> <span class="ident">std::io::copy</span>(<span class="kw-2">&mut</span> <span class="ident">reader</span>, <span class="kw-2">&mut</span> <span class="ident">writer</span>) {
|
||
<span class="prelude-val">Ok</span>(<span class="kw">_</span>) => <span class="prelude-val">Ok</span>(()),
|
||
<span class="prelude-val">Err</span>(<span class="ident">e</span>) => <span class="kw">match</span> <span class="ident">e</span>.<span class="ident">kind</span>() {
|
||
<span class="comment">// TODO Since the writer object controls the creation of</span>
|
||
<span class="comment">// new files, we need to rely on the `std::io::Result`</span>
|
||
<span class="comment">// returned by its `write()` method to communicate any</span>
|
||
<span class="comment">// errors to this calling scope. If a new file cannot be</span>
|
||
<span class="comment">// created because we have exceeded the number of</span>
|
||
<span class="comment">// allowable filenames, we use `ErrorKind::Other` to</span>
|
||
<span class="comment">// indicate that. A special error message needs to be</span>
|
||
<span class="comment">// printed in that case.</span>
|
||
<span class="ident">ErrorKind::Other</span> => <span class="prelude-val">Err</span>(<span class="ident">USimpleError::new</span>(<span class="number">1</span>, <span class="macro">format!</span>(<span class="string">"{}"</span>, <span class="ident">e</span>))),
|
||
<span class="ident">ErrorKind::BrokenPipe</span> => <span class="prelude-val">Ok</span>(()),
|
||
<span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="macro">uio_error!</span>(<span class="ident">e</span>, <span class="string">"input/output error"</span>)),
|
||
},
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
|
||
<span class="kw">mod</span> <span class="ident">tests</span> {
|
||
|
||
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::NumberType</span>;
|
||
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::NumberTypeError</span>;
|
||
|
||
<span class="attribute">#[<span class="ident">test</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">test_number_type_from</span>() {
|
||
<span class="macro">assert_eq!</span>(<span class="ident">NumberType::from</span>(<span class="string">"123"</span>).<span class="ident">unwrap</span>(), <span class="ident">NumberType::Bytes</span>(<span class="number">123</span>));
|
||
<span class="macro">assert_eq!</span>(<span class="ident">NumberType::from</span>(<span class="string">"l/123"</span>).<span class="ident">unwrap</span>(), <span class="ident">NumberType::Lines</span>(<span class="number">123</span>));
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"l/123/456"</span>).<span class="ident">unwrap</span>(),
|
||
<span class="ident">NumberType::KthLines</span>(<span class="number">123</span>, <span class="number">456</span>)
|
||
);
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"r/123"</span>).<span class="ident">unwrap</span>(),
|
||
<span class="ident">NumberType::RoundRobin</span>(<span class="number">123</span>)
|
||
);
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"r/123/456"</span>).<span class="ident">unwrap</span>(),
|
||
<span class="ident">NumberType::KthRoundRobin</span>(<span class="number">123</span>, <span class="number">456</span>)
|
||
);
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">test</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">test_number_type_from_error</span>() {
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"xyz"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="string">"xyz"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"l/xyz"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="string">"xyz"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"l/123/xyz"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="string">"xyz"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"l/abc/456"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::ChunkNumber</span>(<span class="string">"abc"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
<span class="comment">// In GNU split, the number of chunks get precedence:</span>
|
||
<span class="comment">//</span>
|
||
<span class="comment">// $ split -n l/abc/xyz</span>
|
||
<span class="comment">// split: invalid number of chunks: ‘xyz’</span>
|
||
<span class="comment">//</span>
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"l/abc/xyz"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="string">"xyz"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"r/xyz"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="string">"xyz"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"r/123/xyz"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="string">"xyz"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"r/abc/456"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::ChunkNumber</span>(<span class="string">"abc"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
<span class="comment">// In GNU split, the number of chunks get precedence:</span>
|
||
<span class="comment">//</span>
|
||
<span class="comment">// $ split -n r/abc/xyz</span>
|
||
<span class="comment">// split: invalid number of chunks: ‘xyz’</span>
|
||
<span class="comment">//</span>
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="ident">NumberType::from</span>(<span class="string">"r/abc/xyz"</span>).<span class="ident">unwrap_err</span>(),
|
||
<span class="ident">NumberTypeError::NumberOfChunks</span>(<span class="string">"xyz"</span>.<span class="ident">to_string</span>())
|
||
);
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">test</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">test_number_type_num_chunks</span>() {
|
||
<span class="macro">assert_eq!</span>(<span class="ident">NumberType::from</span>(<span class="string">"123"</span>).<span class="ident">unwrap</span>().<span class="ident">num_chunks</span>(), <span class="number">123</span>);
|
||
<span class="macro">assert_eq!</span>(<span class="ident">NumberType::from</span>(<span class="string">"l/123"</span>).<span class="ident">unwrap</span>().<span class="ident">num_chunks</span>(), <span class="number">123</span>);
|
||
<span class="macro">assert_eq!</span>(<span class="ident">NumberType::from</span>(<span class="string">"l/123/456"</span>).<span class="ident">unwrap</span>().<span class="ident">num_chunks</span>(), <span class="number">456</span>);
|
||
<span class="macro">assert_eq!</span>(<span class="ident">NumberType::from</span>(<span class="string">"r/123"</span>).<span class="ident">unwrap</span>().<span class="ident">num_chunks</span>(), <span class="number">123</span>);
|
||
<span class="macro">assert_eq!</span>(<span class="ident">NumberType::from</span>(<span class="string">"r/123/456"</span>).<span class="ident">unwrap</span>().<span class="ident">num_chunks</span>(), <span class="number">456</span>);
|
||
}
|
||
}
|
||
</code></pre></div>
|
||
</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="uu_split" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html> |