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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="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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script>
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<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"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></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="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../uu_split/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main" 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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|
||
<span id="700">700</span>
|
||
<span id="701">701</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</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">clap</span>::{<span class="ident">crate_version</span>, <span class="ident">App</span>, <span class="ident">AppSettings</span>, <span class="ident">Arg</span>, <span class="ident">ArgMatches</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="ident">stdin</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::num::ParseIntError</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::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_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="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">fn</span> <span class="ident">usage</span>() -> <span class="ident">String</span> {
|
||
<span class="macro">format!</span>(
|
||
<span class="string">"{0} [OPTION]... [INPUT [PREFIX]]"</span>,
|
||
<span class="ident">uucore::execution_phrase</span>()
|
||
)
|
||
}
|
||
<span class="kw">fn</span> <span class="ident">get_long_usage</span>() -> <span class="ident">String</span> {
|
||
<span class="macro">format!</span>(
|
||
<span class="string">"Usage:
|
||
{0}
|
||
|
||
Output fixed-size pieces of INPUT to PREFIXaa, PREFIX ab, ...; default
|
||
size is 1000, and default PREFIX is 'x'. With no INPUT, or when INPUT is
|
||
-, read standard input."</span>,
|
||
<span class="ident">usage</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">usage</span> <span class="op">=</span> <span class="ident">usage</span>();
|
||
<span class="kw">let</span> <span class="ident">long_usage</span> <span class="op">=</span> <span class="ident">get_long_usage</span>();
|
||
<span class="kw">let</span> <span class="ident">matches</span> <span class="op">=</span> <span class="ident">uu_app</span>()
|
||
.<span class="ident">override_usage</span>(<span class="kw-2">&</span><span class="ident">usage</span>[..])
|
||
.<span class="ident">after_help</span>(<span class="kw-2">&</span><span class="ident">long_usage</span>[..])
|
||
.<span class="ident">get_matches_from</span>(<span class="ident">args</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">App</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
|
||
<span class="ident">App::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">setting</span>(<span class="ident">AppSettings::InferLongArgs</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">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">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">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">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">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">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_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">default_value</span>(<span class="ident">OPT_DEFAULT_SUFFIX_LENGTH</span>)
|
||
.<span class="ident">help</span>(<span class="string">"use suffixes of length N (default 2)"</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">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">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">/// 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">usize</span>),
|
||
|
||
<span class="doccomment">/// Each chunk has the specified number of bytes.</span>
|
||
<span class="ident">Bytes</span>(<span class="ident">usize</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">usize</span>),
|
||
|
||
<span class="doccomment">/// Split the file into this many chunks.</span>
|
||
<span class="ident">Number</span>(<span class="ident">usize</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 of chunks.</span>
|
||
<span class="ident">NumberOfChunks</span>(<span class="ident">ParseIntError</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>::NumberOfChunks</span>(<span class="ident">e</span>) => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"invalid number of chunks: {}"</span>, <span class="ident">e</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">occurrences_of</span>(<span class="ident">OPT_LINES</span>),
|
||
<span class="ident">matches</span>.<span class="ident">occurrences_of</span>(<span class="ident">OPT_BYTES</span>),
|
||
<span class="ident">matches</span>.<span class="ident">occurrences_of</span>(<span class="ident">OPT_LINE_BYTES</span>),
|
||
<span class="ident">matches</span>.<span class="ident">occurrences_of</span>(<span class="ident">OPT_NUMBER</span>),
|
||
) {
|
||
(<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>) => <span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::Lines</span>(<span class="number">1000</span>)),
|
||
(<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>) => {
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">value_of</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="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>) => {
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">value_of</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="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>) => {
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">value_of</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="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>) => {
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">value_of</span>(<span class="ident">OPT_NUMBER</span>).<span class="ident">unwrap</span>();
|
||
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>().<span class="ident">map_err</span>(<span class="ident">StrategyError::NumberOfChunks</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">n</span>))
|
||
}
|
||
<span class="kw">_</span> => <span class="prelude-val">Err</span>(<span class="ident">StrategyError::MultipleWays</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">numeric_suffix</span>: <span class="ident">bool</span>,
|
||
<span class="ident">suffix_length</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">/// 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">SuffixLength</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">/// 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>::SuffixLength</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>::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">value_of</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">suffix_length_str</span> <span class="op">=</span> <span class="ident">matches</span>.<span class="ident">value_of</span>(<span class="ident">OPT_SUFFIX_LENGTH</span>).<span class="ident">unwrap</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::SuffixLength</span>(<span class="ident">suffix_length_str</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>,
|
||
<span class="ident">numeric_suffix</span>: <span class="ident">matches</span>.<span class="ident">occurrences_of</span>(<span class="ident">OPT_NUMERIC_SUFFIXES</span>) <span class="op">></span> <span class="number">0</span>,
|
||
<span class="ident">additional_suffix</span>,
|
||
<span class="ident">verbose</span>: <span class="ident">matches</span>.<span class="ident">occurrences_of</span>(<span class="string">"verbose"</span>) <span class="op">></span> <span class="number">0</span>,
|
||
<span class="ident">strategy</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="ident">input</span>: <span class="ident">matches</span>.<span class="ident">value_of</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">value_of</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">value_of</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="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="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">usize</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 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">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">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">usize</span>, <span class="ident">settings</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Settings</span>) -> <span class="prelude-ty">Option</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">numeric_suffix</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="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">platform::instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">filter</span>, <span class="kw-2">&</span><span class="ident">filename</span>);
|
||
<span class="prelude-val">Some</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="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="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="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">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="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">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="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="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">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">// Increment the chunk number, reset the number of</span>
|
||
<span class="comment">// bytes remaining, and instantiate the new</span>
|
||
<span class="comment">// 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">// 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="comment">// Only create the writer for the next chunk if</span>
|
||
<span class="comment">// there are any remaining bytes to write. This</span>
|
||
<span class="comment">// check prevents us from creating a new empty</span>
|
||
<span class="comment">// file.</span>
|
||
<span class="kw">if</span> <span class="op">!</span><span class="ident">buf</span>.<span class="ident">is_empty</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="ident">platform::instantiate_current_writer</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">filter</span>, <span class="kw-2">&</span><span class="ident">filename</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">usize</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 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">usize</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">usize</span>, <span class="ident">settings</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Settings</span>) -> <span class="prelude-ty">Option</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">numeric_suffix</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="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">platform::instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">filter</span>, <span class="kw-2">&</span><span class="ident">filename</span>);
|
||
<span class="prelude-val">Some</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="ident">platform::instantiate_current_writer</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">settings</span>.<span class="ident">filter</span>, <span class="kw-2">&</span><span class="ident">filename</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">/// 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">usize</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="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">numeric_suffix</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">platform::instantiate_current_writer</span>(<span class="kw-2">&</span><span class="ident">settings</span>.<span class="ident">filter</span>, <span class="ident">filename</span>.<span class="ident">as_str</span>());
|
||
<span class="ident">writers</span>.<span class="ident">push</span>(<span class="ident">writer</span>);
|
||
}
|
||
|
||
<span class="comment">// This block evaluates to an object of type `std::io::Result<()>`.</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">// Re-use the buffer to avoid re-allocating a `Vec` on each</span>
|
||
<span class="comment">// iteration. The contents will be completely overwritten each</span>
|
||
<span class="comment">// time we call `read_exact()`.</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">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="macro">vec!</span>[<span class="number">0u8</span>; <span class="ident">chunk_size</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">reader</span>.<span class="ident">read_exact</span>(<span class="kw-2">&mut</span> <span class="ident">buf</span>)<span class="question-mark">?</span>;
|
||
<span class="ident">writer</span>.<span class="ident">write_all</span>(<span class="kw-2">&</span><span class="ident">buf</span>)<span class="question-mark">?</span>;
|
||
}
|
||
|
||
<span class="comment">// Write all the remaining bytes to the last chunk.</span>
|
||
<span class="comment">//</span>
|
||
<span class="comment">// To do this, we resize our buffer to have the necessary number</span>
|
||
<span class="comment">// of bytes.</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="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> (<span class="ident">chunk_size</span> <span class="op">*</span> (<span class="ident">num_chunks</span> <span class="op">-</span> <span class="number">1</span>));
|
||
<span class="ident">buf</span>.<span class="ident">resize</span>(<span class="ident">last_chunk_size</span>, <span class="number">0</span>);
|
||
|
||
<span class="ident">reader</span>.<span class="ident">read_exact</span>(<span class="kw-2">&mut</span> <span class="ident">buf</span>)<span class="question-mark">?</span>;
|
||
<span class="ident">writers</span>[<span class="ident">i</span>].<span class="ident">write_all</span>(<span class="kw-2">&</span><span class="ident">buf</span>)<span class="question-mark">?</span>;
|
||
|
||
<span class="prelude-val">Ok</span>(())
|
||
}
|
||
.<span class="ident">map_err_context</span>(<span class="op">|</span><span class="op">|</span> <span class="string">"I/O error"</span>.<span class="ident">to_string</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">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::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="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">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="string">"output file suffixes exhausted"</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="op">|</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">ByteChunkWriter::new</span>(<span class="ident">chunk_size</span>, <span class="ident">settings</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">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="string">"output file suffixes exhausted"</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>)),
|
||
},
|
||
}
|
||
}
|
||
}
|
||
}
|
||
</code></pre></div>
|
||
</section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="uu_split" data-search-index-js="../../search-index.js" data-search-js="../../search.js"></div>
|
||
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