mirror of
https://github.com/uutils/diffutils.git
synced 2026-06-10 15:48:59 -07:00
Gustavo Noronha Silva
72c7802f06
This is in preparation for adding the other diffutils commands, cmp, diff3, sdiff. We use a similar strategy to uutils/coreutils, with the single binary acting as one of the supported tools if called through a symlink with the appropriate name. When using the multi-tool binary directly, the utility needds to be the first parameter.
885 lines
26 KiB
Rust
885 lines
26 KiB
Rust
use std::ffi::OsString;
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use std::iter::Peekable;
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use std::path::PathBuf;
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use regex::Regex;
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#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
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pub enum Format {
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#[default]
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Normal,
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Unified,
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Context,
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Ed,
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}
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#[derive(Clone, Debug, Eq, PartialEq)]
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pub struct Params {
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pub executable: OsString,
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pub from: OsString,
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pub to: OsString,
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pub format: Format,
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pub context_count: usize,
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pub report_identical_files: bool,
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pub brief: bool,
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pub expand_tabs: bool,
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pub tabsize: usize,
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}
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impl Default for Params {
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fn default() -> Self {
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Self {
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executable: OsString::default(),
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from: OsString::default(),
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to: OsString::default(),
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format: Format::default(),
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context_count: 3,
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report_identical_files: false,
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brief: false,
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expand_tabs: false,
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tabsize: 8,
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}
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}
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}
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pub fn parse_params<I: Iterator<Item = OsString>>(mut opts: Peekable<I>) -> Result<Params, String> {
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// parse CLI
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let Some(executable) = opts.next() else {
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return Err("Usage: <exe> <from> <to>".to_string());
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};
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let mut params = Params {
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executable,
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..Default::default()
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};
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let mut from = None;
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let mut to = None;
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let mut format = None;
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let mut context = None;
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let tabsize_re = Regex::new(r"^--tabsize=(?<num>\d+)$").unwrap();
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while let Some(param) = opts.next() {
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let next_param = opts.peek();
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if param == "--" {
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break;
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}
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if param == "-" {
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if from.is_none() {
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from = Some(param);
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} else if to.is_none() {
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to = Some(param);
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} else {
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return Err(format!(
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"Usage: {} <from> <to>",
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params.executable.to_string_lossy()
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));
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}
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continue;
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}
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if param == "-s" || param == "--report-identical-files" {
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params.report_identical_files = true;
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continue;
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}
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if param == "-q" || param == "--brief" {
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params.brief = true;
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continue;
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}
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if param == "-t" || param == "--expand-tabs" {
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params.expand_tabs = true;
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continue;
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}
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if param == "--normal" {
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if format.is_some() && format != Some(Format::Normal) {
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return Err("Conflicting output style options".to_string());
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}
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format = Some(Format::Normal);
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continue;
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}
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if param == "-e" || param == "--ed" {
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if format.is_some() && format != Some(Format::Ed) {
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return Err("Conflicting output style options".to_string());
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}
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format = Some(Format::Ed);
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continue;
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}
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if tabsize_re.is_match(param.to_string_lossy().as_ref()) {
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// Because param matches the regular expression,
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// it is safe to assume it is valid UTF-8.
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let param = param.into_string().unwrap();
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let tabsize_str = tabsize_re
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.captures(param.as_str())
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.unwrap()
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.name("num")
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.unwrap()
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.as_str();
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params.tabsize = match tabsize_str.parse::<usize>() {
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Ok(num) => num,
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Err(_) => return Err(format!("invalid tabsize «{tabsize_str}»")),
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};
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continue;
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}
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match match_context_diff_params(¶m, next_param, format) {
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Ok(DiffStyleMatch {
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is_match,
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context_count,
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next_param_consumed,
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}) => {
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if is_match {
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format = Some(Format::Context);
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if context_count.is_some() {
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context = context_count;
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}
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if next_param_consumed {
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opts.next();
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}
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continue;
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}
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}
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Err(error) => return Err(error),
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}
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match match_unified_diff_params(¶m, next_param, format) {
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Ok(DiffStyleMatch {
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is_match,
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context_count,
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next_param_consumed,
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}) => {
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if is_match {
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format = Some(Format::Unified);
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if context_count.is_some() {
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context = context_count;
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}
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if next_param_consumed {
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opts.next();
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}
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continue;
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}
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}
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Err(error) => return Err(error),
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}
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if param.to_string_lossy().starts_with('-') {
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return Err(format!("Unknown option: {:?}", param));
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}
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if from.is_none() {
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from = Some(param);
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} else if to.is_none() {
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to = Some(param);
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} else {
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return Err(format!(
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"Usage: {} <from> <to>",
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params.executable.to_string_lossy()
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));
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}
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}
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params.from = if let Some(from) = from {
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from
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} else if let Some(param) = opts.next() {
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param
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} else {
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return Err(format!(
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"Usage: {} <from> <to>",
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params.executable.to_string_lossy()
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));
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};
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params.to = if let Some(to) = to {
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to
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} else if let Some(param) = opts.next() {
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param
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} else {
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return Err(format!(
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"Usage: {} <from> <to>",
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params.executable.to_string_lossy()
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));
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};
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// diff DIRECTORY FILE => diff DIRECTORY/FILE FILE
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// diff FILE DIRECTORY => diff FILE DIRECTORY/FILE
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let mut from_path: PathBuf = PathBuf::from(¶ms.from);
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let mut to_path: PathBuf = PathBuf::from(¶ms.to);
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if from_path.is_dir() && to_path.is_file() {
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from_path.push(to_path.file_name().unwrap());
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params.from = from_path.into_os_string();
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} else if from_path.is_file() && to_path.is_dir() {
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to_path.push(from_path.file_name().unwrap());
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params.to = to_path.into_os_string();
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}
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params.format = format.unwrap_or(Format::default());
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if let Some(context_count) = context {
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params.context_count = context_count;
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}
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Ok(params)
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}
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struct DiffStyleMatch {
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is_match: bool,
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context_count: Option<usize>,
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next_param_consumed: bool,
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}
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fn match_context_diff_params(
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param: &OsString,
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next_param: Option<&OsString>,
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format: Option<Format>,
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) -> Result<DiffStyleMatch, String> {
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const CONTEXT_RE: &str = r"^(-[cC](?<num1>\d*)|--context(=(?<num2>\d*))?|-(?<num3>\d+)c)$";
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let regex = Regex::new(CONTEXT_RE).unwrap();
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let is_match = regex.is_match(param.to_string_lossy().as_ref());
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let mut context_count = None;
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let mut next_param_consumed = false;
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if is_match {
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if format.is_some() && format != Some(Format::Context) {
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return Err("Conflicting output style options".to_string());
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}
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let captures = regex.captures(param.to_str().unwrap()).unwrap();
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let num = captures
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.name("num1")
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.or(captures.name("num2"))
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.or(captures.name("num3"));
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if let Some(numvalue) = num {
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if !numvalue.as_str().is_empty() {
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context_count = Some(numvalue.as_str().parse::<usize>().unwrap());
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}
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}
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if param == "-C" && next_param.is_some() {
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match next_param.unwrap().to_string_lossy().parse::<usize>() {
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Ok(context_size) => {
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context_count = Some(context_size);
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next_param_consumed = true;
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}
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Err(_) => {
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return Err(format!(
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"invalid context length '{}'",
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next_param.unwrap().to_string_lossy()
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))
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}
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}
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}
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}
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Ok(DiffStyleMatch {
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is_match,
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context_count,
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next_param_consumed,
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})
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}
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fn match_unified_diff_params(
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param: &OsString,
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next_param: Option<&OsString>,
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format: Option<Format>,
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) -> Result<DiffStyleMatch, String> {
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const UNIFIED_RE: &str = r"^(-[uU](?<num1>\d*)|--unified(=(?<num2>\d*))?|-(?<num3>\d+)u)$";
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let regex = Regex::new(UNIFIED_RE).unwrap();
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let is_match = regex.is_match(param.to_string_lossy().as_ref());
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let mut context_count = None;
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let mut next_param_consumed = false;
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if is_match {
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if format.is_some() && format != Some(Format::Unified) {
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return Err("Conflicting output style options".to_string());
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}
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let captures = regex.captures(param.to_str().unwrap()).unwrap();
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let num = captures
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.name("num1")
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.or(captures.name("num2"))
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.or(captures.name("num3"));
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if let Some(numvalue) = num {
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if !numvalue.as_str().is_empty() {
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context_count = Some(numvalue.as_str().parse::<usize>().unwrap());
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}
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}
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if param == "-U" && next_param.is_some() {
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match next_param.unwrap().to_string_lossy().parse::<usize>() {
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Ok(context_size) => {
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context_count = Some(context_size);
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next_param_consumed = true;
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}
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Err(_) => {
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return Err(format!(
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"invalid context length '{}'",
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next_param.unwrap().to_string_lossy()
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))
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}
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}
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}
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}
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Ok(DiffStyleMatch {
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is_match,
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context_count,
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next_param_consumed,
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})
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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fn os(s: &str) -> OsString {
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OsString::from(s)
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}
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#[test]
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fn basics() {
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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..Default::default()
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}),
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parse_params(
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[os("diff"), os("foo"), os("bar")]
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.iter()
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.cloned()
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.peekable()
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)
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);
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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..Default::default()
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}),
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parse_params(
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[os("diff"), os("--normal"), os("foo"), os("bar")]
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.iter()
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.cloned()
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.peekable()
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)
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);
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}
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#[test]
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fn basics_ed() {
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for arg in ["-e", "--ed"] {
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Ed,
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..Default::default()
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}),
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parse_params(
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[os("diff"), os(arg), os("foo"), os("bar")]
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.iter()
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.cloned()
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.peekable()
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)
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);
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}
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}
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#[test]
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fn context_valid() {
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for args in [vec!["-c"], vec!["--context"], vec!["--context="]] {
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let mut params = vec!["diff"];
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params.extend(args);
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params.extend(["foo", "bar"]);
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Context,
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..Default::default()
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}),
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parse_params(params.iter().map(|x| os(x)).peekable())
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);
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}
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for args in [
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vec!["-c42"],
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vec!["-C42"],
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vec!["-C", "42"],
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vec!["--context=42"],
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vec!["-42c"],
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] {
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let mut params = vec!["diff"];
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params.extend(args);
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params.extend(["foo", "bar"]);
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Context,
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context_count: 42,
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..Default::default()
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}),
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parse_params(params.iter().map(|x| os(x)).peekable())
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);
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}
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}
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#[test]
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fn context_invalid() {
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for args in [
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vec!["-c", "42"],
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vec!["-c=42"],
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vec!["-c="],
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vec!["-C"],
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vec!["-C=42"],
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vec!["-C="],
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vec!["--context42"],
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vec!["--context", "42"],
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vec!["-42C"],
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] {
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let mut params = vec!["diff"];
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params.extend(args);
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params.extend(["foo", "bar"]);
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assert!(parse_params(params.iter().map(|x| os(x)).peekable()).is_err());
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}
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}
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#[test]
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fn unified_valid() {
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for args in [vec!["-u"], vec!["--unified"], vec!["--unified="]] {
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let mut params = vec!["diff"];
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params.extend(args);
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params.extend(["foo", "bar"]);
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Unified,
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..Default::default()
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}),
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parse_params(params.iter().map(|x| os(x)).peekable())
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);
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}
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for args in [
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vec!["-u42"],
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vec!["-U42"],
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vec!["-U", "42"],
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vec!["--unified=42"],
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vec!["-42u"],
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] {
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let mut params = vec!["diff"];
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params.extend(args);
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params.extend(["foo", "bar"]);
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Unified,
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context_count: 42,
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..Default::default()
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}),
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parse_params(params.iter().map(|x| os(x)).peekable())
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);
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}
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}
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#[test]
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fn unified_invalid() {
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for args in [
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vec!["-u", "42"],
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vec!["-u=42"],
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vec!["-u="],
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vec!["-U"],
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vec!["-U=42"],
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vec!["-U="],
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vec!["--unified42"],
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vec!["--unified", "42"],
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vec!["-42U"],
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] {
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let mut params = vec!["diff"];
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params.extend(args);
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params.extend(["foo", "bar"]);
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assert!(parse_params(params.iter().map(|x| os(x)).peekable()).is_err());
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}
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}
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#[test]
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fn context_count() {
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Unified,
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context_count: 54,
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..Default::default()
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}),
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parse_params(
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[os("diff"), os("-u54"), os("foo"), os("bar")]
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.iter()
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.cloned()
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.peekable()
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)
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);
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Unified,
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context_count: 54,
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..Default::default()
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}),
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parse_params(
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[os("diff"), os("-U54"), os("foo"), os("bar")]
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.iter()
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.cloned()
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.peekable()
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)
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);
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Unified,
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context_count: 54,
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..Default::default()
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}),
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parse_params(
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[os("diff"), os("-U"), os("54"), os("foo"), os("bar")]
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.iter()
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.cloned()
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.peekable()
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)
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);
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assert_eq!(
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Ok(Params {
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executable: os("diff"),
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from: os("foo"),
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to: os("bar"),
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format: Format::Context,
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context_count: 54,
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..Default::default()
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}),
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parse_params(
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[os("diff"), os("-c54"), os("foo"), os("bar")]
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.iter()
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.cloned()
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|
.peekable()
|
|
)
|
|
);
|
|
}
|
|
#[test]
|
|
fn report_identical_files() {
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
report_identical_files: true,
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("-s"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
report_identical_files: true,
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[
|
|
os("diff"),
|
|
os("--report-identical-files"),
|
|
os("foo"),
|
|
os("bar"),
|
|
]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
}
|
|
#[test]
|
|
fn brief() {
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
brief: true,
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("-q"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
brief: true,
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("--brief"), os("foo"), os("bar"),]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
}
|
|
#[test]
|
|
fn expand_tabs() {
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
for option in ["-t", "--expand-tabs"] {
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
expand_tabs: true,
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os(option), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
}
|
|
}
|
|
#[test]
|
|
fn tabsize() {
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
tabsize: 0,
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("--tabsize=0"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("bar"),
|
|
tabsize: 42,
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("--tabsize=42"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
assert!(parse_params(
|
|
[os("diff"), os("--tabsize"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
assert!(parse_params(
|
|
[os("diff"), os("--tabsize="), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
assert!(parse_params(
|
|
[os("diff"), os("--tabsize=r2"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
assert!(parse_params(
|
|
[os("diff"), os("--tabsize=-1"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
assert!(parse_params(
|
|
[os("diff"), os("--tabsize=r2"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
assert!(parse_params(
|
|
[
|
|
os("diff"),
|
|
os("--tabsize=92233720368547758088"),
|
|
os("foo"),
|
|
os("bar")
|
|
]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
}
|
|
#[test]
|
|
fn double_dash() {
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("-g"),
|
|
to: os("-h"),
|
|
..Default::default()
|
|
}),
|
|
parse_params(
|
|
[os("diff"), os("--"), os("-g"), os("-h")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
);
|
|
}
|
|
#[test]
|
|
fn default_to_stdin() {
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("foo"),
|
|
to: os("-"),
|
|
..Default::default()
|
|
}),
|
|
parse_params([os("diff"), os("foo"), os("-")].iter().cloned().peekable())
|
|
);
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("-"),
|
|
to: os("bar"),
|
|
..Default::default()
|
|
}),
|
|
parse_params([os("diff"), os("-"), os("bar")].iter().cloned().peekable())
|
|
);
|
|
assert_eq!(
|
|
Ok(Params {
|
|
executable: os("diff"),
|
|
from: os("-"),
|
|
to: os("-"),
|
|
..Default::default()
|
|
}),
|
|
parse_params([os("diff"), os("-"), os("-")].iter().cloned().peekable())
|
|
);
|
|
assert!(parse_params(
|
|
[os("diff"), os("foo"), os("bar"), os("-")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
assert!(parse_params(
|
|
[os("diff"), os("-"), os("-"), os("-")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
}
|
|
#[test]
|
|
fn missing_arguments() {
|
|
assert!(parse_params([os("diff")].iter().cloned().peekable()).is_err());
|
|
assert!(parse_params([os("diff"), os("foo")].iter().cloned().peekable()).is_err());
|
|
}
|
|
#[test]
|
|
fn unknown_argument() {
|
|
assert!(parse_params(
|
|
[os("diff"), os("-g"), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
assert!(
|
|
parse_params([os("diff"), os("-g"), os("bar")].iter().cloned().peekable()).is_err()
|
|
);
|
|
assert!(parse_params([os("diff"), os("-g")].iter().cloned().peekable()).is_err());
|
|
}
|
|
#[test]
|
|
fn empty() {
|
|
assert!(parse_params([].iter().cloned().peekable()).is_err());
|
|
}
|
|
#[test]
|
|
fn conflicting_output_styles() {
|
|
for (arg1, arg2) in [
|
|
("-u", "-c"),
|
|
("-u", "-e"),
|
|
("-c", "-u"),
|
|
("-c", "-U42"),
|
|
("-u", "--normal"),
|
|
("--normal", "-e"),
|
|
("--context", "--normal"),
|
|
] {
|
|
assert!(parse_params(
|
|
[os("diff"), os(arg1), os(arg2), os("foo"), os("bar")]
|
|
.iter()
|
|
.cloned()
|
|
.peekable()
|
|
)
|
|
.is_err());
|
|
}
|
|
}
|
|
}
|