1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 extern crate env_logger;
16 extern crate rustfmt_nightly as rustfmt;
20 use std::io::{self, stdout, Read, Write};
21 use std::path::{Path, PathBuf};
25 use getopts::{Matches, Options};
28 emit_post_matter, emit_pre_matter, format_and_emit_report, load_config, CliOptions, Config,
29 FileName, FmtResult, Input, Summary, Verbosity, WriteMode, WRITE_MODE_LIST,
34 let opts = make_opts();
36 let exit_code = match execute(&opts) {
37 Ok((write_mode, summary)) => {
38 if summary.has_operational_errors()
39 || summary.has_parsing_errors()
40 || (summary.has_diff && write_mode == WriteMode::Check)
48 eprintln!("{}", e.to_string());
52 // Make sure standard output is flushed before we exit.
53 std::io::stdout().flush().unwrap();
55 // Exit with given exit code.
57 // NOTE: This immediately terminates the process without doing any cleanup,
58 // so make sure to finish all necessary cleanup before this is called.
59 std::process::exit(exit_code);
62 /// Rustfmt operations.
64 /// Format files and their child modules.
67 minimal_config_path: Option<String>,
69 /// Print the help message.
71 // Print version information
73 /// Output default config to a file, or stdout if None
77 /// No file specified, read from stdin
83 /// Arguments to `--help`
90 fn make_opts() -> Options {
91 let mut opts = Options::new();
93 // Sorted in alphabetical order.
97 "Run in 'check' mode. Exits with 0 if input if formatted correctly. Exits \
98 with 1 and prints a diff if formatting is required.",
103 "Use colored output (if supported)",
104 "[always|never|auto]",
109 "Recursively searches the given path for the rustfmt.toml config file. If not \
110 found reverts to the input file path",
111 "[Path for the configuration file]",
115 "error-on-unformatted",
116 "Error if unable to get comments or string literals within max_width, \
117 or they are left with trailing whitespaces",
122 "Format specified line ranges. See README for more detail on the JSON format.",
128 "Show this message or help about a specific topic: config or file-lines",
134 "Dumps a default or minimal config to PATH. A minimal config is the \
135 subset of the current config file used for formatting the current program.",
136 "[minimal|default] PATH",
138 opts.optflag("", "skip-children", "Don't reformat child modules");
142 "Enables unstable features. Only available on nightly channel",
144 opts.optflag("v", "verbose", "Print verbose output");
145 opts.optflag("q", "quiet", "Print less output");
146 opts.optflag("V", "version", "Show version information");
150 "How to write output (not usable when piping from stdin)",
157 fn execute(opts: &Options) -> FmtResult<(WriteMode, Summary)> {
158 let matches = opts.parse(env::args().skip(1))?;
160 match determine_operation(&matches)? {
161 Operation::Help(HelpOp::None) => {
162 print_usage_to_stdout(opts, "");
163 Summary::print_exit_codes();
164 Ok((WriteMode::None, Summary::default()))
166 Operation::Help(HelpOp::Config) => {
167 Config::print_docs(&mut stdout(), matches.opt_present("unstable-features"));
168 Ok((WriteMode::None, Summary::default()))
170 Operation::Help(HelpOp::FileLines) => {
171 print_help_file_lines();
172 Ok((WriteMode::None, Summary::default()))
174 Operation::Version => {
176 Ok((WriteMode::None, Summary::default()))
178 Operation::ConfigOutputDefault { path } => {
179 let toml = Config::default().all_options().to_toml().map_err(err_msg)?;
180 if let Some(path) = path {
181 let mut file = File::create(path)?;
182 file.write_all(toml.as_bytes())?;
184 io::stdout().write_all(toml.as_bytes())?;
186 Ok((WriteMode::None, Summary::default()))
188 Operation::Stdin { input } => {
189 // try to read config from local directory
190 let options = CliOptions::from_matches(&matches)?;
191 let (mut config, _) = load_config(Some(Path::new(".")), Some(&options))?;
193 // write_mode is always Display for Stdin.
194 config.set().write_mode(WriteMode::Display);
195 config.set().verbose(Verbosity::Quiet);
198 if let Some(ref file_lines) = matches.opt_str("file-lines") {
201 .file_lines(file_lines.parse().map_err(err_msg)?);
202 for f in config.file_lines().files() {
204 FileName::Custom(ref f) if f == "stdin" => {}
205 _ => eprintln!("Warning: Extra file listed in file_lines option '{}'", f),
210 let mut error_summary = Summary::default();
211 emit_pre_matter(&config)?;
212 match format_and_emit_report(Input::Text(input), &config) {
213 Ok(summary) => error_summary.add(summary),
214 Err(_) => error_summary.add_operational_error(),
216 emit_post_matter(&config)?;
218 Ok((WriteMode::Display, error_summary))
224 let options = CliOptions::from_matches(&matches)?;
225 format(files, minimal_config_path, options)
232 minimal_config_path: Option<String>,
234 ) -> FmtResult<(WriteMode, Summary)> {
235 options.verify_file_lines(&files);
236 let (config, config_path) = load_config(None, Some(&options))?;
238 if config.verbose() == Verbosity::Verbose {
239 if let Some(path) = config_path.as_ref() {
240 println!("Using rustfmt config file {}", path.display());
244 emit_pre_matter(&config)?;
245 let mut error_summary = Summary::default();
249 eprintln!("Error: file `{}` does not exist", file.to_str().unwrap());
250 error_summary.add_operational_error();
251 } else if file.is_dir() {
252 eprintln!("Error: `{}` is a directory", file.to_str().unwrap());
253 error_summary.add_operational_error();
255 // Check the file directory if the config-path could not be read or not provided
256 let local_config = if config_path.is_none() {
257 let (local_config, config_path) =
258 load_config(Some(file.parent().unwrap()), Some(&options))?;
259 if local_config.verbose() == Verbosity::Verbose {
260 if let Some(path) = config_path {
262 "Using rustfmt config file {} for {}",
273 match format_and_emit_report(Input::File(file), &local_config) {
274 Ok(summary) => error_summary.add(summary),
276 error_summary.add_operational_error();
282 emit_post_matter(&config)?;
284 // If we were given a path via dump-minimal-config, output any options
285 // that were used during formatting as TOML.
286 if let Some(path) = minimal_config_path {
287 let mut file = File::create(path)?;
288 let toml = config.used_options().to_toml().map_err(err_msg)?;
289 file.write_all(toml.as_bytes())?;
292 Ok((config.write_mode(), error_summary))
295 fn print_usage_to_stdout(opts: &Options, reason: &str) {
296 let sep = if reason.is_empty() {
299 format!("{}\n\n", reason)
302 "{}Format Rust code\n\nusage: {} [options] <file>...",
304 env::args_os().next().unwrap().to_string_lossy()
306 println!("{}", opts.usage(&msg));
309 fn print_help_file_lines() {
311 "If you want to restrict reformatting to specific sets of lines, you can
312 use the `--file-lines` option. Its argument is a JSON array of objects
313 with `file` and `range` properties, where `file` is a file name, and
314 `range` is an array representing a range of lines like `[7,13]`. Ranges
315 are 1-based and inclusive of both end points. Specifying an empty array
316 will result in no files being formatted. For example,
319 rustfmt --file-lines '[
320 {{\"file\":\"src/lib.rs\",\"range\":[7,13]}},
321 {{\"file\":\"src/lib.rs\",\"range\":[21,29]}},
322 {{\"file\":\"src/foo.rs\",\"range\":[10,11]}},
323 {{\"file\":\"src/foo.rs\",\"range\":[15,15]}}]'
326 would format lines `7-13` and `21-29` of `src/lib.rs`, and lines `10-11`,
327 and `15` of `src/foo.rs`. No other files would be formatted, even if they
328 are included as out of line modules from `src/lib.rs`."
333 let version_info = format!(
335 option_env!("CARGO_PKG_VERSION").unwrap_or("unknown"),
336 include_str!(concat!(env!("OUT_DIR"), "/commit-info.txt"))
339 println!("rustfmt {}", version_info);
342 fn determine_operation(matches: &Matches) -> FmtResult<Operation> {
343 if matches.opt_present("h") {
344 let topic = matches.opt_str("h");
346 return Ok(Operation::Help(HelpOp::None));
347 } else if topic == Some("config".to_owned()) {
348 return Ok(Operation::Help(HelpOp::Config));
349 } else if topic == Some("file-lines".to_owned()) {
350 return Ok(Operation::Help(HelpOp::FileLines));
352 println!("Unknown help topic: `{}`\n", topic.unwrap());
353 return Ok(Operation::Help(HelpOp::None));
357 let mut minimal_config_path = None;
358 if matches.opt_present("print-config") {
359 let kind = matches.opt_str("print-config");
360 let path = matches.free.get(0);
361 if kind == "default" {
362 return Ok(Operation::ConfigOutputDefault { path: path.clone() });
363 } else if kind = "minimal" {
364 minimal_config_path = path;
365 if minimal_config_path.is_none() {
366 println!("WARNING: PATH required for `--print-config minimal`");
371 if matches.opt_present("version") {
372 return Ok(Operation::Version);
375 // if no file argument is supplied, read from stdin
376 if matches.free.is_empty() {
377 let mut buffer = String::new();
378 io::stdin().read_to_string(&mut buffer)?;
380 return Ok(Operation::Stdin { input: buffer });
383 let files: Vec<_> = matches
387 let p = PathBuf::from(s);
388 // we will do comparison later, so here tries to canonicalize first
389 // to get the expected behavior.
390 p.canonicalize().unwrap_or(p)
394 Ok(Operation::Format {