src/bin/rustfmt.rs

   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.
   4 //
   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.
  10
  11 #![cfg(not(test))]
  12
  13
  14 extern crate log;
  15 extern crate rustfmt;
  16 extern crate toml;
  17 extern crate env_logger;
  18 extern crate getopts;
  19
  20 use rustfmt::{run, Input};
  21 use rustfmt::config::{Config, WriteMode};
  22
  23 use std::{env, error};
  24 use std::fs::{self, File};
  25 use std::io::{self, ErrorKind, Read, Write};
  26 use std::path::{Path, PathBuf};
  27 use std::str::FromStr;
  28
  29 use getopts::{Matches, Options};
  30
  31 type FmtError = Box<error::Error + Send + Sync>;
  32 type FmtResult<T> = std::result::Result<T, FmtError>;
  33
  34 /// Rustfmt operations.
  35 enum Operation {
  36     /// Format files and their child modules.
  37     Format {
  38         files: Vec<PathBuf>,
  39         config_path: Option<PathBuf>,
  40     },
  41     /// Print the help message.
  42     Help,
  43     // Print version information
  44     Version,
  45     /// Print detailed configuration help.
  46     ConfigHelp,
  47     /// No file specified, read from stdin
  48     Stdin {
  49         input: String,
  50         config_path: Option<PathBuf>,
  51     },
  52 }
  53
  54 /// Try to find a project file in the given directory and its parents. Returns the path of a the
  55 /// nearest project file if one exists, or `None` if no project file was found.
  56 fn lookup_project_file(dir: &Path) -> FmtResult<Option<PathBuf>> {
  57     let mut current = if dir.is_relative() {
  58         try!(env::current_dir()).join(dir)
  59     } else {
  60         dir.to_path_buf()
  61     };
  62
  63     current = try!(fs::canonicalize(current));
  64
  65     loop {
  66         let config_file = current.join("rustfmt.toml");
  67         match fs::metadata(&config_file) {
  68             // Only return if it's a file to handle the unlikely situation of a directory named
  69             // `rustfmt.toml`.
  70             Ok(ref md) if md.is_file() => return Ok(Some(config_file)),
  71             // Return the error if it's something other than `NotFound`; otherwise we didn't find
  72             // the project file yet, and continue searching.
  73             Err(e) => {
  74                 if e.kind() != ErrorKind::NotFound {
  75                     return Err(FmtError::from(e));
  76                 }
  77             }
  78             _ => {}
  79         }
  80
  81         // If the current directory has no parent, we're done searching.
  82         if !current.pop() {
  83             return Ok(None);
  84         }
  85     }
  86 }
  87
  88 /// Resolve the config for input in `dir`.
  89 ///
  90 /// Returns the `Config` to use, and the path of the project file if there was
  91 /// one.
  92 fn resolve_config(dir: &Path) -> FmtResult<(Config, Option<PathBuf>)> {
  93     let path = try!(lookup_project_file(dir));
  94     if path.is_none() {
  95         return Ok((Config::default(), None));
  96     }
  97     let path = path.unwrap();
  98     let mut file = try!(File::open(&path));
  99     let mut toml = String::new();
 100     try!(file.read_to_string(&mut toml));
 101     Ok((Config::from_toml(&toml), Some(path)))
 102 }
 103
 104 /// read the given config file path recursively if present else read the project file path
 105 fn match_cli_path_or_file(config_path: Option<PathBuf>,
 106                           input_file: &Path)
 107                           -> FmtResult<(Config, Option<PathBuf>)> {
 108
 109     if let Some(config_file) = config_path {
 110         let (toml, path) = try!(resolve_config(config_file.as_ref()));
 111         if path.is_some() {
 112             return Ok((toml, path));
 113         }
 114     }
 115     resolve_config(input_file)
 116 }
 117
 118 fn update_config(config: &mut Config, matches: &Matches) -> FmtResult<()> {
 119     config.verbose = matches.opt_present("verbose");
 120     config.skip_children = matches.opt_present("skip-children");
 121
 122     let write_mode = matches.opt_str("write-mode");
 123     match matches.opt_str("write-mode").map(|wm| WriteMode::from_str(&wm)) {
 124         None => Ok(()),
 125         Some(Ok(write_mode)) => {
 126             config.write_mode = write_mode;
 127             Ok(())
 128         }
 129         Some(Err(_)) => {
 130             Err(FmtError::from(format!("Invalid write-mode: {}",
 131                                        write_mode.expect("cannot happen"))))
 132         }
 133     }
 134 }
 135
 136 fn make_opts() -> Options {
 137     let mut opts = Options::new();
 138     opts.optflag("h", "help", "show this message");
 139     opts.optflag("V", "version", "show version information");
 140     opts.optflag("v", "verbose", "show progress");
 141     opts.optopt("",
 142                 "write-mode",
 143                 "mode to write in (not usable when piping from stdin)",
 144                 "[replace|overwrite|display|diff|coverage|checkstyle]");
 145     opts.optflag("", "skip-children", "don't reformat child modules");
 146
 147     opts.optflag("",
 148                  "config-help",
 149                  "show details of rustfmt configuration options");
 150     opts.optopt("",
 151                 "config-path",
 152                 "Recursively searches the given path for the rustfmt.toml config file. If not \
 153                  found reverts to the input file path",
 154                 "[Path for the configuration file]");
 155
 156     opts
 157 }
 158
 159 fn execute(opts: &Options) -> FmtResult<()> {
 160     let matches = try!(opts.parse(env::args().skip(1)));
 161
 162     match try!(determine_operation(&matches)) {
 163         Operation::Help => {
 164             print_usage(&opts, "");
 165         }
 166         Operation::Version => {
 167             print_version();
 168         }
 169         Operation::ConfigHelp => {
 170             Config::print_docs();
 171         }
 172         Operation::Stdin { input, config_path } => {
 173             // try to read config from local directory
 174             let (mut config, _) = match_cli_path_or_file(config_path, &env::current_dir().unwrap())
 175                                       .expect("Error resolving config");
 176
 177             // write_mode is always Plain for Stdin.
 178             config.write_mode = WriteMode::Plain;
 179
 180             run(Input::Text(input), &config);
 181         }
 182         Operation::Format { files, config_path } => {
 183             let mut config = Config::default();
 184             let mut path = None;
 185             // Load the config path file if provided
 186             if let Some(config_file) = config_path {
 187                 let (cfg_tmp, path_tmp) = resolve_config(config_file.as_ref())
 188                                               .expect(&format!("Error resolving config for {:?}",
 189                                                                config_file));
 190                 config = cfg_tmp;
 191                 path = path_tmp;
 192             };
 193             if let Some(path) = path.as_ref() {
 194                 println!("Using rustfmt config file {}", path.display());
 195             }
 196             for file in files {
 197                 // Check the file directory if the config-path could not be read or not provided
 198                 if path.is_none() {
 199                     let (config_tmp, path_tmp) = resolve_config(file.parent().unwrap())
 200                                                      .expect(&format!("Error resolving config \
 201                                                                        for {}",
 202                                                                       file.display()));
 203                     if let Some(path) = path_tmp.as_ref() {
 204                         println!("Using rustfmt config file {} for {}",
 205                                  path.display(),
 206                                  file.display());
 207                     }
 208                     config = config_tmp;
 209                 }
 210
 211                 try!(update_config(&mut config, &matches));
 212                 run(Input::File(file), &config);
 213             }
 214         }
 215     }
 216     Ok(())
 217 }
 218
 219 fn main() {
 220     let _ = env_logger::init();
 221
 222     let opts = make_opts();
 223
 224     let exit_code = match execute(&opts) {
 225         Ok(..) => 0,
 226         Err(e) => {
 227             print_usage(&opts, &e.to_string());
 228             1
 229         }
 230     };
 231     // Make sure standard output is flushed before we exit.
 232     std::io::stdout().flush().unwrap();
 233
 234     // Exit with given exit code.
 235     //
 236     // NOTE: This immediately terminates the process without doing any cleanup,
 237     // so make sure to finish all necessary cleanup before this is called.
 238     std::process::exit(exit_code);
 239 }
 240
 241 fn print_usage(opts: &Options, reason: &str) {
 242     let reason = format!("{}\nusage: {} [options] <file>...",
 243                          reason,
 244                          env::args_os().next().unwrap().to_string_lossy());
 245     println!("{}", opts.usage(&reason));
 246 }
 247
 248 fn print_version() {
 249     println!("{}.{}.{}{}",
 250              option_env!("CARGO_PKG_VERSION_MAJOR").unwrap_or("X"),
 251              option_env!("CARGO_PKG_VERSION_MINOR").unwrap_or("X"),
 252              option_env!("CARGO_PKG_VERSION_PATCH").unwrap_or("X"),
 253              option_env!("CARGO_PKG_VERSION_PRE").unwrap_or(""));
 254 }
 255
 256 fn determine_operation(matches: &Matches) -> FmtResult<Operation> {
 257     if matches.opt_present("h") {
 258         return Ok(Operation::Help);
 259     }
 260
 261     if matches.opt_present("config-help") {
 262         return Ok(Operation::ConfigHelp);
 263     }
 264
 265     if matches.opt_present("version") {
 266         return Ok(Operation::Version);
 267     }
 268
 269     // Read the config_path and convert to parent dir if a file is provided.
 270     let config_path: Option<PathBuf> = matches.opt_str("config-path")
 271                                               .map(PathBuf::from)
 272                                               .and_then(|dir| {
 273                                                   if dir.is_file() {
 274                                                       return dir.parent().map(|v| v.into());
 275                                                   }
 276                                                   Some(dir)
 277                                               });
 278
 279     // if no file argument is supplied, read from stdin
 280     if matches.free.is_empty() {
 281
 282         let mut buffer = String::new();
 283         try!(io::stdin().read_to_string(&mut buffer));
 284
 285         return Ok(Operation::Stdin {
 286             input: buffer,
 287             config_path: config_path,
 288         });
 289     }
 290
 291     let files: Vec<_> = matches.free.iter().map(PathBuf::from).collect();
 292
 293     Ok(Operation::Format {
 294         files: files,
 295         config_path: config_path,
 296     })
 297 }