1 // Copyright 2015-2016 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.
11 // Inspired by Paul Woolcock's cargo-fmt (https://github.com/pwoolcoc/cargo-fmt/)
16 extern crate cargo_metadata;
18 extern crate serde_json as json;
22 use std::hash::{Hash, Hasher};
23 use std::io::{self, Write};
24 use std::path::{Path, PathBuf};
25 use std::process::{Command, ExitStatus};
27 use std::collections::HashSet;
28 use std::iter::FromIterator;
30 use getopts::{Matches, Options};
33 let exit_status = execute();
34 std::io::stdout().flush().unwrap();
35 std::process::exit(exit_status);
38 const SUCCESS: i32 = 0;
39 const FAILURE: i32 = 1;
42 let mut opts = getopts::Options::new();
43 opts.optflag("h", "help", "show this message");
44 opts.optflag("q", "quiet", "no output printed to stdout");
45 opts.optflag("v", "verbose", "use verbose output");
49 "specify package to format (only usable in workspaces)",
52 opts.optflag("", "version", "print rustfmt version and exit");
53 opts.optflag("", "all", "format all packages (only usable in workspaces)");
55 // If there is any invalid argument passed to `cargo fmt`, return without formatting.
56 let mut is_package_arg = false;
57 for arg in env::args().skip(2).take_while(|a| a != "--") {
58 if arg.starts_with('-') {
59 is_package_arg = arg.starts_with("--package");
60 } else if !is_package_arg {
61 print_usage_to_stderr(&opts, &format!("Invalid argument: `{}`.", arg));
64 is_package_arg = false;
68 let matches = match opts.parse(env::args().skip(1).take_while(|a| a != "--")) {
71 print_usage_to_stderr(&opts, &e.to_string());
76 let verbosity = match (matches.opt_present("v"), matches.opt_present("q")) {
77 (false, false) => Verbosity::Normal,
78 (false, true) => Verbosity::Quiet,
79 (true, false) => Verbosity::Verbose,
81 print_usage_to_stderr(&opts, "quiet mode and verbose mode are not compatible");
86 if matches.opt_present("h") {
87 print_usage_to_stdout(&opts, "");
91 if matches.opt_present("version") {
92 return handle_command_status(get_version(verbosity), &opts);
95 let strategy = CargoFmtStrategy::from_matches(&matches);
96 handle_command_status(format_crate(verbosity, &strategy), &opts)
99 macro_rules! print_usage {
100 ($print:ident, $opts:ident, $reason:expr) => ({
101 let msg = format!("{}\nusage: cargo fmt [options]", $reason);
103 "{}\nThis utility formats all bin and lib files of the current crate using rustfmt. \
104 Arguments after `--` are passed to rustfmt.",
110 fn print_usage_to_stdout(opts: &Options, reason: &str) {
111 print_usage!(println, opts, reason);
114 fn print_usage_to_stderr(opts: &Options, reason: &str) {
115 print_usage!(eprintln, opts, reason);
118 #[derive(Debug, Clone, Copy, PartialEq)]
125 fn handle_command_status(status: Result<ExitStatus, io::Error>, opts: &getopts::Options) -> i32 {
128 print_usage_to_stderr(&opts, &e.to_string());
132 if status.success() {
135 status.code().unwrap_or(FAILURE)
141 fn get_version(verbosity: Verbosity) -> Result<ExitStatus, io::Error> {
142 run_rustfmt(&vec![], &vec![String::from("--version")], verbosity)
146 verbosity: Verbosity,
147 strategy: &CargoFmtStrategy,
148 ) -> Result<ExitStatus, io::Error> {
149 let rustfmt_args = get_fmt_args();
150 let targets = if rustfmt_args.iter().any(|s| s == "--dump-default-config") {
153 get_targets(strategy)?
156 // Currently only bin and lib files get formatted
157 let files: Vec<_> = targets
160 if verbosity == Verbosity::Verbose {
161 println!("[{}] {:?}", t.kind, t.path)
167 run_rustfmt(&files, &rustfmt_args, verbosity)
170 fn get_fmt_args() -> Vec<String> {
171 // All arguments after -- are passed to rustfmt
172 env::args().skip_while(|a| a != "--").skip(1).collect()
175 /// Target uses a `path` field for equality and hashing.
178 /// A path to the main source file of the target.
180 /// A kind of target (e.g. lib, bin, example, ...).
185 pub fn from_target(target: &cargo_metadata::Target) -> Self {
186 let path = PathBuf::from(&target.src_path);
187 let canonicalized = fs::canonicalize(&path).unwrap_or(path);
191 kind: target.kind[0].clone(),
196 impl PartialEq for Target {
197 fn eq(&self, other: &Target) -> bool {
198 self.path == other.path
202 impl Eq for Target {}
204 impl Hash for Target {
205 fn hash<H: Hasher>(&self, state: &mut H) {
206 self.path.hash(state);
210 #[derive(Debug, PartialEq, Eq)]
211 pub enum CargoFmtStrategy {
212 /// Format every packages and dependencies.
214 /// Format pacakges that are specified by the command line argument.
216 /// Format the root packages only.
220 impl CargoFmtStrategy {
221 pub fn from_matches(matches: &Matches) -> CargoFmtStrategy {
222 match (matches.opt_present("all"), matches.opt_present("p")) {
223 (false, false) => CargoFmtStrategy::Root,
224 (true, _) => CargoFmtStrategy::All,
225 (false, true) => CargoFmtStrategy::Some(matches.opt_strs("p")),
230 /// Based on the specified `CargoFmtStrategy`, returns a set of main source files.
231 fn get_targets(strategy: &CargoFmtStrategy) -> Result<HashSet<Target>, io::Error> {
232 let mut targets = HashSet::new();
235 CargoFmtStrategy::Root => get_targets_root_only(&mut targets)?,
236 CargoFmtStrategy::All => get_targets_recursive(None, &mut targets, &mut HashSet::new())?,
237 CargoFmtStrategy::Some(ref hitlist) => get_targets_with_hitlist(hitlist, &mut targets)?,
240 if targets.is_empty() {
242 io::ErrorKind::Other,
243 "Failed to find targets".to_owned(),
250 fn get_targets_root_only(targets: &mut HashSet<Target>) -> Result<(), io::Error> {
251 let metadata = get_cargo_metadata(None)?;
253 for package in metadata.packages {
254 for target in package.targets {
255 targets.insert(Target::from_target(&target));
262 fn get_targets_recursive(
263 manifest_path: Option<&Path>,
264 mut targets: &mut HashSet<Target>,
265 visited: &mut HashSet<String>,
266 ) -> Result<(), io::Error> {
267 let metadata = get_cargo_metadata(manifest_path)?;
269 for package in metadata.packages {
270 add_targets(&package.targets, &mut targets);
272 // Look for local dependencies.
273 for dependency in package.dependencies {
274 if dependency.source.is_some() || visited.contains(&dependency.name) {
278 let mut manifest_path = PathBuf::from(&package.manifest_path);
281 manifest_path.push(&dependency.name);
282 manifest_path.push("Cargo.toml");
284 if manifest_path.exists() {
285 visited.insert(dependency.name);
286 get_targets_recursive(Some(&manifest_path), &mut targets, visited)?;
294 fn get_targets_with_hitlist(
296 targets: &mut HashSet<Target>,
297 ) -> Result<(), io::Error> {
298 let metadata = get_cargo_metadata(None)?;
300 let mut workspace_hitlist: HashSet<&String> = HashSet::from_iter(hitlist);
302 for package in metadata.packages {
303 if workspace_hitlist.remove(&package.name) {
304 for target in package.targets {
305 targets.insert(Target::from_target(&target));
310 if workspace_hitlist.is_empty() {
313 let package = workspace_hitlist.iter().next().unwrap();
315 io::ErrorKind::InvalidInput,
316 format!("package `{}` is not a member of the workspace", package),
321 fn add_targets(target_paths: &[cargo_metadata::Target], targets: &mut HashSet<Target>) {
322 for target in target_paths {
323 targets.insert(Target::from_target(target));
330 verbosity: Verbosity,
331 ) -> Result<ExitStatus, io::Error> {
332 let stdout = if verbosity == Verbosity::Quiet {
333 std::process::Stdio::null()
335 std::process::Stdio::inherit()
338 if verbosity == Verbosity::Verbose {
344 print!(" {}", f.display());
349 let mut command = Command::new("rustfmt")
354 .map_err(|e| match e.kind() {
355 io::ErrorKind::NotFound => io::Error::new(
356 io::ErrorKind::Other,
357 "Could not run rustfmt, please make sure it is in your PATH.",
365 fn get_cargo_metadata(manifest_path: Option<&Path>) -> Result<cargo_metadata::Metadata, io::Error> {
366 match cargo_metadata::metadata(manifest_path) {
367 Ok(metadata) => Ok(metadata),
368 Err(..) => Err(io::Error::new(
369 io::ErrorKind::Other,
370 "`cargo manifest` failed.",