1 // Copyright 2018 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 use syntax::codemap::FileName;
13 use config::config_type::ConfigType;
14 use config::file_lines::FileLines;
22 use std::collections::HashSet;
23 use std::path::{Path, PathBuf};
24 use std::str::FromStr;
26 /// Macro for deriving implementations of Serialize/Deserialize for enums
28 macro_rules! impl_enum_serialize_and_deserialize {
29 ( $e:ident, $( $x:ident ),* ) => {
30 impl ::serde::ser::Serialize for $e {
31 fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
32 where S: ::serde::ser::Serializer
34 use serde::ser::Error;
36 // We don't know whether the user of the macro has given us all options.
37 #[allow(unreachable_patterns)]
40 $e::$x => serializer.serialize_str(stringify!($x)),
43 Err(S::Error::custom(format!("Cannot serialize {:?}", self)))
49 impl<'de> ::serde::de::Deserialize<'de> for $e {
50 fn deserialize<D>(d: D) -> Result<Self, D::Error>
51 where D: ::serde::Deserializer<'de> {
52 use serde::de::{Error, Visitor};
53 use std::marker::PhantomData;
55 struct StringOnly<T>(PhantomData<T>);
56 impl<'de, T> Visitor<'de> for StringOnly<T>
57 where T: ::serde::Deserializer<'de> {
59 fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
60 formatter.write_str("string")
62 fn visit_str<E>(self, value: &str) -> Result<String, E> {
63 Ok(String::from(value))
66 let s = d.deserialize_string(StringOnly::<D>(PhantomData))?;
68 if stringify!($x).eq_ignore_ascii_case(&s) {
72 static ALLOWED: &'static[&str] = &[$(stringify!($x),)*];
73 Err(D::Error::unknown_variant(&s, ALLOWED))
77 impl ::std::str::FromStr for $e {
78 type Err = &'static str;
80 fn from_str(s: &str) -> Result<Self, Self::Err> {
82 if stringify!($x).eq_ignore_ascii_case(s) {
90 impl ConfigType for $e {
91 fn doc_hint() -> String {
92 let mut variants = Vec::new();
94 variants.push(stringify!($x));
96 format!("[{}]", variants.join("|"))
102 macro_rules! configuration_option_enum{
103 ($e:ident: $( $x:ident ),+ $(,)*) => {
104 #[derive(Copy, Clone, Eq, PartialEq, Debug)]
109 impl_enum_serialize_and_deserialize!($e, $( $x ),+);
113 configuration_option_enum! { NewlineStyle:
116 Native, // \r\n in Windows, \n on other platforms
119 configuration_option_enum! { BraceStyle:
122 // Prefer same line except where there is a where clause, in which case force
123 // the brace to the next line.
127 configuration_option_enum! { ControlBraceStyle:
128 // K&R style, Rust community default
136 configuration_option_enum! { IndentStyle:
137 // First line on the same line as the opening brace, all lines aligned with
140 // First line is on a new line and all lines align with block indent.
144 configuration_option_enum! { Density:
145 // Fit as much on one line as possible.
149 // Place every item on a separate line.
153 configuration_option_enum! { TypeDensity:
154 // No spaces around "=" and "+"
156 // Spaces around " = " and " + "
161 pub fn to_list_tactic(self) -> ListTactic {
163 Density::Compressed => ListTactic::Mixed,
164 Density::Tall => ListTactic::HorizontalVertical,
165 Density::Vertical => ListTactic::Vertical,
170 configuration_option_enum! { ReportTactic:
176 configuration_option_enum! { WriteMode:
177 // Overwrites original file without backup.
179 // Backs the original file up and overwrites the original.
181 // Writes the output to stdout.
183 // Displays how much of the input file was processed
187 // Output the changed lines (for internal value only)
189 // Checks if a diff can be generated. If so, rustfmt outputs a diff and quits with exit code 1.
190 // This option is designed to be run in CI where a non-zero exit signifies non-standard code
193 // Rustfmt shouldn't output anything formatting-like (e.g., emit a help message).
197 const STABLE_WRITE_MODES: [WriteMode; 4] = [
199 WriteMode::Overwrite,
204 configuration_option_enum! { Color:
205 // Always use color, whether it is a piped or terminal output
209 // Automatically use color, if supported by terminal
213 configuration_option_enum! { Verbosity:
217 // Emit as little as possible.
221 #[derive(Deserialize, Serialize, Clone, Debug)]
222 pub struct WidthHeuristics {
223 // Maximum width of the args of a function call before falling back
224 // to vertical formatting.
225 pub fn_call_width: usize,
226 // Maximum width in the body of a struct lit before falling back to
227 // vertical formatting.
228 pub struct_lit_width: usize,
229 // Maximum width in the body of a struct variant before falling back
230 // to vertical formatting.
231 pub struct_variant_width: usize,
232 // Maximum width of an array literal before falling back to vertical
234 pub array_width: usize,
235 // Maximum length of a chain to fit on a single line.
236 pub chain_width: usize,
237 // Maximum line length for single line if-else expressions. A value
238 // of zero means always break if-else expressions.
239 pub single_line_if_else_max_width: usize,
242 impl WidthHeuristics {
243 // Using this WidthHeuristics means we ignore heuristics.
244 pub fn null() -> WidthHeuristics {
246 fn_call_width: usize::max_value(),
248 struct_variant_width: 0,
249 array_width: usize::max_value(),
250 chain_width: usize::max_value(),
251 single_line_if_else_max_width: 0,
255 // scale the default WidthHeuristics according to max_width
256 pub fn scaled(max_width: usize) -> WidthHeuristics {
257 const DEFAULT_MAX_WIDTH: usize = 100;
258 let max_width_ratio = if max_width > DEFAULT_MAX_WIDTH {
259 let ratio = max_width as f32 / DEFAULT_MAX_WIDTH as f32;
260 // round to the closest 0.1
261 (ratio * 10.0).round() / 10.0
266 fn_call_width: (60.0 * max_width_ratio).round() as usize,
267 struct_lit_width: (18.0 * max_width_ratio).round() as usize,
268 struct_variant_width: (35.0 * max_width_ratio).round() as usize,
269 array_width: (60.0 * max_width_ratio).round() as usize,
270 chain_width: (60.0 * max_width_ratio).round() as usize,
271 single_line_if_else_max_width: (50.0 * max_width_ratio).round() as usize,
276 impl ::std::str::FromStr for WidthHeuristics {
277 type Err = &'static str;
279 fn from_str(_: &str) -> Result<Self, Self::Err> {
280 Err("WidthHeuristics is not parsable")
284 impl Default for WriteMode {
285 fn default() -> WriteMode {
290 /// A set of directories, files and modules that rustfmt should ignore.
291 #[derive(Default, Deserialize, Serialize, Clone, Debug)]
292 pub struct IgnoreList(HashSet<PathBuf>);
295 pub fn add_prefix(&mut self, dir: &Path) {
303 let mut path = PathBuf::from(dir);
311 fn skip_file_inner(&self, file: &Path) -> bool {
312 self.0.iter().any(|path| file.starts_with(path))
315 pub fn skip_file(&self, file: &FileName) -> bool {
316 if let FileName::Real(ref path) = file {
317 self.skip_file_inner(path)
324 impl ::std::str::FromStr for IgnoreList {
325 type Err = &'static str;
327 fn from_str(_: &str) -> Result<Self, Self::Err> {
328 Err("IgnoreList is not parsable")
332 /// Parsed command line options.
333 #[derive(Clone, Debug, Default)]
334 pub struct CliOptions {
335 pub skip_children: Option<bool>,
338 pub config_path: Option<PathBuf>,
339 pub write_mode: WriteMode,
341 pub color: Option<Color>,
342 pub file_lines: FileLines, // Default is all lines in all files.
343 pub unstable_features: bool,
344 pub error_on_unformatted: Option<bool>,
348 pub fn from_matches(matches: &Matches) -> FmtResult<CliOptions> {
349 let mut options = CliOptions::default();
350 options.verbose = matches.opt_present("verbose");
351 options.quiet = matches.opt_present("quiet");
352 if options.verbose && options.quiet {
353 return Err(format_err!("Can't use both `--verbose` and `--quiet`"));
356 let rust_nightly = option_env!("CFG_RELEASE_CHANNEL")
357 .map(|c| c == "nightly")
360 options.unstable_features = matches.opt_present("unstable-features");
363 if !options.unstable_features {
364 if matches.opt_present("skip-children") {
365 options.skip_children = Some(true);
367 if matches.opt_present("error-on-unformatted") {
368 options.error_on_unformatted = Some(true);
370 if let Some(ref file_lines) = matches.opt_str("file-lines") {
371 options.file_lines = file_lines.parse().map_err(err_msg)?;
375 options.config_path = matches.opt_str("config-path").map(PathBuf::from);
377 options.check = matches.opt_present("check");
378 if let Some(ref emit_str) = matches.opt_str("emit") {
380 return Err(format_err!("Invalid to use `--emit` and `--check`"));
382 if let Ok(write_mode) = write_mode_from_emit_str(emit_str) {
383 options.write_mode = write_mode;
385 return Err(format_err!("Invalid value for `--emit`"));
389 if options.write_mode == WriteMode::Overwrite && matches.opt_present("backup") {
390 options.write_mode = WriteMode::Replace;
394 if !STABLE_WRITE_MODES.contains(&options.write_mode) {
395 return Err(format_err!(
396 "Invalid value for `--emit` - using an unstable \
397 value without `--unstable-features`",
402 if let Some(ref color) = matches.opt_str("color") {
403 match Color::from_str(color) {
404 Ok(color) => options.color = Some(color),
405 _ => return Err(format_err!("Invalid color: {}", color)),
412 pub fn apply_to(self, config: &mut Config) {
414 config.set().verbose(Verbosity::Verbose);
415 } else if self.quiet {
416 config.set().verbose(Verbosity::Quiet);
418 config.set().verbose(Verbosity::Normal);
420 config.set().file_lines(self.file_lines);
421 config.set().unstable_features(self.unstable_features);
422 if let Some(skip_children) = self.skip_children {
423 config.set().skip_children(skip_children);
425 if let Some(error_on_unformatted) = self.error_on_unformatted {
426 config.set().error_on_unformatted(error_on_unformatted);
429 config.set().write_mode(WriteMode::Check);
431 config.set().write_mode(self.write_mode);
433 if let Some(color) = self.color {
434 config.set().color(color);
438 pub fn verify_file_lines(&self, files: &[PathBuf]) {
439 for f in self.file_lines.files() {
441 FileName::Real(ref f) if files.contains(f) => {}
442 FileName::Real(_) => {
443 eprintln!("Warning: Extra file listed in file_lines option '{}'", f)
445 _ => eprintln!("Warning: Not a file '{}'", f),
451 fn write_mode_from_emit_str(emit_str: &str) -> FmtResult<WriteMode> {
453 "files" => Ok(WriteMode::Overwrite),
454 "stdout" => Ok(WriteMode::Display),
455 "coverage" => Ok(WriteMode::Coverage),
456 "checkstyle" => Ok(WriteMode::Checkstyle),
457 _ => Err(format_err!("Invalid value for `--emit`")),