2 use std::default::Default;
4 use std::io::{Error, ErrorKind, Read};
5 use std::path::{Path, PathBuf};
10 use crate::config::config_type::ConfigType;
11 pub use crate::config::file_lines::{FileLines, FileName, Range};
12 pub use crate::config::lists::*;
13 pub use crate::config::options::*;
24 // This macro defines configuration options used in rustfmt. Each option
25 // is defined as follows:
27 // `name: value type, default value, is stable, description;`
30 max_width: usize, 100, true, "Maximum width of each line";
31 hard_tabs: bool, false, true, "Use tab characters for indentation, spaces for alignment";
32 tab_spaces: usize, 4, true, "Number of spaces per tab";
33 newline_style: NewlineStyle, NewlineStyle::Auto, true, "Unix or Windows line endings";
34 use_small_heuristics: Heuristics, Heuristics::Default, true, "Whether to use different \
35 formatting for items and expressions if they satisfy a heuristic notion of 'small'";
36 indent_style: IndentStyle, IndentStyle::Block, false, "How do we indent expressions or items";
38 // Comments. macros, and strings
39 wrap_comments: bool, false, false, "Break comments to fit on the line";
40 format_doc_comments: bool, false, false, "Format doc comments.";
41 comment_width: usize, 80, false,
42 "Maximum length of comments. No effect unless wrap_comments = true";
43 normalize_comments: bool, false, false, "Convert /* */ comments to // comments where possible";
44 normalize_doc_attributes: bool, false, false, "Normalize doc attributes as doc comments";
45 license_template_path: String, String::default(), false,
46 "Beginning of file must match license template";
47 format_strings: bool, false, false, "Format string literals where necessary";
48 format_macro_matchers: bool, false, false,
49 "Format the metavariable matching patterns in macros";
50 format_macro_bodies: bool, true, false, "Format the bodies of macros";
52 // Single line expressions and items
53 empty_item_single_line: bool, true, false,
54 "Put empty-body functions and impls on a single line";
55 struct_lit_single_line: bool, true, false,
56 "Put small struct literals on a single line";
57 fn_single_line: bool, false, false, "Put single-expression functions on a single line";
58 where_single_line: bool, false, false, "Force where-clauses to be on a single line";
61 imports_indent: IndentStyle, IndentStyle::Block, false, "Indent of imports";
62 imports_layout: ListTactic, ListTactic::Mixed, false, "Item layout inside a import block";
63 merge_imports: bool, false, false, "Merge imports";
66 reorder_imports: bool, true, true, "Reorder import and extern crate statements alphabetically";
67 reorder_modules: bool, true, true, "Reorder module statements alphabetically in group";
68 reorder_impl_items: bool, false, false, "Reorder impl items";
70 // Spaces around punctuation
71 type_punctuation_density: TypeDensity, TypeDensity::Wide, false,
72 "Determines if '+' or '=' are wrapped in spaces in the punctuation of types";
73 space_before_colon: bool, false, false, "Leave a space before the colon";
74 space_after_colon: bool, true, false, "Leave a space after the colon";
75 spaces_around_ranges: bool, false, false, "Put spaces around the .. and ..= range operators";
76 binop_separator: SeparatorPlace, SeparatorPlace::Front, false,
77 "Where to put a binary operator when a binary expression goes multiline";
80 remove_nested_parens: bool, true, true, "Remove nested parens";
81 combine_control_expr: bool, true, false, "Combine control expressions with function calls";
82 overflow_delimited_expr: bool, false, false,
83 "Allow trailing bracket/brace delimited expressions to overflow";
84 struct_field_align_threshold: usize, 0, false,
85 "Align struct fields if their diffs fits within threshold";
86 enum_discrim_align_threshold: usize, 0, false,
87 "Align enum variants discrims, if their diffs fit within threshold";
88 match_arm_blocks: bool, true, false, "Wrap the body of arms in blocks when it does not fit on \
89 the same line with the pattern of arms";
90 force_multiline_blocks: bool, false, false,
91 "Force multiline closure bodies and match arms to be wrapped in a block";
92 fn_args_density: Density, Density::Tall, false, "Argument density in functions";
93 brace_style: BraceStyle, BraceStyle::SameLineWhere, false, "Brace style for items";
94 control_brace_style: ControlBraceStyle, ControlBraceStyle::AlwaysSameLine, false,
95 "Brace style for control flow constructs";
96 trailing_semicolon: bool, true, false,
97 "Add trailing semicolon after break, continue and return";
98 trailing_comma: SeparatorTactic, SeparatorTactic::Vertical, false,
99 "How to handle trailing commas for lists";
100 match_block_trailing_comma: bool, false, false,
101 "Put a trailing comma after a block based match arm (non-block arms are not affected)";
102 blank_lines_upper_bound: usize, 1, false,
103 "Maximum number of blank lines which can be put between items";
104 blank_lines_lower_bound: usize, 0, false,
105 "Minimum number of blank lines which must be put between items";
106 edition: Edition, Edition::Edition2015, true, "The edition of the parser (RFC 2052)";
107 version: Version, Version::One, false, "Version of formatting rules";
108 inline_attribute_width: usize, 0, false,
109 "Write an item and its attribute on the same line \
110 if their combined width is below a threshold";
112 // Options that can change the source code beyond whitespace/blocks (somewhat linty things)
113 merge_derives: bool, true, true, "Merge multiple `#[derive(...)]` into a single one";
114 use_try_shorthand: bool, false, true, "Replace uses of the try! macro by the ? shorthand";
115 use_field_init_shorthand: bool, false, true, "Use field initialization shorthand if possible";
116 force_explicit_abi: bool, true, true, "Always print the abi for extern items";
117 condense_wildcard_suffixes: bool, false, false, "Replace strings of _ wildcards by a single .. \
120 // Control options (changes the operation of rustfmt, rather than the formatting)
121 color: Color, Color::Auto, false,
122 "What Color option to use when none is supplied: Always, Never, Auto";
123 required_version: String, env!("CARGO_PKG_VERSION").to_owned(), false,
124 "Require a specific version of rustfmt";
125 unstable_features: bool, false, false,
126 "Enables unstable features. Only available on nightly channel";
127 disable_all_formatting: bool, false, false, "Don't reformat anything";
128 skip_children: bool, false, false, "Don't reformat out of line modules";
129 hide_parse_errors: bool, false, false, "Hide errors from the parser";
130 error_on_line_overflow: bool, false, false, "Error if unable to get all lines within max_width";
131 error_on_unformatted: bool, false, false,
132 "Error if unable to get comments or string literals within max_width, \
133 or they are left with trailing whitespaces";
134 report_todo: ReportTactic, ReportTactic::Never, false,
135 "Report all, none or unnumbered occurrences of TODO in source file comments";
136 report_fixme: ReportTactic, ReportTactic::Never, false,
137 "Report all, none or unnumbered occurrences of FIXME in source file comments";
138 ignore: IgnoreList, IgnoreList::default(), false,
139 "Skip formatting the specified files and directories";
142 verbose: Verbosity, Verbosity::Normal, false, "How much to information to emit to the user";
143 file_lines: FileLines, FileLines::all(), false,
144 "Lines to format; this is not supported in rustfmt.toml, and can only be specified \
145 via the --file-lines option";
146 width_heuristics: WidthHeuristics, WidthHeuristics::scaled(100), false,
147 "'small' heuristic values";
148 emit_mode: EmitMode, EmitMode::Files, false,
149 "What emit Mode to use when none is supplied";
150 make_backup: bool, false, false, "Backup changed files";
154 pub fn to_toml(&self) -> Result<String, String> {
155 // Non-user-facing options can't be specified in TOML
156 let mut cloned = self.clone();
157 cloned.file_lines = None;
158 cloned.verbose = None;
159 cloned.width_heuristics = None;
161 ::toml::to_string(&cloned).map_err(|e| format!("Could not output config: {}", e))
166 pub(crate) fn version_meets_requirement(&self) -> bool {
167 if self.was_set().required_version() {
168 let version = env!("CARGO_PKG_VERSION");
169 let required_version = self.required_version();
170 if version != required_version {
172 "Error: rustfmt version ({}) doesn't match the required version ({})",
173 version, required_version,
182 /// Constructs a `Config` from the toml file specified at `file_path`.
184 /// This method only looks at the provided path, for a method that
185 /// searches parents for a `rustfmt.toml` see `from_resolved_toml_path`.
187 /// Returns a `Config` if the config could be read and parsed from
188 /// the file, otherwise errors.
189 pub(super) fn from_toml_path(file_path: &Path) -> Result<Config, Error> {
190 let mut file = File::open(&file_path)?;
191 let mut toml = String::new();
192 file.read_to_string(&mut toml)?;
193 Config::from_toml(&toml).map_err(|err| Error::new(ErrorKind::InvalidData, err))
196 /// Resolves the config for input in `dir`.
198 /// Searches for `rustfmt.toml` beginning with `dir`, and
199 /// recursively checking parents of `dir` if no config file is found.
200 /// If no config file exists in `dir` or in any parent, a
201 /// default `Config` will be returned (and the returned path will be empty).
203 /// Returns the `Config` to use, and the path of the project file if there was
205 pub(super) fn from_resolved_toml_path(dir: &Path) -> Result<(Config, Option<PathBuf>), Error> {
206 /// Try to find a project file in the given directory and its parents.
207 /// Returns the path of a the nearest project file if one exists,
208 /// or `None` if no project file was found.
209 fn resolve_project_file(dir: &Path) -> Result<Option<PathBuf>, Error> {
210 let mut current = if dir.is_relative() {
211 env::current_dir()?.join(dir)
216 current = fs::canonicalize(current)?;
219 match get_toml_path(¤t) {
220 Ok(Some(path)) => return Ok(Some(path)),
221 Err(e) => return Err(e),
225 // If the current directory has no parent, we're done searching.
231 // If nothing was found, check in the home directory.
232 if let Some(home_dir) = dirs::home_dir() {
233 if let Some(path) = get_toml_path(&home_dir)? {
234 return Ok(Some(path));
238 // If none was found ther either, check in the user's configuration directory.
239 if let Some(mut config_dir) = dirs::config_dir() {
240 config_dir.push("rustfmt");
241 if let Some(path) = get_toml_path(&config_dir)? {
242 return Ok(Some(path));
249 match resolve_project_file(dir)? {
250 None => Ok((Config::default(), None)),
251 Some(path) => Config::from_toml_path(&path).map(|config| (config, Some(path))),
255 pub(crate) fn from_toml(toml: &str) -> Result<Config, String> {
256 let parsed: ::toml::Value = toml
258 .map_err(|e| format!("Could not parse TOML: {}", e))?;
259 let mut err = String::new();
262 .ok_or_else(|| String::from("Parsed config was not table"))?;
263 for key in table.keys() {
264 if !Config::is_valid_name(key) {
265 let msg = &format!("Warning: Unknown configuration option `{}`\n", key);
269 match parsed.try_into() {
270 Ok(parsed_config) => {
274 Ok(Config::default().fill_from_parsed_config(parsed_config))
277 err.push_str("Error: Decoding config file failed:\n");
278 err.push_str(format!("{}\n", e).as_str());
279 err.push_str("Please check your config file.");
286 /// Loads a config by checking the client-supplied options and if appropriate, the
287 /// file system (including searching the file system for overrides).
288 pub fn load_config<O: CliOptions>(
289 file_path: Option<&Path>,
291 ) -> Result<(Config, Option<PathBuf>), Error> {
292 let over_ride = match options {
293 Some(ref opts) => config_path(opts)?,
297 let result = if let Some(over_ride) = over_ride {
298 Config::from_toml_path(over_ride.as_ref()).map(|p| (p, Some(over_ride.to_owned())))
299 } else if let Some(file_path) = file_path {
300 Config::from_resolved_toml_path(file_path)
302 Ok((Config::default(), None))
305 result.map(|(mut c, p)| {
306 if let Some(options) = options {
307 options.apply_to(&mut c);
313 // Check for the presence of known config file names (`rustfmt.toml, `.rustfmt.toml`) in `dir`
315 // Return the path if a config file exists, empty if no file exists, and Error for IO errors
316 fn get_toml_path(dir: &Path) -> Result<Option<PathBuf>, Error> {
317 const CONFIG_FILE_NAMES: [&str; 2] = [".rustfmt.toml", "rustfmt.toml"];
318 for config_file_name in &CONFIG_FILE_NAMES {
319 let config_file = dir.join(config_file_name);
320 match fs::metadata(&config_file) {
321 // Only return if it's a file to handle the unlikely situation of a directory named
323 Ok(ref md) if md.is_file() => return Ok(Some(config_file)),
324 // Return the error if it's something other than `NotFound`; otherwise we didn't
325 // find the project file yet, and continue searching.
327 if e.kind() != ErrorKind::NotFound {
337 fn config_path(options: &dyn CliOptions) -> Result<Option<PathBuf>, Error> {
338 let config_path_not_found = |path: &str| -> Result<Option<PathBuf>, Error> {
342 "Error: unable to find a config file for the given path: `{}`",
348 // Read the config_path and convert to parent dir if a file is provided.
349 // If a config file cannot be found from the given path, return error.
350 match options.config_path() {
351 Some(path) if !path.exists() => config_path_not_found(path.to_str().unwrap()),
352 Some(path) if path.is_dir() => {
353 let config_file_path = get_toml_path(path)?;
354 if config_file_path.is_some() {
357 config_path_not_found(path.to_str().unwrap())
360 path => Ok(path.map(ToOwned::to_owned)),
374 // Options that are used by the generated functions
375 max_width: usize, 100, true, "Maximum width of each line";
376 use_small_heuristics: Heuristics, Heuristics::Default, true,
377 "Whether to use different formatting for items and \
378 expressions if they satisfy a heuristic notion of 'small'.";
379 license_template_path: String, String::default(), false,
380 "Beginning of file must match license template";
381 required_version: String, env!("CARGO_PKG_VERSION").to_owned(), false,
382 "Require a specific version of rustfmt.";
383 ignore: IgnoreList, IgnoreList::default(), false,
384 "Skip formatting the specified files and directories.";
385 verbose: Verbosity, Verbosity::Normal, false,
386 "How much to information to emit to the user";
387 file_lines: FileLines, FileLines::all(), false,
388 "Lines to format; this is not supported in rustfmt.toml, and can only be specified \
389 via the --file-lines option";
390 width_heuristics: WidthHeuristics, WidthHeuristics::scaled(100), false,
391 "'small' heuristic values";
393 // Options that are used by the tests
394 stable_option: bool, false, true, "A stable option";
395 unstable_option: bool, false, false, "An unstable option";
400 fn test_config_set() {
401 let mut config = Config::default();
402 config.set().verbose(Verbosity::Quiet);
403 assert_eq!(config.verbose(), Verbosity::Quiet);
404 config.set().verbose(Verbosity::Normal);
405 assert_eq!(config.verbose(), Verbosity::Normal);
409 fn test_config_used_to_toml() {
410 let config = Config::default();
412 let merge_derives = config.merge_derives();
413 let skip_children = config.skip_children();
415 let used_options = config.used_options();
416 let toml = used_options.to_toml().unwrap();
420 "merge_derives = {}\nskip_children = {}\n",
421 merge_derives, skip_children,
428 let config = Config::from_toml("hard_tabs = true").unwrap();
430 assert_eq!(config.was_set().hard_tabs(), true);
431 assert_eq!(config.was_set().verbose(), false);
435 fn test_print_docs_exclude_unstable() {
436 use self::mock::Config;
438 let mut output = Vec::new();
439 Config::print_docs(&mut output, false);
441 let s = str::from_utf8(&output).unwrap();
443 assert_eq!(s.contains("stable_option"), true);
444 assert_eq!(s.contains("unstable_option"), false);
445 assert_eq!(s.contains("(unstable)"), false);
449 fn test_print_docs_include_unstable() {
450 use self::mock::Config;
452 let mut output = Vec::new();
453 Config::print_docs(&mut output, true);
455 let s = str::from_utf8(&output).unwrap();
456 assert_eq!(s.contains("stable_option"), true);
457 assert_eq!(s.contains("unstable_option"), true);
458 assert_eq!(s.contains("(unstable)"), true);
461 // FIXME(#2183): these tests cannot be run in parallel because they use env vars.
463 // fn test_as_not_nightly_channel() {
464 // let mut config = Config::default();
465 // assert_eq!(config.was_set().unstable_features(), false);
466 // config.set().unstable_features(true);
467 // assert_eq!(config.was_set().unstable_features(), false);
471 // fn test_as_nightly_channel() {
472 // let v = ::std::env::var("CFG_RELEASE_CHANNEL").unwrap_or(String::from(""));
473 // ::std::env::set_var("CFG_RELEASE_CHANNEL", "nightly");
474 // let mut config = Config::default();
475 // config.set().unstable_features(true);
476 // assert_eq!(config.was_set().unstable_features(), false);
477 // config.set().unstable_features(true);
478 // assert_eq!(config.unstable_features(), true);
479 // ::std::env::set_var("CFG_RELEASE_CHANNEL", v);
483 // fn test_unstable_from_toml() {
484 // let mut config = Config::from_toml("unstable_features = true").unwrap();
485 // assert_eq!(config.was_set().unstable_features(), false);
486 // let v = ::std::env::var("CFG_RELEASE_CHANNEL").unwrap_or(String::from(""));
487 // ::std::env::set_var("CFG_RELEASE_CHANNEL", "nightly");
488 // config = Config::from_toml("unstable_features = true").unwrap();
489 // assert_eq!(config.was_set().unstable_features(), true);
490 // assert_eq!(config.unstable_features(), true);
491 // ::std::env::set_var("CFG_RELEASE_CHANNEL", v);