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.
12 use std::default::Default;
14 use std::io::{Error, ErrorKind, Read};
15 use std::path::{Path, PathBuf};
30 use config::config_type::ConfigType;
31 use config::file_lines::FileLines;
32 pub use config::lists::*;
33 pub use config::options::*;
34 use config::summary::Summary;
36 /// This macro defines configuration options used in rustfmt. Each option
37 /// is defined as follows:
39 /// `name: value type, default value, is stable, description;`
42 max_width: usize, 100, true, "Maximum width of each line";
43 hard_tabs: bool, false, true, "Use tab characters for indentation, spaces for alignment";
44 tab_spaces: usize, 4, true, "Number of spaces per tab";
45 newline_style: NewlineStyle, NewlineStyle::Unix, true, "Unix or Windows line endings";
46 indent_style: IndentStyle, IndentStyle::Block, false, "How do we indent expressions or items.";
47 use_small_heuristics: bool, true, false, "Whether to use different formatting for items and \
48 expressions if they satisfy a heuristic notion of 'small'.";
50 // strings and comments
51 format_strings: bool, false, false, "Format string literals where necessary";
52 wrap_comments: bool, false, true, "Break comments to fit on the line";
53 comment_width: usize, 80, false,
54 "Maximum length of comments. No effect unless wrap_comments = true";
55 normalize_comments: bool, false, true, "Convert /* */ comments to // comments where possible";
56 license_template_path: String, String::default(), false, "Beginning of file must match license template";
58 // Single line expressions and items.
59 empty_item_single_line: bool, true, false,
60 "Put empty-body functions and impls on a single line";
61 struct_lit_single_line: bool, true, false,
62 "Put small struct literals on a single line";
63 fn_single_line: bool, false, false, "Put single-expression functions on a single line";
64 where_single_line: bool, false, false, "Force where clauses to be on a single line";
67 imports_indent: IndentStyle, IndentStyle::Visual, false, "Indent of imports";
68 imports_layout: ListTactic, ListTactic::Mixed, false, "Item layout inside a import block";
71 reorder_extern_crates: bool, true, false, "Reorder extern crate statements alphabetically";
72 reorder_extern_crates_in_group: bool, true, false, "Reorder extern crate statements in group";
73 reorder_imports: bool, true, false, "Reorder import statements alphabetically";
74 reorder_imports_in_group: bool, true, false, "Reorder import statements in group";
75 reorder_imported_names: bool, true, false,
76 "Reorder lists of names in import statements alphabetically";
77 reorder_modules: bool, true, false, "Reorder module statemtents alphabetically in group";
78 reorder_impl_items: bool, false, false, "Reorder impl items";
80 // Spaces around punctuation
81 binop_separator: SeparatorPlace, SeparatorPlace::Front, false,
82 "Where to put a binary operator when a binary expression goes multiline.";
83 type_punctuation_density: TypeDensity, TypeDensity::Wide, false,
84 "Determines if '+' or '=' are wrapped in spaces in the punctuation of types";
85 space_before_colon: bool, false, false, "Leave a space before the colon";
86 space_after_colon: bool, true, false, "Leave a space after the colon";
87 spaces_around_ranges: bool, false, false, "Put spaces around the .. and ... range operators";
88 spaces_within_parens_and_brackets: bool, false, false,
89 "Put spaces within non-empty parentheses or brackets";
92 combine_control_expr: bool, true, false, "Combine control expressions with function calls.";
93 struct_field_align_threshold: usize, 0, false, "Align struct fields if their diffs fits within \
95 remove_blank_lines_at_start_or_end_of_block: bool, true, false,
96 "Remove blank lines at start or end of a block";
97 match_arm_blocks: bool, true, false, "Wrap the body of arms in blocks when it does not fit on \
98 the same line with the pattern of arms";
99 force_multiline_blocks: bool, false, false,
100 "Force multiline closure bodies and match arms to be wrapped in a block";
101 fn_args_density: Density, Density::Tall, false, "Argument density in functions";
102 brace_style: BraceStyle, BraceStyle::SameLineWhere, false, "Brace style for items";
103 control_brace_style: ControlBraceStyle, ControlBraceStyle::AlwaysSameLine, false,
104 "Brace style for control flow constructs";
105 trailing_comma: SeparatorTactic, SeparatorTactic::Vertical, false,
106 "How to handle trailing commas for lists";
107 trailing_semicolon: bool, true, false,
108 "Add trailing semicolon after break, continue and return";
109 match_block_trailing_comma: bool, false, false,
110 "Put a trailing comma after a block based match arm (non-block arms are not affected)";
111 blank_lines_upper_bound: usize, 1, false,
112 "Maximum number of blank lines which can be put between items.";
113 blank_lines_lower_bound: usize, 0, false,
114 "Minimum number of blank lines which must be put between items.";
116 // Options that can change the source code beyond whitespace/blocks (somewhat linty things)
117 merge_derives: bool, true, true, "Merge multiple `#[derive(...)]` into a single one";
118 use_try_shorthand: bool, false, false, "Replace uses of the try! macro by the ? shorthand";
119 condense_wildcard_suffixes: bool, false, false, "Replace strings of _ wildcards by a single .. \
121 force_explicit_abi: bool, true, true, "Always print the abi for extern items";
122 use_field_init_shorthand: bool, false, false, "Use field initialization shorthand if possible";
124 // Control options (changes the operation of rustfmt, rather than the formatting)
125 write_mode: WriteMode, WriteMode::Overwrite, false,
126 "What Write Mode to use when none is supplied: \
127 Replace, Overwrite, Display, Plain, Diff, Coverage";
128 color: Color, Color::Auto, false,
129 "What Color option to use when none is supplied: Always, Never, Auto";
130 required_version: String, env!("CARGO_PKG_VERSION").to_owned(), false,
131 "Require a specific version of rustfmt.";
132 unstable_features: bool, false, true,
133 "Enables unstable features. Only available on nightly channel";
134 disable_all_formatting: bool, false, false, "Don't reformat anything";
135 skip_children: bool, false, false, "Don't reformat out of line modules";
136 hide_parse_errors: bool, false, false, "Hide errors from the parser";
137 error_on_line_overflow: bool, true, false, "Error if unable to get all lines within max_width";
138 error_on_unformatted: bool, false, false,
139 "Error if unable to get comments or string literals within max_width, \
140 or they are left with trailing whitespaces";
141 report_todo: ReportTactic, ReportTactic::Never, false,
142 "Report all, none or unnumbered occurrences of TODO in source file comments";
143 report_fixme: ReportTactic, ReportTactic::Never, false,
144 "Report all, none or unnumbered occurrences of FIXME in source file comments";
145 ignore: IgnoreList, IgnoreList::default(), false,
146 "Skip formatting the specified files and directories.";
149 verbose: bool, false, false, "Use verbose output";
150 file_lines: FileLines, FileLines::all(), false,
151 "Lines to format; this is not supported in rustfmt.toml, and can only be specified \
152 via the --file-lines option";
153 width_heuristics: WidthHeuristics, WidthHeuristics::scaled(100), false,
154 "'small' heuristic values";
157 /// Check for the presence of known config file names (`rustfmt.toml, `.rustfmt.toml`) in `dir`
159 /// Return the path if a config file exists, empty if no file exists, and Error for IO errors
160 pub fn get_toml_path(dir: &Path) -> Result<Option<PathBuf>, Error> {
161 const CONFIG_FILE_NAMES: [&str; 2] = [".rustfmt.toml", "rustfmt.toml"];
162 for config_file_name in &CONFIG_FILE_NAMES {
163 let config_file = dir.join(config_file_name);
164 match fs::metadata(&config_file) {
165 // Only return if it's a file to handle the unlikely situation of a directory named
167 Ok(ref md) if md.is_file() => return Ok(Some(config_file)),
168 // Return the error if it's something other than `NotFound`; otherwise we didn't
169 // find the project file yet, and continue searching.
171 if e.kind() != ErrorKind::NotFound {
186 fn test_config_set() {
187 let mut config = Config::default();
188 config.set().verbose(false);
189 assert_eq!(config.verbose(), false);
190 config.set().verbose(true);
191 assert_eq!(config.verbose(), true);
195 fn test_config_used_to_toml() {
196 let config = Config::default();
198 let merge_derives = config.merge_derives();
199 let skip_children = config.skip_children();
201 let used_options = config.used_options();
202 let toml = used_options.to_toml().unwrap();
206 "merge_derives = {}\nskip_children = {}\n",
207 merge_derives, skip_children,
215 let config = Config::from_toml("hard_tabs = true", Path::new("")).unwrap();
217 assert_eq!(config.was_set().hard_tabs(), true);
218 assert_eq!(config.was_set().verbose(), false);
221 // FIXME(#2183) these tests cannot be run in parallel because they use env vars
223 // fn test_as_not_nightly_channel() {
224 // let mut config = Config::default();
225 // assert_eq!(config.was_set().unstable_features(), false);
226 // config.set().unstable_features(true);
227 // assert_eq!(config.was_set().unstable_features(), false);
231 // fn test_as_nightly_channel() {
232 // let v = ::std::env::var("CFG_RELEASE_CHANNEL").unwrap_or(String::from(""));
233 // ::std::env::set_var("CFG_RELEASE_CHANNEL", "nightly");
234 // let mut config = Config::default();
235 // config.set().unstable_features(true);
236 // assert_eq!(config.was_set().unstable_features(), false);
237 // config.set().unstable_features(true);
238 // assert_eq!(config.unstable_features(), true);
239 // ::std::env::set_var("CFG_RELEASE_CHANNEL", v);
243 // fn test_unstable_from_toml() {
244 // let mut config = Config::from_toml("unstable_features = true").unwrap();
245 // assert_eq!(config.was_set().unstable_features(), false);
246 // let v = ::std::env::var("CFG_RELEASE_CHANNEL").unwrap_or(String::from(""));
247 // ::std::env::set_var("CFG_RELEASE_CHANNEL", "nightly");
248 // config = Config::from_toml("unstable_features = true").unwrap();
249 // assert_eq!(config.was_set().unstable_features(), true);
250 // assert_eq!(config.unstable_features(), true);
251 // ::std::env::set_var("CFG_RELEASE_CHANNEL", v);