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