1 use std::collections::{hash_set, HashSet};
3 use std::path::{Path, PathBuf};
6 use itertools::Itertools;
7 use rustfmt_config_proc_macro::config_type;
8 use serde::de::{SeqAccess, Visitor};
9 use serde::ser::SerializeSeq;
10 use serde::{Deserialize, Deserializer, Serialize, Serializer};
12 use crate::config::lists::*;
13 use crate::config::Config;
16 pub enum NewlineStyle {
17 /// Auto-detect based on the raw source input.
19 /// Force CRLF (`\r\n`).
23 /// `\r\n` in Windows, `\n`` on other platforms.
28 /// Where to put the opening brace of items (`fn`, `impl`, etc.).
30 /// Put the opening brace on the next line.
32 /// Put the opening brace on the same line, if possible.
34 /// Prefer the same line except where there is a where-clause, in which
35 /// case force the brace to be put on the next line.
40 /// Where to put the opening brace of conditional expressions (`if`, `match`, etc.).
41 pub enum ControlBraceStyle {
42 /// K&R style, Rust community default
52 pub enum IndentStyle {
53 /// First line on the same line as the opening brace, all lines aligned with
56 /// First line is on a new line and all lines align with **block** indent.
61 /// How to place a list-like items.
62 /// FIXME: Issue-3581: this should be renamed to ItemsLayout when publishing 2.0
64 /// Fit as much on one line as possible.
66 /// Items are placed horizontally if sufficient space, vertically otherwise.
68 /// Place every item on a separate line.
73 /// Spacing around type combinators.
74 pub enum TypeDensity {
75 /// No spaces around "=" and "+"
77 /// Spaces around " = " and " + "
82 /// To what extent does rustfmt pursue its heuristics?
84 /// Turn off any heuristics
86 /// Turn on max heuristics
88 /// Use Rustfmt's defaults
93 pub fn to_list_tactic(self, len: usize) -> ListTactic {
95 Density::Compressed => ListTactic::Mixed,
96 Density::Tall => ListTactic::HorizontalVertical,
97 Density::Vertical if len == 1 => ListTactic::Horizontal,
98 Density::Vertical => ListTactic::Vertical,
104 pub enum ReportTactic {
110 /// What Rustfmt should emit. Mostly corresponds to the `--emit` command line
116 /// Writes the output to stdout.
118 /// Displays how much of the input file was processed
122 /// Writes the resulting diffs in a JSON format. Returns an empty array
123 /// `[]` if there were no diffs.
125 /// Output the changed lines (for internal value only)
127 /// Checks if a diff can be generated. If so, rustfmt outputs a diff and
128 /// quits with exit code 1.
129 /// This option is designed to be run in CI where a non-zero exit signifies
130 /// non-standard code formatting. Used for `--check`.
134 /// Client-preference for coloured output.
137 /// Always use color, whether it is a piped or terminal output
141 /// Automatically use color, if supported by terminal
146 /// rustfmt format style version.
148 /// 1.x.y. When specified, rustfmt will format in the same style as 1.0.0.
150 /// 2.x.y. When specified, rustfmt will formatin the the latest style.
155 /// Whether we should use a coloured terminal.
156 pub fn use_colored_tty(self) -> bool {
158 Color::Always => true,
159 Color::Never => false,
160 Color::Auto => atty::is(atty::Stream::Stdout),
165 /// How chatty should Rustfmt be?
172 /// Emit as little as possible.
176 #[derive(Deserialize, Serialize, Clone, Debug, PartialEq)]
177 pub struct WidthHeuristics {
178 // Maximum width of the args of a function call before falling back
179 // to vertical formatting.
180 pub fn_call_width: usize,
181 // Maximum width of the args of a function-like attributes before falling
182 // back to vertical formatting.
183 pub attr_fn_like_width: usize,
184 // Maximum width in the body of a struct lit before falling back to
185 // vertical formatting.
186 pub struct_lit_width: usize,
187 // Maximum width in the body of a struct variant before falling back
188 // to vertical formatting.
189 pub struct_variant_width: usize,
190 // Maximum width of an array literal before falling back to vertical
192 pub array_width: usize,
193 // Maximum length of a chain to fit on a single line.
194 pub chain_width: usize,
195 // Maximum line length for single line if-else expressions. A value
196 // of zero means always break if-else expressions.
197 pub single_line_if_else_max_width: usize,
200 impl fmt::Display for WidthHeuristics {
201 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
202 write!(f, "{:?}", self)
206 impl WidthHeuristics {
207 // Using this WidthHeuristics means we ignore heuristics.
208 pub fn null() -> WidthHeuristics {
210 fn_call_width: usize::max_value(),
211 attr_fn_like_width: usize::max_value(),
213 struct_variant_width: 0,
214 array_width: usize::max_value(),
215 chain_width: usize::max_value(),
216 single_line_if_else_max_width: 0,
220 pub fn set(max_width: usize) -> WidthHeuristics {
222 fn_call_width: max_width,
223 attr_fn_like_width: max_width,
224 struct_lit_width: max_width,
225 struct_variant_width: max_width,
226 array_width: max_width,
227 chain_width: max_width,
228 single_line_if_else_max_width: max_width,
232 // scale the default WidthHeuristics according to max_width
233 pub fn scaled(max_width: usize) -> WidthHeuristics {
234 const DEFAULT_MAX_WIDTH: usize = 100;
235 let max_width_ratio = if max_width > DEFAULT_MAX_WIDTH {
236 let ratio = max_width as f32 / DEFAULT_MAX_WIDTH as f32;
237 // round to the closest 0.1
238 (ratio * 10.0).round() / 10.0
243 fn_call_width: (60.0 * max_width_ratio).round() as usize,
244 attr_fn_like_width: (70.0 * max_width_ratio).round() as usize,
245 struct_lit_width: (18.0 * max_width_ratio).round() as usize,
246 struct_variant_width: (35.0 * max_width_ratio).round() as usize,
247 array_width: (60.0 * max_width_ratio).round() as usize,
248 chain_width: (60.0 * max_width_ratio).round() as usize,
249 single_line_if_else_max_width: (50.0 * max_width_ratio).round() as usize,
254 impl ::std::str::FromStr for WidthHeuristics {
255 type Err = &'static str;
257 fn from_str(_: &str) -> Result<Self, Self::Err> {
258 Err("WidthHeuristics is not parsable")
262 impl Default for EmitMode {
263 fn default() -> EmitMode {
268 /// A set of directories, files and modules that rustfmt should ignore.
269 #[derive(Default, Clone, Debug, PartialEq)]
270 pub struct IgnoreList {
271 /// A set of path specified in rustfmt.toml.
272 path_set: HashSet<PathBuf>,
273 /// A path to rustfmt.toml.
274 rustfmt_toml_path: PathBuf,
277 impl fmt::Display for IgnoreList {
278 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
284 .format_with(", ", |path, f| f(&format_args!(
286 path.to_string_lossy()
292 impl Serialize for IgnoreList {
293 fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
297 let mut seq = serializer.serialize_seq(Some(self.path_set.len()))?;
298 for e in &self.path_set {
299 seq.serialize_element(e)?;
305 impl<'de> Deserialize<'de> for IgnoreList {
306 fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
308 D: Deserializer<'de>,
310 struct HashSetVisitor;
311 impl<'v> Visitor<'v> for HashSetVisitor {
312 type Value = HashSet<PathBuf>;
314 fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
315 formatter.write_str("a sequence of path")
318 fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
322 let mut path_set = HashSet::new();
323 while let Some(elem) = seq.next_element()? {
324 path_set.insert(elem);
330 path_set: deserializer.deserialize_seq(HashSetVisitor)?,
331 rustfmt_toml_path: PathBuf::new(),
336 impl<'a> IntoIterator for &'a IgnoreList {
337 type Item = &'a PathBuf;
338 type IntoIter = hash_set::Iter<'a, PathBuf>;
340 fn into_iter(self) -> Self::IntoIter {
346 pub fn add_prefix(&mut self, dir: &Path) {
347 self.rustfmt_toml_path = dir.to_path_buf();
350 pub fn rustfmt_toml_path(&self) -> &Path {
351 &self.rustfmt_toml_path
355 impl ::std::str::FromStr for IgnoreList {
356 type Err = &'static str;
358 fn from_str(_: &str) -> Result<Self, Self::Err> {
359 Err("IgnoreList is not parsable")
363 /// Maps client-supplied options to Rustfmt's internals, mostly overriding
364 /// values in a config with values from the command line.
365 pub trait CliOptions {
366 fn apply_to(self, config: &mut Config);
367 fn config_path(&self) -> Option<&Path>;
370 /// The edition of the syntax and semntics of code (RFC 2052).
383 impl Default for Edition {
384 fn default() -> Edition {
390 pub(crate) fn to_libsyntax_pos_edition(self) -> syntax_pos::edition::Edition {
392 Edition::Edition2015 => syntax_pos::edition::Edition::Edition2015,
393 Edition::Edition2018 => syntax_pos::edition::Edition::Edition2018,