1 use itertools::Itertools;
3 use std::collections::HashMap;
6 use std::lazy::SyncLazy;
10 use crate::clippy_project_root;
12 const GENERATED_FILE_COMMENT: &str = "// This file was generated by `cargo dev update_lints`.\n\
13 // Use that command to update this file and do not edit by hand.\n\
14 // Manual edits will be overwritten.\n\n";
16 static DEC_CLIPPY_LINT_RE: SyncLazy<Regex> = SyncLazy::new(|| {
19 declare_clippy_lint!\s*[\{(]
21 \s+pub\s+(?P<name>[A-Z_][A-Z_0-9]*)\s*,\s*
22 (?P<cat>[a-z_]+)\s*,\s*
23 "(?P<desc>(?:[^"\\]+|\\(?s).(?-s))*)"\s*[})]
29 static DEC_DEPRECATED_LINT_RE: SyncLazy<Regex> = SyncLazy::new(|| {
32 declare_deprecated_lint!\s*[{(]\s*
34 \s+pub\s+(?P<name>[A-Z_][A-Z_0-9]*)\s*,\s*
35 "(?P<desc>(?:[^"\\]+|\\(?s).(?-s))*)"\s*[})]
40 static NL_ESCAPE_RE: SyncLazy<Regex> = SyncLazy::new(|| Regex::new(r#"\\\n\s*"#).unwrap());
42 static DOCS_LINK: &str = "https://rust-lang.github.io/rust-clippy/master/index.html";
44 #[derive(Clone, Copy, PartialEq)]
50 /// Runs the `update_lints` command.
52 /// This updates various generated values from the lint source code.
54 /// `update_mode` indicates if the files should be updated or if updates should be checked for.
58 /// Panics if a file path could not read from or then written to
59 #[allow(clippy::too_many_lines)]
60 pub fn run(update_mode: UpdateMode) {
61 let lint_list: Vec<Lint> = gather_all().collect();
63 let internal_lints = Lint::internal_lints(&lint_list);
64 let deprecated_lints = Lint::deprecated_lints(&lint_list);
65 let usable_lints = Lint::usable_lints(&lint_list);
66 let mut sorted_usable_lints = usable_lints.clone();
67 sorted_usable_lints.sort_by_key(|lint| lint.name.clone());
69 let usable_lint_count = round_to_fifty(usable_lints.len());
71 let mut file_change = false;
73 file_change |= replace_region_in_file(
74 Path::new("README.md"),
76 r#"\[There are over \d+ lints included in this crate!\]\({}\)"#,
81 update_mode == UpdateMode::Change,
84 "[There are over {} lints included in this crate!]({})",
85 usable_lint_count, DOCS_LINK
91 file_change |= replace_region_in_file(
92 Path::new("CHANGELOG.md"),
93 "<!-- begin autogenerated links to lint list -->",
94 "<!-- end autogenerated links to lint list -->",
96 update_mode == UpdateMode::Change,
97 || gen_changelog_lint_list(usable_lints.iter().chain(deprecated_lints.iter())),
101 // This has to be in lib.rs, otherwise rustfmt doesn't work
102 file_change |= replace_region_in_file(
103 Path::new("clippy_lints/src/lib.rs"),
104 "begin lints modules",
107 update_mode == UpdateMode::Change,
108 || gen_modules_list(usable_lints.iter()),
112 if file_change && update_mode == UpdateMode::Check {
117 "clippy_lints/src/lib.register_lints.rs",
119 &gen_register_lint_list(internal_lints.iter(), usable_lints.iter()),
122 "clippy_lints/src/lib.deprecated.rs",
124 &gen_deprecated(deprecated_lints.iter()),
127 let all_group_lints = usable_lints.iter().filter(|l| {
130 "correctness" | "suspicious" | "style" | "complexity" | "perf"
133 let content = gen_lint_group_list("all", all_group_lints);
134 process_file("clippy_lints/src/lib.register_all.rs", update_mode, &content);
136 for (lint_group, lints) in Lint::by_lint_group(usable_lints.into_iter().chain(internal_lints)) {
137 let content = gen_lint_group_list(&lint_group, lints.iter());
139 &format!("clippy_lints/src/lib.register_{}.rs", lint_group),
146 pub fn print_lints() {
147 let lint_list: Vec<Lint> = gather_all().collect();
148 let usable_lints = Lint::usable_lints(&lint_list);
149 let usable_lint_count = usable_lints.len();
150 let grouped_by_lint_group = Lint::by_lint_group(usable_lints.into_iter());
152 for (lint_group, mut lints) in grouped_by_lint_group {
153 if lint_group == "Deprecated" {
156 println!("\n## {}", lint_group);
158 lints.sort_by_key(|l| l.name.clone());
161 println!("* [{}]({}#{}) ({})", lint.name, DOCS_LINK, lint.name, lint.desc);
165 println!("there are {} lints", usable_lint_count);
168 fn round_to_fifty(count: usize) -> usize {
172 fn process_file(path: impl AsRef<Path>, update_mode: UpdateMode, content: &str) {
173 if update_mode == UpdateMode::Check {
175 fs::read_to_string(&path).unwrap_or_else(|e| panic!("Cannot read from {}: {}", path.as_ref().display(), e));
176 if content != old_content {
180 fs::write(&path, content.as_bytes())
181 .unwrap_or_else(|e| panic!("Cannot write to {}: {}", path.as_ref().display(), e));
185 fn exit_with_failure() {
187 "Not all lints defined properly. \
188 Please run `cargo dev update_lints` to make sure all lints are defined properly."
190 std::process::exit(1);
193 /// Lint data parsed from the Clippy source code.
194 #[derive(Clone, PartialEq, Debug)]
199 deprecation: Option<String>,
205 fn new(name: &str, group: &str, desc: &str, deprecation: Option<&str>, module: &str) -> Self {
207 name: name.to_lowercase(),
208 group: group.to_string(),
209 desc: NL_ESCAPE_RE.replace(&desc.replace("\\\"", "\""), "").to_string(),
210 deprecation: deprecation.map(ToString::to_string),
211 module: module.to_string(),
215 /// Returns all non-deprecated lints and non-internal lints
217 fn usable_lints(lints: &[Self]) -> Vec<Self> {
220 .filter(|l| l.deprecation.is_none() && !l.group.starts_with("internal"))
225 /// Returns all internal lints (not `internal_warn` lints)
227 fn internal_lints(lints: &[Self]) -> Vec<Self> {
228 lints.iter().filter(|l| l.group == "internal").cloned().collect()
231 /// Returns all deprecated lints
233 fn deprecated_lints(lints: &[Self]) -> Vec<Self> {
234 lints.iter().filter(|l| l.deprecation.is_some()).cloned().collect()
237 /// Returns the lints in a `HashMap`, grouped by the different lint groups
239 fn by_lint_group(lints: impl Iterator<Item = Self>) -> HashMap<String, Vec<Self>> {
240 lints.map(|lint| (lint.group.to_string(), lint)).into_group_map()
244 /// Generates the code for registering a group
245 fn gen_lint_group_list<'a>(group_name: &str, lints: impl Iterator<Item = &'a Lint>) -> String {
246 let mut details: Vec<_> = lints.map(|l| (&l.module, l.name.to_uppercase())).collect();
247 details.sort_unstable();
249 let mut output = GENERATED_FILE_COMMENT.to_string();
251 output.push_str(&format!(
252 "store.register_group(true, \"clippy::{0}\", Some(\"clippy_{0}\"), vec![\n",
255 for (module, name) in details {
256 output.push_str(&format!(" LintId::of({}::{}),\n", module, name));
258 output.push_str("])\n");
263 /// Generates the module declarations for `lints`
265 fn gen_modules_list<'a>(lints: impl Iterator<Item = &'a Lint>) -> Vec<String> {
269 .map(|module| format!("mod {};", module))
271 .collect::<Vec<String>>()
274 /// Generates the list of lint links at the bottom of the CHANGELOG
276 fn gen_changelog_lint_list<'a>(lints: impl Iterator<Item = &'a Lint>) -> Vec<String> {
278 .sorted_by_key(|l| &l.name)
279 .map(|l| format!("[`{}`]: {}#{}", l.name, DOCS_LINK, l.name))
283 /// Generates the `register_removed` code
285 fn gen_deprecated<'a>(lints: impl Iterator<Item = &'a Lint>) -> String {
286 let mut output = GENERATED_FILE_COMMENT.to_string();
287 output.push_str("{\n");
288 for Lint { name, deprecation, .. } in lints {
289 output.push_str(&format!(
291 " store.register_removed(\n",
292 " \"clippy::{}\",\n",
297 deprecation.as_ref().expect("`lints` are deprecated")
300 output.push_str("}\n");
305 /// Generates the code for registering lints
307 fn gen_register_lint_list<'a>(
308 internal_lints: impl Iterator<Item = &'a Lint>,
309 usable_lints: impl Iterator<Item = &'a Lint>,
311 let mut details: Vec<_> = internal_lints
312 .map(|l| (false, &l.module, l.name.to_uppercase()))
313 .chain(usable_lints.map(|l| (true, &l.module, l.name.to_uppercase())))
315 details.sort_unstable();
317 let mut output = GENERATED_FILE_COMMENT.to_string();
318 output.push_str("store.register_lints(&[\n");
320 for (is_public, module_name, lint_name) in details {
322 output.push_str(" #[cfg(feature = \"internal-lints\")]\n");
324 output.push_str(&format!(" {}::{},\n", module_name, lint_name));
326 output.push_str("])\n");
331 /// Gathers all files in `src/clippy_lints` and gathers all lints inside
332 fn gather_all() -> impl Iterator<Item = Lint> {
333 lint_files().flat_map(|f| gather_from_file(&f))
336 fn gather_from_file(dir_entry: &walkdir::DirEntry) -> impl Iterator<Item = Lint> {
337 let content = fs::read_to_string(dir_entry.path()).unwrap();
338 let path = dir_entry.path();
339 let filename = path.file_stem().unwrap();
340 let path_buf = path.with_file_name(filename);
341 let mut rel_path = path_buf
342 .strip_prefix(clippy_project_root().join("clippy_lints/src"))
343 .expect("only files in `clippy_lints/src` should be looked at");
344 // If the lints are stored in mod.rs, we get the module name from
345 // the containing directory:
346 if filename == "mod" {
347 rel_path = rel_path.parent().unwrap();
350 let module = rel_path
352 .map(|c| c.as_os_str().to_str().unwrap())
356 parse_contents(&content, &module)
359 fn parse_contents(content: &str, module: &str) -> impl Iterator<Item = Lint> {
360 let lints = DEC_CLIPPY_LINT_RE
361 .captures_iter(content)
362 .map(|m| Lint::new(&m["name"], &m["cat"], &m["desc"], None, module));
363 let deprecated = DEC_DEPRECATED_LINT_RE
364 .captures_iter(content)
365 .map(|m| Lint::new(&m["name"], "Deprecated", &m["desc"], Some(&m["desc"]), module));
366 // Removing the `.collect::<Vec<Lint>>().into_iter()` causes some lifetime issues due to the map
367 lints.chain(deprecated).collect::<Vec<Lint>>().into_iter()
370 /// Collects all .rs files in the `clippy_lints/src` directory
371 fn lint_files() -> impl Iterator<Item = walkdir::DirEntry> {
372 // We use `WalkDir` instead of `fs::read_dir` here in order to recurse into subdirectories.
373 // Otherwise we would not collect all the lints, for example in `clippy_lints/src/methods/`.
374 let path = clippy_project_root().join("clippy_lints/src");
377 .filter_map(Result::ok)
378 .filter(|f| f.path().extension() == Some(OsStr::new("rs")))
381 /// Whether a file has had its text changed or not
382 #[derive(PartialEq, Debug)]
388 /// Replaces a region in a file delimited by two lines matching regexes.
390 /// `path` is the relative path to the file on which you want to perform the replacement.
392 /// See `replace_region_in_text` for documentation of the other options.
396 /// Panics if the path could not read or then written
397 fn replace_region_in_file<F>(
406 F: FnOnce() -> Vec<String>,
408 let contents = fs::read_to_string(path).unwrap_or_else(|e| panic!("Cannot read from {}: {}", path.display(), e));
409 let file_change = replace_region_in_text(&contents, start, end, replace_start, replacements);
412 if let Err(e) = fs::write(path, file_change.new_lines.as_bytes()) {
413 panic!("Cannot write to {}: {}", path.display(), e);
419 /// Replaces a region in a text delimited by two lines matching regexes.
421 /// * `text` is the input text on which you want to perform the replacement
422 /// * `start` is a `&str` that describes the delimiter line before the region you want to replace.
423 /// As the `&str` will be converted to a `Regex`, this can contain regex syntax, too.
424 /// * `end` is a `&str` that describes the delimiter line until where the replacement should happen.
425 /// As the `&str` will be converted to a `Regex`, this can contain regex syntax, too.
426 /// * If `replace_start` is true, the `start` delimiter line is replaced as well. The `end`
427 /// delimiter line is never replaced.
428 /// * `replacements` is a closure that has to return a `Vec<String>` which contains the new text.
430 /// If you want to perform the replacement on files instead of already parsed text,
431 /// use `replace_region_in_file`.
436 /// let the_text = "replace_start\nsome text\nthat will be replaced\nreplace_end";
438 /// replace_region_in_text(the_text, "replace_start", "replace_end", false, || {
439 /// vec!["a different".to_string(), "text".to_string()]
442 /// assert_eq!("replace_start\na different\ntext\nreplace_end", result);
447 /// Panics if start or end is not valid regex
448 fn replace_region_in_text<F>(text: &str, start: &str, end: &str, replace_start: bool, replacements: F) -> FileChange
450 F: FnOnce() -> Vec<String>,
452 let replace_it = replacements();
453 let mut in_old_region = false;
454 let mut found = false;
455 let mut new_lines = vec![];
456 let start = Regex::new(start).unwrap();
457 let end = Regex::new(end).unwrap();
459 for line in text.lines() {
461 if end.is_match(line) {
462 in_old_region = false;
463 new_lines.extend(replace_it.clone());
464 new_lines.push(line.to_string());
466 } else if start.is_match(line) {
468 new_lines.push(line.to_string());
470 in_old_region = true;
473 new_lines.push(line.to_string());
478 // This happens if the provided regex in `clippy_dev/src/main.rs` does not match in the
479 // given text or file. Most likely this is an error on the programmer's side and the Regex
481 eprintln!("error: regex \n{:?}\ndoesn't match. You may have to update it.", start);
482 std::process::exit(1);
485 let mut new_lines = new_lines.join("\n");
486 if text.ends_with('\n') {
487 new_lines.push('\n');
489 let changed = new_lines != text;
490 FileChange { changed, new_lines }
494 fn test_parse_contents() {
495 let result: Vec<Lint> = parse_contents(
497 declare_clippy_lint! {
504 declare_clippy_lint!{
511 declare_deprecated_lint! {
512 pub SHOULD_ASSERT_EQ,
513 "`assert!()` will be more flexible with RFC 2011"
521 Lint::new("ptr_arg", "style", "really long text", None, "module_name"),
522 Lint::new("doc_markdown", "pedantic", "single line", None, "module_name"),
526 "`assert!()` will be more flexible with RFC 2011",
527 Some("`assert!()` will be more flexible with RFC 2011"),
531 assert_eq!(expected, result);
539 fn test_replace_region() {
540 let text = "\nabc\n123\n789\ndef\nghi";
541 let expected = FileChange {
543 new_lines: "\nabc\nhello world\ndef\nghi".to_string(),
545 let result = replace_region_in_text(text, r#"^\s*abc$"#, r#"^\s*def"#, false, || {
546 vec!["hello world".to_string()]
548 assert_eq!(expected, result);
552 fn test_replace_region_with_start() {
553 let text = "\nabc\n123\n789\ndef\nghi";
554 let expected = FileChange {
556 new_lines: "\nhello world\ndef\nghi".to_string(),
558 let result = replace_region_in_text(text, r#"^\s*abc$"#, r#"^\s*def"#, true, || {
559 vec!["hello world".to_string()]
561 assert_eq!(expected, result);
565 fn test_replace_region_no_changes() {
566 let text = "123\n456\n789";
567 let expected = FileChange {
569 new_lines: "123\n456\n789".to_string(),
571 let result = replace_region_in_text(text, r#"^\s*123$"#, r#"^\s*456"#, false, Vec::new);
572 assert_eq!(expected, result);
576 fn test_usable_lints() {
578 Lint::new("should_assert_eq", "Deprecated", "abc", Some("Reason"), "module_name"),
579 Lint::new("should_assert_eq2", "Not Deprecated", "abc", None, "module_name"),
580 Lint::new("should_assert_eq2", "internal", "abc", None, "module_name"),
581 Lint::new("should_assert_eq2", "internal_style", "abc", None, "module_name"),
583 let expected = vec![Lint::new(
590 assert_eq!(expected, Lint::usable_lints(&lints));
594 fn test_by_lint_group() {
596 Lint::new("should_assert_eq", "group1", "abc", None, "module_name"),
597 Lint::new("should_assert_eq2", "group2", "abc", None, "module_name"),
598 Lint::new("incorrect_match", "group1", "abc", None, "module_name"),
600 let mut expected: HashMap<String, Vec<Lint>> = HashMap::new();
602 "group1".to_string(),
604 Lint::new("should_assert_eq", "group1", "abc", None, "module_name"),
605 Lint::new("incorrect_match", "group1", "abc", None, "module_name"),
609 "group2".to_string(),
610 vec![Lint::new("should_assert_eq2", "group2", "abc", None, "module_name")],
612 assert_eq!(expected, Lint::by_lint_group(lints.into_iter()));
616 fn test_gen_changelog_lint_list() {
618 Lint::new("should_assert_eq", "group1", "abc", None, "module_name"),
619 Lint::new("should_assert_eq2", "group2", "abc", None, "module_name"),
622 format!("[`should_assert_eq`]: {}#should_assert_eq", DOCS_LINK.to_string()),
623 format!("[`should_assert_eq2`]: {}#should_assert_eq2", DOCS_LINK.to_string()),
625 assert_eq!(expected, gen_changelog_lint_list(lints.iter()));
629 fn test_gen_deprecated() {
635 Some("has been superseded by should_assert_eq2"),
639 "another_deprecated",
642 Some("will be removed"),
647 let expected = GENERATED_FILE_COMMENT.to_string()
650 " store.register_removed(",
651 " \"clippy::should_assert_eq\",",
652 " \"has been superseded by should_assert_eq2\",",
654 " store.register_removed(",
655 " \"clippy::another_deprecated\",",
656 " \"will be removed\",",
663 assert_eq!(expected, gen_deprecated(lints.iter()));
668 fn test_gen_deprecated_fail() {
669 let lints = vec![Lint::new("should_assert_eq2", "group2", "abc", None, "module_name")];
670 let _deprecated_lints = gen_deprecated(lints.iter());
674 fn test_gen_modules_list() {
676 Lint::new("should_assert_eq", "group1", "abc", None, "module_name"),
677 Lint::new("incorrect_stuff", "group3", "abc", None, "another_module"),
679 let expected = vec!["mod another_module;".to_string(), "mod module_name;".to_string()];
680 assert_eq!(expected, gen_modules_list(lints.iter()));
684 fn test_gen_lint_group_list() {
686 Lint::new("abc", "group1", "abc", None, "module_name"),
687 Lint::new("should_assert_eq", "group1", "abc", None, "module_name"),
688 Lint::new("internal", "internal_style", "abc", None, "module_name"),
690 let expected = GENERATED_FILE_COMMENT.to_string()
692 "store.register_group(true, \"clippy::group1\", Some(\"clippy_group1\"), vec![",
693 " LintId::of(module_name::ABC),",
694 " LintId::of(module_name::INTERNAL),",
695 " LintId::of(module_name::SHOULD_ASSERT_EQ),",
701 let result = gen_lint_group_list("group1", lints.iter());
703 assert_eq!(expected, result);