Auto merge of #5156 - flip1995:dev_add_internal, r=phansch

Let update_lints also generate the internal lints

r? @phansch

changelog: none

Author: bors

clippy_dev/src/lib.rs

@@ -61,13 +61,15 @@ impl Lint {
         lints.filter(|l| l.deprecation.is_none() && !l.is_internal())
     }
 
+    /// Returns all internal lints (not `internal_warn` lints)
+    pub fn internal_lints(lints: impl Iterator<Item = Self>) -> impl Iterator<Item = Self> {
+        lints.filter(|l| l.group == "internal")
+    }
+
     /// Returns the lints in a `HashMap`, grouped by the different lint groups
     #[must_use]
-    pub fn by_lint_group(lints: &[Self]) -> HashMap<String, Vec<Self>> {
-        lints
-            .iter()
-            .map(|lint| (lint.group.to_string(), lint.clone()))
-            .into_group_map()
+    pub fn by_lint_group(lints: impl Iterator<Item = Self>) -> HashMap<String, Vec<Self>> {
+        lints.map(|lint| (lint.group.to_string(), lint)).into_group_map()
     }
 
     #[must_use]
@@ -82,7 +84,7 @@ pub fn gen_lint_group_list(lints: Vec<Lint>) -> Vec<String> {
     lints
         .into_iter()
         .filter_map(|l| {
-            if l.is_internal() || l.deprecation.is_some() {
+            if l.deprecation.is_some() {
                 None
             } else {
                 Some(format!("        LintId::of(&{}::{}),", l.module, l.name.to_uppercase()))
@@ -173,29 +175,34 @@ pub fn gather_all() -> impl Iterator<Item = Lint> {
 
 fn gather_from_file(dir_entry: &walkdir::DirEntry) -> impl Iterator<Item = Lint> {
     let content = fs::read_to_string(dir_entry.path()).unwrap();
-    let mut filename = dir_entry.path().file_stem().unwrap().to_str().unwrap();
+    let path = dir_entry.path();
+    let filename = path.file_stem().unwrap();
+    let path_buf = path.with_file_name(filename);
+    let mut rel_path = path_buf
+        .strip_prefix(clippy_project_root().join("clippy_lints/src"))
+        .expect("only files in `clippy_lints/src` should be looked at");
     // If the lints are stored in mod.rs, we get the module name from
     // the containing directory:
     if filename == "mod" {
-        filename = dir_entry
-            .path()
-            .parent()
-            .unwrap()
-            .file_stem()
-            .unwrap()
-            .to_str()
-            .unwrap()
+        rel_path = rel_path.parent().unwrap();
     }
-    parse_contents(&content, filename)
+
+    let module = rel_path
+        .components()
+        .map(|c| c.as_os_str().to_str().unwrap())
+        .collect::<Vec<_>>()
+        .join("::");
+
+    parse_contents(&content, &module)
 }
 
-fn parse_contents(content: &str, filename: &str) -> impl Iterator<Item = Lint> {
+fn parse_contents(content: &str, module: &str) -> impl Iterator<Item = Lint> {
     let lints = DEC_CLIPPY_LINT_RE
         .captures_iter(content)
-        .map(|m| Lint::new(&m["name"], &m["cat"], &m["desc"], None, filename));
+        .map(|m| Lint::new(&m["name"], &m["cat"], &m["desc"], None, module));
     let deprecated = DEC_DEPRECATED_LINT_RE
         .captures_iter(content)
-        .map(|m| Lint::new(&m["name"], "Deprecated", &m["desc"], Some(&m["desc"]), filename));
+        .map(|m| Lint::new(&m["name"], "Deprecated", &m["desc"], Some(&m["desc"]), module));
     // Removing the `.collect::<Vec<Lint>>().into_iter()` causes some lifetime issues due to the map
     lints.chain(deprecated).collect::<Vec<Lint>>().into_iter()
 }
@@ -449,7 +456,7 @@ fn test_by_lint_group() {
         "group2".to_string(),
         vec![Lint::new("should_assert_eq2", "group2", "abc", None, "module_name")],
     );
-    assert_eq!(expected, Lint::by_lint_group(&lints));
+    assert_eq!(expected, Lint::by_lint_group(lints.into_iter()));
 }
 
 #[test]
@@ -522,10 +529,11 @@ fn test_gen_lint_group_list() {
         Lint::new("abc", "group1", "abc", None, "module_name"),
         Lint::new("should_assert_eq", "group1", "abc", None, "module_name"),
         Lint::new("should_assert_eq2", "group2", "abc", Some("abc"), "deprecated"),
-        Lint::new("incorrect_internal", "internal_style", "abc", None, "module_name"),
+        Lint::new("internal", "internal_style", "abc", None, "module_name"),
     ];
     let expected = vec![
         "        LintId::of(&module_name::ABC),".to_string(),
+        "        LintId::of(&module_name::INTERNAL),".to_string(),
         "        LintId::of(&module_name::SHOULD_ASSERT_EQ),".to_string(),
     ];
     assert_eq!(expected, gen_lint_group_list(lints));

clippy_dev/src/main.rs

@@ -135,8 +135,8 @@ fn main() {
 fn print_lints() {
     let lint_list = gather_all();
     let usable_lints: Vec<Lint> = Lint::usable_lints(lint_list).collect();
-    let lint_count = usable_lints.len();
-    let grouped_by_lint_group = Lint::by_lint_group(&usable_lints);
+    let usable_lint_count = usable_lints.len();
+    let grouped_by_lint_group = Lint::by_lint_group(usable_lints.into_iter());
 
     for (lint_group, mut lints) in grouped_by_lint_group {
         if lint_group == "Deprecated" {
@@ -157,15 +157,17 @@ fn print_lints() {
         }
     }
 
-    println!("there are {} lints", lint_count);
+    println!("there are {} lints", usable_lint_count);
 }
 
 #[allow(clippy::too_many_lines)]
 fn update_lints(update_mode: UpdateMode) {
     let lint_list: Vec<Lint> = gather_all().collect();
 
+    let internal_lints = Lint::internal_lints(lint_list.clone().into_iter());
+
     let usable_lints: Vec<Lint> = Lint::usable_lints(lint_list.clone().into_iter()).collect();
-    let lint_count = usable_lints.len();
+    let usable_lint_count = usable_lints.len();
 
     let mut sorted_usable_lints = usable_lints.clone();
     sorted_usable_lints.sort_by_key(|lint| lint.name.clone());
@@ -198,7 +200,7 @@ fn update_lints(update_mode: UpdateMode) {
         || {
             vec![format!(
                 "[There are {} lints included in this crate!]({})",
-                lint_count, DOCS_LINK
+                usable_lint_count, DOCS_LINK
             )]
         },
     )
@@ -267,7 +269,7 @@ fn update_lints(update_mode: UpdateMode) {
     .changed;
 
     // Generate the list of lints for all other lint groups
-    for (lint_group, lints) in Lint::by_lint_group(&usable_lints) {
+    for (lint_group, lints) in Lint::by_lint_group(usable_lints.into_iter().chain(internal_lints)) {
         file_change |= replace_region_in_file(
             Path::new("clippy_lints/src/lib.rs"),
             &format!("store.register_group\\(true, \"clippy::{}\"", lint_group),

clippy_lints/src/lib.rs

@@ -1105,10 +1105,10 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_group(true, "clippy::internal", Some("clippy_internal"), vec![
         LintId::of(&utils::internal_lints::CLIPPY_LINTS_INTERNAL),
         LintId::of(&utils::internal_lints::COMPILER_LINT_FUNCTIONS),
+        LintId::of(&utils::internal_lints::DEFAULT_LINT),
         LintId::of(&utils::internal_lints::LINT_WITHOUT_LINT_PASS),
         LintId::of(&utils::internal_lints::OUTER_EXPN_EXPN_DATA),
         LintId::of(&utils::internal_lints::PRODUCE_ICE),
-        LintId::of(&utils::internal_lints::DEFAULT_LINT),
     ]);
 
     store.register_group(true, "clippy::all", Some("clippy"), vec![

doc/adding_lints.md

@@ -191,15 +191,15 @@ declare_lint_pass!(FooFunctions => [FOO_FUNCTIONS]);
 impl EarlyLintPass for FooFunctions {}
 ```
 
-Don't worry about the `name` method here. As long as it includes the name of the
-lint pass it should be fine.
-
-The new lint automation runs `update_lints`, which automates some things, but it
-doesn't automate everything. We will have to register our lint pass manually in
-the `register_plugins` function in `clippy_lints/src/lib.rs`:
+Normally after declaring the lint, we have to run `cargo dev update_lints`,
+which updates some files, so Clippy knows about the new lint. Since we used
+`cargo dev new_lint ...` to generate the lint declaration, this was done
+automatically. While `update_lints` automates most of the things, it doesn't
+automate everything. We will have to register our lint pass manually in the
+`register_plugins` function in `clippy_lints/src/lib.rs`:
 
 ```rust
-reg.register_early_lint_pass(box foo_functions::FooFunctions);
+store.register_early_pass(box foo_functions::FooFunctions);
 ```
 
 This should fix the `unknown clippy lint: clippy::foo_functions` error that we