Auto merge of rust-lang#11842 - GuillaumeGomez:check_private_items-config, r=blyxyas

Add new `check_private_items` config

Fixes rust-lang/rust-clippy#11742.

It adds a new configuration which allows for `MISSING_SAFETY_DOC`, `UNNECESSARY_SAFETY_DOC`, `MISSING_PANICS_DOC` and `MISSING_ERRORS_DOC` lints to run on private items.

changelog: [`missing_safety_doc`], [`unnecessary_safety_doc`], [`missing_panics_doc`], [`missing_errors_doc`]: Added the [`check-private-items`] configuration to enable lints on private items.
[rust-lang#11842](rust-lang/rust-clippy#11842)

r? `@blyxyas`

Author: bors

CHANGELOG.md

@@ -5740,4 +5740,5 @@ Released 2018-09-13
 [`absolute-paths-allowed-crates`]: https://doc.rust-lang.org/clippy/lint_configuration.html#absolute-paths-allowed-crates
 [`allowed-dotfiles`]: https://doc.rust-lang.org/clippy/lint_configuration.html#allowed-dotfiles
 [`enforce-iter-loop-reborrow`]: https://doc.rust-lang.org/clippy/lint_configuration.html#enforce-iter-loop-reborrow
+[`check-private-items`]: https://doc.rust-lang.org/clippy/lint_configuration.html#check-private-items
 <!-- end autogenerated links to configuration documentation -->

book/src/lint_configuration.md

@@ -791,3 +791,16 @@ for _ in &mut *rmvec {}
 * [`explicit_iter_loop`](https://rust-lang.github.io/rust-clippy/master/index.html#explicit_iter_loop)
 
 
+## `check-private-items`
+
+
+**Default Value:** `false`
+
+---
+**Affected lints:**
+* [`missing_safety_doc`](https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc)
+* [`unnecessary_safety_doc`](https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_safety_doc)
+* [`missing_panics_doc`](https://rust-lang.github.io/rust-clippy/master/index.html#missing_panics_doc)
+* [`missing_errors_doc`](https://rust-lang.github.io/rust-clippy/master/index.html#missing_errors_doc)
+
+

clippy_config/src/conf.rs

@@ -543,6 +543,10 @@ define_Conf! {
     /// for _ in &mut *rmvec {}
     /// ```
     (enforce_iter_loop_reborrow: bool = false),
+    /// Lint: MISSING_SAFETY_DOC, UNNECESSARY_SAFETY_DOC, MISSING_PANICS_DOC, MISSING_ERRORS_DOC
+    ///
+    /// Whether to also run the listed lints on private items.
+    (check_private_items: bool = false),
 }
 
 /// Search for the configuration file.

clippy_lints/src/doc/missing_headers.rs

@@ -15,17 +15,19 @@ pub fn check(
     headers: DocHeaders,
     body_id: Option<BodyId>,
     panic_span: Option<Span>,
+    check_private_items: bool,
 ) {
-    if !cx.effective_visibilities.is_exported(owner_id.def_id) {
+    if !check_private_items && !cx.effective_visibilities.is_exported(owner_id.def_id) {
         return; // Private functions do not require doc comments
     }
 
     // do not lint if any parent has `#[doc(hidden)]` attribute (#7347)
-    if cx
-        .tcx
-        .hir()
-        .parent_iter(owner_id.into())
-        .any(|(id, _node)| is_doc_hidden(cx.tcx.hir().attrs(id)))
+    if !check_private_items
+        && cx
+            .tcx
+            .hir()
+            .parent_iter(owner_id.into())
+            .any(|(id, _node)| is_doc_hidden(cx.tcx.hir().attrs(id)))
     {
         return;
     }

clippy_lints/src/doc/mod.rs

@@ -310,13 +310,15 @@ declare_clippy_lint! {
 pub struct DocMarkdown {
     valid_idents: FxHashSet<String>,
     in_trait_impl: bool,
+    check_private_items: bool,
 }
 
 impl DocMarkdown {
-    pub fn new(valid_idents: &[String]) -> Self {
+    pub fn new(valid_idents: &[String], check_private_items: bool) -> Self {
         Self {
             valid_idents: valid_idents.iter().cloned().collect(),
             in_trait_impl: false,
+            check_private_items,
         }
     }
 }
@@ -349,7 +351,15 @@ impl<'tcx> LateLintPass<'tcx> for DocMarkdown {
                     let body = cx.tcx.hir().body(body_id);
 
                     let panic_span = FindPanicUnwrap::find_span(cx, cx.tcx.typeck(item.owner_id), body.value);
-                    missing_headers::check(cx, item.owner_id, sig, headers, Some(body_id), panic_span);
+                    missing_headers::check(
+                        cx,
+                        item.owner_id,
+                        sig,
+                        headers,
+                        Some(body_id),
+                        panic_span,
+                        self.check_private_items,
+                    );
                 }
             },
             hir::ItemKind::Impl(impl_) => {
@@ -387,7 +397,7 @@ impl<'tcx> LateLintPass<'tcx> for DocMarkdown {
         };
         if let hir::TraitItemKind::Fn(ref sig, ..) = item.kind {
             if !in_external_macro(cx.tcx.sess, item.span) {
-                missing_headers::check(cx, item.owner_id, sig, headers, None, None);
+                missing_headers::check(cx, item.owner_id, sig, headers, None, None, self.check_private_items);
             }
         }
     }
@@ -404,7 +414,15 @@ impl<'tcx> LateLintPass<'tcx> for DocMarkdown {
             let body = cx.tcx.hir().body(body_id);
 
             let panic_span = FindPanicUnwrap::find_span(cx, cx.tcx.typeck(item.owner_id), body.value);
-            missing_headers::check(cx, item.owner_id, sig, headers, Some(body_id), panic_span);
+            missing_headers::check(
+                cx,
+                item.owner_id,
+                sig,
+                headers,
+                Some(body_id),
+                panic_span,
+                self.check_private_items,
+            );
         }
     }
 }

clippy_lints/src/lib.rs

@@ -563,6 +563,7 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
         vec_box_size_threshold,
         verbose_bit_mask_threshold,
         warn_on_all_wildcard_imports,
+        check_private_items,
 
         blacklisted_names: _,
         cyclomatic_complexity_threshold: _,
@@ -746,7 +747,7 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
             avoid_breaking_exported_api,
         ))
     });
-    store.register_late_pass(move |_| Box::new(doc::DocMarkdown::new(doc_valid_idents)));
+    store.register_late_pass(move |_| Box::new(doc::DocMarkdown::new(doc_valid_idents, check_private_items)));
     store.register_late_pass(|_| Box::new(neg_multiply::NegMultiply));
     store.register_late_pass(|_| Box::new(let_if_seq::LetIfSeq));
     store.register_late_pass(|_| Box::new(mixed_read_write_in_expression::EvalOrderDependence));

tests/ui-toml/private-doc-errors/clippy.toml

@@ -0,0 +1 @@
+check-private-items = true

tests/ui-toml/private-doc-errors/doc_lints.rs

@@ -0,0 +1,54 @@
+#![deny(
+    clippy::unnecessary_safety_doc,
+    clippy::missing_errors_doc,
+    clippy::missing_panics_doc
+)]
+
+/// This is a private function, skip to match behavior with `missing_safety_doc`.
+///
+/// # Safety
+///
+/// Boo!
+fn you_dont_see_me() {
+    //~^ ERROR: safe function's docs have unnecessary `# Safety` section
+    unimplemented!();
+}
+
+mod private_mod {
+    /// This is public but unexported function.
+    ///
+    /// # Safety
+    ///
+    /// Very safe!
+    pub fn only_crate_wide_accessible() -> Result<(), ()> {
+        //~^ ERROR: safe function's docs have unnecessary `# Safety` section
+        //~| ERROR: docs for function returning `Result` missing `# Errors` section
+        unimplemented!();
+    }
+}
+
+pub struct S;
+
+impl S {
+    /// Private, fine again to stay consistent with `missing_safety_doc`.
+    ///
+    /// # Safety
+    ///
+    /// Unnecessary!
+    fn private(&self) {
+        //~^ ERROR: safe function's docs have unnecessary `# Safety` section
+        //~| ERROR: docs for function which may panic missing `# Panics` section
+        panic!();
+    }
+}
+
+#[doc(hidden)]
+pub mod __macro {
+    pub struct T;
+    impl T {
+        pub unsafe fn f() {}
+        //~^ ERROR: unsafe function's docs miss `# Safety` section
+    }
+}
+
+fn main() {}

tests/ui-toml/private-doc-errors/doc_lints.stderr

@@ -0,0 +1,64 @@
+error: safe function's docs have unnecessary `# Safety` section
+  --> $DIR/doc_lints.rs:12:1
+   |
+LL | fn you_dont_see_me() {
+   | ^^^^^^^^^^^^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/doc_lints.rs:2:5
+   |
+LL |     clippy::unnecessary_safety_doc,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: safe function's docs have unnecessary `# Safety` section
+  --> $DIR/doc_lints.rs:23:5
+   |
+LL |     pub fn only_crate_wide_accessible() -> Result<(), ()> {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: docs for function returning `Result` missing `# Errors` section
+  --> $DIR/doc_lints.rs:23:5
+   |
+LL |     pub fn only_crate_wide_accessible() -> Result<(), ()> {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/doc_lints.rs:3:5
+   |
+LL |     clippy::missing_errors_doc,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: safe function's docs have unnecessary `# Safety` section
+  --> $DIR/doc_lints.rs:38:5
+   |
+LL |     fn private(&self) {
+   |     ^^^^^^^^^^^^^^^^^
+
+error: docs for function which may panic missing `# Panics` section
+  --> $DIR/doc_lints.rs:38:5
+   |
+LL |     fn private(&self) {
+   |     ^^^^^^^^^^^^^^^^^
+   |
+note: first possible panic found here
+  --> $DIR/doc_lints.rs:41:9
+   |
+LL |         panic!();
+   |         ^^^^^^^^
+note: the lint level is defined here
+  --> $DIR/doc_lints.rs:4:5
+   |
+LL |     clippy::missing_panics_doc
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: unsafe function's docs miss `# Safety` section
+  --> $DIR/doc_lints.rs:49:9
+   |
+LL |         pub unsafe fn f() {}
+   |         ^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D clippy::missing-safety-doc` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::missing_safety_doc)]`
+
+error: aborting due to 6 previous errors
+

tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr

@@ -21,6 +21,7 @@ error: error reading Clippy's configuration file: unknown field `foobar`, expect
            await-holding-invalid-types
            blacklisted-names
            cargo-ignore-publish
+           check-private-items
            cognitive-complexity-threshold
            cyclomatic-complexity-threshold
            disallowed-macros
@@ -95,6 +96,7 @@ error: error reading Clippy's configuration file: unknown field `barfoo`, expect
            await-holding-invalid-types
            blacklisted-names
            cargo-ignore-publish
+           check-private-items
            cognitive-complexity-threshold
            cyclomatic-complexity-threshold
            disallowed-macros