Add configuration to lint missing docs of pub(crate) items

clippy_lints/src/lib.rs

@@ -665,12 +665,13 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         ))
     });
     let doc_valid_idents = conf.doc_valid_idents.iter().cloned().collect::<FxHashSet<_>>();
+    let only_check_missing_docs_in_crate_items = conf.only_check_missing_docs_in_crate_items;
     store.register_late_pass(move |_| Box::new(doc::DocMarkdown::new(doc_valid_idents.clone())));
     store.register_late_pass(|_| Box::new(neg_multiply::NegMultiply));
     store.register_late_pass(|_| Box::new(mem_forget::MemForget));
     store.register_late_pass(|_| Box::new(let_if_seq::LetIfSeq));
     store.register_late_pass(|_| Box::new(mixed_read_write_in_expression::EvalOrderDependence));
-    store.register_late_pass(|_| Box::new(missing_doc::MissingDoc::new()));
+    store.register_late_pass(move |_| Box::new(missing_doc::MissingDoc::new(only_check_missing_docs_in_crate_items)));
     store.register_late_pass(|_| Box::new(missing_inline::MissingInline));
     store.register_late_pass(move |_| Box::new(exhaustive_items::ExhaustiveItems));
     store.register_late_pass(|_| Box::new(match_result_ok::MatchResultOk));

clippy_lints/src/missing_doc.rs

@@ -12,7 +12,7 @@ use if_chain::if_chain;
 use rustc_ast::ast::{self, MetaItem, MetaItemKind};
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
-use rustc_middle::ty::DefIdTree;
+use rustc_middle::ty::{DefIdTree, Visibility};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::def_id::CRATE_DEF_ID;
 use rustc_span::source_map::Span;
@@ -35,6 +35,8 @@ declare_clippy_lint! {
 }
 
 pub struct MissingDoc {
+    /// FIXME: docs
+    crate_items_only: bool,
     /// Stack of whether #[doc(hidden)] is set
     /// at each level which has lint attributes.
     doc_hidden_stack: Vec<bool>,
@@ -43,14 +45,15 @@ pub struct MissingDoc {
 impl Default for MissingDoc {
     #[must_use]
     fn default() -> Self {
-        Self::new()
+        Self::new(false)
     }
 }
 
 impl MissingDoc {
     #[must_use]
-    pub fn new() -> Self {
+    pub fn new(crate_items_only: bool) -> Self {
         Self {
+            crate_items_only,
             doc_hidden_stack: vec![false],
         }
     }
@@ -128,6 +131,13 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
     }
 
     fn check_item(&mut self, cx: &LateContext<'tcx>, it: &'tcx hir::Item<'_>) {
+        if self.crate_items_only {
+            let vis = cx.tcx.visibility(it.owner_id.to_def_id());
+            if vis != Visibility::Public && vis != Visibility::Restricted(CRATE_DEF_ID.into()) {
+                return;
+            }
+        }
+
         match it.kind {
             hir::ItemKind::Fn(..) => {
                 // ignore main()

clippy_lints/src/utils/conf.rs

@@ -454,6 +454,10 @@ define_Conf! {
     /// configuration will cause restriction lints to trigger even
     /// if no suggestion can be made.
     (suppress_restriction_lint_in_const: bool = false),
+    /// Lint: MISSING_DOCS_IN_PRIVATE_ITEMS.
+    ///
+    /// FIXME: docs
+    (only_check_missing_docs_in_crate_items: bool = false),
 }
 
 /// Search for the configuration file.

tests/ui-toml/pub_crate_missing_docs/clippy.toml

@@ -0,0 +1 @@
+only-check-missing-docs-in-crate-items = true

tests/ui-toml/pub_crate_missing_docs/pub_crate_missing_doc.rs

@@ -0,0 +1,32 @@
+//! this is crate
+#![warn(clippy::missing_docs_in_private_items)]
+
+/// this is mod
+mod my_mod {
+    /// some docs
+    fn priv_with_docs() {}
+    fn priv_no_docs() {}
+    /// some docs
+    pub(crate) fn crate_with_docs() {}
+    pub(crate) fn crate_no_docs() {}
+    /// some docs
+    pub(super) fn super_with_docs() {}
+    pub(super) fn super_no_docs() {}
+
+    mod my_sub {
+        /// some docs
+        fn sub_priv_with_docs() {}
+        fn sub_priv_no_docs() {}
+        /// some docs
+        pub(crate) fn sub_crate_with_docs() {}
+        pub(crate) fn sub_crate_no_docs() {}
+        /// some docs
+        pub(super) fn sub_super_with_docs() {}
+        pub(super) fn sub_super_no_docs() {}
+    }
+}
+
+fn main() {
+    my_mod::crate_with_docs();
+    my_mod::crate_no_docs();
+}

tests/ui-toml/pub_crate_missing_docs/pub_crate_missing_doc.stderr

@@ -0,0 +1,22 @@
+error: missing documentation for a function
+  --> $DIR/pub_crate_missing_doc.rs:11:5
+   |
+LL |     pub(crate) fn crate_no_docs() {}
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D clippy::missing-docs-in-private-items` implied by `-D warnings`
+
+error: missing documentation for a function
+  --> $DIR/pub_crate_missing_doc.rs:14:5
+   |
+LL |     pub(super) fn super_no_docs() {}
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: missing documentation for a function
+  --> $DIR/pub_crate_missing_doc.rs:22:9
+   |
+LL |         pub(crate) fn sub_crate_no_docs() {}
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+