bugfix : skip doc(hidden) default members

fixes  rust-lang#14957

Author: alibektas

crates/ide-assists/src/handlers/add_missing_impl_members.rs

@@ -43,6 +43,7 @@ pub(crate) fn add_missing_impl_members(acc: &mut Assists, ctx: &AssistContext<'_
         acc,
         ctx,
         DefaultMethods::No,
+        true,
         "add_impl_missing_members",
         "Implement missing members",
     )
@@ -87,6 +88,7 @@ pub(crate) fn add_missing_default_members(
         acc,
         ctx,
         DefaultMethods::Only,
+        true,
         "add_impl_default_members",
         "Implement default members",
     )
@@ -96,6 +98,7 @@ fn add_missing_impl_members_inner(
     acc: &mut Assists,
     ctx: &AssistContext<'_>,
     mode: DefaultMethods,
+    ignore_hidden: bool,
     assist_id: &'static str,
     label: &'static str,
 ) -> Option<()> {
@@ -119,6 +122,7 @@ fn add_missing_impl_members_inner(
         &ctx.sema,
         &ide_db::traits::get_missing_assoc_items(&ctx.sema, &impl_def),
         mode,
+        ignore_hidden,
     );
 
     if missing_items.is_empty() {
@@ -1966,4 +1970,39 @@ impl AnotherTrait<i32> for () {
 "#,
         );
     }
+
+    #[test]
+    fn doc_hidden_default_impls_ignored() {
+        check_assist(
+            add_missing_default_members,
+            r#"
+struct Foo;
+trait Trait {
+    #[doc(hidden)]
+    fn func_with_default_impl() -> u32 {
+        42
+    }
+    fn another_default_impl() -> u32 {
+        43
+    }
+}
+impl Tra$0it for Foo {}"#,
+            r#"
+struct Foo;
+trait Trait {
+    #[doc(hidden)]
+    fn func_with_default_impl() -> u32 {
+        42
+    }
+    fn another_default_impl() -> u32 {
+        43
+    }
+}
+impl Trait for Foo {
+    $0fn another_default_impl() -> u32 {
+        43
+    }
+}"#,
+        )
+    }
 }

crates/ide-assists/src/handlers/replace_derive_with_manual_impl.rs

@@ -172,7 +172,7 @@ fn impl_def_from_trait(
 ) -> Option<(ast::Impl, ast::AssocItem)> {
     let trait_ = trait_?;
     let target_scope = sema.scope(annotated_name.syntax())?;
-    let trait_items = filter_assoc_items(sema, &trait_.items(sema.db), DefaultMethods::No);
+    let trait_items = filter_assoc_items(sema, &trait_.items(sema.db), DefaultMethods::No, true);
     if trait_items.is_empty() {
         return None;
     }

crates/ide-assists/src/utils.rs

@@ -3,7 +3,7 @@
 use std::ops;
 
 pub(crate) use gen_trait_fn_body::gen_trait_fn_body;
-use hir::{db::HirDatabase, HirDisplay, InFile, Semantics};
+use hir::{db::HirDatabase, HasAttrs as HirHasAttrs, HirDisplay, InFile, Semantics};
 use ide_db::{
     famous_defs::FamousDefs, path_transform::PathTransform,
     syntax_helpers::insert_whitespace_into_node::insert_ws_into, RootDatabase, SnippetCap,
@@ -94,16 +94,44 @@ pub fn filter_assoc_items(
     sema: &Semantics<'_, RootDatabase>,
     items: &[hir::AssocItem],
     default_methods: DefaultMethods,
+    ignore_hidden: bool,
 ) -> Vec<InFile<ast::AssocItem>> {
+    // FIXME : How to use the closure below  this so I can write sth like
+    // sema.source(hide(it)?)?...
+
+    // let hide = |it: impl HasAttrs| {
+    //     if default_methods == DefaultMethods::IgnoreHidden && it.attrs(sema.db).has_doc_hidden() {
+    //         None;
+    //     }
+    //     Some(it)
+    // };
+
     return items
         .iter()
         // Note: This throws away items with no source.
         .copied()
         .filter_map(|assoc_item| {
             let item = match assoc_item {
-                hir::AssocItem::Function(it) => sema.source(it)?.map(ast::AssocItem::Fn),
-                hir::AssocItem::TypeAlias(it) => sema.source(it)?.map(ast::AssocItem::TypeAlias),
-                hir::AssocItem::Const(it) => sema.source(it)?.map(ast::AssocItem::Const),
+                hir::AssocItem::Function(it) => {
+                    if ignore_hidden && it.attrs(sema.db).has_doc_hidden() {
+                        return None;
+                    }
+                    sema.source(it)?.map(ast::AssocItem::Fn)
+                }
+                hir::AssocItem::TypeAlias(it) => {
+                    if ignore_hidden && it.attrs(sema.db).has_doc_hidden() {
+                        return None;
+                    }
+
+                    sema.source(it)?.map(ast::AssocItem::TypeAlias)
+                }
+                hir::AssocItem::Const(it) => {
+                    if ignore_hidden && it.attrs(sema.db).has_doc_hidden() {
+                        return None;
+                    }
+
+                    sema.source(it)?.map(ast::AssocItem::Const)
+                }
             };
             Some(item)
         })