Provide an option to not show derives near the ADT for "Goto Implementations" or "Implementations" codelens

I don't do it by default, for three reasons: (1) it's more expensive, (2) I actually quite like seeing the derives, and they may expand to no impl/more than one impl, (3) if #19130 will ever be merged this will become even more useful.

Even a config might be too much, but it was fun and easy to code so I did that.

crates/hir/src/semantics.rs

@@ -2105,6 +2105,22 @@ impl<'db> SemanticsImpl<'db> {
             parent = parent_;
         }
     }
+
+    pub fn impl_generated_from_derive(&self, impl_: Impl) -> Option<Adt> {
+        let source = hir_def::src::HasSource::ast_ptr(&impl_.id.loc(self.db), self.db);
+        let mut file_id = source.file_id;
+        let adt_ast_id = loop {
+            let macro_call = file_id.macro_file()?;
+            match macro_call.loc(self.db).kind {
+                hir_expand::MacroCallKind::Derive { ast_id, .. } => break ast_id,
+                hir_expand::MacroCallKind::FnLike { ast_id, .. } => file_id = ast_id.file_id,
+                hir_expand::MacroCallKind::Attr { ast_id, .. } => file_id = ast_id.file_id,
+            }
+        };
+        let adt_source = adt_ast_id.to_in_file_node(self.db);
+        self.cache(adt_source.value.syntax().ancestors().last().unwrap(), adt_source.file_id);
+        ToDef::to_def(self, adt_source.as_ref())
+    }
 }
 
 // FIXME This can't be the best way to do this

crates/ide/src/annotations.rs

@@ -9,7 +9,7 @@ use syntax::{AstNode, TextRange, ast::HasName};
 use crate::{
     NavigationTarget, RunnableKind,
     annotations::fn_references::find_all_methods,
-    goto_implementation::goto_implementation,
+    goto_implementation::{GotoImplementationConfig, goto_implementation},
     navigation_target,
     references::{FindAllRefsConfig, find_all_refs},
     runnables::{Runnable, runnables},
@@ -44,6 +44,7 @@ pub struct AnnotationConfig<'a> {
     pub annotate_method_references: bool,
     pub annotate_enum_variant_references: bool,
     pub location: AnnotationLocation,
+    pub filter_adjacent_derive_implementations: bool,
     pub minicore: MiniCore<'a>,
 }
 
@@ -204,7 +205,12 @@ pub(crate) fn resolve_annotation(
 ) -> Annotation {
     match annotation.kind {
         AnnotationKind::HasImpls { pos, ref mut data } => {
-            *data = goto_implementation(db, pos).map(|range| range.info);
+            let goto_implementation_config = GotoImplementationConfig {
+                filter_adjacent_derive_implementations: config
+                    .filter_adjacent_derive_implementations,
+            };
+            *data =
+                goto_implementation(db, &goto_implementation_config, pos).map(|range| range.info);
         }
         AnnotationKind::HasReferences { pos, ref mut data } => {
             *data = find_all_refs(
@@ -253,6 +259,7 @@ mod tests {
         annotate_enum_variant_references: true,
         location: AnnotationLocation::AboveName,
         minicore: MiniCore::default(),
+        filter_adjacent_derive_implementations: false,
     };
 
     fn check_with_config(

crates/ide/src/goto_implementation.rs

@@ -8,6 +8,10 @@ use syntax::{AstNode, SyntaxKind::*, T, ast};
 
 use crate::{FilePosition, NavigationTarget, RangeInfo, TryToNav};
 
+pub struct GotoImplementationConfig {
+    pub filter_adjacent_derive_implementations: bool,
+}
+
 // Feature: Go to Implementation
 //
 // Navigates to the impl items of types.
@@ -19,6 +23,7 @@ use crate::{FilePosition, NavigationTarget, RangeInfo, TryToNav};
 // ![Go to Implementation](https://user-images.githubusercontent.com/48062697/113065566-02f85480-91b1-11eb-9288-aaad8abd8841.gif)
 pub(crate) fn goto_implementation(
     db: &RootDatabase,
+    config: &GotoImplementationConfig,
     FilePosition { file_id, offset }: FilePosition,
 ) -> Option<RangeInfo<Vec<NavigationTarget>>> {
     let sema = Semantics::new(db);
@@ -55,7 +60,19 @@ pub(crate) fn goto_implementation(
                 .and_then(|def| {
                     let navs = match def {
                         Definition::Trait(trait_) => impls_for_trait(&sema, trait_),
-                        Definition::Adt(adt) => impls_for_ty(&sema, adt.ty(sema.db)),
+                        Definition::Adt(adt) => {
+                            let mut impls = Impl::all_for_type(db, adt.ty(sema.db));
+                            if config.filter_adjacent_derive_implementations {
+                                impls.retain(|impl_| {
+                                    sema.impl_generated_from_derive(*impl_) != Some(adt)
+                                });
+                            }
+                            impls
+                                .into_iter()
+                                .filter_map(|imp| imp.try_to_nav(&sema))
+                                .flatten()
+                                .collect()
+                        }
                         Definition::TypeAlias(alias) => impls_for_ty(&sema, alias.ty(sema.db)),
                         Definition::BuiltinType(builtin) => {
                             impls_for_ty(&sema, builtin.ty(sema.db))
@@ -125,12 +142,24 @@ mod tests {
     use ide_db::FileRange;
     use itertools::Itertools;
 
-    use crate::fixture;
+    use crate::{GotoImplementationConfig, fixture};
 
+    const TEST_CONFIG: &GotoImplementationConfig =
+        &GotoImplementationConfig { filter_adjacent_derive_implementations: false };
+
+    #[track_caller]
     fn check(#[rust_analyzer::rust_fixture] ra_fixture: &str) {
+        check_with_config(TEST_CONFIG, ra_fixture);
+    }
+
+    #[track_caller]
+    fn check_with_config(
+        config: &GotoImplementationConfig,
+        #[rust_analyzer::rust_fixture] ra_fixture: &str,
+    ) {
         let (analysis, position, expected) = fixture::annotations(ra_fixture);
 
-        let navs = analysis.goto_implementation(position).unwrap().unwrap().info;
+        let navs = analysis.goto_implementation(config, position).unwrap().unwrap().info;
 
         let cmp = |frange: &FileRange| (frange.file_id, frange.range.start());
 
@@ -416,4 +445,22 @@ fn test() {
 "#,
         );
     }
+
+    #[test]
+    fn filter_adjacent_derives() {
+        check_with_config(
+            &GotoImplementationConfig { filter_adjacent_derive_implementations: true },
+            r#"
+//- minicore: clone, copy, derive
+
+#[derive(Clone, Copy)]
+struct Foo$0;
+
+trait Bar {}
+
+impl Bar for Foo {}
+          // ^^^
+            "#,
+        );
+    }
 }

crates/ide/src/lib.rs

@@ -86,6 +86,7 @@ pub use crate::{
     file_structure::{FileStructureConfig, StructureNode, StructureNodeKind},
     folding_ranges::{Fold, FoldKind},
     goto_definition::GotoDefinitionConfig,
+    goto_implementation::GotoImplementationConfig,
     highlight_related::{HighlightRelatedConfig, HighlightedRange},
     hover::{
         HoverAction, HoverConfig, HoverDocFormat, HoverGotoTypeData, HoverResult,
@@ -537,9 +538,10 @@ impl Analysis {
     /// Returns the impls from the symbol at `position`.
     pub fn goto_implementation(
         &self,
+        config: &GotoImplementationConfig,
         position: FilePosition,
     ) -> Cancellable<Option<RangeInfo<Vec<NavigationTarget>>>> {
-        self.with_db(|db| goto_implementation::goto_implementation(db, position))
+        self.with_db(|db| goto_implementation::goto_implementation(db, config, position))
     }
 
     /// Returns the type definitions for the symbol at `position`.

crates/rust-analyzer/src/cli/analysis_stats.rs

@@ -1214,6 +1214,7 @@ impl flags::AnalysisStats {
             annotate_method_references: false,
             annotate_enum_variant_references: false,
             location: ide::AnnotationLocation::AboveName,
+            filter_adjacent_derive_implementations: false,
             minicore: MiniCore::default(),
         };
         for &file_id in file_ids {

crates/rust-analyzer/src/config.rs

@@ -10,9 +10,9 @@ use hir::Symbol;
 use ide::{
     AnnotationConfig, AssistConfig, CallHierarchyConfig, CallableSnippets, CompletionConfig,
     CompletionFieldsToResolve, DiagnosticsConfig, GenericParameterHints, GotoDefinitionConfig,
-    HighlightConfig, HighlightRelatedConfig, HoverConfig, HoverDocFormat, InlayFieldsToResolve,
-    InlayHintsConfig, JoinLinesConfig, MemoryLayoutHoverConfig, MemoryLayoutHoverRenderKind,
-    RenameConfig, Snippet, SnippetScope, SourceRootId,
+    GotoImplementationConfig, HighlightConfig, HighlightRelatedConfig, HoverConfig, HoverDocFormat,
+    InlayFieldsToResolve, InlayHintsConfig, JoinLinesConfig, MemoryLayoutHoverConfig,
+    MemoryLayoutHoverRenderKind, RenameConfig, Snippet, SnippetScope, SourceRootId,
 };
 use ide_db::{
     MiniCore, SnippetCap,
@@ -98,6 +98,9 @@ config_data! {
         /// Code's `files.watcherExclude`.
         files_exclude | files_excludeDirs: Vec<Utf8PathBuf> = vec![],
 
+        /// If this is `true`, when "Goto Implementations" and in "Implementations" lens, are triggered on a `struct` or `enum` or `union`, we filter out trait implementations that originate from `derive`s above the type.
+        gotoImplementations_filterAdjacentDerives: bool = false,
+
         /// Highlight related return values while the cursor is on any `match`, `if`, or match arm
         /// arrow (`=>`).
         highlightRelated_branchExitPoints_enable: bool = true,
@@ -1413,6 +1416,7 @@ pub struct LensConfig {
 
     // annotations
     pub location: AnnotationLocation,
+    pub filter_adjacent_derive_implementations: bool,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
@@ -1469,6 +1473,7 @@ impl LensConfig {
             annotate_enum_variant_references: self.enum_variant_refs,
             location: self.location.into(),
             minicore,
+            filter_adjacent_derive_implementations: self.filter_adjacent_derive_implementations,
         }
     }
 }
@@ -2503,6 +2508,15 @@ impl Config {
             refs_trait: *self.lens_enable() && *self.lens_references_trait_enable(),
             enum_variant_refs: *self.lens_enable() && *self.lens_references_enumVariant_enable(),
             location: *self.lens_location(),
+            filter_adjacent_derive_implementations: *self
+                .gotoImplementations_filterAdjacentDerives(),
+        }
+    }
+
+    pub fn goto_implementation(&self) -> GotoImplementationConfig {
+        GotoImplementationConfig {
+            filter_adjacent_derive_implementations: *self
+                .gotoImplementations_filterAdjacentDerives(),
         }
     }
 

crates/rust-analyzer/src/handlers/request.rs

@@ -849,10 +849,11 @@ pub(crate) fn handle_goto_implementation(
     let _p = tracing::info_span!("handle_goto_implementation").entered();
     let position =
         try_default!(from_proto::file_position(&snap, params.text_document_position_params)?);
-    let nav_info = match snap.analysis.goto_implementation(position)? {
-        None => return Ok(None),
-        Some(it) => it,
-    };
+    let nav_info =
+        match snap.analysis.goto_implementation(&snap.config.goto_implementation(), position)? {
+            None => return Ok(None),
+            Some(it) => it,
+        };
     let src = FileRange { file_id: position.file_id, range: nav_info.range };
     let res = to_proto::goto_definition_response(&snap, Some(src), nav_info.info)?;
     Ok(Some(res))
@@ -2142,7 +2143,10 @@ fn show_impl_command_link(
 ) -> Option<lsp_ext::CommandLinkGroup> {
     if implementations
         && show_references
-        && let Some(nav_data) = snap.analysis.goto_implementation(*position).unwrap_or(None)
+        && let Some(nav_data) = snap
+            .analysis
+            .goto_implementation(&snap.config.goto_implementation(), *position)
+            .unwrap_or(None)
     {
         let uri = to_proto::url(snap, position.file_id);
         let line_index = snap.file_line_index(position.file_id).ok()?;

docs/book/src/configuration_generated.md

@@ -635,6 +635,13 @@ Default: `"client"`
 Controls file watching implementation.
 
 
+## rust-analyzer.gotoImplementations.filterAdjacentDerives {#gotoImplementations.filterAdjacentDerives}
+
+Default: `false`
+
+If this is `true`, when "Goto Implementations" and in "Implementations" lens, are triggered on a `struct` or `enum` or `union`, we filter out trait implementations that originate from `derive`s above the type.
+
+
 ## rust-analyzer.highlightRelated.branchExitPoints.enable {#highlightRelated.branchExitPoints.enable}
 
 Default: `true`

editors/code/package.json

@@ -1627,6 +1627,16 @@
                     }
                 }
             },
+            {
+                "title": "Goto Implementations",
+                "properties": {
+                    "rust-analyzer.gotoImplementations.filterAdjacentDerives": {
+                        "markdownDescription": "If this is `true`, when \"Goto Implementations\" and in \"Implementations\" lens, are triggered on a `struct` or `enum` or `union`, we filter out trait implementations that originate from `derive`s above the type.",
+                        "default": false,
+                        "type": "boolean"
+                    }
+                }
+            },
             {
                 "title": "Highlight Related",
                 "properties": {