Add a better text for hover and stop duplicating work done in approximatelly_resolve_symbol

crates/ra_analysis/src/imp.rs

@@ -323,6 +323,17 @@ impl AnalysisImpl {
 
         Ok(symbol.docs(&file))
     }
+    pub fn doc_text_for(&self, file_id: FileId, symbol: FileSymbol) -> Cancelable<Option<String>> {
+        let file = self.db.source_file(file_id);
+        let result = match (symbol.description(&file), symbol.docs(&file)) {
+            (Some(desc), Some(docs)) => Some("```rust\n".to_string() + &*desc + "\n```\n\n" + &*docs),
+            (Some(desc), None) => Some("```rust\n".to_string() + &*desc + "\n```"),
+            (None, Some(docs)) => Some(docs),
+            _ => None,
+        };
+
+        Ok(result)
+    }
 
     pub fn diagnostics(&self, file_id: FileId) -> Cancelable<Vec<Diagnostic>> {
         let syntax = self.db.source_file(file_id);

crates/ra_analysis/src/lib.rs

@@ -236,7 +236,7 @@ impl Analysis {
     pub fn approximately_resolve_symbol(
         &self,
         position: FilePosition,
-    ) -> Cancelable<Vec<(FileId, FileSymbol)>> {
+    ) -> Cancelable<Option<(TextRange, Vec<(FileId, FileSymbol)>)>> {
         self.imp.approximately_resolve_symbol(position)
     }
     pub fn find_all_refs(&self, position: FilePosition) -> Cancelable<Vec<(FileId, TextRange)>> {
@@ -249,6 +249,9 @@ impl Analysis {
     ) -> Cancelable<Option<String>> {
         self.imp.doc_comment_for(file_id, symbol)
     }
+    pub fn doc_text_for(&self, file_id: FileId, symbol: FileSymbol) -> Cancelable<Option<String>> {
+        self.imp.doc_text_for(file_id, symbol)
+    }
     pub fn parent_module(&self, position: FilePosition) -> Cancelable<Vec<(FileId, FileSymbol)>> {
         self.imp.parent_module(position)
     }

crates/ra_analysis/tests/tests.rs

@@ -21,9 +21,9 @@ fn approximate_resolve_works_in_items() {
     ",
     );
 
-    let symbols = analysis.approximately_resolve_symbol(pos).unwrap();
+    let symbols = analysis.approximately_resolve_symbol(pos).unwrap().unwrap();
     assert_eq_dbg(
-        r#"[(FileId(1), FileSymbol { name: "Foo", node_range: [0; 11), kind: STRUCT_DEF })]"#,
+        r#"([23; 26), [(FileId(1), FileSymbol { name: "Foo", node_range: [0; 11), kind: STRUCT_DEF })])"#,
         &symbols,
     );
 }
@@ -39,9 +39,9 @@ fn test_resolve_module() {
     ",
     );
 
-    let symbols = analysis.approximately_resolve_symbol(pos).unwrap();
+    let symbols = analysis.approximately_resolve_symbol(pos).unwrap().unwrap();
     assert_eq_dbg(
-        r#"[(FileId(2), FileSymbol { name: "foo", node_range: [0; 0), kind: MODULE })]"#,
+        r#"([4; 7), [(FileId(2), FileSymbol { name: "foo", node_range: [0; 0), kind: MODULE })])"#,
         &symbols,
     );
 
@@ -54,9 +54,9 @@ fn test_resolve_module() {
     ",
     );
 
-    let symbols = analysis.approximately_resolve_symbol(pos).unwrap();
+    let symbols = analysis.approximately_resolve_symbol(pos).unwrap().unwrap();
     assert_eq_dbg(
-        r#"[(FileId(2), FileSymbol { name: "foo", node_range: [0; 0), kind: MODULE })]"#,
+        r#"([4; 7), [(FileId(2), FileSymbol { name: "foo", node_range: [0; 0), kind: MODULE })])"#,
         &symbols,
     );
 }

crates/ra_editor/src/symbols.rs

@@ -50,6 +50,61 @@ impl FileSymbol {
             })
             .nth(0)
     }
+    /// Get a description of this node.
+    ///
+    /// e.g. `struct Name`, `enum Name`, `fn Name`
+    pub fn description(&self, file: &SourceFileNode) -> Option<String> {
+        // TODO: After type inference is done, add type information to improve the output
+        file.syntax()
+            .descendants()
+            .filter(|node| node.kind() == self.kind && node.range() == self.node_range)
+            .filter_map(|node: SyntaxNodeRef| {
+                // TODO: Refactor to be have less repetition
+                visitor()
+                    .visit(|node: ast::FnDef| {
+                        let mut string = "fn ".to_string();
+                        node.name()?.syntax().text().push_to(&mut string);
+                        Some(string)
+                    })
+                    .visit(|node: ast::StructDef| {
+                        let mut string = "struct ".to_string();
+                        node.name()?.syntax().text().push_to(&mut string);
+                        Some(string)
+                    })
+                    .visit(|node: ast::EnumDef| {
+                        let mut string = "enum ".to_string();
+                        node.name()?.syntax().text().push_to(&mut string);
+                        Some(string)
+                    })
+                    .visit(|node: ast::TraitDef| {
+                        let mut string = "trait ".to_string();
+                        node.name()?.syntax().text().push_to(&mut string);
+                        Some(string)
+                    })
+                    .visit(|node: ast::Module| {
+                        let mut string = "mod ".to_string();
+                        node.name()?.syntax().text().push_to(&mut string);
+                        Some(string)
+                    })
+                    .visit(|node: ast::TypeDef| {
+                        let mut string = "type ".to_string();
+                        node.name()?.syntax().text().push_to(&mut string);
+                        Some(string)
+                    })
+                    .visit(|node: ast::ConstDef| {
+                        let mut string = "const ".to_string();
+                        node.name()?.syntax().text().push_to(&mut string);
+                        Some(string)
+                    })
+                    .visit(|node: ast::StaticDef| {
+                        let mut string = "static ".to_string();
+                        node.name()?.syntax().text().push_to(&mut string);
+                        Some(string)
+                    })
+                    .accept(node)?
+            })
+            .nth(0)
+    }
 }
 
 pub fn file_symbols(file: &SourceFileNode) -> Vec<FileSymbol> {

crates/ra_lsp_server/src/main_loop/handlers.rs

@@ -204,7 +204,10 @@ pub fn handle_goto_definition(
 ) -> Result<Option<req::GotoDefinitionResponse>> {
     let position = params.try_conv_with(&world)?;
     let mut res = Vec::new();
-    for (file_id, symbol) in world.analysis().approximately_resolve_symbol(position)? {
+    for (file_id, symbol) in match world.analysis().approximately_resolve_symbol(position)? {
+        None => return Ok(None),
+        Some(it) => it.1,
+    } {
         let line_index = world.analysis().file_line_index(file_id);
         let location = to_location(file_id, symbol.node_range, &world, &line_index)?;
         res.push(location)
@@ -504,33 +507,31 @@ pub fn handle_hover(
     world: ServerWorld,
     params: req::TextDocumentPositionParams,
 ) -> Result<Option<Hover>> {
+    // TODO: Cut down on number of allocations
     let position = params.try_conv_with(&world)?;
     let line_index = world.analysis().file_line_index(position.file_id);
-    let file = world.analysis().file_syntax(position.file_id);
+    let (range, resolved) = match world.analysis().approximately_resolve_symbol(position)? {
-
+        None => return Ok(None),
-    for (file_id, symbol) in world.analysis().approximately_resolve_symbol(position)? {
+        Some(it) => it,
-        let comment = world.analysis.doc_comment_for(file_id, symbol)?;
+    };
-
+    let mut result = Vec::new();
-        if comment.is_some() {
+    for (file_id, symbol) in resolved {
-            let range = match ra_syntax::algo::find_leaf_at_offset(file.syntax(), position.offset)
+        if let Some(docs) = world.analysis().doc_text_for(file_id, symbol)? {
-                .left_biased()
+            result.push(docs);
-            {
-                None => return Ok(None),
-                Some(it) => it.range(),
-            };
-            let range = range.conv_with(&line_index);
-            let contents = HoverContents::Scalar(MarkedString::String(comment.unwrap()));
-
-            return Ok(Some(Hover {
-                contents,
-                range: Some(range),
-            }));
         }
     }
-
+    let range = range.conv_with(&line_index);
+    if result.len() > 0 {
+        return Ok(Some(Hover {
+            contents: HoverContents::Scalar(MarkedString::String(result.join("\n\n---\n"))),
+            range: Some(range),
+        }));
+    }
     Ok(None)
 }
 
+
+/// Test doc comment
 pub fn handle_prepare_rename(
     world: ServerWorld,
     params: req::TextDocumentPositionParams,

crates/ra_syntax/src/syntax_kinds/generated.rs

@@ -560,4 +560,3 @@ impl SyntaxKind {
         Some(tok)
     }
 }
-

crates/ra_syntax/src/syntax_kinds/generated.rs.tera

@@ -75,4 +75,3 @@ impl SyntaxKind {
         Some(tok)
     }
 }
-