4 files changed, 25 insertions, 8 deletions

diff --git a/crates/ra_ide_api/src/expand_macro.rs b/crates/ra_ide_api/src/expand_macro.rs
index bd557d455..44e77ba50 100644
--- a/crates/ra_ide_api/src/expand_macro.rs
+++ b/crates/ra_ide_api/src/expand_macro.rs
@@ -11,7 +11,12 @@ use ra_syntax::{
     AstNode, NodeOrToken, SyntaxKind, SyntaxNode, WalkEvent,
 };
 
-pub(crate) fn expand_macro(db: &RootDatabase, position: FilePosition) -> Option<(String, String)> {
+pub struct ExpandedMacro {
+    pub name: String,
+    pub expansion: String,
+}
+
+pub(crate) fn expand_macro(db: &RootDatabase, position: FilePosition) -> Option<ExpandedMacro> {
     let parse = db.parse(position.file_id);
     let file = parse.tree();
     let name_ref = find_node_at_offset::<ast::NameRef>(file.syntax(), position.offset)?;
@@ -23,8 +28,8 @@ pub(crate) fn expand_macro(db: &RootDatabase, position: FilePosition) -> Option<
     // FIXME:
     // macro expansion may lose all white space information
     // But we hope someday we can use ra_fmt for that
-    let res = insert_whitespaces(expanded);
-    Some((name_ref.text().to_string(), res))
+    let expansion = insert_whitespaces(expanded);
+    Some(ExpandedMacro { name: name_ref.text().to_string(), expansion })
 }
 
 fn expand_macro_recur(
@@ -87,7 +92,8 @@ mod tests {
         let (analysis, pos) = analysis_and_position(fixture);
 
         let result = analysis.expand_macro(pos).unwrap().unwrap();
-        assert_eq!(result, (expected.0.to_string(), expected.1.to_string()));
+        assert_eq!(result.name, expected.0.to_string());
+        assert_eq!(result.expansion, expected.1.to_string());
     }
 
     #[test]
diff --git a/crates/ra_ide_api/src/lib.rs b/crates/ra_ide_api/src/lib.rs
index d1b73ef6f..57ed97147 100644
--- a/crates/ra_ide_api/src/lib.rs
+++ b/crates/ra_ide_api/src/lib.rs
@@ -66,6 +66,7 @@ pub use crate::{
     completion::{CompletionItem, CompletionItemKind, InsertTextFormat},
     diagnostics::Severity,
     display::{file_structure, FunctionSignature, NavigationTarget, StructureNode},
+    expand_macro::ExpandedMacro,
     feature_flags::FeatureFlags,
     folding_ranges::{Fold, FoldKind},
     hover::HoverResult,
@@ -297,7 +298,7 @@ impl Analysis {
         self.with_db(|db| syntax_tree::syntax_tree(&db, file_id, text_range))
     }
 
-    pub fn expand_macro(&self, position: FilePosition) -> Cancelable<Option<(String, String)>> {
+    pub fn expand_macro(&self, position: FilePosition) -> Cancelable<Option<ExpandedMacro>> {
         self.with_db(|db| expand_macro::expand_macro(db, position))
     }
 
diff --git a/crates/ra_lsp_server/src/main_loop/handlers.rs b/crates/ra_lsp_server/src/main_loop/handlers.rs
index 783b0a827..0461bf385 100644
--- a/crates/ra_lsp_server/src/main_loop/handlers.rs
+++ b/crates/ra_lsp_server/src/main_loop/handlers.rs
@@ -50,7 +50,7 @@ pub fn handle_syntax_tree(world: WorldSnapshot, params: req::SyntaxTreeParams) -
 pub fn handle_expand_macro(
     world: WorldSnapshot,
     params: req::ExpandMacroParams,
-) -> Result<Option<(String, String)>> {
+) -> Result<Option<req::ExpandedMacro>> {
     let _p = profile("handle_expand_macro");
     let file_id = params.text_document.try_conv_with(&world)?;
     let line_index = world.analysis().file_line_index(file_id)?;
@@ -58,7 +58,10 @@ pub fn handle_expand_macro(
 
     match offset {
         None => Ok(None),
-        Some(offset) => Ok(world.analysis().expand_macro(FilePosition { file_id, offset })?),
+        Some(offset) => {
+            let res = world.analysis().expand_macro(FilePosition { file_id, offset })?;
+            Ok(res.map(|it| req::ExpandedMacro { name: it.name, expansion: it.expansion }))
+        }
     }
 }
 
diff --git a/crates/ra_lsp_server/src/req.rs b/crates/ra_lsp_server/src/req.rs
index dbc0e9624..39361b7e8 100644
--- a/crates/ra_lsp_server/src/req.rs
+++ b/crates/ra_lsp_server/src/req.rs
@@ -45,11 +45,18 @@ pub struct SyntaxTreeParams {
     pub range: Option<Range>,
 }
 
+#[derive(Serialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct ExpandedMacro {
+    pub name: String,
+    pub expansion: String,
+}
+
 pub enum ExpandMacro {}
 
 impl Request for ExpandMacro {
     type Params = ExpandMacroParams;
-    type Result = Option<(String, String)>;
+    type Result = Option<ExpandedMacro>;
     const METHOD: &'static str = "rust-analyzer/expandMacro";
 }