4 files changed, 108 insertions, 6 deletions

diff --git a/crates/ra_ide_api/Cargo.toml b/crates/ra_ide_api/Cargo.toml
index 61942bbbb..dfdddea50 100644
--- a/crates/ra_ide_api/Cargo.toml
+++ b/crates/ra_ide_api/Cargo.toml
@@ -6,6 +6,7 @@ authors = ["Aleksey Kladov <[email protected]>"]
 
 [dependencies]
 itertools = "0.8.0"
+join_to_string = "0.1.3"
 log = "0.4.5"
 relative-path = "0.4.0"
 rayon = "1.0.2"
diff --git a/crates/ra_ide_api/src/completion/complete_path.rs b/crates/ra_ide_api/src/completion/complete_path.rs
index e3f1d42f8..172aedf95 100644
--- a/crates/ra_ide_api/src/completion/complete_path.rs
+++ b/crates/ra_ide_api/src/completion/complete_path.rs
@@ -1,3 +1,5 @@
+use join_to_string::join;
+
 use crate::{
     completion::{CompletionItem, CompletionItemKind, Completions, CompletionKind, CompletionContext},
 };
@@ -29,6 +31,15 @@ pub(super) fn complete_path(acc: &mut Completions, ctx: &CompletionContext) {
         hir::ModuleDef::Enum(e) => {
             e.variants(ctx.db).into_iter().for_each(|variant| {
                 if let Some(name) = variant.name(ctx.db) {
+                    let detail_types = variant
+                        .fields(ctx.db)
+                        .into_iter()
+                        .map(|field| field.ty(ctx.db));
+                    let detail = join(detail_types)
+                        .separator(", ")
+                        .surround_with("(", ")")
+                        .to_string();
+
                     CompletionItem::new(
                         CompletionKind::Reference,
                         ctx.source_range(),
@@ -36,6 +47,7 @@ pub(super) fn complete_path(acc: &mut Completions, ctx: &CompletionContext) {
                     )
                     .kind(CompletionItemKind::EnumVariant)
                     .set_documentation(variant.docs(ctx.db))
+                    .set_detail(Some(detail))
                     .add_to(acc)
                 }
             });
@@ -116,7 +128,7 @@ mod tests {
     #[test]
     fn completes_enum_variant() {
         check_reference_completion(
-            "reference_completion",
+            "enum_variant",
             "
             //- /lib.rs
             /// An enum
@@ -130,4 +142,25 @@ mod tests {
             ",
         );
     }
+
+    #[test]
+    fn completes_enum_variant_with_details() {
+        check_reference_completion(
+            "enum_variant_with_details",
+            "
+            //- /lib.rs
+            struct S { field: u32 }
+            /// An enum
+            enum E {
+                /// Foo Variant (empty)
+                Foo,
+                /// Bar Variant with i32 and u32
+                Bar(i32, u32),
+                ///
+                S(S),
+            }
+            fn foo() { let _ = E::<|> }
+            ",
+        );
+    }
 }
diff --git a/crates/ra_ide_api/src/completion/snapshots/completion_item__reference_completion.snap b/crates/ra_ide_api/src/completion/snapshots/completion_item__enum_variant.snap
index e46f7807b..8c84439b2 100644
--- a/crates/ra_ide_api/src/completion/snapshots/completion_item__reference_completion.snap
+++ b/crates/ra_ide_api/src/completion/snapshots/completion_item__enum_variant.snap
@@ -1,8 +1,8 @@
 ---
-created: "2019-01-23T23:49:43.278245900+00:00"
-creator: [email protected].1
+created: "2019-01-25T16:44:04.640545300+00:00"
+creator: [email protected].2
 expression: kind_completions
-source: "crates\\ra_ide_api\\src\\completion\\completion_item.rs"
+source: crates/ra_ide_api/src/completion/completion_item.rs
 ---
 [
     CompletionItem {
@@ -11,7 +11,9 @@ source: "crates\\ra_ide_api\\src\\completion\\completion_item.rs"
         kind: Some(
             EnumVariant
         ),
-        detail: None,
+        detail: Some(
+            "()"
+        ),
         documentation: Some(
             Documentation(
                 "Foo Variant"
@@ -29,7 +31,9 @@ source: "crates\\ra_ide_api\\src\\completion\\completion_item.rs"
         kind: Some(
             EnumVariant
         ),
-        detail: None,
+        detail: Some(
+            "(i32)"
+        ),
         documentation: Some(
             Documentation(
                 "Bar Variant with i32"
diff --git a/crates/ra_ide_api/src/completion/snapshots/completion_item__enum_variant_with_details.snap b/crates/ra_ide_api/src/completion/snapshots/completion_item__enum_variant_with_details.snap
new file mode 100644
index 000000000..384634517
--- /dev/null
+++ b/crates/ra_ide_api/src/completion/snapshots/completion_item__enum_variant_with_details.snap
@@ -0,0 +1,64 @@
+---
+created: "2019-01-25T16:44:04.641542400+00:00"
+creator: [email protected]
+expression: kind_completions
+source: crates/ra_ide_api/src/completion/completion_item.rs
+---
+[
+    CompletionItem {
+        completion_kind: Reference,
+        label: "Foo",
+        kind: Some(
+            EnumVariant
+        ),
+        detail: Some(
+            "()"
+        ),
+        documentation: Some(
+            Documentation(
+                "Foo Variant (empty)"
+            )
+        ),
+        lookup: None,
+        insert_text: None,
+        insert_text_format: PlainText,
+        source_range: [180; 180),
+        text_edit: None
+    },
+    CompletionItem {
+        completion_kind: Reference,
+        label: "Bar",
+        kind: Some(
+            EnumVariant
+        ),
+        detail: Some(
+            "(i32, u32)"
+        ),
+        documentation: Some(
+            Documentation(
+                "Bar Variant with i32 and u32"
+            )
+        ),
+        lookup: None,
+        insert_text: None,
+        insert_text_format: PlainText,
+        source_range: [180; 180),
+        text_edit: None
+    },
+    CompletionItem {
+        completion_kind: Reference,
+        label: "S",
+        kind: Some(
+            EnumVariant
+        ),
+        detail: Some(
+            "(S)"
+        ),
+        documentation: None,
+        lookup: None,
+        insert_text: None,
+        insert_text_format: PlainText,
+        source_range: [180; 180),
+        text_edit: None
+    }
+]