Guess macro braces from docs

1 files changed, 60 insertions, 2 deletions

diff --git a/crates/ra_ide_api/src/completion/complete_macro_in_item_position.rs b/crates/ra_ide_api/src/completion/complete_macro_in_item_position.rs
index d808b2357..09f743c66 100644
--- a/crates/ra_ide_api/src/completion/complete_macro_in_item_position.rs
+++ b/crates/ra_ide_api/src/completion/complete_macro_in_item_position.rs
@@ -56,6 +56,16 @@ mod tests {
             do_reference_completion(
                 "
                 //- /main.rs
+                /// Creates a [`Vec`] containing the arguments.
+                ///
+                /// - Create a [`Vec`] containing a given list of elements:
+                ///
+                /// ```
+                /// let v = vec![1, 2, 3];
+                /// assert_eq!(v[0], 1);
+                /// assert_eq!(v[1], 2);
+                /// assert_eq!(v[2], 3);
+                /// ```
                 macro_rules! vec {
                     () => {}
                 }
@@ -68,13 +78,61 @@ mod tests {
             @r##"[
     CompletionItem {
         label: "vec!",
-        source_range: [46; 46),
-        delete: [46; 46),
+        source_range: [280; 280),
+        delete: [280; 280),
         insert: "vec![$0]",
         kind: Macro,
         detail: "macro_rules! vec",
+        documentation: Documentation(
+            "Creates a [`Vec`] containing the arguments.\n\n- Create a [`Vec`] containing a given list of elements:\n\n```\nlet v = vec![1, 2, 3];\nassert_eq!(v[0], 1);\nassert_eq!(v[1], 2);\nassert_eq!(v[2], 3);\n```",
+        ),
     },
 ]"##
         );
     }
+
+    #[test]
+    fn completes_macros_braces_guessing() {
+        assert_debug_snapshot!(
+            do_reference_completion(
+                "
+                //- /main.rs
+                /// Foo
+                ///
+                /// Not call `fooo!()` `fooo!()`, or `_foo![]` `_foo![]`.
+                /// Call as `let _=foo!  { hello world };`
+                macro_rules! foo {
+                    () => {}
+                }
+
+                fn main() {
+                    <|>
+                }
+                "
+            ),
+            @r###"[
+    CompletionItem {
+        label: "foo!",
+        source_range: [163; 163),
+        delete: [163; 163),
+        insert: "foo! {$0}",
+        kind: Macro,
+        detail: "macro_rules! foo",
+        documentation: Documentation(
+            "Foo\n\nNot call `fooo!()` `fooo!()`, or `_foo![]` `_foo![]`.\nCall as `let _=foo!  { hello world };`",
+        ),
+    },
+    CompletionItem {
+        label: "main()",
+        source_range: [163; 163),
+        delete: [163; 163),
+        insert: "main()$0",
+        kind: Function,
+        lookup: "main",
+        detail: "fn main()",
+    },
+]
+        "###
+        );
+    }
 }