1 files changed, 57 insertions, 0 deletions
diff --git a/src/tools/rust-analyzer/crates/ide-completion/src/render/type_alias.rs b/src/tools/rust-analyzer/crates/ide-completion/src/render/type_alias.rs
new file mode 100644
index 000000000..f1b23c76e
--- /dev/null
+++ b/src/tools/rust-analyzer/crates/ide-completion/src/render/type_alias.rs
@@ -0,0 +1,57 @@
+//! Renderer for type aliases.
+
+use hir::{AsAssocItem, HirDisplay};
+use ide_db::SymbolKind;
+use syntax::SmolStr;
+
+use crate::{item::CompletionItem, render::RenderContext};
+
+pub(crate) fn render_type_alias(
+    ctx: RenderContext<'_>,
+    type_alias: hir::TypeAlias,
+) -> Option<CompletionItem> {
+    let _p = profile::span("render_type_alias");
+    render(ctx, type_alias, false)
+}
+
+pub(crate) fn render_type_alias_with_eq(
+    ctx: RenderContext<'_>,
+    type_alias: hir::TypeAlias,
+) -> Option<CompletionItem> {
+    let _p = profile::span("render_type_alias_with_eq");
+    render(ctx, type_alias, true)
+}
+
+fn render(
+    ctx: RenderContext<'_>,
+    type_alias: hir::TypeAlias,
+    with_eq: bool,
+) -> Option<CompletionItem> {
+    let db = ctx.db();
+
+    let name = type_alias.name(db);
+    let (name, escaped_name) = if with_eq {
+        (
+            SmolStr::from_iter([&name.to_smol_str(), " = "]),
+            SmolStr::from_iter([&name.escaped().to_smol_str(), " = "]),
+        )
+    } else {
+        (name.to_smol_str(), name.escaped().to_smol_str())
+    };
+    let detail = type_alias.display(db).to_string();
+
+    let mut item = CompletionItem::new(SymbolKind::TypeAlias, ctx.source_range(), name.clone());
+    item.set_documentation(ctx.docs(type_alias))
+        .set_deprecated(ctx.is_deprecated(type_alias) || ctx.is_deprecated_assoc_item(type_alias))
+        .detail(detail)
+        .set_relevance(ctx.completion_relevance());
+
+    if let Some(actm) = type_alias.as_assoc_item(db) {
+        if let Some(trt) = actm.containing_trait_or_trait_impl(db) {
+            item.trait_name(trt.name(db).to_smol_str());
+        }
+    }
+    item.insert_text(escaped_name);
+
+    Some(item.build())
+}