Add TypeAliasRender

crates/completion/src/render/const_.rs

@@ -37,8 +37,7 @@ impl<'a> ConstRender<'a> {
     }
 
     fn name(&self) -> Option<String> {
-        let ast_node = self.const_.source(self.ctx.db()).value;
-        ast_node.name().map(|name| name.text().to_string())
+        self.ast_node.name().map(|name| name.text().to_string())
     }
 
     fn detail(&self) -> String {

crates/completion/src/render/type_alias.rs

@@ -0,0 +1,46 @@
+use hir::HasSource;
+use syntax::{
+    ast::{NameOwner, TypeAlias},
+    display::type_label,
+};
+
+use crate::{
+    item::{CompletionItem, CompletionItemKind, CompletionKind},
+    render::RenderContext,
+};
+
+#[derive(Debug)]
+pub(crate) struct TypeAliasRender<'a> {
+    ctx: RenderContext<'a>,
+    type_alias: hir::TypeAlias,
+    ast_node: TypeAlias,
+}
+
+impl<'a> TypeAliasRender<'a> {
+    pub(crate) fn new(ctx: RenderContext<'a>, type_alias: hir::TypeAlias) -> TypeAliasRender<'a> {
+        let ast_node = type_alias.source(ctx.db()).value;
+        TypeAliasRender { ctx, type_alias, ast_node }
+    }
+
+    pub(crate) fn render(self) -> Option<CompletionItem> {
+        let name = self.name()?;
+        let detail = self.detail();
+
+        let item = CompletionItem::new(CompletionKind::Reference, self.ctx.source_range(), name)
+            .kind(CompletionItemKind::TypeAlias)
+            .set_documentation(self.ctx.docs(self.type_alias))
+            .set_deprecated(self.ctx.is_deprecated(self.type_alias))
+            .detail(detail)
+            .build();
+
+        Some(item)
+    }
+
+    fn name(&self) -> Option<String> {
+        self.ast_node.name().map(|name| name.text().to_string())
+    }
+
+    fn detail(&self) -> String {
+        type_label(&self.ast_node)
+    }
+}