1 files changed, 97 insertions, 0 deletions

diff --git a/crates/ra_ide/src/display/short_label.rs b/crates/ra_ide/src/display/short_label.rs
new file mode 100644
index 000000000..9ffc9b980
--- /dev/null
+++ b/crates/ra_ide/src/display/short_label.rs
@@ -0,0 +1,97 @@
+//! FIXME: write short doc here
+
+use format_buf::format;
+use ra_syntax::ast::{self, AstNode, NameOwner, TypeAscriptionOwner, VisibilityOwner};
+
+pub(crate) trait ShortLabel {
+    fn short_label(&self) -> Option<String>;
+}
+
+impl ShortLabel for ast::FnDef {
+    fn short_label(&self) -> Option<String> {
+        Some(crate::display::function_label(self))
+    }
+}
+
+impl ShortLabel for ast::StructDef {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_node(self, "struct ")
+    }
+}
+
+impl ShortLabel for ast::UnionDef {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_node(self, "union ")
+    }
+}
+
+impl ShortLabel for ast::EnumDef {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_node(self, "enum ")
+    }
+}
+
+impl ShortLabel for ast::TraitDef {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_node(self, "trait ")
+    }
+}
+
+impl ShortLabel for ast::Module {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_node(self, "mod ")
+    }
+}
+
+impl ShortLabel for ast::TypeAliasDef {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_node(self, "type ")
+    }
+}
+
+impl ShortLabel for ast::ConstDef {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_ascribed_node(self, "const ")
+    }
+}
+
+impl ShortLabel for ast::StaticDef {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_ascribed_node(self, "static ")
+    }
+}
+
+impl ShortLabel for ast::RecordFieldDef {
+    fn short_label(&self) -> Option<String> {
+        short_label_from_ascribed_node(self, "")
+    }
+}
+
+impl ShortLabel for ast::EnumVariant {
+    fn short_label(&self) -> Option<String> {
+        Some(self.name()?.text().to_string())
+    }
+}
+
+fn short_label_from_ascribed_node<T>(node: &T, prefix: &str) -> Option<String>
+where
+    T: NameOwner + VisibilityOwner + TypeAscriptionOwner,
+{
+    let mut buf = short_label_from_node(node, prefix)?;
+
+    if let Some(type_ref) = node.ascribed_type() {
+        format!(buf, ": {}", type_ref.syntax());
+    }
+
+    Some(buf)
+}
+
+fn short_label_from_node<T>(node: &T, label: &str) -> Option<String>
+where
+    T: NameOwner + VisibilityOwner,
+{
+    let mut buf = node.visibility().map(|v| format!("{} ", v.syntax())).unwrap_or_default();
+    buf.push_str(label);
+    buf.push_str(node.name()?.text().as_str());
+    Some(buf)
+}