Support goto-declaration LSP command (#5646)

3 files changed, 27 insertions, 0 deletions

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 365d5b65..47ef1ff1 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -285,6 +285,7 @@ impl MappableCommand {
         select_mode, "Enter selection extend mode",
         exit_select_mode, "Exit selection mode",
         goto_definition, "Goto definition",
+        goto_declaration, "Goto declaration",
         add_newline_above, "Add newline above",
         add_newline_below, "Add newline below",
         goto_type_definition, "Goto type definition",
diff --git a/helix-term/src/commands/lsp.rs b/helix-term/src/commands/lsp.rs
index 578eb608..d12aa436 100644
--- a/helix-term/src/commands/lsp.rs
+++ b/helix-term/src/commands/lsp.rs
@@ -914,6 +914,31 @@ fn to_locations(definitions: Option<lsp::GotoDefinitionResponse>) -> Vec<lsp::Lo
     }
 }
 
+pub fn goto_declaration(cx: &mut Context) {
+    let (view, doc) = current!(cx.editor);
+    let language_server = language_server!(cx.editor, doc);
+    let offset_encoding = language_server.offset_encoding();
+
+    let pos = doc.position(view.id, offset_encoding);
+
+    let future = match language_server.goto_declaration(doc.identifier(), pos, None) {
+        Some(future) => future,
+        None => {
+            cx.editor
+                .set_error("Language server does not support goto-declaration");
+            return;
+        }
+    };
+
+    cx.callback(
+        future,
+        move |editor, compositor, response: Option<lsp::GotoDefinitionResponse>| {
+            let items = to_locations(response);
+            goto_impl(editor, compositor, items, offset_encoding);
+        },
+    );
+}
+
 pub fn goto_definition(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     let language_server = language_server!(cx.editor, doc);
diff --git a/helix-term/src/keymap/default.rs b/helix-term/src/keymap/default.rs
index ef93dee0..d48e6935 100644
--- a/helix-term/src/keymap/default.rs
+++ b/helix-term/src/keymap/default.rs
@@ -44,6 +44,7 @@ pub fn default() -> HashMap<Mode, Keymap> {
             "l" => goto_line_end,
             "s" => goto_first_nonwhitespace,
             "d" => goto_definition,
+            "D" => goto_declaration,
             "y" => goto_type_definition,
             "r" => goto_reference,
             "i" => goto_implementation,