Only show "Jump to command definition" for right-click on command name (#36191)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
GitOrigin-RevId: 05811783a327fb641f6c677eaa1efeb8a87668fc

services/web/frontend/js/features/source-editor/utils/command-definitions/command-name-at-pos.ts

@@ -0,0 +1,28 @@
+import { EditorState } from '@codemirror/state'
+import { SyntaxNode } from '@lezer/common'
+import { syntaxTree } from '@codemirror/language'
+
+/**
+ * Resolve the control sequence (e.g. `\mycmd`) at a document position, or null
+ * if the position is not on a command. Walks up from the innermost node to the
+ * nearest control-sequence node, mirroring the command-usage
+ * logic in tree-operations/commands.ts. Control symbols (e.g. `\\`, `\%`) are
+ * excluded: they are also in the `$CtrlSeq` group, but are never user-defined
+ * commands.
+ */
+export function commandNameAtPos(
+  state: EditorState,
+  pos: number
+): string | null {
+  const tree = syntaxTree(state)
+  // Bias right (as resolveCommandNode does) so a click on the command's first
+  // character resolves into it rather than the preceding token.
+  let node: SyntaxNode | null = tree.resolveInner(pos, 1)
+  for (; node; node = node.parent) {
+    if (node.type.is('$CtrlSeq') && !node.type.is('$CtrlSym')) {
+      const name = state.sliceDoc(node.from, node.to)
+      return name.length > 0 ? name : null
+    }
+  }
+  return null
+}