lsp: add 'Hexai: implement unit test' code action for Gov0.4.1

- Generate or append tests to _test.go
- Jump to generated test via showDocument (command + server-initiated)
- Document the feature in docs/go-unit-tests.md
- Prefix action titles with 'Hexai: '
- Bump version to 0.4.1

1 files changed, 35 insertions, 0 deletions

diff --git a/internal/lsp/handlers_execute.go b/internal/lsp/handlers_execute.go
new file mode 100644
index 0000000..2e3ec52
--- /dev/null
+++ b/internal/lsp/handlers_execute.go
@@ -0,0 +1,35 @@
+// Summary: ExecuteCommand handler to support post-edit navigation (jump to generated test).
+package lsp
+
+import (
+    "encoding/json"
+)
+
+func (s *Server) handleExecuteCommand(req Request) {
+    var p ExecuteCommandParams
+    if err := json.Unmarshal(req.Params, &p); err != nil {
+        s.reply(req.ID, nil, nil)
+        return
+    }
+    switch p.Command {
+    case "hexai.showDocument":
+        if len(p.Arguments) >= 2 {
+            uri, _ := p.Arguments[0].(string)
+            var r Range
+            // Convert second arg to Range via re-marshal to be robust across clients
+            if b, err := json.Marshal(p.Arguments[1]); err == nil {
+                _ = json.Unmarshal(b, &r)
+            }
+            if uri != "" {
+                s.clientShowDocument(uri, &r)
+            }
+        }
+        s.reply(req.ID, nil, nil)
+        return
+    default:
+        // Unknown command; no-op
+        s.reply(req.ID, nil, nil)
+        return
+    }
+}
+