Local Go playground in emacs

go.el

(defun go-create-playground ()
  "Creates a new temporary file with a skeletal Go application"
  (interactive)
  (let ((filename (make-temp-file "go-play-" nil ".go")))
    (find-file filename)
    (rename-buffer (generate-new-buffer-name "Go Playground"))
    (insert (concat "package main\n\nimport (\n\t\"fmt\"\n)\n\nfunc main() {\n\tfmt.Println(\"This file is located in " filename "\")\n}"))
    (save-buffer)
    (previous-line)
    (end-of-line)
    (insert "\n\t")
    (go-mode)))

(defun go-switch-to-playground ()
  "Switch to Go Playground buffer, creating if necessary"
  (interactive)
  (let ((playground (get-buffer "Go Playground")))
    (if playground
	(switch-to-buffer playground)
      (go-create-playground))))

(global-set-key (kbd "C-c C-g p") 'go-switch-to-playground)
(global-set-key (kbd "C-c C-g n") 'go-create-playground)