Ensure that :w runs gist-mode-save-buffer in gist-mode buffers

emacs/init.org

@@ -153,6 +153,14 @@ Make undo not undo paragraphs at a time:
   (setq evil-want-fine-undo t)
 #+END_SRC
 
+Add a convenience function for making buffer-local ex-commands:
+#+BEGIN_SRC emacs-lisp
+  (defun evil-ex-define-local-cmd (cmd function)
+    (set (make-local-variable 'evil-ex-commands) (copy-tree evil-ex-commands))
+    (evil-ex-define-cmd cmd function))
+#+END_SRC
+
+
 ** evil-collection
 A collection of evil bindings for various modes
 #+BEGIN_SRC emacs-lisp
@@ -4626,7 +4634,11 @@ Add a function to power the [[https://orgmode.org/worg/org-contrib/alfred-org-ca
 * gist.el
 [[https://github.com/defunkt/gist.el][Integrate with GitHub gists]] from Emacs!
 #+BEGIN_SRC emacs-lisp
-  (use-package gist)
+  (use-package gist
+    :config
+    (add-hook 'gist-mode-hook
+	      (lambda ()
+		(evil-ex-define-local-cmd "w[rite]" 'gist-mode-save-buffer))))
 #+END_SRC
 
 * ffap