在任何 mode 下都可以使用像 org-mode 的 easy-template 進行補全

org-mode 的 easy-template 提供使用者輸入 <e 再按下 TAB 就可以進行自動補全的功能, 為了在任意模式下都可以辦到如同 org-mode 的 easy template 的功能, 首先先將以下程式碼加入你的 .emacs 設定後，

(defadvice yas-expand (around coldnew/major-mode-expand activate)
  "Try to complete a structure template before point like org-mode does.
This looks for strings like \"<e\" on an otherwise empty line and
expands them.

Before use this function, you must setup `major-mode-name'-expand-alist variable.
Take emacs-lisp-mode as example, if you wand to use <r to expand your snippet `require'
in yasnippet, you muse setup the emacs-lisp-mode-expand-alist variable.

(setq emacs-lisp-expand-alist '((\"r\" . \"require\")))

"
  (let* ((l (buffer-substring (point-at-bol) (point)))
         (expand-symbol (intern (concat (symbol-name major-mode) "-expand-alist")))
         (expand-alist (if (boundp expand-symbol) (symbol-value expand-symbol) nil))
         a)
    (when (and (looking-at "[ \t]*$")
               (string-match "^[ \t]*<\\([a-zA-Z]+\\)$" l)
               (setq a (assoc (match-string 1 l) expand-alist)))
      (backward-delete-char (1+ (length (car-safe a))))
      (if (symbolp (cdr-safe a))
          (funcall (cdr-safe a))
        (insert (cdr-safe a)))
      t)
    ad-do-it))

假如希望在 emacs-lisp-mode 輸入 <r 再按下 TAB 就可以使用 yasnippet 展開 require 的 snippet, 則添加以下程式

(setq emacs-lisp-mode-expand-alist '(("r" . "require")))

注意到 major-mode 是什麼，則添加相對應的 major-mode-expand-alist, 比如 major-mode 是 c-mode 則加入

(setq c-mode-expand-alist '(("i" . "include")))

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