Ido 的按键设置

新的 ido.el 不能在 Emacs 21.3 里使用，所以在旧的 ido.el 里加入：

(defun ido-restrict-to-matches ()
  "Set current item list to the currently matched items."
  (interactive)
  (when ido-matches
    (setq ido-cur-list ido-matches
	  ido-text-init ""
	  ido-rescan nil
	  ido-exit 'keep)
    (exit-minibuffer)))

就能得到 ido-restrict-to-matches 的功能，可以逐步筛选匹配的 文件！

ido 缺省的按键设置不顺手，改为：

(add-hook 'ido-define-mode-map-hook 'ido-my-keys)

(defun ido-my-keys ()
  "Set up the keymap for `ido'."

  ;; common keys
  (define-key ido-mode-map "\C-e" 'ido-edit-input)   
  (define-key ido-mode-map "\t" 'ido-complete) ;; complete partial
  (define-key ido-mode-map "\C-j" 'ido-select-text)
  (define-key ido-mode-map "\C-m" 'ido-exit-minibuffer)
  (define-key ido-mode-map "?" 'ido-completion-help) ;; list completions
  (define-key ido-mode-map [(control ? )] 'ido-restrict-to-matches)
  (define-key ido-mode-map [(control ?@)] 'ido-restrict-to-matches)

  ;; cycle through matches
  (define-key ido-mode-map "\C-r" 'ido-prev-match)
  (define-key ido-mode-map "\C-s" 'ido-next-match)
  (define-key ido-mode-map [right] 'ido-next-match)
  (define-key ido-mode-map [left] 'ido-prev-match)

  ;; toggles
  (define-key ido-mode-map "\C-t" 'ido-toggle-regexp) ;; same as in isearch
  (define-key ido-mode-map "\C-p" 'ido-toggle-prefix)
  (define-key ido-mode-map "\C-c" 'ido-toggle-case)
  (define-key ido-mode-map "\C-a" 'ido-toggle-ignore)

  ;; keys used in file and dir environment
  (when (memq ido-cur-item '(file dir))
    (define-key ido-mode-map "\C-b" 'ido-enter-switch-buffer)
    (define-key ido-mode-map "\C-d" 'ido-enter-dired)
    (define-key ido-mode-map "\C-f" 'ido-fallback-command)

    ;; cycle among directories
    ;; use [left] and [right] for matching files
    (define-key ido-mode-map [down] 'ido-next-match-dir)
    (define-key ido-mode-map [up]   'ido-prev-match-dir)

    ;; backspace functions
    (define-key ido-mode-map [backspace] 'ido-delete-backward-updir)
    (define-key ido-mode-map "\d"        'ido-delete-backward-updir)
    (define-key ido-mode-map [(meta backspace)] 'ido-delete-backward-word-updir)
    (define-key ido-mode-map [(control backspace)] 'ido-up-directory)

    ;; I can't understand this
    (define-key ido-mode-map [(meta ?d)] 'ido-wide-find-dir)
    (define-key ido-mode-map [(meta ?f)] 'ido-wide-find-file)
    (define-key ido-mode-map [(meta ?k)] 'ido-forget-work-directory)
    (define-key ido-mode-map [(meta ?m)] 'ido-make-directory)

    (define-key ido-mode-map [(meta down)] 'ido-next-work-directory)
    (define-key ido-mode-map [(meta up)] 'ido-prev-work-directory)
    (define-key ido-mode-map [(meta left)] 'ido-prev-work-file)
    (define-key ido-mode-map [(meta right)] 'ido-next-work-file)

    ;; search in the directories
    ;; use C-_ to undo this
    (define-key ido-mode-map [(meta ?s)] 'ido-merge-work-directories)
    (define-key ido-mode-map [(control ?\_)] 'ido-undo-merge-work-directory)
    )

  (when (eq ido-cur-item 'file)
    (define-key ido-mode-map "\C-k" 'ido-delete-file-at-head)
    (define-key ido-mode-map "\C-l" 'ido-toggle-literal)
    (define-key ido-mode-map "\C-o" 'ido-copy-current-word)
    (define-key ido-mode-map "\C-v" 'ido-toggle-vc)
    (define-key ido-mode-map "\C-w" 'ido-copy-current-file-name)
    )

  (when (eq ido-cur-item 'buffer)
    (define-key ido-mode-map "\C-b" 'ido-fallback-command)
    (define-key ido-mode-map "\C-f" 'ido-enter-find-file)
    (define-key ido-mode-map "\C-k" 'ido-kill-buffer-at-head)
    ))

(ido-mode t)