init-ido.el

;; Use C-f during file selection to switch to regular find-file
(require 'ido-ubiquitous)
(ido-mode t)  ; use 'buffer rather than t to use only buffer switching
(ido-everywhere t)
;(ido-ubiquitous-mode t)
(setq ido-enable-flex-matching t)
(setq ido-use-filename-at-point nil)
(setq ido-auto-merge-work-directories-length 0)
(setq ido-use-virtual-buffers t)

;; Allow the same buffer to be open in different frames
(setq ido-default-buffer-method 'selected-window)

(defun steve-ido-choose-from-recentf ()
  "Use ido to select a recently opened file from the `recentf-list'"
  (interactive)
  (if (and ido-use-virtual-buffers (fboundp 'ido-toggle-virtual-buffers))
      (ido-switch-buffer)
    (find-file (ido-completing-read "Open file: " recentf-list nil t))))

(global-set-key [(meta f11)] 'steve-ido-choose-from-recentf)

(defun ido-goto-symbol (&optional symbol-list)
  "Refresh imenu and jump to a place in the buffer using Ido."
  (interactive)
  (unless (featurep 'imenu)
    (require 'imenu nil t))
  (cond
   ((not symbol-list)
    (let ((ido-mode ido-mode)
          (ido-enable-flex-matching
           (if (boundp 'ido-enable-flex-matching)
               ido-enable-flex-matching t))
          name-and-pos symbol-names position)
      (unless ido-mode
        (ido-mode 1)
        (setq ido-enable-flex-matching t))
      (while (progn
               (imenu--cleanup)
               (setq imenu--index-alist nil)
               (ido-goto-symbol (imenu--make-index-alist))
               (setq selected-symbol
                     (ido-completing-read "Symbol? " symbol-names))
               (string= (car imenu--rescan-item) selected-symbol)))
      (unless (and (boundp 'mark-active) mark-active)
        (push-mark nil t nil))
      (setq position (cdr (assoc selected-symbol name-and-pos)))
      (cond
       ((overlayp position)
        (goto-char (overlay-start position)))
       (t
        (goto-char position)))))
   ((listp symbol-list)
    (dolist (symbol symbol-list)
      (let (name position)
        (cond
         ((and (listp symbol) (imenu--subalist-p symbol))
          (ido-goto-symbol symbol))
         ((listp symbol)
          (setq name (car symbol))
          (setq position (cdr symbol)))
         ((stringp symbol)
          (setq name symbol)
          (setq position
                (get-text-property 1 'org-imenu-marker symbol))))
        (unless (or (null position) (null name)
                    (string= (car imenu--rescan-item) name))
          (add-to-list 'symbol-names name)
          (add-to-list 'name-and-pos (cons name position))))))))

(global-set-key "\C-ci" 'ido-goto-symbol) ; or any key you see fit

;;----------------------------------------------------------------------------
;; ido completion in M-x
;;----------------------------------------------------------------------------
(smex-initialize)
(global-set-key "\M-x" 'smex)


(provide 'init-ido)