Emacs: Open Last Closed File 🚀

By Xah Lee. Date: . Last updated: .

This page shows a command to open last closed file.

put them in your Emacs Init File:

(defvar xah-recently-closed-buffers nil "alist of recently closed buffers. Each element is (buffer name, file path). The max number to track is controlled by the variable `xah-recently-closed-buffers-max'.")

(defvar xah-recently-closed-buffers-max 40 "The maximum length for `xah-recently-closed-buffers'.")
(defun xah-close-current-buffer ()
  "Close the current buffer.

Similar to `kill-buffer', with the following addition:

• Prompt user to save if the buffer has been modified even if the buffer is not associated with a file.
• If the buffer is editing a source file in an `org-mode' file, prompt the user to save before closing.
• If the buffer is a file, add the path to the list `xah-recently-closed-buffers'.

URL `http://xahlee.info/emacs/emacs/elisp_close_buffer_open_last_closed.html'
Version: 2016-06-19 2021-07-01 2022-03-22 2022-05-13"
  (let (($isOrgMode (string-match "^*Org Src" (buffer-name))))
    (if (active-minibuffer-window) ; if the buffer is minibuffer
        ;; (string-equal major-mode "minibuffer-inactive-mode")
        ;; Offer to save buffers that are non-empty and modified, even for non-file visiting buffer. (Because `kill-buffer' does not offer to save buffers that are not associated with files.)
        (when (and (buffer-modified-p)
                   (not (string-equal major-mode "dired-mode"))
                   (if (equal (buffer-file-name) nil)
                       (if (string-equal "" (save-restriction (widen) (buffer-string))) nil t)
          (if (y-or-n-p (format "Buffer %s modified; Do you want to save? " (buffer-name)))
            (set-buffer-modified-p nil)))
        (when (and (buffer-modified-p)
          (if (y-or-n-p (format "Buffer %s modified; Do you want to save? " (buffer-name)))
            (set-buffer-modified-p nil)))
        ;; save to a list of closed buffer
        (when (buffer-file-name)
          (setq xah-recently-closed-buffers
                (cons (cons (buffer-name) (buffer-file-name)) xah-recently-closed-buffers))
          (when (> (length xah-recently-closed-buffers) xah-recently-closed-buffers-max)
            (setq xah-recently-closed-buffers (butlast xah-recently-closed-buffers 1))))
        (kill-buffer (current-buffer))))))

Here's commands to open last closed file.

(defun xah-open-last-closed ()
  "Open the last closed file.
URL `http://xahlee.info/emacs/emacs/elisp_close_buffer_open_last_closed.html'
Version: 2016-06-19"
  (if (> (length xah-recently-closed-buffers) 0)
      (find-file (cdr (pop xah-recently-closed-buffers)))
    (progn (message "No recently close buffer in this session."))))

(defun xah-open-recently-closed ()
  "Open recently closed file.
Prompt for a choice.

URL `http://xahlee.info/emacs/emacs/elisp_close_buffer_open_last_closed.html'
Version: 2016-06-19 2021-10-27 2022-04-07"
  (find-file (completing-read "Open:" (mapcar (lambda (f) (cdr f)) xah-recently-closed-buffers))))

(defun xah-list-recently-closed ()
  "List recently closed file.

URL `http://xahlee.info/emacs/emacs/elisp_close_buffer_open_last_closed.html'
Version: 2016-06-19"
  (let (($buf (generate-new-buffer "*recently closed*")))
    (switch-to-buffer $buf)
    (mapc (lambda ($f) (insert (cdr $f) "\n"))

Give these commands keys:

(global-set-key (kbd "C-x k") 'xah-close-current-buffer)
(global-set-key (kbd "C-S-t") 'xah-open-last-closed) ; control+shift+t

[see Emacs: How to Define Keybinding]