New file. Setup a menu of recently opened files

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diff --git a/lisp/recentf.el b/lisp/recentf.el
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+;; recentf.el --- setup a menu of recently opened files
+
+;; Copyright (C) 1999 Free Software Foundation, Inc.
+
+;; Author: David Ponce <[email protected]>
+;; Created: July 19 1999
+;; Keywords: customization
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'easymenu)
+
+(defconst recentf-save-file-header
+  ";;; Automatically generated by `recentf' on %s.\n"
+  "Header to be written into the `recentf-save-file'.")
+
+(defvar recentf-list nil
+  "List of recently opened files.")
+
+(defvar recentf-update-menu-p t
+  "Non-nil if the recentf menu must be updated.")
+
+(defvar recentf-initialized-p nil
+  "Non-nil if recentf already initialized.")
+
+;; IMPORTANT: This function must be defined before the following defcustoms
+;; because it is used in their :set clause. To avoid byte-compiler warnings
+;; the `symbol-value' function is used to access the `recentf-menu-path'
+;; and `recentf-menu-title' values.
+(defun recentf-menu-customization-changed (sym val)
+  "Function called when menu customization has changed.
+It removes the recentf menu and forces its complete redrawing."
+  (when recentf-initialized-p
+    (easy-menu-remove-item nil 
+                           (symbol-value 'recentf-menu-path)
+                           (symbol-value 'recentf-menu-title))
+    (setq recentf-update-menu-p t))
+  (custom-set-default sym val))
+
+(defgroup recentf nil
+  "Maintain a menu of recently opened files."
+  :group 'files)
+
+(defcustom recentf-max-saved-items 20
+  "*Maximum number of items saved to `recentf-save-file'."
+  :group 'recentf
+  :type 'integer)
+
+(defcustom recentf-save-file (expand-file-name "~/.recentf")
+  "*File to save `recentf-list' into."
+  :group 'recentf
+  :type 'file)
+
+(defcustom recentf-exclude nil
+  "*List of regexps for filenames excluded from `recentf-list'."
+  :group 'recentf
+  :type '(repeat regexp))
+
+(defcustom recentf-menu-title "Open Recent"
+  "*Name of the recentf menu."
+  :group 'recentf
+  :type 'string
+  :set 'recentf-menu-customization-changed)
+
+(defcustom recentf-menu-path '("files")
+  "*Path where to add the recentf menu.
+If nil add it at top-level (see also `easy-menu-change')."
+  :group 'recentf
+  :type '(choice (const :tag "Top Level" nil)
+                 (sexp :tag "Menu Path"))
+  :set 'recentf-menu-customization-changed)
+
+(defcustom recentf-menu-before "open-file"
+  "*Name of the menu before which the recentf menu will be added.
+If nil add it at end of menu (see also `easy-menu-change')."
+  :group 'recentf
+  :type '(choice (string :tag "Name")
+                 (const :tag "Last" nil))
+  :set 'recentf-menu-customization-changed)
+
+(defcustom recentf-menu-action 'recentf-find-file
+  "*Function to invoke with a filename item of the recentf menu.
+The default action `recentf-find-file' calls `find-file' to edit an
+existing file.  If the file does not exist or is not readable, it is
+not edited and its name is removed from `recentf-list'. You can use
+`find-file' instead to open non-existing files and keep them is the
+list of recently opened files."
+  :group 'recentf
+  :type 'function
+  :set 'recentf-menu-customization-changed)
+
+(defcustom recentf-max-menu-items 10
+  "*Maximum number of items in the recentf menu."
+  :group 'recentf
+  :type 'integer
+  :set 'recentf-menu-customization-changed)
+
+(defcustom recentf-menu-filter nil
+  "*Function used to filter files displayed in the recentf menu.
+Nil means no filter.  The following functions are predefined:
+
+- - `recentf-sort-ascending' to sort menu items in ascending order.
+- - `recentf-sort-descending' to sort menu items in descending order.
+
+The filter function is called with one argument, the list of filenames to be
+displayed in the menu and must return a new list of filenames."
+  :group 'recentf
+  :type 'function
+  :set 'recentf-menu-customization-changed)
+
+(defcustom recentf-menu-append-commands-p t
+  "*If not-nil command items are appended to the menu."
+  :group 'recentf
+  :type 'boolean
+  :set 'recentf-menu-customization-changed)
+
+(defcustom recentf-keep-non-readable-files-p nil
+  "*If nil (default), non-readable files are not kept in `recentf-list'."
+  :group 'recentf
+  :type 'boolean
+  :set  '(lambda (sym val)
+           (if val
+               (remove-hook kill-buffer-hook recentf-remove-file-hook)
+             (add-hook kill-buffer-hook recentf-remove-file-hook))
+           (custom-set-default sym val)))
+
+(defcustom recentf-mode nil
+  "Toggle recentf mode.
+When recentf mode is enabled, it maintains a menu for visiting files that
+were operated on recently.
+Setting this variable directly does not take effect;
+use either \\[customize] or the function `recentf-mode'."
+  :set (lambda (symbol value)
+         (recentf-mode (or value 0)))
+  :initialize 'custom-initialize-default
+  :type 'boolean
+  :group 'recentf
+  :require 'recentf)
+
+(defcustom recentf-load-hook nil
+   "*Normal hook run at end of loading the `recentf' package."
+  :group 'recentf
+  :type 'hook)
+
+;;;###autoload
+(defun recentf-mode (&optional arg)
+  "Toggle recentf mode.
+With prefix ARG, turn recentf mode on if and only if ARG is positive.
+Returns the new status of recentf mode (non-nil means on).
+
+When recentf mode is enabled, it maintains a menu for visiting files that
+were operated on recently."
+  (interactive "P")
+  (when window-system
+    (let ((on-p (if arg
+                    (> (prefix-numeric-value arg) 0)
+                  (not recentf-mode))))
+      (if on-p
+          (unless recentf-initialized-p
+            (setq recentf-initialized-p t)
+            (if (file-readable-p recentf-save-file)
+                (load-file recentf-save-file))
+            (setq recentf-update-menu-p t)
+            (add-hook 'find-file-hooks       'recentf-add-file-hook)
+            (add-hook 'write-file-hooks      'recentf-add-file-hook)
+            ;;    (add-hook 'activate-menubar-hook 'recentf-update-menu-hook)
+            (add-hook 'menu-bar-update-hook  'recentf-update-menu-hook)
+            (add-hook 'kill-emacs-hook       'recentf-save-list))
+        (when recentf-initialized-p
+          (setq recentf-initialized-p nil)
+          (recentf-save-list)
+          (easy-menu-remove-item nil recentf-menu-path recentf-menu-title)
+          (remove-hook 'find-file-hooks       'recentf-add-file-hook)
+          (remove-hook 'write-file-hooks      'recentf-add-file-hook)
+          ;;    (remove-hook 'activate-menubar-hook 'recentf-update-menu-hook)
+          (remove-hook 'menu-bar-update-hook  'recentf-update-menu-hook)
+          (remove-hook 'kill-emacs-hook       'recentf-save-list)))
+      (setq recentf-mode on-p))))
+
+(defun recentf-add-file-hook ()
+  "Insert the name of the file just opened or written into `recentf-list'."
+  (and buffer-file-name (recentf-add-file buffer-file-name))
+  nil)
+
+(defun recentf-remove-file-hook ()
+  "When a buffer is killed remove a non readable file from `recentf-list'."
+  (and buffer-file-name (recentf-remove-if-non-readable buffer-file-name))
+  nil)
+
+(defun recentf-update-menu-hook ()
+  "Update the recentf menu from the current `recentf-list'."
+  (when recentf-update-menu-p
+    (condition-case nil
+        (progn
+          (easy-menu-change recentf-menu-path
+                            recentf-menu-title
+                            (recentf-make-menu-items)
+                            recentf-menu-before)
+          (setq recentf-update-menu-p nil))
+      (error nil))))
+
+;;;###autoload
+(defun recentf-save-list ()
+  "Save the current `recentf-list' to the file `recentf-save-file'."
+  (interactive)
+  (let ((saved-list (recentf-elements recentf-max-saved-items)))
+    (with-temp-buffer
+      (erase-buffer)
+      (insert (format recentf-save-file-header (current-time-string)))
+      (insert "(setq recentf-list\n      '(\n")
+      (mapcar '(lambda (e)
+                 (insert (format "        %S\n" e)))
+              saved-list)
+      (insert "        ))")
+      (if (file-writable-p recentf-save-file)
+          (write-region (point-min) (point-max) recentf-save-file))
+      (kill-buffer (current-buffer))))
+  nil)
+
+;;;###autoload
+(defun recentf-cleanup ()
+  "Remove all non-readable files from `recentf-list'."
+  (interactive)
+  (setq recentf-list (delq nil (mapcar '(lambda (f)
+                                          (and (file-readable-p f) f))
+                                       recentf-list)))
+  (setq recentf-update-menu-p t))
+
+(defvar recentf-menu-items-for-commands
+  (list ["Cleanup list" recentf-cleanup t]
+        ["Save list now" recentf-save-list t]
+        (vector (format "Recentf Options...")
+                '(customize-group "recentf") t))
+  "List of menu items for recentf commands.")
+
+(defun recentf-make-menu-items ()
+  "Make menu items from `recentf-list'."
+  (let ((file-items
+	 (mapcar '(lambda (entry)
+		    (vector entry (list recentf-menu-action entry) t))
+		 (funcall (or recentf-menu-filter 'identity)
+			  (recentf-elements recentf-max-menu-items)))))
+    (append (or file-items (list ["No files" t nil]))
+            (and recentf-menu-append-commands-p
+                 (cons ["---" nil nil]
+                       recentf-menu-items-for-commands)))))
+
+(defun recentf-add-file (filename)
+  "Add or move FILENAME at the beginning of `recentf-list'.
+Does nothing if FILENAME matches one of the `recentf-exclude' regexps."
+  (when (recentf-include-p filename)
+    (setq recentf-list (cons filename (delete filename recentf-list)))
+    (setq recentf-update-menu-p t)))
+
+(defun recentf-remove-if-non-readable (filename)
+  "Remove FILENAME from `recentf-list' if not readable."
+  (unless (file-readable-p filename)
+    (setq recentf-list (delete filename recentf-list))
+    (setq recentf-update-menu-p t)))
+
+(defun recentf-find-file (filename)
+  "Edit file FILENAME using `find-file'.
+If FILENAME is not readable it is removed from `recentf-list'."
+  (if (file-readable-p filename)
+      (find-file filename)
+    (progn
+      (message "File `%s' not found." filename)
+      (setq recentf-list (delete filename recentf-list))
+      (setq recentf-update-menu-p t))))
+
+(defun recentf-include-p (filename)
+  "Return t if FILENAME matches none of the `recentf-exclude' regexps."
+  (let ((rl recentf-exclude))
+    (while (and rl (not (string-match (car rl) filename)))
+      (setq rl (cdr rl)))
+    (null rl)))
+
+(defun recentf-elements (n)
+  "Return a list of the first N elements of `recentf-list'."
+  (let ((lh nil) (l recentf-list))
+    (while (and l (> n 0))
+      (setq lh (cons (car l) lh))
+      (setq n (1- n))
+      (setq l (cdr l)))
+    (nreverse lh)))
+
+(defun recentf-sort-ascending (l)
+  "Sort the list of strings L in ascending order."
+  (sort l '(lambda (e1 e2) (string-lessp e1 e2))))
+
+(defun recentf-sort-descending (l)
+  "Sort the list of strings L in descending order."
+  (sort l '(lambda (e1 e2) (string-lessp e2 e1))))
+
+(provide 'recentf)
+
+(run-hooks 'recentf-load-hook)
+
+;;; recentf.el ends here.