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+;;; savehist.el --- Save minibuffer history
+
+;; Copyright (c) 1997 Free Software Foundation
+
+;; Author: Hrvoje Niksic <hniksic@xemacs.org>
+;; Keywords: minibuffer
+;; Version: 0.4
+
+;; 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., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; This package provides the feature of saving minibuffer
+;; history to an external file after exit.  When Emacs is about the exit,
+;; `savehist-save' will dump the contents of various minibuffer
+;; histories (as determined by `savehist-history-variables') to a save
+;; file (`~/.emacs-history' by default).  Although the package was
+;; designed for saving the minibuffer histories, any variables can be
+;; saved that way.
+
+;; To use savehist, put the following to `~/.emacs':
+;;
+;; (require 'savehist)
+;; (savehist-load)
+
+;; Be sure to have `savehist.el' in a directory that is in your
+;; load-path, and byte-compile it.
+
+;;; Code:
+
+;; User variables
+
+(defgroup savehist nil
+  "Save minibuffer history."
+  :group 'minibuffer)
+
+
+(defcustom savehist-history-variables
+  '(
+    ;; Catch-all minibuffer history
+    minibuffer-history
+    ;; File-oriented commands
+    file-name-history
+    ;; Regexp-related reads
+    regexp-history
+    ;; Searches in minibuffer (via `M-r' and such)
+    minibuffer-history-search-history
+    ;; Query replace
+    query-replace-history
+    ;; eval-expression (`M-:')
+    read-expression-history
+    ;; shell-command (`M-!')
+    shell-command-history
+    ;; compile
+    compile-history
+    ;; find-tag (`M-.')
+    find-tag-history
+    ;; grep
+    grep-history
+    ;; Viper stuff
+    vip-ex-history vip-search-history
+    vip-replace1-history vip-replace2-history
+    vip-shell-history vip-search-history
+
+    ;; XEmacs-specific:
+    ;; Buffer-related commands
+    buffer-history
+    ;; Reads of variables and functions
+    variable-history function-history
+    ;; Extended commands
+    read-command-history
+
+    ;; Info, lookup, and bookmark historys
+    Info-minibuffer-history
+    Manual-page-minibuffer-history
+
+    ;; Emacs-specific:
+    ;; Extended commands
+    extended-command-history)
+  "*List of symbols to be saved.
+Every symbol should refer to a variable.  The variable will be saved
+only if it is bound and has a non-nil value.  Thus it is safe to
+specify a superset of the variables a user is expected to want to
+save.
+
+Default value contains minibuffer history variables used by Emacs, XEmacs, 
+and Viper (uh-oh)."
+  :type '(repeat (symbol :tag "Variable"))
+  :group 'savehist)
+
+(defcustom savehist-file "~/.emacs-history"
+  "*File name to save minibuffer history to.
+The minibuffer history is a series of Lisp expressions, which should be
+loaded using `savehist-load' from your .emacs.  See `savehist-load' for
+more details."
+  :type 'file
+  :group 'savehist)
+
+(defcustom savehist-length 100
+  "*Maximum length of a minibuffer list.
+If set to nil, the length is unlimited."
+  :type '(choice integer
+		 (const :tag "Unlimited" nil))
+  :group 'savehist)
+
+(defcustom savehist-modes 384
+  "*Default permissions of the history file.
+This is decimal, not octal.  The default is 384 (0600 in octal)."
+  :type 'integer
+  :group 'savehist)
+
+
+;; Functions
+
+;;;###autoload
+(defun savehist-load (&optional no-hook)
+  "Load the minibuffer histories from `savehist-file'.
+Unless NO-HOOK is specified, the function will also add the save function
+to `kill-emacs-hook', thus ensuring that the minibuffer contents will be
+saved before leaving Emacs.
+
+This function should be normally used from your Emacs init file.  Since it
+removes your current minibuffer histories, it is unwise to call it at any
+other time."
+  (interactive "P")
+  (unless no-hook
+    (add-hook 'kill-emacs-hook 'savehist-save))
+  (load savehist-file t))
+
+;;;###autoload
+(defun savehist-save ()
+  "Save the histories from `savehist-history-variables' to `savehist-file'.
+A variable will be saved if it is bound and non-nil."
+  (interactive)
+  (save-excursion
+    ;; Is it wise to junk `find-file-hooks' just like that?  How else
+    ;; should I avoid font-lock et al.?
+    (let ((find-file-hooks nil)
+	  (buffer-exists-p (get-file-buffer savehist-file)))
+      (set-buffer (find-file-noselect savehist-file))
+      (unwind-protect
+	  (progn
+	    (erase-buffer)
+	    (insert
+	     ";; -*- emacs-lisp -*-\n"
+	     ";; Minibuffer history file.\n\n"
+	     ";; This file is automatically generated by `savehist-save'"
+	     " or when\n"
+	     ";; exiting Emacs.\n"
+	     ";; Do not edit.  Unless you really want to, that is.\n\n")
+	    (let ((print-length nil)
+		  (print-string-length nil)
+		  (print-level nil)
+		  (print-readably t))
+	      (dolist (sym savehist-history-variables)
+		(when (and (boundp sym)
+			   (symbol-value sym))
+		  (prin1
+		   `(setq ,sym (quote ,(savehist-delimit (symbol-value sym)
+							 savehist-length)))
+		   (current-buffer))
+		  (insert ?\n))))
+	    (save-buffer)
+	    (set-file-modes savehist-file savehist-modes))
+	(or buffer-exists-p
+	    (kill-buffer (current-buffer)))))))
+
+;; If ARG is a list with less than N elements, return it, else return
+;; its subsequence of N elements.  If N is nil or ARG is not a list,
+;; always return ARG.
+(defun savehist-delimit (arg n)
+  (if (and n
+	   (listp arg)
+	   (> (length arg) n))
+      (subseq arg 0 n)
+    arg))
+
+(provide 'savehist)
+
+;;; savehist.el ends here