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153
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1 ;;; savehist.el --- Save minibuffer history
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2
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3 ;; Copyright (c) 1997 Free Software Foundation
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4
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5 ;; Author: Hrvoje Niksic <hniksic@srce.hr>
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6 ;; Keywords: minibuffer
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171
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7 ;; Version: 0.4
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153
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify
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12 ;; it under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful,
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17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 ;; GNU General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; Synched up with: not in FSF
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27
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28 ;;; Commentary:
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29
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30 ;; Many editors (e.g. Vim) have the feature of saving minibuffer
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31 ;; history to an external file after exit. This package provides the
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32 ;; same feature in Emacs. When Emacs is about the exit,
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33 ;; `savehist-save' will dump the contents of various minibuffer
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34 ;; histories (as determined by `savehist-history-variables') to a save
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35 ;; file (`~/.emacs-history' by default). Although the package was
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36 ;; designed for saving the minibuffer histories, any variables can be
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37 ;; saved that way.
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38
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39 ;; To use savehist, put the following to `~/.emacs':
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40 ;;
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41 ;; (require 'savehist)
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42 ;; (savehist-load)
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43
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44 ;; Be sure to have `savehist.el' in a directory that is in your
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45 ;; load-path, and byte-compile it.
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46
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47 ;; This code should work on XEmacs 19.14 and later, as well as GNU
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171
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48 ;; Emacs 19.34 and later. It requires the Customize library, however
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49 ;; (shipped with XEmacs 19.15 and later, and with GNU Emacs 20.x).
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153
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50
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51
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52 ;;; Code:
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53
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54 (require 'custom)
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55
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56 ;; User variables
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57
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58 (defgroup savehist nil
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59 "Save minibuffer history."
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60 :group 'minibuffer)
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61
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62
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63 (defcustom savehist-history-variables
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64 '(
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65 ;; Catch-all minibuffer history
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66 minibuffer-history
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67 ;; File-oriented commands
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68 file-name-history
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69 ;; Regexp-related reads
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70 regexp-history
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71 ;; Searches in minibuffer (via `M-r' and such)
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72 minibuffer-history-search-history
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73 ;; Query replace
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74 query-replace-history
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75 ;; eval-expression (`M-:')
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76 read-expression-history
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77 ;; shell-command (`M-!')
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78 shell-command-history
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157
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79 ;; compile
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80 compile-history
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81 ;; find-tag (`M-.')
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82 find-tag-history
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83 ;; grep
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84 grep-history
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153
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85 ;; Viper stuff
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86 vip-ex-history vip-search-history
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87 vip-replace1-history vip-replace2-history
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88 vip-shell-history vip-search-history
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89
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90 ;; XEmacs-specific:
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91 ;; Buffer-related commands
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92 buffer-history
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93 ;; Reads of variables and functions
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94 variable-history function-history
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95 ;; Extended commands
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96 read-command-history
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97
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98 ;; GNU Emacs-specific:
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99 ;; Extended commands
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157
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100 extended-command-history)
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153
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101 "*List of symbols to be saved.
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102 Every symbol should refer to a variable. The variable will be saved
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103 only if it is bound and has a non-nil value. Thus it is safe to
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104 specify a superset of the variables a user is expected to want to
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105 save.
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153
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106
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107 Default value contains minibuffer history variables used by XEmacs, GNU
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157
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108 Emacs and Viper (uh-oh)."
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153
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109 :type '(repeat (symbol :tag "Variable"))
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157
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110 :group 'savehist)
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111
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112 (defcustom savehist-file "~/.emacs-history"
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113 "*File name to save minibuffer history to.
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114 The minibuffer history is a series of Lisp expressions, which should be
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115 loaded using `savehist-load' from your .emacs. See `savehist-load' for
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116 more details."
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117 :type 'file
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118 :group 'savehist)
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119
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120 (defcustom savehist-length 100
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121 "*Maximum length of a minibuffer list.
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122 If set to nil, the length is unlimited."
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123 :type '(choice integer
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124 (const :tag "Unlimited" nil))
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125 :group 'savehist)
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126
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127 (defcustom savehist-modes 384
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171
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128 "*Default permissions of the history file.
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129 This is decimal, not octal. The default is 384 (0600 in octal)."
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157
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130 :type 'integer
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131 :group 'savehist)
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132
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153
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133
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134 ;; Functions
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135
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136 ;;;###autoload
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137 (defun savehist-load (&optional no-hook)
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138 "Load the minibuffer histories from `savehist-file'.
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139 Unless NO-HOOK is specified, the function will also add the save function
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140 to `kill-emacs-hook', thus ensuring that the minibuffer contents will be
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141 saved before leaving Emacs.
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142
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143 This function should be normally used from your Emacs init file. Since it
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144 removes your current minibuffer histories, it is unwise to call it at any
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145 other time."
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153
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146 (interactive "P")
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171
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147 (unless no-hook
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153
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148 (add-hook 'kill-emacs-hook 'savehist-save))
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157
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149 (load savehist-file t))
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153
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150
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151 ;;;###autoload
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152 (defun savehist-save ()
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153 "Save the histories from `savehist-history-variables' to `savehist-file'.
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154 A variable will be saved if it is bound and non-nil."
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155 (interactive)
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156 (save-excursion
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157 ;; Is it wise to junk `find-file-hooks' just like that? How else
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158 ;; should I avoid font-lock et al.?
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159 (let ((find-file-hooks nil)
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160 (buffer-exists-p (get-file-buffer savehist-file)))
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161 (set-buffer (find-file-noselect savehist-file))
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162 (unwind-protect
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163 (progn
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164 (erase-buffer)
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165 (insert
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166 ";; -*- emacs-lisp -*-\n"
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167 ";; Minibuffer history file.\n\n"
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168 ";; This file is automatically generated by `savehist-save'"
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169 " or when\n"
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170 ";; exiting Emacs.\n"
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171 ";; Do not edit. Unless you really want to, that is.\n\n")
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171
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172 (let ((print-length nil)
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173 (print-string-length nil)
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174 (print-level nil)
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175 (print-readably t))
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176 (dolist (sym savehist-history-variables)
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177 (when (and (boundp sym)
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178 (symbol-value sym))
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179 (prin1
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180 `(setq ,sym (quote ,(savehist-delimit (symbol-value sym)
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181 savehist-length)))
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182 (current-buffer))
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183 (insert ?\n))))
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157
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184 (save-buffer)
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185 (set-file-modes savehist-file savehist-modes))
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153
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186 (or buffer-exists-p
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187 (kill-buffer (current-buffer)))))))
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188
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157
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189 ;; If ARG is a list with less than N elements, return it, else return
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190 ;; its subsequence of N elements. If N is nil or ARG is not a list,
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191 ;; always return ARG.
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153
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192 (defun savehist-delimit (arg n)
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193 (if (and n
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194 (listp arg)
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195 (> (length arg) n))
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196 (subseq arg 0 n)
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197 arg))
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198
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199 (provide 'savehist)
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200
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201 ;;; savehist.el ends here
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