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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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7 ;; Version: 0.2
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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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48 ;; Emacs 19.34 and later.
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49
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50
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51 ;;; Code:
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52
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53 (require 'custom)
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54
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55 ;; User variables
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56
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57 (defgroup savehist nil
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58 "Save minibuffer history."
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59 :group 'minibuffer)
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60
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61
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62 (defcustom savehist-history-variables
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63 '(
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64 ;; Catch-all minibuffer history
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65 minibuffer-history
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66 ;; File-oriented commands
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67 file-name-history
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68 ;; Regexp-related reads
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69 regexp-history
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70 ;; Searches in minibuffer (via `M-r' and such)
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71 minibuffer-history-search-history
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72 ;; Query replace
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73 query-replace-history
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74 ;; eval-expression (`M-:')
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75 read-expression-history
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76 ;; shell-command (`M-!')
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77 shell-command-history
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78 ;; Viper stuff
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79 vip-ex-history vip-search-history
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80 vip-replace1-history vip-replace2-history
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81 vip-shell-history vip-search-history
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82
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83 ;; XEmacs-specific:
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84 ;; Buffer-related commands
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85 buffer-history
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86 ;; Reads of variables and functions
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87 variable-history function-history
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88 ;; Extended commands
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89 read-command-history
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90
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91 ;; GNU Emacs-specific:
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92 ;; Extended commands
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93 extended-command-history
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94
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95 ;; This is not a list, but it's cool to have it anyway, since it's
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96 ;; minibuffer history too.
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97 compile-command)
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98 "*List of symbols to be saved.
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99 Every symbol should refer to a variable. The variable will be saved only
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100 if it is bound is bound, and has a non-nil value. Thus it is safe to
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101 specify a superset of the variables a user is expected to want to save.
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102
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103 Default value contains minibuffer history variables used by XEmacs, GNU
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104 Emacs and Viper (uh-oh). `compile-command' was added for good measure."
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105 :type '(repeat (symbol :tag "Variable"))
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106 :group 'minibuffer)
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107
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108 (defcustom savehist-file "~/.emacs-history"
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109 "*File name to save minibuffer history to.
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110 The minibuffer history is a series of Lisp expressions, which should be
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111 loaded using `savehist-load' from your .emacs. See `savehist-load' for
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112 more details."
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113 :type 'file
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114 :group 'savehist)
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115
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116 (defcustom savehist-length 100
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117 "*Maximum length of a minibuffer list.
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118 If set to nil, the length is unlimited."
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119 :type '(choice integer
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120 (const :tag "Unlimited" nil))
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121 :group 'savehist)
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122
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123
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124 ;; Functions
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125
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126 ;;;###autoload
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127 (defun savehist-load (&optional prefix)
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128 "Load the histories saved to `savehist-file'.
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129 Unless PREFIX is non-nil, the function will also add the save function to
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130 `kill-emacs-hook'.
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131
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132 This function should be normally used from your Emacs init file. Since it
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133 removes your current minibuffer histories (if any), it is unwise to call it
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134 at any other time."
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135 (interactive "P")
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136 (unless prefix
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137 (add-hook 'kill-emacs-hook 'savehist-save))
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138 (when (file-exists-p savehist-file)
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139 (load savehist-file)))
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140
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141 ;;;###autoload
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142 (defun savehist-save ()
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143 "Save the histories from `savehist-history-variables' to `savehist-file'.
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144 A variable will be saved if it is bound and non-nil."
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145 (interactive)
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146 (save-excursion
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147 ;; Is it wise to junk `find-file-hooks' just like that? How else
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148 ;; should I avoid font-lock et al.?
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149 (let ((find-file-hooks nil)
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150 (buffer-exists-p (get-file-buffer savehist-file)))
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151 (set-buffer (find-file-noselect savehist-file))
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152 (unwind-protect
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153 (progn
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154 (erase-buffer)
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155 (insert
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156 ";; -*- emacs-lisp -*-\n"
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157 ";; Minibuffer history file.\n\n"
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158 ";; This file is automatically generated by `savehist-save'"
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159 " or when\n"
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160 ";; exiting Emacs.\n"
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161 ";; Do not edit. Unless you really want to, that is.\n\n")
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162 (dolist (sym savehist-history-variables)
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163 (when (and (boundp sym)
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164 (symbol-value sym))
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165 (prin1
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166 `(setq ,sym (quote ,(savehist-delimit (symbol-value sym)
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167 savehist-length)))
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168 (current-buffer))
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169 (insert ?\n)))
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170 (save-buffer))
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171 (or buffer-exists-p
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172 (kill-buffer (current-buffer)))))))
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173
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174 ;; If ARG is a arg with less than N elements, return it, else return
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175 ;; its subsequence of N elements. If N is nil, always return ARG. If
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176 ;; ARG is not a list, just return it.
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177 (defun savehist-delimit (arg n)
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178 (if (and n
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179 (listp arg)
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180 (> (length arg) n))
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181 (subseq arg 0 n)
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182 arg))
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183
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184 (provide 'savehist)
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185
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186 ;;; savehist.el ends here
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