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1 ;;; chistory.el --- list command history
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2
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3 ;; Copyright (C) 1985 Free Software Foundation, Inc.
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4
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5 ;; Author: K. Shane Hartman
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6 ;; Maintainer: FSF
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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2
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24 ;;; Synched up with: FSF 19.34.
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0
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25
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26 ;;; Commentary:
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27
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28 ;; This really has nothing to do with list-command-history per se, but
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29 ;; its a nice alternative to C-x ESC ESC (repeat-complex-command) and
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30 ;; functions as a lister if given no pattern. It's not important
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31 ;; enough to warrant a file of its own.
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32
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33 ;;; Code:
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34
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35 (defvar command-history-map nil)
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36
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37 (defvar command-history-hook nil
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38 "If non-nil, its value is called on entry to `command-history-mode'.")
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39
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40 ;;;###autoload
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41 (defun repeat-matching-complex-command (&optional pattern)
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42 "Edit and re-evaluate complex command with name matching PATTERN.
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43 Matching occurrences are displayed, most recent first, until you select
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44 a form for evaluation. If PATTERN is empty (or nil), every form in the
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45 command history is offered. The form is placed in the minibuffer for
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46 editing and the result is evaluated."
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47 (interactive "sRedo Command (regexp): ")
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48 (if pattern
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49 (if (string-match "[^ \t]" pattern)
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50 (setq pattern (substring pattern (match-beginning 0)))
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51 (setq pattern nil)))
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52 (let ((history command-history)
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53 (temp)
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54 (what))
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55 (while (and history (not what))
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56 (setq temp (car history))
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57 (if (and (or (not pattern) (string-match pattern (symbol-name (car temp))))
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58 (y-or-n-p (format "Redo %S? " temp)))
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59 (setq what (car history))
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60 (setq history (cdr history))))
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61 (if (not what)
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62 (error "Command history exhausted")
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63 ;; Try to remove any useless command history element for this command.
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64 (if (eq (car (car command-history)) 'repeat-matching-complex-command)
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65 (setq command-history (cdr command-history)))
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66 (edit-and-eval-command "Redo: " what))))
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67
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68 (defvar default-command-history-filter-garbage
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69 '(command-history-mode
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70 list-command-history
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71 electric-command-history)
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72 "*A list of symbols to be ignored by `default-command-history-filter'.
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73 It that function is given a list whose car is an element of this list,
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74 then it will return non-nil (indicating the list should be discarded from
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75 the history).
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76 Initially, all commands related to the command history are discarded.")
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77
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78 (defvar list-command-history-filter 'default-command-history-filter
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79 "Predicate to test which commands should be excluded from the history listing.
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80 If non-nil, should be the name of a function of one argument.
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81 It is passed each element of the command history when
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82 \\[list-command-history] is called. If the filter returns non-nil for
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83 some element, that element is excluded from the history listing. The
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84 default filter removes commands associated with the command-history.")
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85
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86 (defun default-command-history-filter (frob)
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87 "Filter commands matching `default-command-history-filter-garbage' list
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88 from the command history."
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89 (or (not (consp frob))
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90 (memq (car frob) default-command-history-filter-garbage)))
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91
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92 (defvar list-command-history-max 32
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93 "*If non-nil, maximum length of the listing produced by `list-command-history'.")
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94
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95 ;;;###autoload
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96 (defun list-command-history ()
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97 "List history of commands typed to minibuffer.
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98 The number of commands listed is controlled by `list-command-history-max'.
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99 Calls value of `list-command-history-filter' (if non-nil) on each history
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100 element to judge if that element should be excluded from the list.
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101
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102 The buffer is left in Command History mode."
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103 (interactive)
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104 (with-output-to-temp-buffer
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105 "*Command History*"
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106 (let ((history command-history)
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107 (buffer-read-only nil)
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108 (count (or list-command-history-max -1)))
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109 (while (and (/= count 0) history)
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110 (if (and (boundp 'list-command-history-filter)
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111 list-command-history-filter
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112 (funcall list-command-history-filter (car history)))
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113 nil
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114 (setq count (1- count))
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115 (prin1 (car history))
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116 (terpri))
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117 (setq history (cdr history))))
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118 (save-excursion
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119 (set-buffer "*Command History*")
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120 (goto-char (point-min))
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121 (if (eobp)
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122 (error "No command history")
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123 (Command-history-setup)))))
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124
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125 (defun Command-history-setup (&optional majormode modename keymap)
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126 (set-buffer "*Command History*")
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127 (use-local-map (or keymap command-history-map))
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128 (lisp-mode-variables nil)
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129 (set-syntax-table emacs-lisp-mode-syntax-table)
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130 (setq buffer-read-only t)
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131 (use-local-map (or keymap command-history-map))
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132 (setq major-mode (or majormode 'command-history-mode))
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133 (setq mode-name (or modename "Command History")))
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134
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135 (if command-history-map
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136 nil
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137 (setq command-history-map (make-sparse-keymap))
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138 (set-keymap-parent command-history-map shared-lisp-mode-map)
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139 (set-keymap-name command-history-map 'command-history-map)
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140 (suppress-keymap command-history-map)
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141 (define-key command-history-map "x" 'command-history-repeat)
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142 (define-key command-history-map "\n" 'next-line)
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143 (define-key command-history-map "\r" 'next-line)
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144 (define-key command-history-map "\177" 'previous-line))
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145
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146 (defun command-history-repeat ()
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147 "Repeat the command shown on the current line.
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148 The buffer for that command is the previous current buffer."
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149 (interactive)
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150 (save-excursion
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151 (eval (prog1
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152 (save-excursion
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153 (beginning-of-line)
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154 (read (current-buffer)))
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155 (set-buffer
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156 (car (cdr (buffer-list))))))))
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157
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158 ;;;###autoload
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159 (defun command-history-mode ()
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160 "Major mode for examining commands from `command-history'.
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161 The number of commands listed is controlled by `list-command-history-max'.
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162 The command history is filtered by `list-command-history-filter' if non-nil.
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163 Use \\<command-history-map>\\[command-history-repeat] to repeat the command on the current line.
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164
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165 Otherwise much like Emacs-Lisp Mode except that there is no self-insertion
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166 and digits provide prefix arguments. Tab does not indent.
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167 \\{command-history-map}
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168 Calls the value of `command-history-hook' if that is non-nil.
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169 The Command History listing is recomputed each time this mode is invoked."
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170 (interactive)
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171 (list-command-history)
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172 (pop-to-buffer "*Command History*")
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173 (run-hooks 'command-history-hook))
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174
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175 (provide 'chistory)
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176
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177 ;;; chistory.el ends here
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