lisp/chistory.el

   1 ;;; chistory.el --- list command history
   2
   3 ;; Copyright (C) 1985 Free Software Foundation, Inc.
   4
   5 ;; Author: K. Shane Hartman
   6 ;; Maintainer: FSF
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; This really has nothing to do with list-command-history per se, but
  28 ;; its a nice alternative to C-x ESC ESC (repeat-complex-command) and
  29 ;; functions as a lister if given no pattern.  It's not important
  30 ;; enough to warrant a file of its own.
  31
  32 ;;; Code:
  33
  34 (defgroup chistory nil
  35   "List command history."
  36   :group 'keyboard)
  37
  38 ;;;###autoload
  39 (defun repeat-matching-complex-command (&optional pattern)
  40   "Edit and re-evaluate complex command with name matching PATTERN.
  41 Matching occurrences are displayed, most recent first, until you select
  42 a form for evaluation.  If PATTERN is empty (or nil), every form in the
  43 command history is offered.  The form is placed in the minibuffer for
  44 editing and the result is evaluated."
  45   (interactive "sRedo Command (regexp): ")
  46   (if pattern
  47       (if (string-match "[^ \t]" pattern)
  48           (setq pattern (substring pattern (match-beginning 0)))
  49         (setq pattern nil)))
  50   (let ((history command-history)
  51         (temp)
  52         (what))
  53     (while (and history (not what))
  54       (setq temp (car history))
  55       (if (and (or (not pattern) (string-match pattern (symbol-name (car temp))))
  56                (y-or-n-p (format "Redo %S? " temp)))
  57           (setq what (car history))
  58         (setq history (cdr history))))
  59     (if (not what)
  60         (error "Command history exhausted")
  61       ;; Try to remove any useless command history element for this command.
  62       (if (eq (car (car command-history)) 'repeat-matching-complex-command)
  63           (setq command-history (cdr command-history)))
  64       (edit-and-eval-command "Redo: " what))))
  65
  66 (defcustom default-command-history-filter-garbage
  67   '(command-history-mode
  68     list-command-history
  69     electric-command-history)
  70   "*A list of symbols to be ignored by `default-command-history-filter'.
  71 If that function is given a list whose car is an element of this list,
  72 then it will return non-nil (indicating the list should be discarded from
  73 the history).
  74 Initially, all commands related to the command history are discarded."
  75   :type '(repeat symbol)
  76   :group 'chistory)
  77
  78 (defvar list-command-history-filter 'default-command-history-filter
  79   "Predicate to test which commands should be excluded from the history listing.
  80 If non-nil, should be the name of a function of one argument.
  81 It is passed each element of the command history when
  82 \\[list-command-history] is called.  If the filter returns non-nil for
  83 some element, that element is excluded from the history listing.  The
  84 default filter removes commands associated with the command-history.")
  85
  86 (defun default-command-history-filter (frob)
  87   "Filter commands matching `default-command-history-filter-garbage' list
  88 from the command history."
  89   (or (not (consp frob))
  90       (memq (car frob) default-command-history-filter-garbage)))
  91
  92 (defcustom list-command-history-max 32
  93   "*If non-nil, maximum length of the listing produced by `list-command-history'."
  94   :type '(choice integer (const nil))
  95   :group 'chistory)
  96
  97 ;;;###autoload
  98 (defun list-command-history ()
  99   "List history of commands typed to minibuffer.
 100 The number of commands listed is controlled by `list-command-history-max'.
 101 Calls value of `list-command-history-filter' (if non-nil) on each history
 102 element to judge if that element should be excluded from the list.
 103
 104 The buffer is left in Command History mode."
 105   (interactive)
 106   (with-output-to-temp-buffer
 107       "*Command History*"
 108     (let ((history command-history)
 109           (buffer-read-only nil)
 110           (count (or list-command-history-max -1)))
 111       (while (and (/= count 0) history)
 112         (if (and (boundp 'list-command-history-filter)
 113                  list-command-history-filter
 114                  (funcall list-command-history-filter (car history)))
 115             nil
 116           (setq count (1- count))
 117           (prin1 (car history))
 118           (terpri))
 119         (setq history (cdr history))))
 120     (save-excursion
 121       (set-buffer "*Command History*")
 122       (goto-char (point-min))
 123       (if (eobp)
 124           (error "No command history")
 125         (command-history-mode)))))
 126
 127 (defun command-history-mode ()
 128   "Major mode for listing and repeating recent commands."
 129   (Command-history-setup)
 130   (setq major-mode 'command-history-mode)
 131   (setq mode-name "Command History")
 132   (use-local-map command-history-map)
 133   (run-hooks 'command-history-mode-hook))
 134
 135 (defun Command-history-setup ()
 136   (kill-all-local-variables)
 137   (use-local-map (or keymap command-history-map))
 138   (lisp-mode-variables nil)
 139   (set-syntax-table emacs-lisp-mode-syntax-table)
 140   (setq buffer-read-only t))
 141
 142 (defcustom command-history-hook nil
 143   "If non-nil, its value is called on entry to `command-history-mode'."
 144   :type 'hook
 145   :group 'chistory)
 146
 147 (defvar command-history-map nil)
 148 (unless command-history-map
 149   (setq command-history-map (make-sparse-keymap))
 150   (set-keymap-parent command-history-map lisp-mode-shared-map)
 151   (suppress-keymap command-history-map)
 152   (define-key command-history-map "x" 'command-history-repeat)
 153   (define-key command-history-map "\n" 'next-line)
 154   (define-key command-history-map "\r" 'next-line)
 155   (define-key command-history-map "\177" 'previous-line))
 156
 157 (defun command-history-repeat ()
 158   "Repeat the command shown on the current line.
 159 The buffer for that command is the previous current buffer."
 160   (interactive)
 161   (save-excursion
 162     (eval (prog1
 163               (save-excursion
 164                 (beginning-of-line)
 165                 (read (current-buffer)))
 166             (set-buffer
 167              (car (cdr (buffer-list))))))))
 168
 169 ;;;###autoload
 170 (defun command-history ()
 171   "Examine commands from `command-history' in a buffer.
 172 The number of commands listed is controlled by `list-command-history-max'.
 173 The command history is filtered by `list-command-history-filter' if non-nil.
 174 Use \\<command-history-map>\\[command-history-repeat] to repeat the command on the current line.
 175
 176 Otherwise much like Emacs-Lisp Mode except that there is no self-insertion
 177 and digits provide prefix arguments.  Tab does not indent.
 178 \\{command-history-map}
 179
 180 This command always recompiles the Command History listing
 181 and runs the normal hook `command-history-hook'."
 182   (interactive)
 183   (list-command-history)
 184   (pop-to-buffer "*Command History*")
 185   (run-hooks 'command-history-hook))
 186
 187 (provide 'chistory)
 188
 189 ;;; chistory.el ends here