Fix a cacheing bug, which led to inordinately slow c-beginning-of-defun.
[emacs.git] / lisp / chistory.el
blob6f8a74b2a67bb8cee3b659dd21835014ba3847c3
1 ;;; chistory.el --- list command history
3 ;; Copyright (C) 1985, 2001-2016 Free Software Foundation, Inc.
5 ;; Author: K. Shane Hartman
6 ;; Maintainer: emacs-devel@gnu.org
7 ;; Keywords: convenience
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
24 ;;; Commentary:
26 ;; This really has nothing to do with list-command-history per se, but
27 ;; its a nice alternative to C-x ESC ESC (repeat-complex-command) and
28 ;; functions as a lister if given no pattern. It's not important
29 ;; enough to warrant a file of its own.
31 ;;; Code:
33 (defgroup chistory nil
34 "List command history."
35 :group 'keyboard)
37 ;;;###autoload
38 (defun repeat-matching-complex-command (&optional pattern)
39 "Edit and re-evaluate complex command with name matching PATTERN.
40 Matching occurrences are displayed, most recent first, until you select
41 a form for evaluation. If PATTERN is empty (or nil), every form in the
42 command history is offered. The form is placed in the minibuffer for
43 editing and the result is evaluated."
44 (interactive "sRedo Command (regexp): ")
45 (if pattern
46 (if (string-match "[^ \t]" pattern)
47 (setq pattern (substring pattern (match-beginning 0)))
48 (setq pattern nil)))
49 (let ((history command-history)
50 (temp)
51 (what))
52 (while (and history (not what))
53 (setq temp (car history))
54 (if (and (or (not pattern) (string-match pattern (symbol-name (car temp))))
55 (y-or-n-p (format "Redo %S? " temp)))
56 (setq what (car history))
57 (setq history (cdr history))))
58 (if (not what)
59 (error "Command history exhausted")
60 ;; Try to remove any useless command history element for this command.
61 (if (eq (car (car command-history)) 'repeat-matching-complex-command)
62 (setq command-history (cdr command-history)))
63 (edit-and-eval-command "Redo: " what))))
65 (defcustom default-command-history-filter-garbage
66 '(command-history-mode
67 list-command-history
68 electric-command-history)
69 "A list of symbols to be ignored by `default-command-history-filter'.
70 If that function is given a list whose car is an element of this list,
71 then it will return non-nil (indicating the list should be discarded from
72 the history).
73 Initially, all commands related to the command history are discarded."
74 :type '(repeat symbol)
75 :group 'chistory)
77 (defvar list-command-history-filter 'default-command-history-filter
78 "Predicate to test which commands should be excluded from the history listing.
79 If non-nil, should be the name of a function of one argument.
80 It is passed each element of the command history when
81 \\[list-command-history] is called. If the filter returns non-nil for
82 some element, that element is excluded from the history listing. The
83 default filter removes commands associated with the command-history.")
85 (defun default-command-history-filter (frob)
86 "Filter commands matching `default-command-history-filter-garbage' list
87 from the command history."
88 (or (not (consp frob))
89 (memq (car frob) default-command-history-filter-garbage)))
91 (defcustom list-command-history-max 32
92 "If non-nil, maximum length of the listing produced by `list-command-history'."
93 :type '(choice integer (const nil))
94 :group 'chistory)
96 ;;;###autoload
97 (defun list-command-history ()
98 "List history of commands typed to minibuffer.
99 The number of commands listed is controlled by `list-command-history-max'.
100 Calls value of `list-command-history-filter' (if non-nil) on each history
101 element to judge if that element should be excluded from the list.
103 The buffer is left in Command History mode."
104 (interactive)
105 (with-output-to-temp-buffer
106 "*Command History*"
107 (let ((history command-history)
108 (buffer-read-only nil)
109 (count (or list-command-history-max -1)))
110 (while (and (/= count 0) history)
111 (if (and (bound-and-true-p list-command-history-filter)
112 (funcall list-command-history-filter (car history)))
114 (setq count (1- count))
115 (prin1 (car history))
116 (terpri))
117 (setq history (cdr history))))
118 (with-current-buffer "*Command History*"
119 (goto-char (point-min))
120 (if (eobp)
121 (error "No command history")
122 (command-history-mode)))))
124 (define-obsolete-variable-alias 'command-history-map
125 'command-history-mode-map "24.1")
126 (defvar command-history-mode-map
127 (let ((map (make-sparse-keymap)))
128 (set-keymap-parent map lisp-mode-shared-map)
129 (suppress-keymap map)
130 (define-key map "x" 'command-history-repeat)
131 (define-key map "\n" 'next-line)
132 (define-key map "\r" 'next-line)
133 (define-key map "\177" 'previous-line)
134 map)
135 "Keymap for `command-history-mode'.")
137 (define-derived-mode command-history-mode fundamental-mode "Command History"
138 "Major mode for listing and repeating recent commands.
140 Keybindings:
141 \\{command-history-mode-map}"
142 (lisp-mode-variables nil)
143 (set-syntax-table emacs-lisp-mode-syntax-table)
144 (setq buffer-read-only t))
146 (defcustom command-history-hook nil
147 "If non-nil, its value is called on entry to `command-history-mode'."
148 :type 'hook
149 :group 'chistory)
151 (defun command-history-repeat ()
152 "Repeat the command shown on the current line.
153 The buffer for that command is the previous current buffer."
154 (interactive)
155 (save-excursion
156 (eval (prog1
157 (save-excursion
158 (beginning-of-line)
159 (read (current-buffer)))
160 (set-buffer
161 (car (cdr (buffer-list))))))))
163 ;;;###autoload
164 (defun command-history ()
165 "Examine commands from `command-history' in a buffer.
166 The number of commands listed is controlled by `list-command-history-max'.
167 The command history is filtered by `list-command-history-filter' if non-nil.
168 Use \\<command-history-map>\\[command-history-repeat] to repeat the command on the current line.
170 Otherwise much like Emacs-Lisp Mode except that there is no self-insertion
171 and digits provide prefix arguments. Tab does not indent.
172 \\{command-history-map}
174 This command always recompiles the Command History listing
175 and runs the normal hook `command-history-hook'."
176 (interactive)
177 (list-command-history)
178 (pop-to-buffer "*Command History*")
179 (run-hooks 'command-history-hook))
181 (provide 'chistory)
183 ;;; chistory.el ends here