1;;; echistory.el --- Electric Command History Mode
2
3;; Copyright (C) 1985, 2001, 2002, 2003, 2004, 2005,
4;;   2006, 2007 Free Software Foundation, Inc.
5
6;; Author: K. Shane Hartman
7;; Maintainer: FSF
8
9;; This file is part of GNU Emacs.
10
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 2, or (at your option)
14;; any later version.
15
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.
20
21;; You should have received a copy of the GNU General Public License
22;; along with GNU Emacs; see the file COPYING.  If not, write to the
23;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24;; Boston, MA 02110-1301, USA.
25
26;;; Commentary:
27
28;;; Code:
29
30(require 'electric)			; command loop
31(require 'chistory)			; history lister
32
33;;;###autoload
34(defun Electric-command-history-redo-expression (&optional noconfirm)
35  "Edit current history line in minibuffer and execute result.
36With prefix arg NOCONFIRM, execute current line as-is without editing."
37  (interactive "P")
38  (let (todo)
39    (save-excursion
40      (set-buffer "*Command History*")
41      (beginning-of-line)
42      (setq todo (read (current-buffer)))
43      (if (boundp 'electric-history-in-progress)
44	  (if todo (throw 'electric-history-quit (list noconfirm todo)))))))
45
46(defvar electric-history-map ())
47(if electric-history-map
48    ()
49  (setq electric-history-map (make-sparse-keymap))
50  (define-key electric-history-map [t] 'Electric-history-undefined)
51  (define-key electric-history-map "\e" (make-sparse-keymap))
52  (define-key electric-history-map [?\e t] 'Electric-history-undefined)
53  (define-key electric-history-map "\C-u" 'universal-argument)
54  (define-key electric-history-map " " 'Electric-command-history-redo-expression)
55  (define-key electric-history-map "!" 'Electric-command-history-redo-expression)
56  (define-key electric-history-map "\e\C-x" 'eval-sexp)
57  (define-key electric-history-map "\e\C-d" 'down-list)
58  (define-key electric-history-map "\e\C-u" 'backward-up-list)
59  (define-key electric-history-map "\e\C-b" 'backward-sexp)
60  (define-key electric-history-map "\e\C-f" 'forward-sexp)
61  (define-key electric-history-map "\e\C-a" 'beginning-of-defun)
62  (define-key electric-history-map "\e\C-e" 'end-of-defun)
63  (define-key electric-history-map "\e\C-n" 'forward-list)
64  (define-key electric-history-map "\e\C-p" 'backward-list)
65  (define-key electric-history-map "q" 'Electric-history-quit)
66  (define-key electric-history-map "\C-c" nil)
67  (define-key electric-history-map "\C-c\C-c" 'Electric-history-quit)
68  (define-key electric-history-map "\C-]" 'Electric-history-quit)
69  (define-key electric-history-map "\C-z" 'suspend-emacs)
70  (define-key electric-history-map (char-to-string help-char) 'Helper-help)
71  (define-key electric-history-map "?" 'Helper-describe-bindings)
72  (define-key electric-history-map "\e>" 'end-of-buffer)
73  (define-key electric-history-map "\e<" 'beginning-of-buffer)
74  (define-key electric-history-map "\n" 'next-line)
75  (define-key electric-history-map "\r" 'next-line)
76  (define-key electric-history-map "\177" 'previous-line)
77  (define-key electric-history-map "\C-n" 'next-line)
78  (define-key electric-history-map "\C-p" 'previous-line)
79  (define-key electric-history-map "\ev" 'scroll-down)
80  (define-key electric-history-map "\C-v" 'scroll-up)
81  (define-key electric-history-map [home] 'beginning-of-buffer)
82  (define-key electric-history-map [down] 'next-line)
83  (define-key electric-history-map [up] 'previous-line)
84  (define-key electric-history-map [prior] 'scroll-down)
85  (define-key electric-history-map [next] 'scroll-up)
86  (define-key electric-history-map "\C-l" 'recenter)
87  (define-key electric-history-map "\e\C-v" 'scroll-other-window))
88
89(defvar electric-command-history-hook nil
90  "If non-nil, its value is called by `electric-command-history'.")
91
92(defun electric-command-history ()
93  "\\<electric-history-map>Major mode for examining and redoing commands from `command-history'.
94This pops up a window with the Command History listing.
95The number of command listed is controlled by `list-command-history-max'.
96The command history is filtered by `list-command-history-filter' if non-nil.
97Combines typeout Command History list window with menu like selection
98of an expression from the history for re-evaluation in the *original* buffer.
99
100The history displayed is filtered by `list-command-history-filter' if non-nil.
101
102Like Emacs-Lisp mode except that characters do not insert themselves and
103Tab and Linefeed do not indent.  Instead these commands are provided:
104\\{electric-history-map}
105
106Calls the value of `electric-command-history-hook' if that is non-nil.
107The Command History listing is recomputed each time this mode is invoked."
108  (interactive)
109  (let ((electric-history-in-progress t)
110	(old-buffer (current-buffer))
111	(todo))
112    (unwind-protect
113	(setq todo
114	      (catch 'electric-history-quit
115		(save-window-excursion
116		  (save-window-excursion
117		    (list-command-history)
118		    (set-buffer "*Command History*")
119		    (Command-history-setup)
120		    (setq major-mode 'electric-command-history)
121		    (setq mode-name "Electric History")
122		    (use-local-map electric-history-map))
123		  (Electric-pop-up-window "*Command History*")
124		  (run-hooks 'electric-command-history-hook)
125		  (if (eobp)
126		      (progn (ding)
127			     (message "No command history.")
128			     (throw 'electric-history-quit nil))
129		    (let ((Helper-return-blurb "return to History"))
130		      (Electric-command-loop 'electric-history-quit
131					     "->" t))))))
132      (set-buffer "*Command History*")
133      (command-history-mode)
134      (bury-buffer (current-buffer)))
135    (if (consp todo)
136	(progn (set-buffer old-buffer)
137	       (if (car todo)
138		   (apply (car (car (cdr todo))) (cdr (car (cdr todo))))
139		 (edit-and-eval-command "Redo: " (car (cdr todo))))))))
140
141(defun Electric-history-undefined ()
142  (interactive)
143  (ding)
144  (message "%s" (substitute-command-keys "Type \\[Helper-help] for help, ? for commands, C-c C-c to quit, Space to execute"))
145  (sit-for 4))
146
147(defun Electric-history-quit ()
148  "Quit Electric Command History, restoring previous window configuration."
149  (interactive)
150  (if (boundp 'electric-history-in-progress)
151      (progn (message "")
152	     (throw 'electric-history-quit nil))))
153
154(provide 'echistory)
155
156;;; arch-tag: 1e5018fe-190f-44a7-9109-a895dcac4c50
157;;; echistory.el ends here
158