lisp/echistory.el

   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.
  36 With 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'.
  94 This pops up a window with the Command History listing.
  95 The number of command listed is controlled by `list-command-history-max'.
  96 The command history is filtered by `list-command-history-filter' if non-nil.
  97 Combines typeout Command History list window with menu like selection
  98 of an expression from the history for re-evaluation in the *original* buffer.
  99
 100 The history displayed is filtered by `list-command-history-filter' if non-nil.
 101
 102 Like Emacs-Lisp mode except that characters do not insert themselves and
 103 Tab and Linefeed do not indent.  Instead these commands are provided:
 104 \\{electric-history-map}
 105
 106 Calls the value of `electric-command-history-hook' if that is non-nil.
 107 The 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