lisp/echistory.el

   1 ;;; echistory.el --- Electric Command History Mode
   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
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Code:
  25
  26 (require 'electric)                     ; command loop
  27 (require 'chistory)                     ; history lister
  28
  29 ;;;###autoload
  30 (defun Electric-command-history-redo-expression (&optional noconfirm)
  31   "Edit current history line in minibuffer and execute result.
  32 With prefix arg NOCONFIRM, execute current line as-is without editing."
  33   (interactive "P")
  34   (let (todo)
  35     (save-excursion
  36       (set-buffer "*Command History*")
  37       (beginning-of-line)
  38       (setq todo (read (current-buffer)))
  39       (if (boundp 'electric-history-in-progress)
  40           (if todo (throw 'electric-history-quit (list noconfirm todo)))))))
  41
  42 (defvar electric-history-map ())
  43 (if electric-history-map
  44     ()
  45   (setq electric-history-map (make-keymap))
  46   (fillarray electric-history-map 'Electric-history-undefined)
  47   (define-key electric-history-map "\e" (make-keymap))
  48   (fillarray (lookup-key electric-history-map "\e") 'Electric-history-undefined)
  49   (define-key electric-history-map "\C-u" 'universal-argument)
  50   (define-key electric-history-map " " 'Electric-command-history-redo-expression)
  51   (define-key electric-history-map "!" 'Electric-command-history-redo-expression)
  52   (define-key electric-history-map "\e\C-x" 'eval-sexp)
  53   (define-key electric-history-map "\e\C-d" 'down-list)
  54   (define-key electric-history-map "\e\C-u" 'backward-up-list)
  55   (define-key electric-history-map "\e\C-b" 'backward-sexp)
  56   (define-key electric-history-map "\e\C-f" 'forward-sexp)
  57   (define-key electric-history-map "\e\C-a" 'beginning-of-defun)
  58   (define-key electric-history-map "\e\C-e" 'end-of-defun)
  59   (define-key electric-history-map "\e\C-n" 'forward-list)
  60   (define-key electric-history-map "\e\C-p" 'backward-list)
  61   (define-key electric-history-map "q" 'Electric-history-quit)
  62   (define-key electric-history-map "\C-c" nil)
  63   (define-key electric-history-map "\C-c\C-c" 'Electric-history-quit)
  64   (define-key electric-history-map "\C-]" 'Electric-history-quit)
  65   (define-key electric-history-map "\C-z" 'suspend-emacs)
  66   (define-key electric-history-map "\C-h" 'Helper-help)
  67   (define-key electric-history-map "?" 'Helper-describe-bindings)
  68   (define-key electric-history-map "\e>" 'end-of-buffer)
  69   (define-key electric-history-map "\e<" 'beginning-of-buffer)
  70   (define-key electric-history-map "\n" 'next-line)
  71   (define-key electric-history-map "\r" 'next-line)
  72   (define-key electric-history-map "\177" 'previous-line)
  73   (define-key electric-history-map "\C-n" 'next-line)
  74   (define-key electric-history-map "\C-p" 'previous-line)
  75   (define-key electric-history-map "\ev" 'scroll-down)
  76   (define-key electric-history-map "\C-v" 'scroll-up)
  77   (define-key electric-history-map "\C-l" 'recenter)
  78   (define-key electric-history-map "\e\C-v" 'scroll-other-window))
  79
  80 (defvar electric-command-history-hook nil
  81   "If non-nil, its value is called by `electric-command-history'.")
  82
  83 (defun electric-command-history ()
  84   "\\<electric-history-map>Major mode for examining and redoing commands from `command-history'.
  85 This pops up a window with the Command History listing.
  86 The number of command listed is controlled by `list-command-history-max'.
  87 The command history is filtered by `list-command-history-filter' if non-nil.
  88 Combines typeout Command History list window with menu like selection
  89 of an expression from the history for re-evaluation in the *original* buffer.
  90
  91 The history displayed is filtered by `list-command-history-filter' if non-nil.
  92
  93 Like Emacs-Lisp mode except that characters do not insert themselves and
  94 Tab and Linefeed do not indent.  Instead these commands are provided:
  95 \\{electric-history-map}
  96
  97 Calls the value of `electric-command-history-hook' if that is non-nil.
  98 The Command History listing is recomputed each time this mode is invoked."
  99   (interactive)
 100   (let ((electric-history-in-progress t)
 101         (old-buffer (current-buffer))
 102         (todo))
 103     (unwind-protect
 104         (setq todo
 105               (catch 'electric-history-quit
 106                 (save-window-excursion
 107                   (save-window-excursion
 108                     (list-command-history)
 109                     (set-buffer "*Command History*")
 110                     (Command-history-setup 'electric-command-history
 111                                            "Electric History"
 112                                            electric-history-map))
 113                   (Electric-pop-up-window "*Command History*")
 114                   (run-hooks 'electric-command-history-hook)
 115                   (if (eobp)
 116                       (progn (ding)
 117                              (message "No command history.")
 118                              (throw 'electric-history-quit nil))
 119                     (let ((Helper-return-blurb "return to History"))
 120                       (Electric-command-loop 'electric-history-quit
 121                                              "->" t))))))
 122       (set-buffer "*Command History*")
 123       (Command-history-setup)
 124       (bury-buffer (current-buffer)))
 125     (if (consp todo)
 126         (progn (set-buffer old-buffer)
 127                (if (car todo)
 128                    (apply (car (car (cdr todo))) (cdr (car (cdr todo))))
 129                  (edit-and-eval-command "Redo: " (car (cdr todo))))))))
 130
 131 (defun Electric-history-undefined ()
 132   (interactive)
 133   (ding)
 134   (message "Type C-h for help, ? for commands, C-c to quit, Space to execute")
 135   (sit-for 4))
 136
 137 (defun Electric-history-quit ()
 138   "Quit Electric Command History, restoring previous window configuration."
 139   (interactive)
 140   (if (boundp 'electric-history-in-progress)
 141       (progn (message "")
 142              (throw 'electric-history-quit nil))))
 143
 144 ;;; echistory.el ends here