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+;; Electric Command History Mode
+;; Copyright (C) 1985 Free Software Foundation, Inc.
+;; Principal author K. Shane Hartman
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+(require 'electric)                     ; command loop
+(require 'chistory)                     ; history lister
+
+(defun Electric-command-history-redo-expression (&optional noconfirm)
+  "Edit current history line in minibuffer and execute result.
+With prefix arg NOCONFIRM, execute current line as-is without editing."
+  (interactive "P")
+  (let (todo)
+    (save-excursion
+      (set-buffer "*Command History*")
+      (beginning-of-line)
+      (setq todo (read (current-buffer)))
+      (if (boundp 'electric-history-in-progress)
+          (if todo (throw 'electric-history-quit (list noconfirm todo)))))))
+
+(defvar electric-history-map ())
+(if electric-history-map
+    ()
+  (setq electric-history-map (make-keymap))
+  (fillarray electric-history-map 'Electric-history-undefined)
+  (define-key electric-history-map "\e" (make-keymap))
+  (fillarray (lookup-key electric-history-map "\e") 'Electric-history-undefined)
+  (define-key electric-history-map "\C-u" 'universal-argument)
+  (define-key electric-history-map " " 'Electric-command-history-redo-expression)
+  (define-key electric-history-map "!" 'Electric-command-history-redo-expression)
+  (define-key electric-history-map "\e\C-x" 'eval-sexp)
+  (define-key electric-history-map "\e\C-d" 'down-list)
+  (define-key electric-history-map "\e\C-u" 'backward-up-list)
+  (define-key electric-history-map "\e\C-b" 'backward-sexp)
+  (define-key electric-history-map "\e\C-f" 'forward-sexp)
+  (define-key electric-history-map "\e\C-a" 'beginning-of-defun)
+  (define-key electric-history-map "\e\C-e" 'end-of-defun)
+  (define-key electric-history-map "\e\C-n" 'forward-list)
+  (define-key electric-history-map "\e\C-p" 'backward-list)
+  (define-key electric-history-map "q" 'Electric-history-quit)
+  (define-key electric-history-map "\C-c" nil)
+  (define-key electric-history-map "\C-c\C-c" 'Electric-history-quit)
+  (define-key electric-history-map "\C-]" 'Electric-history-quit)
+  (define-key electric-history-map "\C-z" 'suspend-emacs)
+  (define-key electric-history-map "\C-h" 'Helper-help)
+  (define-key electric-history-map "?" 'Helper-describe-bindings)
+  (define-key electric-history-map "\e>" 'end-of-buffer)
+  (define-key electric-history-map "\e<" 'beginning-of-buffer)
+  (define-key electric-history-map "\n" 'next-line)
+  (define-key electric-history-map "\r" 'next-line)
+  (define-key electric-history-map "\177" 'previous-line)  
+  (define-key electric-history-map "\C-n" 'next-line)
+  (define-key electric-history-map "\C-p" 'previous-line)
+  (define-key electric-history-map "\ev" 'scroll-down)
+  (define-key electric-history-map "\C-v" 'scroll-up)
+  (define-key electric-history-map "\C-l" 'recenter)
+  (define-key electric-history-map "\e\C-v" 'scroll-other-window))
+
+(defvar electric-command-history-hook nil
+  "If non-nil, its value is called by `electric-command-history'.")
+
+(defun electric-command-history ()
+  "\\<electric-history-map>Major mode for examining and redoing commands from `command-history'.
+This pops up a window with the Command History listing.
+The number of command listed is controlled by `list-command-history-max'.
+The command history is filtered by `list-command-history-filter' if non-nil.
+Combines typeout Command History list window with menu like selection
+of an expression from the history for re-evaluation in the *original* buffer.
+
+The history displayed is filtered by `list-command-history-filter' if non-nil.
+
+Like Emacs-Lisp mode except that characters do not insert themselves and
+Tab and Linefeed do not indent.  Instead these commands are provided:
+\\{electric-history-map}
+
+Calls the value of `electric-command-history-hook' if that is non-nil.
+The Command History listing is recomputed each time this mode is invoked."
+  (interactive)
+  (let ((electric-history-in-progress t)
+        (old-buffer (current-buffer))
+        (todo))
+    (unwind-protect
+        (setq todo
+              (catch 'electric-history-quit
+                (save-window-excursion
+                  (save-window-excursion
+                    (list-command-history)
+                    (set-buffer "*Command History*")
+                    (Command-history-setup 'electric-command-history
+                                           "Electric History"
+                                           electric-history-map))
+                  (Electric-pop-up-window "*Command History*")
+                  (run-hooks 'electric-command-history-hook)
+                  (if (eobp)
+                      (progn (ding)
+                             (message "No command history.")
+                             (throw 'electric-history-quit nil))
+                    (let ((Helper-return-blurb "return to History"))
+                      (Electric-command-loop 'electric-history-quit
+                                             "->" t))))))
+      (set-buffer "*Command History*")
+      (Command-history-setup)
+      (bury-buffer (current-buffer)))
+    (if (consp todo)
+        (progn (set-buffer old-buffer)
+               (if (car todo)
+                   (apply (car (car (cdr todo))) (cdr (car (cdr todo))))
+                 (edit-and-eval-command "Redo: " (car (cdr todo))))))))
+
+(defun Electric-history-undefined ()
+  (interactive)
+  (ding)
+  (message "Type C-h for help, ? for commands, C-c to quit, Space to execute")
+  (sit-for 4))
+
+(defun Electric-history-quit ()
+  "Quit Electric Command History, restoring previous window configuration."
+  (interactive)
+  (if (boundp 'electric-history-in-progress)
+      (progn (message "")
+             (throw 'electric-history-quit nil))))