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+;; chistory -- List command history
+;; 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.
+
+
+(provide 'chistory)
+
+;; This really has nothing to do with list-command-history per se, but
+;; its a nice alternative to C-x ESC (repeat-complex-command) and
+;; functions as a lister if given no pattern.  It's not important
+;; enough to warrant a file of its own.
+
+;;;###autoload
+(defun repeat-matching-complex-command (&optional pattern)
+  "Edit and re-evaluate complex command with name matching PATTERN.
+Matching occurrences are displayed, most recent first, until you select
+a form for evaluation.  If PATTERN is empty (or nil), every form in the
+command history is offered.  The form is placed in the minibuffer for
+editing and the result is evaluated."
+  (interactive "sRedo Command (regexp): ")
+  (if pattern
+      (if (equal (setq pattern
+		       (substring pattern
+				  (or (string-match "[ \t]*[^ \t]" pattern)
+				      (length pattern))))
+		 "")
+	  (setq pattern nil)))
+  (let ((history command-history)
+	(temp)
+	(what))
+    (while (and history (not what))
+      (setq temp (car history))
+      (if (and (or (not pattern) (string-match pattern (symbol-name (car temp))))
+	       (y-or-n-p (format "Redo %s? " (setq temp (prin1-to-string temp)))))
+	  (setq what (car history))
+	(setq history (cdr history))))
+    (if (not what)
+	(error "Command history exhausted")
+      ;; Try to remove any useless command history element for this command.
+      (if (eq (car (car command-history)) 'repeat-matching-complex-command)
+	  (setq command-history (cdr command-history)))
+      (edit-and-eval-command "Redo: " what))))
+
+(defvar default-command-history-filter-garbage
+  '(command-history-mode
+    list-command-history
+    electric-command-history)
+  "*A list of symbols.  If `default-list-command-history-filter' is
+given a list whose car is an element of this list, then it will return
+non-nil (indicating the list should be discarded from the history).
+Initially, all commands related to the command history are discarded.")
+
+(defvar list-command-history-filter 'default-command-history-filter
+  "If non-nil, should be the name of a function of one argument.
+It is passed each element of the command history when
+\\[list-command-history] is called.  If the filter returns non-nil for
+some element, that element is excluded from the history listing.  The
+default filter removes commands associated with the command-history.")
+
+(defun default-command-history-filter (frob)
+  "Filter commands matching `default-command-history-filter-garbage' list
+from the command history."
+  (or (not (consp frob))
+      (memq (car frob) default-command-history-filter-garbage)))
+
+(defvar list-command-history-max 32
+  "*If non-nil, should be a positive number which specifies the maximum
+length of the Command History listing produced by `list-command-history'.")
+
+;;;###autoload
+(defun list-command-history ()
+  "List history of commands typed to minibuffer.
+The number of commands listed is controlled by `list-command-history-max'.
+Calls value of `list-command-history-filter' (if non-nil) on each history
+element to judge if that element should be excluded from the list.
+
+The buffer is left in Command History mode."
+  (interactive)
+  (with-output-to-temp-buffer
+      "*Command History*"
+    (let ((history command-history)
+	  (buffer-read-only nil)
+	  (count (or list-command-history-max -1)))
+      (while (and (/= count 0) history)
+	(if (and (boundp 'list-command-history-filter)
+		 list-command-history-filter
+		 (funcall list-command-history-filter (car history)))
+	    nil
+	  (setq count (1- count))
+	  (prin1 (car history))
+	  (terpri))
+	(setq history (cdr history))))
+    (save-excursion
+      (set-buffer "*Command History*")
+      (goto-char (point-min))
+      (if (eobp)
+	  (error "No command history")
+	(Command-history-setup)))))
+
+(defun Command-history-setup (&optional majormode modename keymap)
+  (set-buffer "*Command History*")
+  (use-local-map (or keymap command-history-map))
+  (lisp-mode-variables nil)
+  (set-syntax-table emacs-lisp-mode-syntax-table)
+  (setq buffer-read-only t)
+  (use-local-map (or keymap command-history-map))
+  (setq major-mode (or majormode 'command-history-mode))
+  (setq mode-name (or modename "Command History")))
+
+(defvar command-history-hook nil
+  "If non-nil, its value is called on entry to `command-history-mode'.")
+
+(defvar command-history-map nil)
+(if command-history-map
+    nil
+  (setq command-history-map
+	(nconc (make-sparse-keymap) shared-lisp-mode-map))
+  (suppress-keymap command-history-map)
+  (define-key command-history-map "x" 'command-history-repeat)
+  (define-key command-history-map "\n" 'next-line)
+  (define-key command-history-map "\r" 'next-line)
+  (define-key command-history-map "\177" 'previous-line))
+
+(defun command-history-repeat ()
+  "Repeat the command shown on the current line.
+The buffer for that command is the previous current buffer."
+  (interactive)
+  (save-excursion
+    (eval (prog1
+	      (save-excursion
+		(beginning-of-line)
+		(read (current-buffer)))
+	    (set-buffer
+	     (cdr (buffer-list)))))))
+
+;;;###autoload
+(defun command-history-mode ()
+  "Major mode for examining commands from `command-history'.
+The number of commands listed is controlled by `list-command-history-max'.
+The command history is filtered by `list-command-history-filter' if non-nil.
+Use \\<command-history-map>\\[command-history-repeat] to repeat the command on the current line.
+
+Otherwise much like Emacs-Lisp Mode except that there is no self-insertion
+and digits provide prefix arguments.  Tab does not indent.
+\\{command-history-map}
+Calls the value of `command-history-hook' if that is non-nil.
+The Command History listing is recomputed each time this mode is invoked."
+  (interactive)
+  (list-command-history)
+  (pop-to-buffer "*Command History*")
+  (run-hooks 'command-history-hook))