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Annotation of 43BSD/contrib/emacs/lisp/chistory.el, revision 1.1

1.1     ! root        1: ;; chistory -- List command history
        !             2: ;; Copyright (C) 1985 Richard M. Stallman and K. Shane Hartman
        !             3: 
        !             4: ;; This file is part of GNU Emacs.
        !             5: 
        !             6: ;; GNU Emacs is distributed in the hope that it will be useful,
        !             7: ;; but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: ;; accepts responsibility to anyone for the consequences of using it
        !             9: ;; or for whether it serves any particular purpose or works at all,
        !            10: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
        !            11: ;; License for full details.
        !            12: 
        !            13: ;; Everyone is granted permission to copy, modify and redistribute
        !            14: ;; GNU Emacs, but only under the conditions described in the
        !            15: ;; GNU Emacs General Public License.   A copy of this license is
        !            16: ;; supposed to have been given to you along with GNU Emacs so you
        !            17: ;; can know your rights and responsibilities.  It should be in a
        !            18: ;; file named COPYING.  Among other things, the copyright notice
        !            19: ;; and this notice must be preserved on all copies.
        !            20: 
        !            21: 
        !            22: (provide 'chistory)
        !            23: 
        !            24: ;; This really has nothing to do with list-command-history per se, but
        !            25: ;; its a nice alternative to C-x ESC (repeat-complex-command) and
        !            26: ;; functions as a lister if given no pattern.  It's not important
        !            27: ;; enough to warrant a file of its own.
        !            28: 
        !            29: (defun repeat-matching-complex-command (&optional pattern)
        !            30:   "Edit and re-evaluate complex command with name matching PATTERN.
        !            31: Matching occurrences are displayed, most recent first, until you
        !            32: select a form for evaluation.  If PATTERN is empty (or nil), every form
        !            33: in the command history is offered.  The form is placed in the minibuffer
        !            34: for editing and the result is evaluated."
        !            35:   (interactive "sRedo Command (regexp): ")
        !            36:   (if pattern
        !            37:       (if (equal (setq pattern
        !            38:                       (substring pattern
        !            39:                                  (or (string-match "[ \t]*[^ \t]" pattern)
        !            40:                                      (length pattern))))
        !            41:                 "")
        !            42:          (setq pattern nil)))
        !            43:   (let ((history command-history)
        !            44:        (temp)
        !            45:        (what))
        !            46:     (while (and history (not what))
        !            47:       (setq temp (car history))
        !            48:       (if (and (or (not pattern) (string-match pattern (symbol-name (car temp))))
        !            49:               (y-or-n-p (format "Redo %s? " (setq temp (prin1-to-string temp)))))
        !            50:          (setq what (car history))
        !            51:        (setq history (cdr history))))
        !            52:     (if (not what)
        !            53:        (error "Command history exhausted.")
        !            54:       (edit-and-eval-command "Redo: " what))))
        !            55: 
        !            56: (defvar default-command-history-filter-garbage
        !            57:   '(command-history-mode
        !            58:     list-command-history
        !            59:     electric-command-history)
        !            60:   "*A list of symbols.  If  default-list-command-history-filter  is
        !            61: given a list whose car is an element of this list, then it will return
        !            62: non-nil (indicating the list should be discarded from the history).
        !            63: Initially, all commands related to the command history are discarded.")
        !            64: 
        !            65: (defvar list-command-history-filter 'default-command-history-filter
        !            66:   "If non-nil, should be the name of a function of one argument.
        !            67: It is passed each element of the command history when
        !            68: \\[list-command-history] is called.  If the filter returns non-nil for
        !            69: some element, that element is excluded from the history listing.  The
        !            70: default filter removes commands associated with the command-history.")
        !            71: 
        !            72: (defun default-command-history-filter (frob)
        !            73:   "Filter commands matching  default-command-history-filter-garbage  list
        !            74: from the command history."
        !            75:   (or (not (consp frob))
        !            76:       (memq (car frob) default-command-history-filter-garbage)))
        !            77: 
        !            78: (defvar list-command-history-max 32
        !            79:   "*If non-nil, should be a positive number which specifies the maximum
        !            80: length of the Command History listing produced by list-command-history.")
        !            81: 
        !            82: (defun list-command-history ()
        !            83:   "List history of commands typed to minibuffer.
        !            84: The number of commands listed is controlled by  list-command-history-max.
        !            85: Calls value of  list-command-history-filter  (if non-nil) on each history
        !            86: element to judge if that element should be excluded from the list.
        !            87: 
        !            88: The buffer is left in Command History mode."
        !            89:   (interactive)
        !            90:   (with-output-to-temp-buffer
        !            91:       "*Command History*"
        !            92:     (let ((history command-history)
        !            93:          (buffer-read-only nil)
        !            94:          (count (or list-command-history-max -1)))
        !            95:       (while (and (/= count 0) history)
        !            96:        (if (and (boundp 'list-command-history-filter)
        !            97:                 list-command-history-filter
        !            98:                 (funcall list-command-history-filter (car history)))
        !            99:            nil
        !           100:          (setq count (1- count))
        !           101:          (prin1 (car history))
        !           102:          (terpri))
        !           103:        (setq history (cdr history))))
        !           104:     (goto-char (point-min))
        !           105:     (if (eobp)
        !           106:        (error "No command history.")
        !           107:       (Command-history-setup))))
        !           108: 
        !           109: (defun Command-history-setup (&optional majormode modename keymap)
        !           110:   (set-buffer "*Command History*")
        !           111:   (use-local-map (or keymap command-history-map))
        !           112:   (lisp-mode-variables)
        !           113:   (set-syntax-table lisp-mode-syntax-table)
        !           114:   (setq buffer-read-only t)
        !           115:   (use-local-map (or keymap command-history-map))
        !           116:   (setq major-mode (or majormode 'command-history-mode))
        !           117:   (setq mode-name (or modename "Command History")))
        !           118: 
        !           119: (defvar command-history-hook nil
        !           120:   "If non-nil, its value is called on entry to  command-history-mode.")
        !           121: 
        !           122: (defvar command-history-map nil)
        !           123: (if command-history-map
        !           124:     nil
        !           125:   (setq command-history-map (make-keymap))
        !           126:   (lisp-mode-commands command-history-map)
        !           127:   (suppress-keymap command-history-map)
        !           128:   (define-key command-history-map "\n" 'next-line)
        !           129:   (define-key command-history-map "\r" 'next-line)
        !           130:   (define-key command-history-map "\177" 'previous-line))
        !           131: 
        !           132: (defun command-history-mode ()
        !           133:   "Major mode for examining commands from  command-history.
        !           134: The number of commands listed is controlled by  list-command-history-max.
        !           135: The command history is filtered by  list-command-history-filter  if non-nil.
        !           136: 
        !           137: Like Emacs-Lisp Mode except that characters do not insert themselves and
        !           138: Digits provide prefix arguments.  Tab does not indent.
        !           139: \\{command-history-map}
        !           140: Calls the value of  command-history-hook  if that is non-nil
        !           141: The Command History listing is recomputed each time this mode is
        !           142: invoked."
        !           143:   (interactive)
        !           144:   (list-command-history)
        !           145:   (pop-to-buffer "*Command History*")
        !           146:   (run-hooks 'command-history-hook))
        !           147: 
        !           148: 
        !           149:       

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