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

1.1     ! root        1: ;; Page motion commands for emacs.
        !             2: ;; Copyright (C) 1985 Richard M. Stallman.
        !             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: (defun forward-page (&optional count)
        !            23:   "Move forward to page boundary.  With arg, repeat, or go back if negative.
        !            24: A page boundary is any line whose beginning matches the regexp  page-delimiter."
        !            25:   (interactive "p")
        !            26:   (or count (setq count 1))
        !            27:   (while (and (> count 0) (not (eobp)))
        !            28:     (if (re-search-forward page-delimiter nil t)
        !            29:        nil
        !            30:       (goto-char (point-max)))
        !            31:     (setq count (1- count)))
        !            32:   (while (and (< count 0) (not (bobp)))
        !            33:     (forward-char -1)
        !            34:     (if (re-search-backward page-delimiter nil t)
        !            35:        (goto-char (match-end 0))
        !            36:       (goto-char (point-min)))
        !            37:     (setq count (1+ count))))
        !            38: 
        !            39: (defun backward-page (&optional count)
        !            40:   "Move backward to page boundary.  With arg, repeat, or go fwd if negative.
        !            41: A page boundary is any line whose beginning matches the regexp  page-delimiter."
        !            42:   (interactive "p")
        !            43:   (or count (setq count 1))
        !            44:   (forward-page (- count)))
        !            45: 
        !            46: (defun mark-page (&optional arg)
        !            47:   "Put mark at end of page, point at beginning.
        !            48: A numeric arg specifies to move forward or backward by that many pages,
        !            49: thus marking a page other than the one point was originally in."
        !            50:   (interactive "P")
        !            51:   (setq arg (if arg (prefix-numeric-value arg) 0))
        !            52:   (if (> arg 0)
        !            53:       (forward-page arg)
        !            54:     (if (< arg 0)
        !            55:         (forward-page (1- arg))))
        !            56:   (forward-page)
        !            57:   (set-mark (point))
        !            58:   (forward-page -1))
        !            59: 
        !            60: (defun narrow-to-page (&optional arg)
        !            61:   "Make text outside current page invisible.
        !            62: A numeric arg specifies to move forward or backward by that many pages,
        !            63: thus showing a page other than the one point was originally in."
        !            64:   (interactive "P")
        !            65:   (setq arg (if arg (prefix-numeric-value arg) 0))
        !            66:   (save-excursion
        !            67:    (if (> arg 0)
        !            68:        (forward-page arg)
        !            69:      (if (< arg 0)
        !            70:         (forward-page (1- arg))))
        !            71:    (forward-page)
        !            72:    (beginning-of-line)
        !            73:    (narrow-to-region (point)
        !            74:                     (progn
        !            75:                      (forward-page -1)
        !            76:                      (point)))))
        !            77: 
        !            78: (defun count-lines-page ()
        !            79:   "Report number of lines on current page, and how many are before or after point."
        !            80:   (interactive)
        !            81:   (save-excursion
        !            82:     (let ((opoint (point)) beg end
        !            83:          total before after)
        !            84:       (forward-page)
        !            85:       (beginning-of-line)
        !            86:       (setq end (point))
        !            87:       (backward-page)
        !            88:       (setq beg (point))
        !            89:       (setq total (count-lines beg end)
        !            90:            before (count-lines beg opoint)
        !            91:            after (count-lines opoint end))
        !            92:       (message "Page has %d lines (%d + %d)" total before after))))
        !            93: 
        !            94: (defun what-page ()
        !            95:   "Print page and line number of point."
        !            96:   (interactive)
        !            97:   (let ((count 1) opoint)
        !            98:     (save-restriction
        !            99:       (widen)
        !           100:       (save-excursion
        !           101:        (beginning-of-line)
        !           102:        (setq opoint (point))
        !           103:        (goto-char 1)
        !           104:        (while (re-search-forward page-delimiter opoint t)
        !           105:          (setq count (1+ count)))
        !           106:        (message "Page %d, line %d" count (1+ (count-lines (point) opoint)))))))

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