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+ − 1 ;;; page.el --- page motion commands for Emacs
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+ − 2
+ − 3 ;; Copyright (C) 1985, 1997 Free Software Foundation, Inc.
+ − 4
+ − 5 ;; Maintainer: FSF
+ − 6 ;; Keywords: extensions, dumped
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+ − 7 ;; Keywords: wp convenience
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+ − 8
+ − 9 ;; This file is part of XEmacs.
+ − 10
+ − 11 ;; XEmacs is free software; you can redistribute it and/or modify it
+ − 12 ;; under the terms of the GNU General Public License as published by
+ − 13 ;; the Free Software Foundation; either version 2, or (at your option)
+ − 14 ;; any later version.
+ − 15
+ − 16 ;; XEmacs is distributed in the hope that it will be useful, but
+ − 17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
+ − 18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ − 19 ;; General Public License for more details.
+ − 20
+ − 21 ;; You should have received a copy of the GNU General Public License
+ − 22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
+ − 23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ − 24 ;; 02111-1307, USA.
+ − 25
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+ − 26 ;;; Synched up with: FSF 21.3.
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+ − 27
+ − 28 ;;; Commentary:
+ − 29
+ − 30 ;; This file is dumped with XEmacs.
+ − 31
+ − 32 ;; This code provides the page-oriented movement and selection commands
+ − 33 ;; documented in the XEmacs Reference Manual.
+ − 34
+ − 35 ;;; Code:
+ − 36
+ − 37 (defun forward-page (&optional count)
+ − 38 "Move forward to page boundary. With arg, repeat, or go back if negative.
+ − 39 A page boundary is any line whose beginning matches the regexp
+ − 40 `page-delimiter'."
+ − 41 (interactive "_p") ; XEmacs
+ − 42 (or count (setq count 1))
+ − 43 (while (and (> count 0) (not (eobp)))
+ − 44 ;; In case the page-delimiter matches the null string,
+ − 45 ;; don't find a match without moving.
+ − 46 (if (bolp) (forward-char 1))
+ − 47 (if (re-search-forward page-delimiter nil t)
+ − 48 nil
+ − 49 (goto-char (point-max)))
+ − 50 (setq count (1- count)))
+ − 51 (while (and (< count 0) (not (bobp)))
+ − 52 ;; In case the page-delimiter matches the null string,
+ − 53 ;; don't find a match without moving.
+ − 54 (and (save-excursion (re-search-backward page-delimiter nil t))
+ − 55 (= (match-end 0) (point))
+ − 56 (goto-char (match-beginning 0)))
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+ − 57 (backward-char 1)
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+ − 58 (if (re-search-backward page-delimiter nil t)
+ − 59 ;; We found one--move to the end of it.
+ − 60 (goto-char (match-end 0))
+ − 61 ;; We found nothing--go to beg of buffer.
+ − 62 (goto-char (point-min)))
+ − 63 (setq count (1+ count))))
+ − 64
+ − 65 (defun backward-page (&optional count)
+ − 66 "Move backward to page boundary. With arg, repeat, or go fwd if negative.
+ − 67 A page boundary is any line whose beginning matches the regexp
+ − 68 `page-delimiter'."
+ − 69 (interactive "_p") ; XEmacs
+ − 70 (or count (setq count 1))
+ − 71 (forward-page (- count)))
+ − 72
+ − 73 (defun mark-page (&optional arg)
+ − 74 "Put mark at end of page, point at beginning.
+ − 75 A numeric arg specifies to move forward or backward by that many pages,
+ − 76 thus marking a page other than the one point was originally in."
+ − 77 (interactive "P")
+ − 78 (setq arg (if arg (prefix-numeric-value arg) 0))
+ − 79 (if (> arg 0)
+ − 80 (forward-page arg)
+ − 81 (if (< arg 0)
+ − 82 (forward-page (1- arg))))
+ − 83 (forward-page)
+ − 84 (push-mark nil t t)
+ − 85 (forward-page -1))
+ − 86
+ − 87 (defun narrow-to-page (&optional arg)
+ − 88 "Make text outside current page invisible.
+ − 89 A numeric arg specifies to move forward or backward by that many pages,
+ − 90 thus showing a page other than the one point was originally in."
+ − 91 (interactive "P")
+ − 92 (setq arg (if arg (prefix-numeric-value arg) 0))
+ − 93 (save-excursion
+ − 94 (widen)
+ − 95 (if (> arg 0)
+ − 96 (forward-page arg)
+ − 97 (if (< arg 0)
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+ − 98 (let ((adjust 0)
+ − 99 (opoint (point)))
+ − 100 ;; If we are not now at the beginning of a page,
+ − 101 ;; move back one extra time, to get to the start of this page.
+ − 102 (save-excursion
+ − 103 (beginning-of-line)
+ − 104 (or (and (looking-at page-delimiter)
+ − 105 (eq (match-end 0) opoint))
+ − 106 (setq adjust 1)))
+ − 107 (forward-page (- arg adjust)))))
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+ − 108 ;; Find the end of the page.
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+ − 109 (set-match-data nil)
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+ − 110 (forward-page)
+ − 111 ;; If we stopped due to end of buffer, stay there.
+ − 112 ;; If we stopped after a page delimiter, put end of restriction
+ − 113 ;; at the beginning of that line.
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+ − 114 ;; Before checking the match that was found,
+ − 115 ;; verify that forward-page actually set the match data.
+ − 116 (if (and (match-beginning 0)
+ − 117 (save-excursion
+ − 118 (goto-char (match-beginning 0)) ; was (beginning-of-line)
+ − 119 (looking-at page-delimiter)))
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+ − 120 (beginning-of-line))
+ − 121 (narrow-to-region (point)
+ − 122 (progn
+ − 123 ;; Find the top of the page.
+ − 124 (forward-page -1)
+ − 125 ;; If we found beginning of buffer, stay there.
+ − 126 ;; If extra text follows page delimiter on same line,
+ − 127 ;; include it.
+ − 128 ;; Otherwise, show text starting with following line.
+ − 129 (if (and (eolp) (not (bobp)))
+ − 130 (forward-line 1))
+ − 131 (point)))))
+ − 132 (put 'narrow-to-page 'disabled t)
+ − 133
+ − 134 (defun count-lines-page ()
+ − 135 "Report number of lines on current page, and how many are before or after point."
+ − 136 (interactive "_") ; XEmacs
+ − 137 (save-excursion
+ − 138 (let ((opoint (point)) beg end
+ − 139 total before after)
+ − 140 (forward-page)
+ − 141 (beginning-of-line)
+ − 142 (or (looking-at page-delimiter)
+ − 143 (end-of-line))
+ − 144 (setq end (point))
+ − 145 (backward-page)
+ − 146 (setq beg (point))
+ − 147 (setq total (count-lines beg end)
+ − 148 before (count-lines beg opoint)
+ − 149 after (count-lines opoint end))
+ − 150 (message "Page has %d lines (%d + %d)" total before after))))
+ − 151
+ − 152 (defun what-page ()
+ − 153 "Print page and line number of point."
+ − 154 (interactive "_") ; XEmacs
+ − 155 (save-restriction
+ − 156 (widen)
+ − 157 (save-excursion
+ − 158 (beginning-of-line)
+ − 159 (let ((count 1)
+ − 160 (opoint (point)))
+ − 161 (goto-char 1)
+ − 162 (while (re-search-forward page-delimiter opoint t)
+ − 163 (setq count (1+ count)))
+ − 164 (message "Page %d, line %d"
+ − 165 count
+ − 166 (1+ (count-lines (point) opoint)))))))
+ − 167
+ − 168 ;;; Place `provide' at end of file.
+ − 169 (provide 'page)
+ − 170
+ − 171 ;;; page.el ends here
