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1 ;;; page.el --- page motion commands for emacs.
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2
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3 ;; Copyright (C) 1985 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: FSF 19.30.
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24
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25 ;;; Commentary:
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26
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27 ;; This code provides the page-oriented movement and selection commands
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28 ;; documented in the XEmacs Reference Manual.
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29
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30 ;;; Code:
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31
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32 (defun forward-page (&optional count)
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33 "Move forward to page boundary. With arg, repeat, or go back if negative.
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34 A page boundary is any line whose beginning matches the regexp
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35 `page-delimiter'."
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36 (interactive "_p")
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37 (or count (setq count 1))
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38 (while (and (> count 0) (not (eobp)))
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39 ;; In case the page-delimiter matches the null string,
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40 ;; don't find a match without moving.
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41 (if (bolp) (forward-char 1))
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42 (if (re-search-forward page-delimiter nil t)
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43 nil
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44 (goto-char (point-max)))
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45 (setq count (1- count)))
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46 (while (and (< count 0) (not (bobp)))
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47 (forward-char -1)
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48 (let (result (end (point)))
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49 ;; If we find a match that ends where we started searching,
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50 ;; look for another one.
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51 (while (and (setq result (re-search-backward page-delimiter nil t))
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52 (= (match-end 0) end))
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53 ;; Just search again.
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54 )
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55 (if result
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56 ;; We found one--move to the end of it.
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57 (goto-char (match-end 0))
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58 ;; We found nothing--go to beg of buffer.
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59 (goto-char (point-min))))
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60 (setq count (1+ count))))
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61
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62 (defun backward-page (&optional count)
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63 "Move backward to page boundary. With arg, repeat, or go fwd if negative.
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64 A page boundary is any line whose beginning matches the regexp
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65 `page-delimiter'."
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66 (interactive "p")
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67 (or count (setq count 1))
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68 (forward-page (- count)))
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69
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70 (defun mark-page (&optional arg)
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71 "Put mark at end of page, point at beginning.
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72 A numeric arg specifies to move forward or backward by that many pages,
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73 thus marking a page other than the one point was originally in."
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74 (interactive "P")
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75 (setq arg (if arg (prefix-numeric-value arg) 0))
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76 (if (> arg 0)
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77 (forward-page arg)
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78 (if (< arg 0)
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79 (forward-page (1- arg))))
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80 (forward-page)
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81 (push-mark nil t t)
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82 (forward-page -1))
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83
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84 (defun narrow-to-page (&optional arg)
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85 "Make text outside current page invisible.
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86 A numeric arg specifies to move forward or backward by that many pages,
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87 thus showing a page other than the one point was originally in."
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88 (interactive "P")
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89 (setq arg (if arg (prefix-numeric-value arg) 0))
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90 (save-excursion
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91 (widen)
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92 (if (> arg 0)
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93 (forward-page arg)
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94 (if (< arg 0)
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95 (forward-page (1- arg))))
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96 ;; Find the end of the page.
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97 (forward-page)
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98 ;; If we stopped due to end of buffer, stay there.
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99 ;; If we stopped after a page delimiter, put end of restriction
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100 ;; at the beginning of that line.
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101 (if (save-excursion
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102 (goto-char (match-beginning 0)) ; was (beginning-of-line)
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103 (looking-at page-delimiter))
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104 (beginning-of-line))
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105 (narrow-to-region (point)
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106 (progn
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107 ;; Find the top of the page.
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108 (forward-page -1)
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109 ;; If we found beginning of buffer, stay there.
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110 ;; If extra text follows page delimiter on same line,
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111 ;; include it.
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112 ;; Otherwise, show text starting with following line.
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113 (if (and (eolp) (not (bobp)))
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114 (forward-line 1))
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115 (point)))))
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116
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117 (defun count-lines-page ()
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118 "Report number of lines on current page, and how many are before or after point."
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119 (interactive "_")
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120 (save-excursion
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121 (let ((opoint (point)) beg end
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122 total before after)
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123 (forward-page)
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124 (beginning-of-line)
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125 (or (looking-at page-delimiter)
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126 (end-of-line))
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127 (setq end (point))
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128 (backward-page)
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129 (setq beg (point))
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130 (setq total (count-lines beg end)
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131 before (count-lines beg opoint)
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132 after (count-lines opoint end))
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133 (message "Page has %d lines (%d + %d)" total before after))))
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134
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135 (defun what-page ()
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136 "Print page and line number of point."
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137 (interactive "_")
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138 (save-restriction
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139 (widen)
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140 (save-excursion
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141 (beginning-of-line)
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142 (let ((count 1)
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143 (opoint (point)))
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144 (goto-char 1)
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145 (while (re-search-forward page-delimiter opoint t)
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146 (setq count (1+ count)))
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147 (message "Page %d, line %d"
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148 count
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149 (1+ (count-lines (point) opoint)))))))
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150
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151 ;;; Place `provide' at end of file.
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152 (provide 'page)
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153
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154 ;;; page.el ends here
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