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1 ;;; page.el --- page motion commands for Emacs
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209
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2
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3 ;; Copyright (C) 1985, 1997 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: extensions, dumped
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7 ;; Keywords: wp convenience
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209
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Synched up with: FSF 21.3.
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27
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28 ;;; Commentary:
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29
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30 ;; This file is dumped with XEmacs.
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31
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32 ;; This code provides the page-oriented movement and selection commands
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33 ;; documented in the XEmacs Reference Manual.
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34
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35 ;;; Code:
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36
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37 (defun forward-page (&optional count)
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38 "Move forward to page boundary. With arg, repeat, or go back if negative.
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39 A page boundary is any line whose beginning matches the regexp
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40 `page-delimiter'."
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41 (interactive "_p") ; XEmacs
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42 (or count (setq count 1))
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43 (while (and (> count 0) (not (eobp)))
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44 ;; In case the page-delimiter matches the null string,
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45 ;; don't find a match without moving.
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46 (if (bolp) (forward-char 1))
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47 (if (re-search-forward page-delimiter nil t)
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48 nil
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49 (goto-char (point-max)))
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50 (setq count (1- count)))
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51 (while (and (< count 0) (not (bobp)))
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52 ;; In case the page-delimiter matches the null string,
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53 ;; don't find a match without moving.
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54 (and (save-excursion (re-search-backward page-delimiter nil t))
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55 (= (match-end 0) (point))
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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)
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59 ;; We found one--move to the end of it.
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60 (goto-char (match-end 0))
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61 ;; We found nothing--go to beg of buffer.
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62 (goto-char (point-min)))
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63 (setq count (1+ count))))
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64
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65 (defun backward-page (&optional count)
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66 "Move backward to page boundary. With arg, repeat, or go fwd if negative.
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67 A page boundary is any line whose beginning matches the regexp
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68 `page-delimiter'."
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69 (interactive "_p") ; XEmacs
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70 (or count (setq count 1))
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71 (forward-page (- count)))
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72
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73 (defun mark-page (&optional arg)
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74 "Put mark at end of page, point at beginning.
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75 A numeric arg specifies to move forward or backward by that many pages,
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76 thus marking a page other than the one point was originally in."
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77 (interactive "P")
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78 (setq arg (if arg (prefix-numeric-value arg) 0))
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79 (if (> arg 0)
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80 (forward-page arg)
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81 (if (< arg 0)
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82 (forward-page (1- arg))))
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83 (forward-page)
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84 (push-mark nil t t)
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85 (forward-page -1))
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86
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87 (defun narrow-to-page (&optional arg)
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88 "Make text outside current page invisible.
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89 A numeric arg specifies to move forward or backward by that many pages,
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90 thus showing a page other than the one point was originally in."
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91 (interactive "P")
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92 (setq arg (if arg (prefix-numeric-value arg) 0))
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93 (save-excursion
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94 (widen)
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95 (if (> arg 0)
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96 (forward-page arg)
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97 (if (< arg 0)
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98 (let ((adjust 0)
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99 (opoint (point)))
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100 ;; If we are not now at the beginning of a page,
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101 ;; move back one extra time, to get to the start of this page.
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102 (save-excursion
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103 (beginning-of-line)
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104 (or (and (looking-at page-delimiter)
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105 (eq (match-end 0) opoint))
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106 (setq adjust 1)))
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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)
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111 ;; If we stopped due to end of buffer, stay there.
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112 ;; If we stopped after a page delimiter, put end of restriction
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113 ;; at the beginning of that line.
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114 ;; Before checking the match that was found,
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115 ;; verify that forward-page actually set the match data.
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116 (if (and (match-beginning 0)
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117 (save-excursion
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118 (goto-char (match-beginning 0)) ; was (beginning-of-line)
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119 (looking-at page-delimiter)))
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209
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120 (beginning-of-line))
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121 (narrow-to-region (point)
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122 (progn
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123 ;; Find the top of the page.
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124 (forward-page -1)
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125 ;; If we found beginning of buffer, stay there.
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126 ;; If extra text follows page delimiter on same line,
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127 ;; include it.
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128 ;; Otherwise, show text starting with following line.
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129 (if (and (eolp) (not (bobp)))
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130 (forward-line 1))
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131 (point)))))
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132 (put 'narrow-to-page 'disabled t)
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133
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134 (defun count-lines-page ()
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135 "Report number of lines on current page, and how many are before or after point."
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136 (interactive "_") ; XEmacs
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137 (save-excursion
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138 (let ((opoint (point)) beg end
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139 total before after)
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140 (forward-page)
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141 (beginning-of-line)
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142 (or (looking-at page-delimiter)
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143 (end-of-line))
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144 (setq end (point))
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145 (backward-page)
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146 (setq beg (point))
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147 (setq total (count-lines beg end)
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148 before (count-lines beg opoint)
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149 after (count-lines opoint end))
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150 (message "Page has %d lines (%d + %d)" total before after))))
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151
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152 (defun what-page ()
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153 "Print page and line number of point."
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154 (interactive "_") ; XEmacs
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155 (save-restriction
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156 (widen)
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157 (save-excursion
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158 (beginning-of-line)
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159 (let ((count 1)
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160 (opoint (point)))
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161 (goto-char 1)
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162 (while (re-search-forward page-delimiter opoint t)
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163 (setq count (1+ count)))
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164 (message "Page %d, line %d"
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165 count
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166 (1+ (count-lines (point) opoint)))))))
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167
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168 ;;; Place `provide' at end of file.
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169 (provide 'page)
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170
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171 ;;; page.el ends here
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