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1 | ;;; page.el --- page motion commands for emacs. |
2 | ||
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3 | ;; Copyright (C) 1985 Free Software Foundation, Inc. |
4 | ||
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5 | ;; Maintainer: FSF |
6 | ||
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7 | ;; This file is part of GNU Emacs. |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 11 | ;; the Free Software Foundation; either version 2, or (at your option) |
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12 | ;; any later version. |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
a2535589 | 23 | |
edbd2f74 ER |
24 | ;;; Commentary: |
25 | ||
26 | ;; This code provides the page-oriented movement and selection commands | |
27 | ;; documented in the Emacs manual. | |
28 | ||
e5167999 | 29 | ;;; Code: |
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30 | |
31 | (defun forward-page (&optional count) | |
32 | "Move forward to page boundary. With arg, repeat, or go back if negative. | |
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33 | A page boundary is any line whose beginning matches the regexp |
34 | `page-delimiter'." | |
a2535589 JA |
35 | (interactive "p") |
36 | (or count (setq count 1)) | |
37 | (while (and (> count 0) (not (eobp))) | |
07f4ea75 RS |
38 | ;; In case the page-delimiter matches the null string, |
39 | ;; don't find a match without moving. | |
40 | (if (bolp) (forward-char 1)) | |
a2535589 JA |
41 | (if (re-search-forward page-delimiter nil t) |
42 | nil | |
43 | (goto-char (point-max))) | |
44 | (setq count (1- count))) | |
45 | (while (and (< count 0) (not (bobp))) | |
b69863f2 RS |
46 | ;; In case the page-delimiter matches the null string, |
47 | ;; don't find a match without moving. | |
48 | (and (save-excursion (re-search-backward page-delimiter nil t)) | |
49 | (= (match-end 0) (point)) | |
50 | (goto-char (match-beginning 0))) | |
a2535589 | 51 | (forward-char -1) |
b69863f2 RS |
52 | (if (re-search-backward page-delimiter nil t) |
53 | ;; We found one--move to the end of it. | |
54 | (goto-char (match-end 0)) | |
55 | ;; We found nothing--go to beg of buffer. | |
56 | (goto-char (point-min))) | |
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57 | (setq count (1+ count)))) |
58 | ||
59 | (defun backward-page (&optional count) | |
60 | "Move backward to page boundary. With arg, repeat, or go fwd if negative. | |
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61 | A page boundary is any line whose beginning matches the regexp |
62 | `page-delimiter'." | |
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63 | (interactive "p") |
64 | (or count (setq count 1)) | |
65 | (forward-page (- count))) | |
66 | ||
67 | (defun mark-page (&optional arg) | |
68 | "Put mark at end of page, point at beginning. | |
69 | A numeric arg specifies to move forward or backward by that many pages, | |
70 | thus marking a page other than the one point was originally in." | |
71 | (interactive "P") | |
72 | (setq arg (if arg (prefix-numeric-value arg) 0)) | |
73 | (if (> arg 0) | |
74 | (forward-page arg) | |
75 | (if (< arg 0) | |
76 | (forward-page (1- arg)))) | |
77 | (forward-page) | |
6be72a0b | 78 | (push-mark nil t t) |
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79 | (forward-page -1)) |
80 | ||
81 | (defun narrow-to-page (&optional arg) | |
82 | "Make text outside current page invisible. | |
83 | A numeric arg specifies to move forward or backward by that many pages, | |
84 | thus showing a page other than the one point was originally in." | |
85 | (interactive "P") | |
86 | (setq arg (if arg (prefix-numeric-value arg) 0)) | |
87 | (save-excursion | |
88 | (widen) | |
89 | (if (> arg 0) | |
90 | (forward-page arg) | |
91 | (if (< arg 0) | |
cb70d915 RS |
92 | (let ((adjust 0) |
93 | (opoint (point))) | |
94 | ;; If we are not now at the beginning of a page, | |
95 | ;; move back one extra time, to get to the start of this page. | |
96 | (save-excursion | |
97 | (beginning-of-line) | |
98 | (or (and (looking-at page-delimiter) | |
99 | (eq (match-end 0) opoint)) | |
100 | (setq adjust 1))) | |
101 | (forward-page (- arg adjust))))) | |
a2535589 | 102 | ;; Find the end of the page. |
1577a8fd | 103 | (set-match-data nil) |
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104 | (forward-page) |
105 | ;; If we stopped due to end of buffer, stay there. | |
106 | ;; If we stopped after a page delimiter, put end of restriction | |
107 | ;; at the beginning of that line. | |
1577a8fd KH |
108 | ;; Before checking the match that was found, |
109 | ;; verify that forward-page actually set the match data. | |
110 | (if (and (match-beginning 0) | |
111 | (save-excursion | |
112 | (goto-char (match-beginning 0)) ; was (beginning-of-line) | |
113 | (looking-at page-delimiter))) | |
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114 | (beginning-of-line)) |
115 | (narrow-to-region (point) | |
116 | (progn | |
117 | ;; Find the top of the page. | |
118 | (forward-page -1) | |
119 | ;; If we found beginning of buffer, stay there. | |
120 | ;; If extra text follows page delimiter on same line, | |
121 | ;; include it. | |
122 | ;; Otherwise, show text starting with following line. | |
123 | (if (and (eolp) (not (bobp))) | |
124 | (forward-line 1)) | |
125 | (point))))) | |
6594deb0 | 126 | (put 'narrow-to-page 'disabled t) |
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127 | |
128 | (defun count-lines-page () | |
129 | "Report number of lines on current page, and how many are before or after point." | |
130 | (interactive) | |
131 | (save-excursion | |
132 | (let ((opoint (point)) beg end | |
133 | total before after) | |
134 | (forward-page) | |
135 | (beginning-of-line) | |
136 | (or (looking-at page-delimiter) | |
137 | (end-of-line)) | |
138 | (setq end (point)) | |
139 | (backward-page) | |
140 | (setq beg (point)) | |
141 | (setq total (count-lines beg end) | |
142 | before (count-lines beg opoint) | |
143 | after (count-lines opoint end)) | |
144 | (message "Page has %d lines (%d + %d)" total before after)))) | |
145 | ||
146 | (defun what-page () | |
147 | "Print page and line number of point." | |
148 | (interactive) | |
149 | (save-restriction | |
150 | (widen) | |
151 | (save-excursion | |
152 | (beginning-of-line) | |
153 | (let ((count 1) | |
154 | (opoint (point))) | |
155 | (goto-char 1) | |
156 | (while (re-search-forward page-delimiter opoint t) | |
157 | (setq count (1+ count))) | |
158 | (message "Page %d, line %d" | |
159 | count | |
160 | (1+ (count-lines (point) opoint))))))) | |
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161 | \f |
162 | ;;; Place `provide' at end of file. | |
163 | (provide 'page) | |
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164 | |
165 | ;;; page.el ends here |