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55535639 | 1 | ;;; page.el --- page motion commands for Emacs |
6594deb0 | 2 | |
a2535589 JA |
3 | ;; Copyright (C) 1985 Free Software Foundation, Inc. |
4 | ||
3a801d0c | 5 | ;; Maintainer: FSF |
6228c05b | 6 | ;; Keywords: wp convenience |
3a801d0c | 7 | |
a2535589 JA |
8 | ;; This file is part of GNU Emacs. |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
13 | ;; any later version. |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
a2535589 | 24 | |
edbd2f74 ER |
25 | ;;; Commentary: |
26 | ||
27 | ;; This code provides the page-oriented movement and selection commands | |
28 | ;; documented in the Emacs manual. | |
29 | ||
e5167999 | 30 | ;;; Code: |
a2535589 JA |
31 | |
32 | (defun forward-page (&optional count) | |
33 | "Move forward to page boundary. With arg, repeat, or go back if negative. | |
fa8a7944 JB |
34 | A page boundary is any line whose beginning matches the regexp |
35 | `page-delimiter'." | |
a2535589 JA |
36 | (interactive "p") |
37 | (or count (setq count 1)) | |
38 | (while (and (> count 0) (not (eobp))) | |
07f4ea75 RS |
39 | ;; In case the page-delimiter matches the null string, |
40 | ;; don't find a match without moving. | |
41 | (if (bolp) (forward-char 1)) | |
a2535589 JA |
42 | (if (re-search-forward page-delimiter nil t) |
43 | nil | |
44 | (goto-char (point-max))) | |
45 | (setq count (1- count))) | |
46 | (while (and (< count 0) (not (bobp))) | |
b69863f2 RS |
47 | ;; In case the page-delimiter matches the null string, |
48 | ;; don't find a match without moving. | |
49 | (and (save-excursion (re-search-backward page-delimiter nil t)) | |
50 | (= (match-end 0) (point)) | |
51 | (goto-char (match-beginning 0))) | |
a2535589 | 52 | (forward-char -1) |
b69863f2 RS |
53 | (if (re-search-backward page-delimiter nil t) |
54 | ;; We found one--move to the end of it. | |
55 | (goto-char (match-end 0)) | |
56 | ;; We found nothing--go to beg of buffer. | |
57 | (goto-char (point-min))) | |
a2535589 JA |
58 | (setq count (1+ count)))) |
59 | ||
60 | (defun backward-page (&optional count) | |
61 | "Move backward to page boundary. With arg, repeat, or go fwd if negative. | |
fa8a7944 JB |
62 | A page boundary is any line whose beginning matches the regexp |
63 | `page-delimiter'." | |
a2535589 JA |
64 | (interactive "p") |
65 | (or count (setq count 1)) | |
66 | (forward-page (- count))) | |
67 | ||
68 | (defun mark-page (&optional arg) | |
69 | "Put mark at end of page, point at beginning. | |
70 | A numeric arg specifies to move forward or backward by that many pages, | |
71 | thus marking a page other than the one point was originally in." | |
72 | (interactive "P") | |
73 | (setq arg (if arg (prefix-numeric-value arg) 0)) | |
74 | (if (> arg 0) | |
75 | (forward-page arg) | |
76 | (if (< arg 0) | |
77 | (forward-page (1- arg)))) | |
78 | (forward-page) | |
6be72a0b | 79 | (push-mark nil t t) |
a2535589 JA |
80 | (forward-page -1)) |
81 | ||
82 | (defun narrow-to-page (&optional arg) | |
83 | "Make text outside current page invisible. | |
84 | A numeric arg specifies to move forward or backward by that many pages, | |
85 | thus showing a page other than the one point was originally in." | |
86 | (interactive "P") | |
87 | (setq arg (if arg (prefix-numeric-value arg) 0)) | |
88 | (save-excursion | |
89 | (widen) | |
90 | (if (> arg 0) | |
91 | (forward-page arg) | |
92 | (if (< arg 0) | |
cb70d915 RS |
93 | (let ((adjust 0) |
94 | (opoint (point))) | |
95 | ;; If we are not now at the beginning of a page, | |
96 | ;; move back one extra time, to get to the start of this page. | |
97 | (save-excursion | |
98 | (beginning-of-line) | |
99 | (or (and (looking-at page-delimiter) | |
100 | (eq (match-end 0) opoint)) | |
101 | (setq adjust 1))) | |
102 | (forward-page (- arg adjust))))) | |
a2535589 | 103 | ;; Find the end of the page. |
1577a8fd | 104 | (set-match-data nil) |
a2535589 JA |
105 | (forward-page) |
106 | ;; If we stopped due to end of buffer, stay there. | |
107 | ;; If we stopped after a page delimiter, put end of restriction | |
108 | ;; at the beginning of that line. | |
1577a8fd KH |
109 | ;; Before checking the match that was found, |
110 | ;; verify that forward-page actually set the match data. | |
111 | (if (and (match-beginning 0) | |
112 | (save-excursion | |
113 | (goto-char (match-beginning 0)) ; was (beginning-of-line) | |
114 | (looking-at page-delimiter))) | |
a2535589 JA |
115 | (beginning-of-line)) |
116 | (narrow-to-region (point) | |
117 | (progn | |
118 | ;; Find the top of the page. | |
119 | (forward-page -1) | |
120 | ;; If we found beginning of buffer, stay there. | |
121 | ;; If extra text follows page delimiter on same line, | |
122 | ;; include it. | |
123 | ;; Otherwise, show text starting with following line. | |
124 | (if (and (eolp) (not (bobp))) | |
125 | (forward-line 1)) | |
126 | (point))))) | |
6594deb0 | 127 | (put 'narrow-to-page 'disabled t) |
a2535589 JA |
128 | |
129 | (defun count-lines-page () | |
130 | "Report number of lines on current page, and how many are before or after point." | |
131 | (interactive) | |
132 | (save-excursion | |
133 | (let ((opoint (point)) beg end | |
134 | total before after) | |
135 | (forward-page) | |
136 | (beginning-of-line) | |
137 | (or (looking-at page-delimiter) | |
138 | (end-of-line)) | |
139 | (setq end (point)) | |
140 | (backward-page) | |
141 | (setq beg (point)) | |
142 | (setq total (count-lines beg end) | |
143 | before (count-lines beg opoint) | |
144 | after (count-lines opoint end)) | |
145 | (message "Page has %d lines (%d + %d)" total before after)))) | |
146 | ||
147 | (defun what-page () | |
148 | "Print page and line number of point." | |
149 | (interactive) | |
150 | (save-restriction | |
151 | (widen) | |
152 | (save-excursion | |
153 | (beginning-of-line) | |
154 | (let ((count 1) | |
155 | (opoint (point))) | |
156 | (goto-char 1) | |
157 | (while (re-search-forward page-delimiter opoint t) | |
158 | (setq count (1+ count))) | |
159 | (message "Page %d, line %d" | |
160 | count | |
161 | (1+ (count-lines (point) opoint))))))) | |
8105b77e RS |
162 | \f |
163 | ;;; Place `provide' at end of file. | |
164 | (provide 'page) | |
6594deb0 | 165 | |
ab5796a9 | 166 | ;;; arch-tag: e8d7a0bd-8655-4b6e-b852-f2ee25316a1d |
6594deb0 | 167 | ;;; page.el ends here |