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1 | ;;; page.el --- page motion commands for emacs. |
2 | ||
a2535589 JA |
3 | ;; Copyright (C) 1985 Free Software Foundation, Inc. |
4 | ||
5 | ;; This file is part of GNU Emacs. | |
6 | ||
7 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
8 | ;; it under the terms of the GNU General Public License as published by | |
9 | ;; the Free Software Foundation; either version 1, or (at your option) | |
10 | ;; any later version. | |
11 | ||
12 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
13 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;; GNU General Public License for more details. | |
16 | ||
17 | ;; You should have received a copy of the GNU General Public License | |
18 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
19 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | ||
21 | ||
22 | (defun forward-page (&optional count) | |
23 | "Move forward to page boundary. With arg, repeat, or go back if negative. | |
fa8a7944 JB |
24 | A page boundary is any line whose beginning matches the regexp |
25 | `page-delimiter'." | |
a2535589 JA |
26 | (interactive "p") |
27 | (or count (setq count 1)) | |
28 | (while (and (> count 0) (not (eobp))) | |
29 | (if (re-search-forward page-delimiter nil t) | |
30 | nil | |
31 | (goto-char (point-max))) | |
32 | (setq count (1- count))) | |
33 | (while (and (< count 0) (not (bobp))) | |
34 | (forward-char -1) | |
35 | (if (re-search-backward page-delimiter nil t) | |
36 | (goto-char (match-end 0)) | |
37 | (goto-char (point-min))) | |
38 | (setq count (1+ count)))) | |
39 | ||
40 | (defun backward-page (&optional count) | |
41 | "Move backward to page boundary. With arg, repeat, or go fwd if negative. | |
fa8a7944 JB |
42 | A page boundary is any line whose beginning matches the regexp |
43 | `page-delimiter'." | |
a2535589 JA |
44 | (interactive "p") |
45 | (or count (setq count 1)) | |
46 | (forward-page (- count))) | |
47 | ||
48 | (defun mark-page (&optional arg) | |
49 | "Put mark at end of page, point at beginning. | |
50 | A numeric arg specifies to move forward or backward by that many pages, | |
51 | thus marking a page other than the one point was originally in." | |
52 | (interactive "P") | |
53 | (setq arg (if arg (prefix-numeric-value arg) 0)) | |
54 | (if (> arg 0) | |
55 | (forward-page arg) | |
56 | (if (< arg 0) | |
57 | (forward-page (1- arg)))) | |
58 | (forward-page) | |
59 | (push-mark nil t) | |
60 | (forward-page -1)) | |
61 | ||
62 | (defun narrow-to-page (&optional arg) | |
63 | "Make text outside current page invisible. | |
64 | A numeric arg specifies to move forward or backward by that many pages, | |
65 | thus showing a page other than the one point was originally in." | |
66 | (interactive "P") | |
67 | (setq arg (if arg (prefix-numeric-value arg) 0)) | |
68 | (save-excursion | |
69 | (widen) | |
70 | (if (> arg 0) | |
71 | (forward-page arg) | |
72 | (if (< arg 0) | |
73 | (forward-page (1- arg)))) | |
74 | ;; Find the end of the page. | |
75 | (forward-page) | |
76 | ;; If we stopped due to end of buffer, stay there. | |
77 | ;; If we stopped after a page delimiter, put end of restriction | |
78 | ;; at the beginning of that line. | |
79 | (if (save-excursion (beginning-of-line) | |
80 | (looking-at page-delimiter)) | |
81 | (beginning-of-line)) | |
82 | (narrow-to-region (point) | |
83 | (progn | |
84 | ;; Find the top of the page. | |
85 | (forward-page -1) | |
86 | ;; If we found beginning of buffer, stay there. | |
87 | ;; If extra text follows page delimiter on same line, | |
88 | ;; include it. | |
89 | ;; Otherwise, show text starting with following line. | |
90 | (if (and (eolp) (not (bobp))) | |
91 | (forward-line 1)) | |
92 | (point))))) | |
6594deb0 | 93 | (put 'narrow-to-page 'disabled t) |
a2535589 JA |
94 | |
95 | (defun count-lines-page () | |
96 | "Report number of lines on current page, and how many are before or after point." | |
97 | (interactive) | |
98 | (save-excursion | |
99 | (let ((opoint (point)) beg end | |
100 | total before after) | |
101 | (forward-page) | |
102 | (beginning-of-line) | |
103 | (or (looking-at page-delimiter) | |
104 | (end-of-line)) | |
105 | (setq end (point)) | |
106 | (backward-page) | |
107 | (setq beg (point)) | |
108 | (setq total (count-lines beg end) | |
109 | before (count-lines beg opoint) | |
110 | after (count-lines opoint end)) | |
111 | (message "Page has %d lines (%d + %d)" total before after)))) | |
112 | ||
113 | (defun what-page () | |
114 | "Print page and line number of point." | |
115 | (interactive) | |
116 | (save-restriction | |
117 | (widen) | |
118 | (save-excursion | |
119 | (beginning-of-line) | |
120 | (let ((count 1) | |
121 | (opoint (point))) | |
122 | (goto-char 1) | |
123 | (while (re-search-forward page-delimiter opoint t) | |
124 | (setq count (1+ count))) | |
125 | (message "Page %d, line %d" | |
126 | count | |
127 | (1+ (count-lines (point) opoint))))))) | |
6594deb0 ER |
128 | |
129 | ;;; page.el ends here |