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1.1 root 1: ;; Page motion commands for emacs.
2: ;; Copyright (C) 1985 Richard M. Stallman.
3:
4: ;; This file is part of GNU Emacs.
5:
6: ;; GNU Emacs is distributed in the hope that it will be useful,
7: ;; but WITHOUT ANY WARRANTY. No author or distributor
8: ;; accepts responsibility to anyone for the consequences of using it
9: ;; or for whether it serves any particular purpose or works at all,
10: ;; unless he says so in writing. Refer to the GNU Emacs General Public
11: ;; License for full details.
12:
13: ;; Everyone is granted permission to copy, modify and redistribute
14: ;; GNU Emacs, but only under the conditions described in the
15: ;; GNU Emacs General Public License. A copy of this license is
16: ;; supposed to have been given to you along with GNU Emacs so you
17: ;; can know your rights and responsibilities. It should be in a
18: ;; file named COPYING. Among other things, the copyright notice
19: ;; and this notice must be preserved on all copies.
20:
21:
22: (defun forward-page (&optional count)
23: "Move forward to page boundary. With arg, repeat, or go back if negative.
24: A page boundary is any line whose beginning matches the regexp page-delimiter."
25: (interactive "p")
26: (or count (setq count 1))
27: (while (and (> count 0) (not (eobp)))
28: (if (re-search-forward page-delimiter nil t)
29: nil
30: (goto-char (point-max)))
31: (setq count (1- count)))
32: (while (and (< count 0) (not (bobp)))
33: (forward-char -1)
34: (if (re-search-backward page-delimiter nil t)
35: (goto-char (match-end 0))
36: (goto-char (point-min)))
37: (setq count (1+ count))))
38:
39: (defun backward-page (&optional count)
40: "Move backward to page boundary. With arg, repeat, or go fwd if negative.
41: A page boundary is any line whose beginning matches the regexp page-delimiter."
42: (interactive "p")
43: (or count (setq count 1))
44: (forward-page (- count)))
45:
46: (defun mark-page (&optional arg)
47: "Put mark at end of page, point at beginning.
48: A numeric arg specifies to move forward or backward by that many pages,
49: thus marking a page other than the one point was originally in."
50: (interactive "P")
51: (setq arg (if arg (prefix-numeric-value arg) 0))
52: (if (> arg 0)
53: (forward-page arg)
54: (if (< arg 0)
55: (forward-page (1- arg))))
56: (forward-page)
57: (set-mark (point))
58: (forward-page -1))
59:
60: (defun narrow-to-page (&optional arg)
61: "Make text outside current page invisible.
62: A numeric arg specifies to move forward or backward by that many pages,
63: thus showing a page other than the one point was originally in."
64: (interactive "P")
65: (setq arg (if arg (prefix-numeric-value arg) 0))
66: (save-excursion
67: (if (> arg 0)
68: (forward-page arg)
69: (if (< arg 0)
70: (forward-page (1- arg))))
71: (forward-page)
72: (beginning-of-line)
73: (narrow-to-region (point)
74: (progn
75: (forward-page -1)
76: (point)))))
77:
78: (defun count-lines-page ()
79: "Report number of lines on current page, and how many are before or after point."
80: (interactive)
81: (save-excursion
82: (let ((opoint (point)) beg end
83: total before after)
84: (forward-page)
85: (beginning-of-line)
86: (setq end (point))
87: (backward-page)
88: (setq beg (point))
89: (setq total (count-lines beg end)
90: before (count-lines beg opoint)
91: after (count-lines opoint end))
92: (message "Page has %d lines (%d + %d)" total before after))))
93:
94: (defun what-page ()
95: "Print page and line number of point."
96: (interactive)
97: (let ((count 1) opoint)
98: (save-restriction
99: (widen)
100: (save-excursion
101: (beginning-of-line)
102: (setq opoint (point))
103: (goto-char 1)
104: (while (re-search-forward page-delimiter opoint t)
105: (setq count (1+ count)))
106: (message "Page %d, line %d" count (1+ (count-lines (point) opoint)))))))
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