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1.1 root 1: ;; Page motion commands for emacs.
2: ;; Copyright (C) 1985 Free Software Foundation, Inc.
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: (push-mark nil t)
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: (widen)
68: (if (> arg 0)
69: (forward-page arg)
70: (if (< arg 0)
71: (forward-page (1- arg))))
72: ;; Find the end of the page.
73: (forward-page)
74: ;; If we stopped due to end of buffer, stay there.
75: ;; If we stopped after a page delimiter, put end of restriction
76: ;; at the beginning of that line.
77: (if (save-excursion (beginning-of-line)
78: (looking-at page-delimiter))
79: (beginning-of-line))
80: (narrow-to-region (point)
81: (progn
82: ;; Find the top of the page.
83: (forward-page -1)
84: ;; If we found beginning of buffer, stay there.
85: ;; If extra text follows page delimiter on same line,
86: ;; include it.
87: ;; Otherwise, show text starting with following line.
88: (if (and (eolp) (not (bobp)))
89: (forward-line 1))
90: (point)))))
91:
92: (defun count-lines-page ()
93: "Report number of lines on current page, and how many are before or after point."
94: (interactive)
95: (save-excursion
96: (let ((opoint (point)) beg end
97: total before after)
98: (forward-page)
99: (beginning-of-line)
100: (or (looking-at page-delimiter)
101: (end-of-line))
102: (setq end (point))
103: (backward-page)
104: (setq beg (point))
105: (setq total (count-lines beg end)
106: before (count-lines beg opoint)
107: after (count-lines opoint end))
108: (message "Page has %d lines (%d + %d)" total before after))))
109:
110: (defun what-page ()
111: "Print page and line number of point."
112: (interactive)
113: (save-restriction
114: (widen)
115: (save-excursion
116: (let ((count 1)
117: (opoint (point)))
118: (goto-char 1)
119: (while (re-search-forward page-delimiter opoint t)
120: (setq count (1+ count)))
121: (message "Page %d, line %d"
122: count
123: (1+ (count-lines (point) opoint)))))))
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