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