LCOV - code coverage report
Current view: top level - lisp/textmodes - page.el (source / functions) Hit Total Coverage
Test: tramp-tests.info Lines: 0 77 0.0 %
Date: 2017-08-27 09:44:50 Functions: 0 6 0.0 %

          Line data    Source code
       1             : ;;; page.el --- page motion commands for Emacs
       2             : 
       3             : ;; Copyright (C) 1985, 2001-2017 Free Software Foundation, Inc.
       4             : 
       5             : ;; Maintainer: emacs-devel@gnu.org
       6             : ;; Keywords: wp convenience
       7             : ;; Package: emacs
       8             : 
       9             : ;; This file is part of GNU Emacs.
      10             : 
      11             : ;; GNU Emacs is free software: you can redistribute it and/or modify
      12             : ;; it under the terms of the GNU General Public License as published by
      13             : ;; the Free Software Foundation, either version 3 of the License, or
      14             : ;; (at your option) any later version.
      15             : 
      16             : ;; GNU Emacs is distributed in the hope that it will be useful,
      17             : ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
      18             : ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      19             : ;; GNU General Public License for more details.
      20             : 
      21             : ;; You should have received a copy of the GNU General Public License
      22             : ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
      23             : 
      24             : ;;; Commentary:
      25             : 
      26             : ;; This code provides the page-oriented movement and selection commands
      27             : ;; documented in the Emacs manual.
      28             : 
      29             : ;;; Code:
      30             : 
      31             : (defun forward-page (&optional count)
      32             :   "Move forward to page boundary.  With arg, repeat, or go back if negative.
      33             : A page boundary is any line whose beginning matches the regexp
      34             : `page-delimiter'."
      35             :   (interactive "p")
      36           0 :   (or count (setq count 1))
      37           0 :   (while (and (> count 0) (not (eobp)))
      38             :     ;; In case the page-delimiter matches the null string,
      39             :     ;; don't find a match without moving.
      40           0 :     (if (bolp) (forward-char 1))
      41           0 :     (if (re-search-forward page-delimiter nil t)
      42             :         nil
      43           0 :       (goto-char (point-max)))
      44           0 :     (setq count (1- count)))
      45           0 :   (while (and (< count 0) (not (bobp)))
      46             :     ;; In case the page-delimiter matches the null string,
      47             :     ;; don't find a match without moving.
      48           0 :     (and (save-excursion (re-search-backward page-delimiter nil t))
      49           0 :          (= (match-end 0) (point))
      50           0 :          (goto-char (match-beginning 0)))
      51           0 :     (unless (bobp)
      52           0 :       (forward-char -1)
      53           0 :       (if (re-search-backward page-delimiter nil t)
      54             :           ;; We found one--move to the end of it.
      55           0 :           (goto-char (match-end 0))
      56             :         ;; We found nothing--go to beg of buffer.
      57           0 :         (goto-char (point-min))))
      58           0 :     (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.
      62             : A page boundary is any line whose beginning matches the regexp
      63             : `page-delimiter'."
      64             :   (interactive "p")
      65           0 :   (or count (setq count 1))
      66           0 :   (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           0 :   (setq arg (if arg (prefix-numeric-value arg) 0))
      74           0 :   (if (> arg 0)
      75           0 :       (forward-page arg)
      76           0 :     (if (< arg 0)
      77           0 :         (forward-page (1- arg))))
      78           0 :   (forward-page)
      79           0 :   (push-mark nil t t)
      80           0 :   (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           0 :   (setq arg (if arg (prefix-numeric-value arg) 0))
      88           0 :   (save-excursion
      89           0 :     (widen)
      90           0 :     (if (> arg 0)
      91           0 :         (forward-page arg)
      92           0 :       (if (< arg 0)
      93           0 :           (let ((adjust 0)
      94           0 :                 (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           0 :             (save-excursion
      98           0 :               (beginning-of-line)
      99           0 :               (or (and (looking-at page-delimiter)
     100           0 :                        (eq (match-end 0) opoint))
     101           0 :                   (setq adjust 1)))
     102           0 :             (forward-page (- arg adjust)))))
     103             :     ;; Find the end of the page.
     104           0 :     (set-match-data nil)
     105           0 :     (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.
     109             :     ;; Before checking the match that was found,
     110             :     ;; verify that forward-page actually set the match data.
     111           0 :     (if (and (match-beginning 0)
     112           0 :              (save-excursion
     113           0 :                (goto-char (match-beginning 0)) ; was (beginning-of-line)
     114           0 :                (looking-at page-delimiter)))
     115           0 :         (goto-char (match-beginning 0))) ; was (beginning-of-line)
     116           0 :     (narrow-to-region (point)
     117           0 :                       (progn
     118             :                         ;; Find the top of the page.
     119           0 :                         (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           0 :                         (if (and (eolp) (not (bobp)))
     125           0 :                             (forward-line 1))
     126           0 :                         (point)))))
     127             : (put 'narrow-to-page 'disabled t)
     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           0 :   (save-excursion
     133           0 :     (let ((opoint (point)) beg end
     134             :           total before after)
     135           0 :       (forward-page)
     136           0 :       (beginning-of-line)
     137           0 :       (or (looking-at page-delimiter)
     138           0 :           (end-of-line))
     139           0 :       (setq end (point))
     140           0 :       (backward-page)
     141           0 :       (setq beg (point))
     142           0 :       (setq total (count-lines beg end)
     143           0 :             before (count-lines beg opoint)
     144           0 :             after (count-lines opoint end))
     145           0 :       (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           0 :   (save-restriction
     151           0 :     (widen)
     152           0 :     (save-excursion
     153           0 :       (let ((count 1)
     154           0 :             (opoint (point)))
     155           0 :         (goto-char (point-min))
     156           0 :         (while (re-search-forward page-delimiter opoint t)
     157           0 :           (if (= (match-beginning 0) (match-end 0))
     158           0 :               (forward-char 1))
     159           0 :           (setq count (1+ count)))
     160           0 :         (message "Page %d, line %d" count (line-number-at-pos opoint))))))
     161             : 
     162             : 
     163             : 
     164             : ;;; Place `provide' at end of file.
     165             : (provide 'page)
     166             : 
     167             : ;;; page.el ends here

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