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390 lines
15 KiB
EmacsLisp
390 lines
15 KiB
EmacsLisp
;; View: Peruse file or buffer without editing.
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;; Copyright (C) 1985, 1989 Free Software Foundation, Inc.
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;; Principal author K. Shane Hartman
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 1, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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(provide 'view)
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(defvar view-mode-map nil)
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(if view-mode-map
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nil
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(setq view-mode-map (make-keymap))
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(fillarray view-mode-map 'View-undefined)
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(define-key view-mode-map "\C-c" 'view-exit)
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(define-key view-mode-map "\C-z" 'suspend-emacs)
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(define-key view-mode-map "q" 'view-exit)
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(define-key view-mode-map "-" 'negative-argument)
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(define-key view-mode-map "0" 'digit-argument)
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(define-key view-mode-map "1" 'digit-argument)
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(define-key view-mode-map "2" 'digit-argument)
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(define-key view-mode-map "3" 'digit-argument)
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(define-key view-mode-map "4" 'digit-argument)
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(define-key view-mode-map "5" 'digit-argument)
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(define-key view-mode-map "6" 'digit-argument)
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(define-key view-mode-map "7" 'digit-argument)
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(define-key view-mode-map "8" 'digit-argument)
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(define-key view-mode-map "9" 'digit-argument)
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(define-key view-mode-map "\C-u" 'universal-argument)
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(define-key view-mode-map "\e" nil)
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(define-key view-mode-map "\C-x" 'Control-X-prefix)
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(define-key view-mode-map "\e-" 'negative-argument)
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(define-key view-mode-map "\e0" 'digit-argument)
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(define-key view-mode-map "\e1" 'digit-argument)
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(define-key view-mode-map "\e2" 'digit-argument)
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(define-key view-mode-map "\e3" 'digit-argument)
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(define-key view-mode-map "\e4" 'digit-argument)
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(define-key view-mode-map "\e5" 'digit-argument)
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(define-key view-mode-map "\e6" 'digit-argument)
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(define-key view-mode-map "\e7" 'digit-argument)
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(define-key view-mode-map "\e8" 'digit-argument)
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(define-key view-mode-map "\e9" 'digit-argument)
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(define-key view-mode-map "<" 'beginning-of-buffer)
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(define-key view-mode-map ">" 'end-of-buffer)
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(define-key view-mode-map "\ev" 'View-scroll-lines-backward)
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(define-key view-mode-map "\C-v" 'View-scroll-lines-forward)
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(define-key view-mode-map " " 'View-scroll-lines-forward)
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(define-key view-mode-map "\177" 'View-scroll-lines-backward)
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(define-key view-mode-map "\n" 'View-scroll-one-more-line)
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(define-key view-mode-map "\r" 'View-scroll-one-more-line)
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(define-key view-mode-map "\C-l" 'recenter)
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(define-key view-mode-map "z" 'View-scroll-lines-forward-set-scroll-size)
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(define-key view-mode-map "g" 'View-goto-line)
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(define-key view-mode-map "=" 'what-line)
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(define-key view-mode-map "." 'set-mark-command)
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(define-key view-mode-map "\C-@" 'set-mark-command)
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(define-key view-mode-map "'" 'View-back-to-mark)
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(define-key view-mode-map "@" 'View-back-to-mark)
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(define-key view-mode-map "x" 'exchange-point-and-mark)
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(define-key view-mode-map "h" 'Helper-describe-bindings)
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(define-key view-mode-map "?" 'Helper-describe-bindings)
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(define-key view-mode-map "\C-h" 'Helper-help)
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(define-key view-mode-map "\C-n" 'next-line)
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(define-key view-mode-map "\C-p" 'previous-line)
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(define-key view-mode-map "\C-s" 'isearch-forward)
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(define-key view-mode-map "\C-r" 'isearch-backward)
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(define-key view-mode-map "s" 'isearch-forward)
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(define-key view-mode-map "r" 'isearch-backward)
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(define-key view-mode-map "/" 'View-search-regexp-forward)
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(define-key view-mode-map "\\" 'View-search-regexp-backward)
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;; This conflicts with the standard binding of isearch-regexp-forward
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(define-key view-mode-map "\e\C-s" 'View-search-regexp-forward)
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(define-key view-mode-map "\e\C-r" 'View-search-regexp-backward)
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(define-key view-mode-map "n" 'View-search-last-regexp-forward)
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(define-key view-mode-map "p" 'View-search-last-regexp-backward)
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)
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(defun view-file (file-name)
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"View FILE in View mode, returning to previous buffer when done.
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The usual Emacs commands are not available; instead,
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a special set of commands (mostly letters and punctuation)
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are defined for moving around in the buffer.
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Space scrolls forward, Delete scrolls backward.
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For list of all View commands, type ? or h while viewing.
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Calls the value of view-hook if that is non-nil."
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(interactive "fView file: ")
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(let ((old-buf (current-buffer))
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(had-a-buf (get-file-buffer file-name))
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(buf-to-view (find-file-noselect file-name)))
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(switch-to-buffer buf-to-view t)
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(view-mode old-buf
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(and (not had-a-buf) (not (buffer-modified-p buf-to-view))
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'kill-buffer))))
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(defun view-buffer (buffer-name)
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"View BUFFER in View mode, returning to previous buffer when done.
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The usual Emacs commands are not available; instead,
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a special set of commands (mostly letters and punctuation)
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are defined for moving around in the buffer.
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Space scrolls forward, Delete scrolls backward.
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For list of all View commands, type ? or h while viewing.
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Calls the value of view-hook if that is non-nil."
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(interactive "bView buffer: ")
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(let ((old-buf (current-buffer)))
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(switch-to-buffer buffer-name t)
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(view-mode old-buf nil)))
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(defun view-mode (&optional prev-buffer action)
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"Major mode for viewing text but not editing it.
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Letters do not insert themselves. Instead these commands are provided.
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Most commands take prefix arguments. Commands dealing with lines
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default to \"scroll size\" lines (initially size of window).
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Search commands default to a repeat count of one.
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M-< or < move to beginning of buffer.
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M-> or > move to end of buffer.
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C-v or Space scroll forward lines.
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M-v or DEL scroll backward lines.
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CR or LF scroll forward one line (backward with prefix argument).
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z like Space except set number of lines for further
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scrolling commands to scroll by.
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C-u and Digits provide prefix arguments. `-' denotes negative argument.
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= prints the current line number.
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g goes to line given by prefix argument.
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/ or M-C-s searches forward for regular expression
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\\ or M-C-r searches backward for regular expression.
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n searches forward for last regular expression.
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p searches backward for last regular expression.
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C-@ or . set the mark.
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x exchanges point and mark.
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C-s or s do forward incremental search.
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C-r or r do reverse incremental search.
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@ or ' return to mark and pops mark ring.
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Mark ring is pushed at start of every
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successful search and when jump to line to occurs.
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The mark is set on jump to buffer start or end.
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? or h provide help message (list of commands).
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C-h provides help (list of commands or description of a command).
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C-n moves down lines vertically.
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C-p moves upward lines vertically.
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C-l recenters the screen.
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q or C-c exit view-mode and return to previous buffer.
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Entry to this mode calls the value of view-hook if non-nil.
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\\{view-mode-map}"
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; Not interactive because dangerous things happen
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; if you call it without passing a buffer as argument
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; and they are not easy to fix.
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; (interactive)
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(make-local-variable 'view-old-mode-line-buffer-identification)
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(setq view-old-mode-line-buffer-identification
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mode-line-buffer-identification)
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(make-local-variable 'view-old-buffer-read-only)
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(setq view-old-buffer-read-only buffer-read-only)
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(make-local-variable 'view-old-mode-name)
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(setq view-old-mode-name mode-name)
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(make-local-variable 'view-old-major-mode)
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(setq view-old-major-mode major-mode)
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(make-local-variable 'view-old-local-map)
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(setq view-old-local-map (current-local-map))
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(make-local-variable 'view-old-Helper-return-blurb)
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(setq view-old-Helper-return-blurb
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(and (boundp 'Helper-return-blurb) Helper-return-blurb))
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(setq buffer-read-only t)
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(setq mode-line-buffer-identification
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(list
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(if (buffer-file-name)
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"Viewing %f"
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"Viewing %b")))
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(setq mode-name "View")
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(setq major-mode 'view-mode)
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(setq Helper-return-blurb
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(format "continue viewing %s"
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(if (buffer-file-name)
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(file-name-nondirectory (buffer-file-name))
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(buffer-name))))
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(make-local-variable 'view-exit-action)
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(setq view-exit-action action)
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(make-local-variable 'view-prev-buffer)
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(setq view-prev-buffer prev-buffer)
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(make-local-variable 'view-exit-position)
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(setq view-exit-position (point-marker))
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(make-local-variable 'view-scroll-size)
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(setq view-scroll-size nil)
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(make-local-variable 'view-last-regexp)
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(setq view-last-regexp nil)
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(beginning-of-line)
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(setq goal-column nil)
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(use-local-map view-mode-map)
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(run-hooks 'view-hook)
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(view-helpful-message))
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(defun view-exit ()
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"Exit from view-mode.
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If you viewed an existing buffer, that buffer returns to its previous mode.
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If you viewed a file that was not present in Emacs, its buffer is killed."
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(interactive)
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(setq mode-line-buffer-identification
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view-old-mode-line-buffer-identification)
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(setq major-mode view-old-major-mode)
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(setq mode-name view-old-mode-name)
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(use-local-map (current-local-map))
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(setq buffer-read-only view-old-buffer-read-only)
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(goto-char view-exit-position)
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(set-marker view-exit-position nil)
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;; Now do something to the buffer that we were viewing
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;; (such as kill it).
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(let ((viewed-buffer (current-buffer))
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(action view-exit-action))
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(switch-to-buffer view-prev-buffer)
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(if action (funcall action viewed-buffer))))
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(defun view-helpful-message ()
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(message
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(if (and (eq (key-binding "\C-h") 'Helper-help)
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(eq (key-binding "?") 'Helper-describe-bindings)
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(eq (key-binding "\C-c") 'view-exit))
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"Type C-h for help, ? for commands, C-c to quit"
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(substitute-command-keys
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"Type \\[Helper-help] for help, \\[Helper-describe-bindings] for commands, \\[exit-recursive-edit] to quit."))))
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(defun View-undefined ()
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(interactive)
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(ding)
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(view-helpful-message))
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(defun view-window-size () (1- (window-height)))
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(defun view-scroll-size ()
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(min (view-window-size) (or view-scroll-size (view-window-size))))
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(defvar view-hook nil
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"If non-nil, its value is called when viewing buffer or file.")
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;(defun view-last-command (&optional who what)
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; (setq view-last-command-entry this-command)
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; (setq view-last-command who)
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; (setq view-last-command-argument what))
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;(defun View-repeat-last-command ()
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; "Repeat last command issued in View mode."
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; (interactive)
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; (if (and view-last-command
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; (eq view-last-command-entry last-command))
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; (funcall view-last-command view-last-command-argument))
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; (setq this-command view-last-command-entry))
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(defun View-goto-line (&optional line)
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"Move to LINE in View mode.
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Display is centered at LINE. Sets mark at starting position and pushes
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mark ring."
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(interactive "p")
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(push-mark)
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(goto-line (or line 1))
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(recenter (/ (view-window-size) 2)))
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(defun View-scroll-lines-forward (&optional lines)
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"Scroll forward in View mode, or exit if end of text is visible.
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No arg means whole window full, or number of lines set by \\[View-scroll-lines-forward-set-scroll-size].
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Arg is number of lines to scroll."
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(interactive "P")
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(if (pos-visible-in-window-p (point-max))
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(exit-recursive-edit))
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(setq lines
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(if lines (prefix-numeric-value lines)
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(view-scroll-size)))
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; (view-last-command 'View-scroll-lines-forward lines)
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(if (>= lines (view-window-size))
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(scroll-up nil)
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(if (>= (- lines) (view-window-size))
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(scroll-down nil)
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(scroll-up lines)))
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(cond ((pos-visible-in-window-p (point-max))
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(goto-char (point-max))
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(recenter -1)
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(message (substitute-command-keys
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"End. Type \\[exit-recursive-edit] to quit viewing."))))
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(move-to-window-line -1)
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(beginning-of-line))
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(defun View-scroll-lines-forward-set-scroll-size (&optional lines)
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"Scroll forward LINES lines in View mode, setting the \"scroll size\".
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This is the number of lines which \\[View-scroll-lines-forward] and \\[View-scroll-lines-backward] scroll by default.
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The absolute value of LINES is used, so this command can be used to scroll
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backwards (but \"scroll size\" is always positive). If LINES is greater than
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window height or omitted, then window height is assumed. If LINES is less
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than window height then scrolling context is provided from previous screen."
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(interactive "P")
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(if (not lines)
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(setq view-scroll-size (view-window-size))
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(setq lines (prefix-numeric-value lines))
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(setq view-scroll-size
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(min (if (> lines 0) lines (- lines)) (view-window-size))))
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(View-scroll-lines-forward lines))
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(defun View-scroll-one-more-line (&optional arg)
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"Scroll one more line up in View mode.
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With ARG scroll one line down."
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(interactive "P")
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(View-scroll-lines-forward (if (not arg) 1 -1)))
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(defun View-scroll-lines-backward (&optional lines)
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"Scroll backward in View mode.
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No arg means whole window full, or number of lines set by \\[View-scroll-lines-forward-set-scroll-size].
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Arg is number of lines to scroll."
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(interactive "P")
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(View-scroll-lines-forward (if lines
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(- (prefix-numeric-value lines))
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(- (view-scroll-size)))))
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(defun View-search-regexp-forward (times regexp)
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"Search forward for NTH occurrence of REGEXP in View mode.
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Displays line found at center of window. REGEXP is remembered for
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searching with \\[View-search-last-regexp-forward] and \\[View-search-last-regexp-backward]. Sets mark at starting position and pushes mark ring."
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(interactive "p\nsSearch forward (regexp): ")
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(if (> (length regexp) 0)
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(progn
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;(view-last-command 'View-search-last-regexp-forward times)
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(view-search times regexp))))
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(defun View-search-regexp-backward (times regexp)
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"Search backward from window start for NTH instance of REGEXP in View mode.
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Displays line found at center of window. REGEXP is remembered for
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searching with \\[View-search-last-regexp-forward] and \\[View-search-last-regexp-backward]. Sets mark at starting position and pushes mark ring."
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(interactive "p\nsSearch backward (regexp): ")
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(View-search-regexp-forward (- times) regexp))
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(defun View-search-last-regexp-forward (times)
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"Search forward from window end for NTH instance of last regexp in View mode.
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Displays line found at center of window. Sets mark at starting position
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and pushes mark ring."
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(interactive "p")
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(View-search-regexp-forward times view-last-regexp))
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(defun View-search-last-regexp-backward (times)
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"Search backward from window start for NTH instance of last regexp in View mode.
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Displays line found at center of window. Sets mark at starting position and
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pushes mark ring."
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(interactive "p")
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(View-search-regexp-backward times view-last-regexp))
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(defun View-back-to-mark (&optional ignore)
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"Return to last mark set in View mode, else beginning of file.
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Displays line at center of window. Pops mark ring so successive
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invocations return to earlier marks."
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(interactive)
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(goto-char (or (mark) (point-min)))
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(pop-mark)
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(recenter (/ (view-window-size) 2)))
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(defun view-search (times regexp)
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(setq view-last-regexp regexp)
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(let (where)
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(save-excursion
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(move-to-window-line (if (< times 0) 0 -1))
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(if (re-search-forward regexp nil t times)
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(setq where (point))))
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(if where
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(progn
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(push-mark)
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(goto-char where)
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(beginning-of-line)
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(recenter (/ (view-window-size) 2)))
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(message "Can't find occurrence %d of %s" times regexp)
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(sit-for 4))))
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