xemacs-beta: lisp/view-less.el comparison

comparison lisp/view-less.el @ 217:d44af0c54775 r20-4b7

Import from CVS: tag r20-4b7

author	cvs
date	Mon, 13 Aug 2007 10:08:34 +0200
parents
children	8bec6624d99b

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-:43306a74e31c
+:d44af0c54775
+;;; view-less.el --- Minor mode for browsing files with keybindings like `less'
+;; Copyright (C) 1994, 1995 Tinker Systems and INS Engineering Corp.
+;; Author: Jonathan Stigelman <stig@hackvan.com>
+;; Maintainer: XEmacs Development Team
+;; Keywords: wp, unix
+;; This file is part of XEmacs.
+;;
+;; XEmacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2 of the License, or
+;; (at your option) any later version.
+;;
+;; XEmacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with XEmacs; if not, write to the Free Software
+;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+;;; Synched up with: Not in FSF.
+;;; Commentary:
+;; This mode is for browsing files without changing them.  Keybindings
+;; similar to those used by the less(1) program are used.
+;;
+;; Originally written for v18 by David Gudeman (gudeman@arizona.edu)
+;; Mods by Bengt Martensson, to closely resemble less (July 1987)
+;;
+;; If you would like all write-protected files to be visited in view-mode,
+;; then add the following to your .emacs file:
+;;
+;;      (add-hook 'find-file-hooks 'auto-view-mode)
+;;; Code:
+(defvar view-search-string ""
+"Last string searched for with view-search functions.")
+(defvar view-search-arg 1
+"Argument to last view search.")
+(defvar view-default-lines 10
+"Default value for the \"d\" and \"u\" commands in view-mode")
+(defvar view-minor-mode nil
+"Non-nil when view-mode is active.  Call `view-mode' to toggle.")
+(make-variable-buffer-local 'view-minor-mode)
+;;;###autoload
+(defvar view-minor-mode-map
+(let ((map (make-keymap)))
+(set-keymap-name map 'view-minor-mode-map)
+(suppress-keymap map)
+(define-key map "-" 'negative-argument)
+(define-key map " " 'scroll-up)
+(define-key map "f" 'scroll-up)
+(define-key map "b" 'scroll-down)
+(define-key map 'backspace 'scroll-down)
+(define-key map 'delete 'scroll-down)
+(define-key map "\r" 'view-scroll-lines-up)
+(define-key map "\n" 'view-scroll-lines-up)
+(define-key map "e" 'view-scroll-lines-up)
+(define-key map "j" 'view-scroll-lines-up)
+(define-key map "y" 'view-scroll-lines-down)
+(define-key map "k" 'view-scroll-lines-down)
+(define-key map "d" 'view-scroll-some-lines-up)
+(define-key map "u" 'view-scroll-some-lines-down)
+(define-key map "r" 'recenter)
+(define-key map "t" 'toggle-truncate-lines)
+(define-key map "N" 'view-buffer)
+(define-key map "E" 'view-file)
+(define-key map "P" 'view-buffer)
+(define-key map "!" 'shell-command)
+(define-key map "|" 'shell-command-on-region)
+(define-key map "=" 'what-line)
+(define-key map "?" 'view-search-backward)
+(define-key map "h" 'view-mode-describe)
+(define-key map "s" 'view-repeat-search)
+(define-key map "n" 'view-repeat-search)
+(define-key map "/" 'view-search-forward)
+(define-key map "\\" 'view-search-backward)
+(define-key map "g" 'view-goto-line)
+(define-key map "G" 'view-last-windowful)
+(define-key map "%" 'view-goto-percent)
+(define-key map "p" 'view-goto-percent)
+(define-key map "m" 'point-to-register)
+(define-key map "'" 'register-to-point)
+(define-key map "C" 'view-cleanup-backspaces)
+(define-key map "\C-c\C-c" 'view-quit)
+;; #### - should this use substitute-command-keys?
+(define-key map "\C-x\C-q" 'view-quit-toggle-ro)
+(define-key map "q" 'view-quit)
+map
+))
+(add-minor-mode 'view-minor-mode " View" view-minor-mode-map)
+;;;###autoload
+(defvar view-mode-map
+(let ((map (copy-keymap view-minor-mode-map)))
+(set-keymap-name map 'view-mode-map)
+map))
+;;;###autoload
+(defun view-file (file &optional other-p)
+"Find FILE, enter view mode.  With prefix arg OTHER-P, use other window."
+(interactive "fView File: \nP")
+(let ((old-p (get-file-buffer file))
+	(obuf (current-buffer)))
+(if other-p
+	(find-file-other-window file)
+(find-file file))
+(view-mode (if other-p nil obuf)
+	       (if old-p nil 'kill-buffer))
+nil))
+;;;###autoload
+(defun view-buffer (buf &optional other-p)
+"Switch to BUF, enter view mode.  With prefix arg use other window."
+(interactive "bView Buffer: \nP")
+(let ((obuf (current-buffer)))
+(if other-p
+	(switch-to-buffer-other-window buf)
+(switch-to-buffer buf))
+(view-mode (if other-p nil obuf) (if other-p nil 'bury-buffer))))
+;;;###autoload
+(defun view-file-other-window (file)
+"Find FILE in other window, and enter view mode."
+(interactive "fView File: ")
+(view-file file t))
+;;;###autoload
+(defun view-buffer-other-window (buffer)
+"Switch to BUFFER in another window, and enter view mode."
+(interactive "bView Buffer: ")
+(view-buffer buffer t))
+(defun view-brief-help ()
+(message
+(substitute-command-keys
+"\\<view-minor-mode-map>\\[scroll-up] = page forward; \\[scroll-down] = page back; \
+\\[view-mode-describe] = help; \\[view-quit] = quit.")))
+(defvar view-exit-position)
+(defvar view-prev-buffer)
+(defvar view-exit-action)
+(defvar view-old-buffer-read-only)
+;;;###autoload
+(defun view-minor-mode (&optional prev-buffer exit-action)
+"Minor mode for viewing text, with bindings like `less'.
+Commands are:
+\\<view-minor-mode-map>
+0..9	prefix args
+-	prefix minus
+\\[scroll-up]	page forward
+\\[scroll-down]	page back
+\\[view-scroll-lines-up]	scroll prefix-arg lines forward, default 1.
+\\[view-scroll-lines-down]	scroll prefix-arg lines backward, default 1.
+\\[view-scroll-some-lines-down]	scroll prefix-arg lines backward, default 10.
+\\[view-scroll-some-lines-up]	scroll prefix-arg lines forward, default 10.
+\\[what-line]	print line number
+\\[view-mode-describe]	print this help message
+\\[view-search-forward]	regexp search, uses previous string if you just hit RET
+\\[view-search-backward]	as above but searches backward
+\\[view-repeat-search]	repeat last search
+\\[view-goto-line]	goto line prefix-arg, default 1
+\\[view-last-windowful]	goto line prefix-arg, default last line
+\\[view-goto-percent]	goto a position by percentage
+\\[toggle-truncate-lines]	toggle truncate-lines
+\\[view-file]	view another file
+\\[view-buffer]	view another buffer
+\\[view-cleanup-backspaces]	cleanup backspace constructions
+\\[shell-command]	execute a shell command
+\\[shell-command-on-region]\
+	execute a shell command with the region as input
+\\[view-quit]	exit view-mode, and bury the current buffer.
+If invoked with the optional (prefix) arg non-nil, view-mode cleans up
+backspace constructions.
+More precisely:
+\\{view-minor-mode-map}"
+(interactive)
+(make-local-variable 'view-default-lines)
+(set (make-local-variable 'view-exit-position)      (point))
+(set (make-local-variable 'view-prev-buffer)   prev-buffer)
+(set (make-local-variable 'view-exit-action)   exit-action)
+(set (make-local-variable 'view-old-buffer-read-only)     buffer-read-only)
+(add-hook (make-local-variable 'change-major-mode-hook)
+	    'view-fixup-read-only)
+(setq view-minor-mode  t
+	buffer-read-only t)
+(view-brief-help))
+;;;###autoload
+(defun view-mode (&optional prev-buffer exit-action clean-bs)
+"View the current buffer using view-minor-mode.  This exists to be 99.9%
+compatible with the implementations of `view-mode' in view.el and older
+versions of view-less.el."
+(interactive (list nil 'bury-buffer current-prefix-arg))
+;; #### - The first two arguments provide compatibility with view.el (and
+;; thus FSFmacs), while the third argument as a prefix argument maintains
+;; interactive compatibility with older versions of view-less.  --Stig
+(if clean-bs (cleanup-backspaces))
+(view-minor-mode prev-buffer exit-action))
+;;;###autoload
+(defun view-major-mode (&optional prev-buffer exit-action clean-bs)
+"View the current buffer using view-mode, as a major mode.
+This function has a nonstandard name because `view-mode' is wrongly
+named but is like this for compatibility reasons."
+;; #### - The first two arguments provide compatibility with view.el (and
+;; thus FSFmacs), while the third argument as a prefix argument maintains
+;; interactive compatibility with older versions of view-less.  --Stig
+(interactive (list nil 'bury-buffer current-prefix-arg))
+(kill-all-local-variables)
+(use-local-map view-mode-map)
+(setq major-mode 'view-mode)
+(set (make-local-variable 'view-exit-position)      (point))
+(set (make-local-variable 'view-prev-buffer)   prev-buffer)
+(set (make-local-variable 'view-exit-action)   exit-action)
+(set (make-local-variable 'view-old-buffer-read-only)     buffer-read-only)
+(set (make-local-variable 'view-major-mode) t)
+(setq buffer-read-only t)
+(if clean-bs (cleanup-backspaces))
+(run-hooks 'view-mode-hook))
+;;;###autoload
+(defun auto-view-mode ()
+"If the file of the current buffer is not writable, call view-mode.
+This is meant to be added to `find-file-hooks'."
+(or (file-writable-p buffer-file-name)
+(view-minor-mode)))
+(defun view-fixup-read-only ()
+;; doing M-x normal mode should NOT leave the buffer read-only
+(and (boundp 'view-old-buffer-read-only)
+(progn (setq buffer-read-only view-old-buffer-read-only)
+	      (kill-local-variable 'view-old-buffer-read-only))))
+(defun view-quit-toggle-ro ()
+"Exit view mode and execute the global binding of the key that invoked this
+command.  Normally, this will toggle the state of `buffer-read-only', perhaps
+invoking some version-control mechanism."
+(interactive)
+(setq view-exit-position nil)
+;; Kludge so this works as advertised.  Stig, why can't you write
+;; bug-free code???
+(let ((buffer-read-only buffer-read-only))
+(view-quit t))
+;; no longer in view-minor-mode, so the keymap has changed...
+(call-interactively (key-binding (this-command-keys))))
+(defun view-quit (&optional no-exit-action)
+"Exit view mode.  With prefix argument, keep the current buffer selected."
+(interactive "P")
+(view-fixup-read-only)
+(setq view-minor-mode nil)
+(if view-exit-position (goto-char view-exit-position))
+(if (and (boundp 'view-major-mode) view-major-mode)
+(fundamental-mode)
+(let ((pbuf view-prev-buffer)
+	  (exitact view-exit-action))
+(if no-exit-action
+	  nil
+	(if exitact (funcall exitact (current-buffer)))
+	(if pbuf (switch-to-buffer pbuf))))))
+;; #### - similar to what's in man.el and this ought to be written in C anyway...  --Stig
+(defun cleanup-backspaces ()
+"Cleanup backspace constructions.
+_^H and ^H_ sequences are deleted.  x^Hx sequences are turned into x for all
+characters x.  ^^H| and |^H^ sequences are turned into ^.  +^Ho and o^H+ are
+turned into (+)."
+(interactive)
+(save-excursion
+(goto-char (point-min))
+(while (= (following-char) ?\C-h)
+(delete-char 1))
+(while (search-forward "\C-h" nil t)
+(forward-char -2)
+(cond ((looking-at "_\C-h\\|\\(.\\)\C-h\\1\\||\C-h\\^")
+	     (delete-char 2))
+	    ((looking-at ".\C-h_\\|\\^\C-h|")
+	     (forward-char 1)
+	     (delete-char 2))
+	    ((looking-at "+\C-ho\\|o\C-h+")
+	     (delete-char 3)
+	     (insert "(+)"))
+	    ((looking-at "|\C-h-")
+	     (delete-char 3)
+	     (insert "*"))
+	    (t (forward-char 2))))))
+(defun view-cleanup-backspaces ()
+"Cleanup backspaces and if buffer is currently unmodified, don't flag it
+as a modified buffer.  This works even if the buffer is read-only."
+(interactive)
+(let ((buffer-read-only)
+	(buf-mod (buffer-modified-p)))
+(cleanup-backspaces)
+;; #### - THIS IS PROBABLY A REALLY DANGEROUS THING TO DO IN A MINOR MODE!!
+(set-buffer-modified-p buf-mod)))
+(defun toggle-truncate-lines (&optional p)
+"Toggles the values of truncate-lines.
+Positive prefix arg sets, negative disables."
+(interactive "P")
+(setq truncate-lines (if p
+			   (> (prefix-numeric-value p) 0)
+			 (not truncate-lines)))
+(recenter))
+(defun view-scroll-lines-up (p)
+"Scroll up prefix-arg lines, default 1."
+(interactive "p")
+(scroll-up p))
+(defun view-scroll-lines-down (p)
+"Scroll down prefix-arg lines, default 1."
+(interactive "p")
+(scroll-up (- p)))
+(defun view-scroll-some-lines-down (&optional n)
+"Scroll down prefix-arg lines, default 10, or last argument."
+(interactive "p")
+(if (> n 1) (setq view-default-lines n))
+(scroll-down view-default-lines))
+(defun view-scroll-some-lines-up (&optional n)
+"Scroll up prefix-arg lines, default 10, or last argument."
+(interactive "p")
+(if (> n 1) (setq view-default-lines n))
+(scroll-up view-default-lines))
+(defun view-goto-line (&optional n)
+"Goto prefix arg line N.  N = 1 by default.."
+(interactive "p")
+(goto-line n))
+(defun view-last-windowful (&optional n)
+"Goto prefix arg line N or the first line of the last windowful in buffer."
+(interactive "p")
+(if current-prefix-arg
+(goto-line n)
+(end-of-buffer)
+(recenter -1)
+(move-to-window-line 0)))
+(defun view-goto-percent (&optional percent)
+"Set mark and go to a position PERCENT way into the current buffer."
+(interactive "p")
+(set-mark-command nil)
+(goto-char (+ (point-min) (/ (* percent (- (point-max) (point-min))) 100)))
+(beginning-of-line))
+(defun view-mode-describe ()
+(interactive)
+(let ((mode-name "View")
+	(major-mode 'view-mode))
+(describe-mode)))
+(defun view-search-forward (s p)
+"Search forward for REGEXP.  If regexp is empty, use last search string.
+With prefix ARG, search forward that many occurrences."
+(interactive "sView search: \np")
+(unwind-protect
+(re-search-forward
+(if (string-equal "" s) view-search-string s) nil nil p)
+(setq view-search-arg p)
+(or (string-equal "" s)
+	(setq view-search-string s))))
+(defun view-search-backward (s p)
+"Search backward for REGEXP.  If regexp is empty, use last search string.
+With prefix ARG, search forward that many occurrences."
+(interactive "sView search backward: \np")
+(view-search-forward s (- p)))
+(defun view-repeat-search (p)
+"Repeat last view search command.  If a prefix arg is given, use that
+instead of the previous arg, if the prefix is just a -, then take the
+negative of the last prefix arg."
+(interactive "P")
+(view-search-forward
+view-search-string
+(cond ((null p) view-search-arg)
+	 ((eq p '-) (- view-search-arg))
+	 (t (prefix-numeric-value p)))))
+(provide 'view)
+(provide 'view-less)
+;;; view-less.el ends here

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comparison lisp/view-less.el @ 217:d44af0c54775 r20-4b7