-;;; view.el --- peruse file or buffer without editing.
+;;; view.el --- peruse file or buffer without editing
-;; Copyright (C) 1985, 1989, 1994, 1995, 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1989, 1994, 1995, 1997, 2000, 2001, 2002,
+;; 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
;; Author: K. Shane Hartman
;; Maintainer: Inge Frick <inge@nada.kth.se>
+;; Keywords: files
;; This file is part of GNU Emacs.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;
;; You could also bind view-file, view-buffer, view-buffer-other-window and
;; view-buffer-other-frame to keys.
-
+\f
;;; Code:
(defgroup view nil
:group 'wp
:group 'editing)
-(defcustom view-read-only nil
- "*Non-nil means buffers visiting files read-only, do it in view mode."
- :type 'boolean
- :group 'view)
-
(defcustom view-highlight-face 'highlight
"*The face used for highlighting the match found by View mode search."
:type 'face
:type 'boolean
:group 'view)
+(defcustom view-inhibit-help-message nil
+ "*Non-nil inhibits the help message showed upon entering View mode."
+ :type 'boolean
+ :group 'view
+ :version "22.1")
+
;;;###autoload
(defvar view-mode nil
"Non-nil if View mode is enabled.
"Normal hook run when starting to view a buffer or file."
:type 'hook
:group 'view)
-
+\f
(defvar view-old-buffer-read-only nil)
(make-variable-buffer-local 'view-old-buffer-read-only)
(defvar view-old-Helper-return-blurb)
(make-variable-buffer-local 'view-old-Helper-return-blurb)
+;; Just to avoid warnings.
+(defvar Helper-return-blurb)
+
(defvar view-page-size nil
"Default number of lines to scroll by View page commands.
-If nil then the local value of this is initially set to window size.")
+If nil that means use the window size.")
(make-variable-buffer-local 'view-page-size)
(defvar view-half-page-size nil
"Default number of lines to scroll by View half page commands.
-If nil then the local value of this is initially set to half window size.")
+If nil that means use half the window size.")
(make-variable-buffer-local 'view-half-page-size)
(defvar view-last-regexp nil)
See RETURN-TO-ALIST argument of function `view-mode-exit' for the format of
`view-return-to-alist'.")
(make-variable-buffer-local 'view-return-to-alist)
+(put 'view-return-to-alist 'permanent-local t)
(defvar view-exit-action nil
"nil or a function with one argument (a buffer) called when finished viewing.
This is local in each buffer, once it is used.")
(make-variable-buffer-local 'view-overlay)
-(or (assq 'view-mode minor-mode-alist)
- (setq minor-mode-alist
- (cons '(view-mode " View") minor-mode-alist)))
-
+(unless (assq 'view-mode minor-mode-alist)
+ (setq minor-mode-alist
+ (cons (list 'view-mode
+ (propertize " View"
+ 'local-map mode-line-minor-mode-keymap
+ 'help-echo "mouse-3: minor mode menu"))
+ minor-mode-alist)))
+\f
;; Define keymap inside defvar to make it easier to load changes.
;; Some redundant "less"-like key bindings below have been commented out.
(defvar view-mode-map
(define-key map "m" 'point-to-register)
(define-key map "'" 'register-to-point)
(define-key map "x" 'exchange-point-and-mark)
- (define-key map "@" 'View-back-to-mark)
+ (define-key map "@" 'View-back-to-mark)
(define-key map "." 'set-mark-command)
(define-key map "%" 'View-goto-percent)
; (define-key map "G" 'View-goto-line-last)
(define-key map "1" 'digit-argument)
(define-key map "0" 'digit-argument)
(define-key map "H" 'describe-mode)
- (define-key map "?" 'describe-mode) ; Maybe do as less instead?
+ (define-key map "?" 'describe-mode) ; Maybe do as less instead? See above.
(define-key map "h" 'describe-mode)
map))
(or (assq 'view-mode minor-mode-map-alist)
(setq minor-mode-map-alist
(cons (cons 'view-mode view-mode-map) minor-mode-map-alist)))
-
+\f
;;; Commands that enter or exit view mode.
;;;###autoload
-(defun view-file (file-name)
+(defun view-file (file)
"View FILE in View mode, returning to previous buffer when done.
Emacs commands editing the buffer contents are not available; instead,
a special set of commands (mostly letters and punctuation)
This command runs the normal hook `view-mode-hook'."
(interactive "fView file: ")
- (let ((had-a-buf (get-file-buffer file-name)))
- (view-buffer (find-file-noselect file-name)
- (and (not had-a-buf) 'kill-buffer))))
+ (unless (file-exists-p file) (error "%s does not exist" file))
+ (let ((had-a-buf (get-file-buffer file))
+ (buffer (find-file-noselect file)))
+ (if (eq (with-current-buffer buffer
+ (get major-mode 'mode-class))
+ 'special)
+ (progn
+ (switch-to-buffer buffer)
+ (message "Not using View mode because the major mode is special"))
+ (view-buffer buffer (and (not had-a-buf) 'kill-buffer)))))
;;;###autoload
-(defun view-file-other-window (file-name)
+(defun view-file-other-window (file)
"View FILE in View mode in another window.
Return that window to its previous buffer when done.
Emacs commands editing the buffer contents are not available; instead,
This command runs the normal hook `view-mode-hook'."
(interactive "fIn other window view file: ")
- (let ((had-a-buf (get-file-buffer file-name)))
- (view-buffer-other-window (find-file-noselect file-name) nil
+ (unless (file-exists-p file) (error "%s does not exist" file))
+ (let ((had-a-buf (get-file-buffer file)))
+ (view-buffer-other-window (find-file-noselect file) nil
(and (not had-a-buf) 'kill-buffer))))
;;;###autoload
-(defun view-file-other-frame (file-name)
+(defun view-file-other-frame (file)
"View FILE in View mode in another frame.
Maybe delete other frame and/or return to previous buffer when done.
Emacs commands editing the buffer contents are not available; instead,
This command runs the normal hook `view-mode-hook'."
(interactive "fIn other frame view file: ")
- (let ((had-a-buf (get-file-buffer file-name)))
- (view-buffer-other-frame (find-file-noselect file-name) nil
+ (unless (file-exists-p file) (error "%s does not exist" file))
+ (let ((had-a-buf (get-file-buffer file)))
+ (view-buffer-other-frame (find-file-noselect file) nil
(and (not had-a-buf) 'kill-buffer))))
;;;###autoload
-(defun view-buffer (buffer-name &optional exit-action)
+(defun view-buffer (buffer &optional exit-action)
"View BUFFER in View mode, returning to previous buffer when done.
Emacs commands editing the buffer contents are not available; instead,
a special set of commands (mostly letters and punctuation)
(interactive "bView buffer: ")
(let ((undo-window (list (window-buffer) (window-start) (window-point))))
- (switch-to-buffer buffer-name)
+ (switch-to-buffer buffer)
(view-mode-enter (cons (selected-window) (cons nil undo-window))
exit-action)))
;;;###autoload
-(defun view-buffer-other-window
- (buffer-name &optional not-return exit-action)
+(defun view-buffer-other-window (buffer &optional not-return exit-action)
"View BUFFER in View mode in another window.
Return to previous buffer when done, unless optional NOT-RETURN is non-nil.
Emacs commands editing the buffer contents are not available; instead,
(cons (selected-window)
(if (eq win (selected-window))
t ; Has to make new window.
- (list
+ (list
(window-buffer win) ; Other windows old buffer.
(window-start win)
(window-point win)))))))
- (switch-to-buffer-other-window buffer-name)
+ (switch-to-buffer-other-window buffer)
(view-mode-enter (and return-to (cons (selected-window) return-to))
exit-action)))
;;;###autoload
-(defun view-buffer-other-frame
- (buffer-name &optional not-return exit-action)
+(defun view-buffer-other-frame (buffer &optional not-return exit-action)
"View BUFFER in View mode in another frame.
Return to previous buffer when done, unless optional NOT-RETURN is non-nil.
Emacs commands editing the buffer contents are not available; instead,
(interactive "bView buffer in other frame: \nP")
(let ((return-to
(and (not not-return) (cons (selected-window) t)))) ; Old window.
- (switch-to-buffer-other-frame buffer-name)
+ (switch-to-buffer-other-frame buffer)
(view-mode-enter (and return-to (cons (selected-window) return-to))
exit-action)))
-
+\f
;;;###autoload
(defun view-mode (&optional arg)
;; In the following documentation string we have to use some explicit key
;; bindings instead of using the \\[] construction. The reason for this
;; is that most commands have more than one key binding.
"Toggle View mode, a minor mode for viewing text but not editing it.
-With arg, turn View mode on iff arg is positive.
+With ARG, turn View mode on iff ARG is positive.
Emacs commands that do not change the buffer contents are available as usual.
Kill commands insert text in kill buffers but do not delete. Other commands
\\[beginning-of-buffer] move to the beginning of buffer.
> move to the end of buffer.
\\[View-scroll-to-buffer-end] scroll so that buffer end is at last line of window.
-SPC scroll forward prefix (default \"page size\") lines.
-DEL scroll backward prefix (default \"page size\") lines.
-\\[View-scroll-page-forward-set-page-size] like \\[View-scroll-page-forward] except prefix sets \"page size\".
-\\[View-scroll-page-backward-set-page-size] like \\[View-scroll-page-backward] except prefix sets \"page size\".
-\\[View-scroll-half-page-forward] scroll forward (and if prefix set) \"half page size\" lines.
-\\[View-scroll-half-page-backward] scroll backward (and if prefix set) \"half page size\" lines.
-RET, LFD scroll forward prefix (default one) line(s).
-y scroll backward prefix (default one) line(s).
+SPC scroll forward \"page size\" lines.
+ With prefix scroll forward prefix lines.
+DEL scroll backward \"page size\" lines.
+ With prefix scroll backward prefix lines.
+\\[View-scroll-page-forward-set-page-size] like \\[View-scroll-page-forward] but with prefix sets \"page size\" to prefix.
+\\[View-scroll-page-backward-set-page-size] like \\[View-scroll-page-backward] but with prefix sets \"page size\" to prefix.
+\\[View-scroll-half-page-forward] scroll forward \"half page size\" lines. With prefix, sets
+ \"half page size\" to prefix lines and scrolls forward that much.
+\\[View-scroll-half-page-backward] scroll backward \"half page size\" lines. With prefix, sets
+ \"half page size\" to prefix lines and scrolls backward that much.
+RET, LFD scroll forward one line. With prefix scroll forward prefix line(s).
+y scroll backward one line. With prefix scroll backward prefix line(s).
\\[View-revert-buffer-scroll-page-forward] revert-buffer if necessary and scroll forward.
Use this to view a changing file.
\\[what-line] prints the current line number.
\\ searches backward for regular expression, starting before current page.
\\[View-search-last-regexp-forward] searches forward for last regular expression.
p searches backward for last regular expression.
-\\[View-quit] quit View mode, trying to restore window and buffer to previous state.
+\\[View-quit] quit View mode, restoring this window and buffer to previous state.
\\[View-quit] is the normal way to leave view mode.
\\[View-exit] exit View mode but stay in current buffer. Use this if you started
viewing a buffer (file) and find out you want to edit it.
-\\[View-exit-and-edit] exit View mode and make the current buffer editable.
-\\[View-quit-all] quit View mode, trying to restore windows and buffer to previous state.
+ This command restores the previous read-only status of the buffer.
+\\[View-exit-and-edit] exit View mode, and make the current buffer editable
+ even if it was not editable before entry to View mode.
+\\[View-quit-all] quit View mode, restoring all windows to previous state.
\\[View-leave] quit View mode and maybe switch buffers, but don't kill this buffer.
\\[View-kill-and-leave] quit View mode, kill current buffer and go back to other buffer.
The effect of \\[View-leave] , \\[View-quit] and \\[View-kill-and-leave] depends on how view-mode was entered. If it was
-entered by view-file, view-file-other-window or view-file-other-frame (\\[view-file],
-\\[view-file-other-window], \\[view-file-other-frame] or the dired mode v command), then \\[View-quit] will try to kill the
-current buffer. If view-mode was entered from another buffer as is done by
-View-buffer, View-buffer-other-window, View-buffer-other frame, View-file,
-View-file-other-window or View-file-other-frame then \\[view-leave] , \\[view-quit] and \\[view-kill-and-leave] will return
-to that buffer.
+entered by view-file, view-file-other-window, view-file-other-frame, or
+\\[dired-view-file] \(\\[view-file], \\[view-file-other-window],
+\\[view-file-other-frame], or the Dired mode v command),
+then \\[View-quit] will try to kill the current buffer.
+If view-mode was entered from another buffer, by \\[view-buffer],
+\\[view-buffer-other-window], \\[view-buffer-other frame], \\[view-file],
+\\[view-file-other-window], or \\[view-file-other-frame],
+then \\[View-leave] , \\[View-quit] and \\[View-kill-and-leave] will return to that buffer.
Entry to view-mode runs the normal hook `view-mode-hook'."
(interactive "P")
(if (> (prefix-numeric-value arg) 0) view-mode (not view-mode)))
(if view-mode (view-mode-disable)
(view-mode-enable))))
-
+\f
(defun view-mode-enable ()
"Turn on View mode."
;; Always leave view mode before changing major mode.
;; This is to guarantee that the buffer-read-only variable is restored.
- (make-local-hook 'change-major-mode-hook)
(add-hook 'change-major-mode-hook 'view-mode-disable nil t)
(setq view-mode t
- view-page-size (view-page-size-default view-page-size)
- view-half-page-size (or view-half-page-size (/ (view-window-size) 2))
+ view-page-size nil
+ view-half-page-size nil
view-old-buffer-read-only buffer-read-only
buffer-read-only t
view-old-Helper-return-blurb (and (boundp 'Helper-return-blurb)
(if (buffer-file-name)
(file-name-nondirectory (buffer-file-name))
(buffer-name))))
+ (force-mode-line-update)
(run-hooks 'view-mode-hook))
(defun view-mode-disable ()
"Turn off View mode."
(remove-hook 'change-major-mode-hook 'view-mode-disable t)
(and view-overlay (delete-overlay view-overlay))
+ (force-mode-line-update)
+ ;; Calling toggle-read-only while View mode is enabled
+ ;; sets view-read-only to t as a buffer-local variable
+ ;; after exiting View mode. That arranges that the next toggle-read-only
+ ;; will reenable View mode.
+ ;; Cancelling View mode in any other way should cancel that, too,
+ ;; so that View mode stays off if toggle-read-only is called.
+ (if (local-variable-p 'view-read-only)
+ (kill-local-variable 'view-read-only))
(setq view-mode nil
- Helper-return-blurb view-old-Helper-return-blurb
- buffer-read-only view-old-buffer-read-only))
+ Helper-return-blurb view-old-Helper-return-blurb)
+ (if buffer-read-only
+ (setq buffer-read-only view-old-buffer-read-only)))
;;;###autoload
(defun view-mode-enter (&optional return-to exit-action) "\
Enter View mode and set up exit from view mode depending on optional arguments.
If RETURN-TO is non-nil it is added as an element to the buffer local alist
-view-return-to-alist.
+`view-return-to-alist'.
Save EXIT-ACTION in buffer local variable `view-exit-action'.
It should be either nil or a function that takes a buffer as argument.
This function will be called by `view-mode-exit'.
2) t Delete WINDOW or, if it is the only window, its frame.
3) (OLD-BUFF START POINT) Display buffer OLD-BUFF with displayed text
starting at START and point at POINT in WINDOW.
-4) quit-window Do quit-window in WINDOW.
+4) quit-window Do `quit-window' in WINDOW.
For list of all View commands, type H or h while viewing.
(unless view-mode ; Do nothing if already in view mode.
(view-mode-enable)
(force-mode-line-update)
- (message "%s"
- (substitute-command-keys "\
-Type \\[help-command] for help, \\[describe-mode] for commands, \\[View-quit] to quit."))))
-
+ (unless view-inhibit-help-message
+ (message "%s"
+ (substitute-command-keys "\
+View mode: type \\[help-command] for help, \\[describe-mode] for commands, \\[View-quit] to quit.")))))
+\f
(defun view-mode-exit (&optional return-to-alist exit-action all-win)
- "Exit view-mode in various ways, depending on optional arguments.
+ "Exit View mode in various ways, depending on optional arguments.
RETURN-TO-ALIST, EXIT-ACTION and ALL-WIN determine what to do after exit.
EXIT-ACTION is nil or a function that is called with current buffer as
argument.
OLD-WINDOW is nil or a window to select after viewing.
OLD-BUF-INFO is information on what to do with WINDOW and is one of:
1) nil Do nothing.
-2) t Delete WINDOW or, if it is the only window, its frame.
+2) t Delete WINDOW and, if it is the only window, its frame.
3) (OLD-BUF START POINT) Display buffer OLD-BUF with displayed text
starting at START and point at POINT in WINDOW.
-4) quit-window Do quit-window in WINDOW.
+4) quit-window Do `quit-window' in WINDOW.
If one of the WINDOW in RETURN-TO-ALIST is the selected window and the
corresponding OLD-WINDOW is a live window, then select OLD-WINDOW."
(and return-to-alist (or all-win view-exits-all-viewing-windows)))
(if view-mode ; Only do something if in view mode.
(let* ((buffer (current-buffer))
- window
+ window notlost
(sel-old (assq (selected-window) return-to-alist))
(alist (cond
(all-win ; Try to restore all windows.
(or view-no-disable-on-exit
(view-mode-disable))
(while alist ; Restore windows with info.
+ (setq notlost nil)
(if (and (window-live-p (setq window (car (car alist))))
(eq buffer (window-buffer window)))
(let ((frame (window-frame window))
(set-window-start window (car (cdr old-buf-info)))
(set-window-point window (car (cdr (cdr old-buf-info)))))
((eq old-buf-info 'quit-window)
- (quit-window)) ; Not case 2, do nothing.
+ (quit-window)) ; Case 4.
((not (eq old-buf-info t)) nil) ; Not case 2, do nothing.
((not (one-window-p t)) (delete-window))
((not (eq frame (next-frame)))
;; Not the only frame, so can safely be removed.
(if view-remove-frame-by-deleting
(delete-frame frame)
+ (setq notlost t) ; Keep the window. See below.
(iconify-frame frame))))))
- (setq view-return-to-alist (delete (car alist) view-return-to-alist))
+ ;; If a frame is removed by iconifying it, then the window is not
+ ;; really lost. In this case we keep the entry in
+ ;; view-return-to-alist so that if the user deiconifies the frame
+ ;; and then press q, then the frame is iconified again.
+ (unless notlost
+ (setq view-return-to-alist
+ (delete (car alist) view-return-to-alist)))
(setq alist (cdr alist)))
(if (window-live-p old-window) ; still existing window
(select-window old-window))
(setq view-exit-action nil)
(funcall exit-action buffer))
(force-mode-line-update))))
-
+\f
(defun View-exit ()
"Exit View mode but stay in current buffer."
(interactive)
(defun View-exit-and-edit ()
"Exit View mode and make the current buffer editable."
(interactive)
- (let ((view-old-buffer-read-only nil))
+ (let ((view-old-buffer-read-only nil)
+ (view-no-disable-on-exit nil))
(view-mode-exit)))
(defun View-leave ()
"Quit View mode, kill current buffer and return to previous buffer."
(interactive)
(view-mode-exit view-return-to-alist (or view-exit-action 'kill-buffer) t))
-
+\f
;;; Some help routines.
(defun view-set-half-page-size-default (lines)
;; Get and maybe set half page size.
- (if (not lines) view-half-page-size
+ (if (not lines) (or view-half-page-size
+ (/ (view-window-size) 2))
(setq view-half-page-size
(if (zerop (setq lines (prefix-numeric-value lines)))
(/ (view-window-size) 2)
; (goto-char (point-max))
; (beginning-of-line))
; (view-recenter))
-
+
(defun View-goto-line (&optional line)
"Move to first (or prefix LINE) line in View mode.
Display is centered at LINE.
(goto-line line)
(view-recenter))
-(defun View-scroll-to-buffer-end ()
- "Scroll backward or forward so that buffer end is at last line of window."
+(defun View-back-to-mark (&optional ignore)
+ "Return to last mark set in View mode, else beginning of file.
+Display that line at the center of the window.
+This command pops the mark ring, so that successive
+invocations return to earlier marks."
(interactive)
- (let ((p (if (pos-visible-in-window-p (point-max)) (point))))
- (goto-char (point-max))
- (recenter -1)
- (and p (goto-char p))))
-
+ (goto-char (or (mark t) (point-min)))
+ (pop-mark)
+ (view-recenter))
+\f
(defun view-scroll-lines (lines backward default maxdefault)
;; This function does the job for all the scrolling commands.
;; Scroll forward LINES lines. If BACKWARD is true scroll backwards.
(if view-scroll-auto-exit "\\[View-scroll-page-forward]"
"\\[View-quit]")))
(message "End of buffer")))
+\f
+(defun View-scroll-to-buffer-end ()
+ "Scroll backward or forward so that buffer end is at last line of window."
+ (interactive)
+ (let ((p (if (pos-visible-in-window-p (point-max)) (point))))
+ (goto-char (point-max))
+ (recenter -1)
+ (and p (goto-char p))))
(defun View-scroll-page-forward (&optional lines)
"Scroll \"page size\" or prefix LINES lines forward in View mode.
\\[View-scroll-page-backward-set-page-size].
If LINES is more than a window-full, only the last window-full is shown."
(interactive "P")
- (view-scroll-lines lines nil view-page-size nil))
+ (view-scroll-lines lines nil (view-page-size-default view-page-size) nil))
-(defun View-scroll-page-backward (&optional lines)
+(defun View-scroll-page-backward (&optional lines)
"Scroll \"page size\" or prefix LINES lines backward in View mode.
See also `View-scroll-page-forward'."
(interactive "P")
- (view-scroll-lines lines t view-page-size nil))
-
+ (view-scroll-lines lines t (view-page-size-default view-page-size) nil))
+
(defun View-scroll-page-forward-set-page-size (&optional lines)
"Scroll forward LINES lines in View mode, setting the \"page size\".
This is the number of lines which \\[View-scroll-page-forward] and
\\[View-scroll-page-backward-set-page-size].
If LINES is more than a window-full, only the last window-full is shown."
(interactive "P")
- (let ((view-mode-auto-exit nil)
+ (let ((view-scroll-auto-exit nil)
(view-try-extend-at-buffer-end t))
- (view-scroll-lines lines nil view-page-size nil)))
-
-(defun View-back-to-mark (&optional ignore)
- "Return to last mark set in View mode, else beginning of file.
-Display that line at the center of the window.
-This command pops the mark ring, so that successive
-invocations return to earlier marks."
- (interactive)
- (goto-char (or (mark t) (point-min)))
- (pop-mark)
- (view-recenter))
-
+ (view-scroll-lines lines nil (view-page-size-default view-page-size) nil)))
+\f
(defun View-search-regexp-forward (n regexp)
"Search forward for first (or prefix Nth) occurrence of REGEXP in View mode.
The variable `view-highlight-face' controls the face that is used
for highlighting the match that is found."
- (interactive "p\nsSearch forward (regexp): ")
+ (interactive "p\nsSearch forward (regexp): ")
(view-search n regexp))
(defun View-search-regexp-backward (n regexp)
(provide 'view)
+;;; arch-tag: 6d0ace36-1d12-4de3-8de3-1fa3231636d7
;;; view.el ends here