doc-view.el: about cursor and filename display

doc-view.el: about cursor and filename display

[William Xu]

Just began to use doc-view.el, some suggestions: 

1. Hide the cursor

   Cursor in a image buffer looks peculiar, maybe better hide it just
   like image-mode? namely, (setq cursor-type nil)

2. Filename on mode line

   Why not simply display the filename on mode line as usual, like
   `foo.pdf'? At present, the filename on the mode line is very long,
   occupies lots of space of mode line, and is inconvenient to switch to
   by ido, for instance.

3. Add auto-revert-mode support?

-- 
William

http://williamxu.net9.org

  天下皆知美之为美,斯恶已。 皆知善之为善,斯不善已。
   有无相生,难易相成,长短相形 ,高下相盈,音声相和,
前后相随。恒也。
   是以圣人处无为之事, 行不言之教;万物作而弗始,生
而弗有,为而弗恃,功成而不居。夫唯弗居,是以不去。
            ---- 老子第二章

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

William Xu <william.xwl@gmail.com> writes:

Hi William,

> Just began to use doc-view.el, some suggestions:
>
> 1. Hide the cursor
>
>    Cursor in a image buffer looks peculiar, maybe better hide it just
>    like image-mode? namely, (setq cursor-type nil)

But you need the cursor for slicing.  Ok, I could enable it only for
this command.

But what happens with the tooltips if there's no cursor?

> 2. Filename on mode line
>
>    Why not simply display the filename on mode line as usual, like
>    `foo.pdf'? At present, the filename on the mode line is very long,
>    occupies lots of space of mode line, and is inconvenient to switch
>    to by ido, for instance.

My last patch, that makes doc-view the default viewer for pdf/ps/dvi
files uses only the filename.  You can get the patch from my mail
<87r6k2l9sr.fsf_-_@baldur.tsdh.de>.  There you don't use `doc-view'
anymore, but simply find the file using C-x C-f.

> 3. Add auto-revert-mode support?

I don't know if that's a good idea.  a-r-m checks files periodically and
reverts if something changed.  Since "reverting" means reconverting for
doc-view, it's possible that it blows your computer because it may
happen that a new conversion is started before the last one finished
(e.g. every 5 seconds a new conversion is started).

My last patch added a new binding `g' which reconverts the current
document.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[William Xu]

Tassilo Horn <tassilo@member.fsf.org> writes:

> But what happens with the tooltips if there's no cursor?

What kind of tooltips would it show? 

Hmm, it won't work here. (maybe since carbon emacs is broken..)

,----
| Error while displaying tooltip: (wrong-type-argument frame-live-p #<dead frame tooltip 0x62bb190>)
| Page 1 of 4.
`----

> My last patch, that makes doc-view the default viewer for pdf/ps/dvi
> files uses only the filename.  You can get the patch from my mail
> <87r6k2l9sr.fsf_-_@baldur.tsdh.de>.  There you don't use `doc-view'
> anymore, but simply find the file using C-x C-f.

Nice. I wonder why this is not commited into the trunk..

>> 3. Add auto-revert-mode support?
>
> I don't know if that's a good idea.  a-r-m checks files periodically and
> reverts if something changed.  

When i'm generating .pdf from .tex, i thought it would be useful if the
generated .pdf file buffer could be refreshed automatically. 

-- 
William

http://williamxu.net9.org

Re: doc-view.el: about cursor and filename display

[Stefan Monnier]

> I don't know if that's a good idea.  a-r-m checks files periodically and
> reverts if something changed.  Since "reverting" means reconverting for
> doc-view, it's possible that it blows your computer because it may
> happen that a new conversion is started before the last one finished
> (e.g. every 5 seconds a new conversion is started).

That can happen if the user calls revert explicitly as well (yes, less
likely and less severe, but still: the user might do M-x revert-buffer,
then get annoyed that it doesn't see the result, so do it again and again
and again).

It shouldn't be too difficult to protect against it by detecting the
situation and "reacting appropriately".


        Stefan

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

Hi Stefan,

>> I don't know if that's a good idea.  a-r-m checks files periodically
>> and reverts if something changed.  Since "reverting" means
>> reconverting for doc-view, it's possible that it blows your computer
>> because it may happen that a new conversion is started before the
>> last one finished (e.g. every 5 seconds a new conversion is started).
>
> That can happen if the user calls revert explicitly as well (yes, less
> likely and less severe, but still: the user might do M-x
> revert-buffer, then get annoyed that it doesn't see the result, so do
> it again and again and again).
>
> It shouldn't be too difficult to protect against it by detecting the
> situation and "reacting appropriately".

Right.  But I'd like to wait till my last patch is included before I'll
address those (IMO minor) glitches.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

William Xu <william.xwl@gmail.com> writes:

Hi William,

>> But what happens with the tooltips if there's no cursor?
>
> What kind of tooltips would it show?
>
> Hmm, it won't work here. (maybe since carbon emacs is broken..)
>
> ,----
> | Error while displaying tooltip: (wrong-type-argument frame-live-p #<dead frame tooltip 0x62bb190>)
> | Page 1 of 4.
> `----

The second line is what the tooltip should show and it works here.  So
it seems to be a problem with the carbon port.

>> My last patch, that makes doc-view the default viewer for pdf/ps/dvi
>> files uses only the filename.  You can get the patch from my mail
>> <87r6k2l9sr.fsf_-_@baldur.tsdh.de>.  There you don't use `doc-view'
>> anymore, but simply find the file using C-x C-f.
>
> Nice. I wonder why this is not commited into the trunk..

It'll be committed when RMS says so. ;-)

But it'll help if people (YOU!) apply the patch and give feedback if it
works.

>>> 3. Add auto-revert-mode support?
>>
>> I don't know if that's a good idea.  a-r-m checks files periodically
>> and reverts if something changed.
>
> When i'm generating .pdf from .tex, i thought it would be useful if
> the generated .pdf file buffer could be refreshed automatically.

Indeed, this could be useful, but I'll wait till the path makes it into
CVS before addressing new feature requests in order to keep the patch
small and easy to review.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[Richard Stallman]

    >> My last patch, that makes doc-view the default viewer for pdf/ps/dvi
    >> files uses only the filename.  You can get the patch from my mail
    >> <87r6k2l9sr.fsf_-_@baldur.tsdh.de>.  There you don't use `doc-view'
    >> anymore, but simply find the file using C-x C-f.
    >
    > Nice. I wonder why this is not commited into the trunk..

    It'll be committed when RMS says so. ;-)

I am all in favor of that change.

Re: doc-view.el: about cursor and filename display

[Richard Stallman]

    That can happen if the user calls revert explicitly as well (yes, less
    likely and less severe, but still: the user might do M-x revert-buffer,
    then get annoyed that it doesn't see the result, so do it again and again
    and again).

    It shouldn't be too difficult to protect against it by detecting the
    situation and "reacting appropriately".

I don't see how it is possible to detect such a situation.  M-x
revert-buffer could at most detect that input is pending; it cannot
tell what that input will do when executed, so there is really nothing
it can do.

The best solution I know of is to display a message in the echo area
saying that it is reformatting the file.  That way the user could know
to type C-g if he does not want to let it finish.  It would be even better
to print percentage progress messages, but it may be hard for Emacs to
get the information.

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

Richard Stallman <rms@gnu.org> writes:

>     That can happen if the user calls revert explicitly as well (yes,
>     less likely and less severe, but still: the user might do M-x
>     revert-buffer, then get annoyed that it doesn't see the result, so
>     do it again and again and again).
>
>     It shouldn't be too difficult to protect against it by detecting
>     the situation and "reacting appropriately".
>
> I don't see how it is possible to detect such a situation.  M-x
> revert-buffer could at most detect that input is pending; it cannot
> tell what that input will do when executed, so there is really nothing
> it can do.

I'm not completely sure, but the docs lead me to the impression that I
can set `revert-buffer-function' in doc-view buffers to the function
that reconverts a file.  In that function I could check for currently
running processes and revert/reconvert only if no process is already
running.  If there's a conversion process underway, I could inform the
user with a message.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[Richard Stallman]

    I'm not completely sure, but the docs lead me to the impression that I
    can set `revert-buffer-function' in doc-view buffers to the function
    that reconverts a file.  In that function I could check for currently
    running processes and revert/reconvert only if no process is already
    running.

Is the conversion done asynchronously?  If so, then yes you could
easily check this way.  I think the right action is to kill the
existing process and start a new one, because that's what the user
asked for.

You could also indicate in the mode line that the process is running.

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

Richard Stallman <rms@gnu.org> writes:

>     I'm not completely sure, but the docs lead me to the impression
>     that I can set `revert-buffer-function' in doc-view buffers to the
>     function that reconverts a file.  In that function I could check
>     for currently running processes and revert/reconvert only if no
>     process is already running.
>
> Is the conversion done asynchronously?

Yes.

> If so, then yes you could easily check this way.  I think the right
> action is to kill the existing process and start a new one, because
> that's what the user asked for.

Yes, that wouldn't be a problem.

> You could also indicate in the mode line that the process is running.

doc-view indicates with a message and in the tooltip that conversion
hasn't finished yet.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[Stefan Monnier]

>> You could also indicate in the mode line that the process is running.
> doc-view indicates with a message and in the tooltip that conversion
> hasn't finished yet.

I'm not sure I understand what kind of message, when it's displayed, and
where's the tooltip, but Richard is talking about using `mode-line-process',
which is a standard feature and would make a lot of sense here.
A quick grep for it will show you how it's commonly used.


        Stefan

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>> You could also indicate in the mode line that the process is
>>> running.
>>
>> doc-view indicates with a message and in the tooltip that conversion
>> hasn't finished yet.
>
> I'm not sure I understand what kind of message, when it's displayed,
> and where's the tooltip,

While conversion there's a message

  Page 12 of 123. (still converting...)

below the already displayed image to indicate, that the document has
more than 123 pages, but only 123 pages have been converted so far.

> but Richard is talking about using `mode-line-process', which is a
> standard feature and would make a lot of sense here.  A quick grep for
> it will show you how it's commonly used.

Ah, ok.  I didn't know about it and I'll have a look at its usage and
implement that feature.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

[-- Attachment #1: Type: text/plain, Size: 800 bytes --]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> I'm not sure I understand what kind of message, when it's displayed,
> and where's the tooltip, but Richard is talking about using
> `mode-line-process', which is a standard feature and would make a lot
> of sense here.  A quick grep for it will show you how it's commonly
> used.

Ok, here's a new version of my patch.  It includes

  - mode-line-process support: The currently active process is shown in
    the mode line, e.g. dvi->pdf, pdf->txt, pdf/ps->png...

  - revert-buffer support: The current doc will be reconverted

  - When revert-buffer or the reconvert command is called multiple
    times, the old processes will be killed first, so that there's at
    most one process per document/buffer.

  - Some code cleanups

Bye,
Tassilo

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: doc-view.patch --]
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Index: lisp/files.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/files.el,v
retrieving revision 1.932
diff -u -r1.932 files.el
--- lisp/files.el	15 Oct 2007 02:07:46 -0000	1.932
+++ lisp/files.el	17 Oct 2007 19:51:46 -0000
@@ -2059,7 +2059,7 @@
      ("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode)
      ("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode)
      ("\\.\\(dif\\|pat\\)\\'" . diff-mode) ; for MSDOG
-     ("\\.[eE]?[pP][sS]\\'" . ps-mode)
+     ("\\(?:DVI\\|EPS\\|P\\(?:DF\\|S\\)\\|dvi\\|eps\\|p\\(?:df\\|s\\)\\)" . doc-view-mode)
      ("configure\\.\\(ac\\|in\\)\\'" . autoconf-mode)
      ("BROWSE\\'" . ebrowse-tree-mode)
      ("\\.ebrowse\\'" . ebrowse-tree-mode)
Index: lisp/doc-view.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/doc-view.el,v
retrieving revision 1.4
diff -u -r1.4 doc-view.el
--- lisp/doc-view.el	3 Oct 2007 23:39:58 -0000	1.4
+++ lisp/doc-view.el	17 Oct 2007 19:51:48 -0000
@@ -5,7 +5,7 @@
 ;; Author: Tassilo Horn <tassilo@member.fsf.org>
 ;; Maintainer: Tassilo Horn <tassilo@member.fsf.org>
 ;; Keywords: files, pdf, ps, dvi
-;; Version: <2007-10-02 Tue 18:21>
+;; Version: <2007-10-17 Wed 21:22>
 
 ;; This file is part of GNU Emacs.
 
@@ -37,16 +37,19 @@
 ;; inside an Emacs buffer.  This buffer uses `doc-view-mode' which provides
 ;; convenient key bindings for browsing the document.
 ;;
-;; To use it simply do
+;; To use it simply open a document file with
 ;;
-;;     M-x doc-view RET
+;;     C-x C-f ~/path/to/document RET
 ;;
-;; and you'll be queried for a document to open.
+;; and the document will be converted and displayed, if your emacs supports png
+;; images.  With `C-c C-c' you can toggle between the rendered images
+;; representation and the source text representation of the document.  With
+;; `C-c C-e' you can switch to an appropriate editing mode for the document.
 ;;
 ;; Since conversion may take some time all the PNG images are cached in a
 ;; subdirectory of `doc-view-cache-directory' and reused when you want to view
-;; that file again.  This reusing can be omitted if you provide a prefx
-;; argument to `doc-view'.  To delete all cached files use
+;; that file again.  To reconvert a document hit `g' (`doc-view-reconvert-doc')
+;; when displaying the document.  To delete all cached files use
 ;; `doc-view-clear-cache'.  To open the cache with dired, so that you can tidy
 ;; it out use `doc-view-dired-cache'.
 ;;
@@ -67,8 +70,6 @@
 ;; bottom-right corner of the desired slice.  To reset the slice use
 ;; `doc-view-reset-slice' (bound to `s r').
 ;;
-;; Dired users should have a look at `doc-view-dired'.
-;;
 ;; You can also search within the document.  The command `doc-view-search'
 ;; (bound to `C-s') queries for a search regexp and initializes a list of all
 ;; matching pages and messages how many match-pages were found.  After that you
@@ -80,17 +81,16 @@
 ;; conversion.  When that finishes and you're still viewing the document
 ;; (i.e. you didn't switch to another buffer) you're queried for the regexp
 ;; then.
+;;
+;; Dired users can simply hit `v' on a document file.  If it's a PS, PDF or DVI
+;; it will be opened using `doc-view-mode'.
+;;
 
 ;;; Configuration:
 
-;; Basically doc-view should be quite usable with its standard settings, so
-;; putting
-;;
-;;     (require 'doc-view)
-;;
-;; into your `user-init-file' should be enough.  If the images are too small or
-;; too big you should set the "-rXXX" option in `doc-view-ghostscript-options'
-;; to another value.  (The bigger your screen, the higher the value.)
+;; If the images are too small or too big you should set the "-rXXX" option in
+;; `doc-view-ghostscript-options' to another value.  (The bigger your screen,
+;; the higher the value.)
 ;;
 ;; This and all other options can be set with the customization interface.
 ;; Simply do
@@ -201,7 +201,10 @@
 (defvar doc-view-current-info nil
   "Only used internally.")
 
-;;;; DocView Keymap
+(defvar doc-view-current-display nil
+  "Only used internally.")
+
+;;;; DocView Keymaps
 
 (defvar doc-view-mode-map
   (let ((map (make-sparse-keymap)))
@@ -235,9 +238,26 @@
     (define-key map (kbd "M-v")       'scroll-down)
     ;; Show the tooltip
     (define-key map (kbd "C-t")       'doc-view-show-tooltip)
+    ;; Toggle between text and image display or editing
+    (define-key map (kbd "C-c C-c")   'doc-view-toggle-display)
+    (define-key map (kbd "C-c C-e")   'doc-view-edit-doc)
+    ;; Reconvert the current document
+    (define-key map (kbd "g")         'doc-view-reconvert-doc)
     (suppress-keymap map)
     map)
-  "Keymap used by `doc-view-mode'.")
+  "Keymap used by `doc-view-mode' when displaying a doc as a set of images.")
+
+(defvar doc-view-mode-text-map
+  (let ((map (make-sparse-keymap)))
+    ;; Toggle between text and image display or editing
+    (define-key map (kbd "C-c C-c") 'doc-view-toggle-display)
+    (define-key map (kbd "C-c C-e") 'doc-view-edit-doc)
+    ;; Killing/burying the buffer (and the process)
+    (define-key map (kbd "q")         'bury-buffer)
+    (define-key map (kbd "k")         'doc-view-kill-proc-and-buffer)
+    (define-key map (kbd "C-x k")     'doc-view-kill-proc-and-buffer)
+    map)
+  "Keymap used by `doc-view-mode' when displaying a document as text.")
 
 ;;;; Navigation Commands
 
@@ -271,16 +291,16 @@
 			 (setq contexts (concat contexts "  - \"" m "\"\n")))
 		       contexts)))))
     ;; Update the buffer
-    (setq inhibit-read-only t)
-    (erase-buffer)
-    (let ((beg (point)))
-      (doc-view-insert-image (nth (1- page) doc-view-current-files)
-			     :pointer 'arrow)
-      (put-text-property beg (point) 'help-echo doc-view-current-info))
-    (insert "\n" doc-view-current-info)
-    (goto-char (point-min))
-    (forward-char)
-    (setq inhibit-read-only nil)))
+    (let ((inhibit-read-only t))
+      (erase-buffer)
+      (let ((beg (point)))
+	(doc-view-insert-image (nth (1- page) doc-view-current-files)
+			       :pointer 'arrow)
+	(put-text-property beg (point) 'help-echo doc-view-current-info))
+      (insert "\n" doc-view-current-info)
+      (goto-char (point-min))
+      (forward-char))
+    (set-buffer-modified-p nil)))
 
 (defun doc-view-next-page (&optional arg)
   "Browse ARG pages forward."
@@ -317,42 +337,62 @@
     (error (doc-view-previous-page)
 	   (goto-char (point-max)))))
 
+(defun doc-view-kill-proc ()
+  "Kill the current converter process."
+  (interactive)
+  (when doc-view-current-converter-process
+    (kill-process doc-view-current-converter-process))
+  (when doc-view-current-timer
+    (cancel-timer doc-view-current-timer)
+    (setq doc-view-current-timer nil))
+  (setq mode-line-process nil))
+
 (defun doc-view-kill-proc-and-buffer ()
   "Kill the current converter process and buffer."
   (interactive)
+  (doc-view-kill-proc)
   (when (eq major-mode 'doc-view-mode)
-    (when doc-view-current-converter-process
-      (kill-process doc-view-current-converter-process))
-    (when doc-view-current-timer
-      (cancel-timer doc-view-current-timer)
-      (setq doc-view-current-timer nil))
     (kill-buffer (current-buffer))))
 
 ;;;; Conversion Functions
 
-(defun doc-view-file-name-to-directory-name (file)
-  "Return the directory where the png files of FILE should be saved.
-
-It'a a subdirectory of `doc-view-cache-directory'."
+(defun doc-view-reconvert-doc (&rest args)
+  "Reconvert the current document.
+Should be invoked when the cached images aren't up-to-date."
+  (interactive)
+  (let ((inhibit-read-only t)
+	(doc doc-view-current-doc))
+    (doc-view-kill-proc)
+    ;; Clear the old cached files
+    (when (file-exists-p (doc-view-current-cache-dir))
+      (dired-delete-file (doc-view-current-cache-dir) 'always))
+    (doc-view-kill-proc-and-buffer)
+    (find-file doc)))
+
+(defun doc-view-current-cache-dir ()
+  "Return the directory where the png files of the current doc should be saved.
+It's a subdirectory of `doc-view-cache-directory'."
   (if doc-view-current-cache-dir
       doc-view-current-cache-dir
-    (file-name-as-directory
-     (concat (file-name-as-directory doc-view-cache-directory)
-	     (with-temp-buffer
-	       (insert-file-contents-literally file)
-	       (md5 (current-buffer)))))))
+    (setq doc-view-current-cache-dir
+	  (file-name-as-directory
+	   (concat (file-name-as-directory doc-view-cache-directory)
+		   (let ((doc doc-view-current-doc))
+		     (with-temp-buffer
+		       (insert-file-contents-literally doc)
+		       (md5 (current-buffer)))))))))
 
 (defun doc-view-dvi->pdf-sentinel (proc event)
   "If DVI->PDF conversion was successful, convert the PDF to PNG now."
   (if (not (string-match "finished" event))
       (message "DocView: dvi->pdf process changed status to %s." event)
     (set-buffer (process-get proc 'buffer))
-    (setq doc-view-current-converter-process nil)
+    (setq doc-view-current-converter-process nil
+	  mode-line-process nil)
     (message "DocView: finished conversion from DVI to PDF!")
     ;; Now go on converting this PDF to a set of PNG files.
     (let* ((pdf (process-get proc 'pdf-file))
-	   (png (concat (doc-view-file-name-to-directory-name
-			 doc-view-current-doc)
+	   (png (concat (doc-view-current-cache-dir)
 			"page-%d.png")))
       (doc-view-pdf/ps->png pdf png))))
 
@@ -360,9 +400,10 @@
   "Convert DVI to PDF asynchrounously."
   (message "DocView: converting DVI to PDF now!")
   (setq doc-view-current-converter-process
-	(start-process "doc-view-dvi->pdf" doc-view-conversion-buffer
+	(start-process "dvi->pdf" doc-view-conversion-buffer
 		       doc-view-dvipdfm-program
-		       "-o" pdf dvi))
+		       "-o" pdf dvi)
+	mode-line-process (list (format ":%s" doc-view-current-converter-process)))
   (set-process-sentinel doc-view-current-converter-process
 			'doc-view-dvi->pdf-sentinel)
   (process-put doc-view-current-converter-process 'buffer   (current-buffer))
@@ -373,7 +414,8 @@
   (if (not (string-match "finished" event))
       (message "DocView: converter process changed status to %s." event)
     (set-buffer (process-get proc 'buffer))
-    (setq doc-view-current-converter-process nil)
+    (setq doc-view-current-converter-process nil
+	  mode-line-process nil)
     (when doc-view-current-timer
       (cancel-timer doc-view-current-timer)
       (setq doc-view-current-timer nil))
@@ -386,11 +428,12 @@
   (message "DocView: converting PDF or PS to PNG now!")
   (setq doc-view-current-converter-process
 	(apply 'start-process
-	       (append (list "doc-view-pdf/ps->png" doc-view-conversion-buffer
+	       (append (list "pdf/ps->png" doc-view-conversion-buffer
 			     doc-view-ghostscript-program)
 		       doc-view-ghostscript-options
 		       (list (concat "-sOutputFile=" png))
-		       (list pdf-ps))))
+		       (list pdf-ps)))
+	mode-line-process (list (format ":%s" doc-view-current-converter-process)))
   (process-put doc-view-current-converter-process
 	       'buffer (current-buffer))
   (set-process-sentinel doc-view-current-converter-process
@@ -398,7 +441,7 @@
   (when doc-view-conversion-refresh-interval
     (setq doc-view-current-timer
 	  (run-at-time "1 secs" doc-view-conversion-refresh-interval
-		       'doc-view-display
+		       'doc-view-display-maybe
 		       doc-view-current-doc))))
 
 (defun doc-view-pdf->txt-sentinel (proc event)
@@ -407,7 +450,8 @@
     (let ((current-buffer (current-buffer))
 	  (proc-buffer    (process-get proc 'buffer)))
       (set-buffer proc-buffer)
-      (setq doc-view-current-converter-process nil)
+      (setq doc-view-current-converter-process nil
+	    mode-line-process nil)
       (message "DocView: finished conversion from PDF to TXT!")
       ;; If the user looks at the DocView buffer where the conversion was
       ;; performed, search anew.  This time it will be queried for a regexp.
@@ -418,9 +462,10 @@
   "Convert PDF to TXT asynchrounously."
   (message "DocView: converting PDF to TXT now!")
   (setq doc-view-current-converter-process
-	(start-process "doc-view-pdf->txt" doc-view-conversion-buffer
+	(start-process "pdf->txt" doc-view-conversion-buffer
 		       doc-view-pdftotext-program "-raw"
-		       pdf txt))
+		       pdf txt)
+	mode-line-process (list (format ":%s" doc-view-current-converter-process)))
   (set-process-sentinel doc-view-current-converter-process
 			'doc-view-pdf->txt-sentinel)
   (process-put doc-view-current-converter-process 'buffer (current-buffer)))
@@ -429,65 +474,44 @@
   (if (not (string-match "finished" event))
       (message "DocView: converter process changed status to %s." event)
     (set-buffer (process-get proc 'buffer))
-    (setq doc-view-current-converter-process nil)
+    (setq doc-view-current-converter-process nil
+	  mode-line-process nil)
     (message "DocView: finished conversion from PS to PDF!")
     ;; Now we can transform to plain text.
     (doc-view-pdf->txt (process-get proc 'pdf-file)
-		       (concat (doc-view-file-name-to-directory-name
-				doc-view-current-doc)
+		       (concat (doc-view-current-cache-dir)
 			       "doc.txt"))))
 
 (defun doc-view-ps->pdf (ps pdf)
   "Convert PS to PDF asynchronously."
   (message "DocView: converting PS to PDF now!")
   (setq doc-view-current-converter-process
-	(start-process "doc-view-ps->pdf" doc-view-conversion-buffer
+	(start-process "ps->pdf" doc-view-conversion-buffer
 		       doc-view-ps2pdf-program
-		       ps pdf))
+		       ps pdf)
+	mode-line-process (list (format ":%s" doc-view-current-converter-process)))
   (set-process-sentinel doc-view-current-converter-process
 			'doc-view-ps->pdf-sentinel)
   (process-put doc-view-current-converter-process 'buffer   (current-buffer))
   (process-put doc-view-current-converter-process 'pdf-file pdf))
 
-(defun doc-view-convert-doc (doc)
-  "Convert DOC to a set of png files, one file per page.
-
-Those files are saved in the directory given by
-`doc-view-file-name-to-directory-name'."
+(defun doc-view-convert-current-doc ()
+  "Convert `doc-view-current-doc' to a set of png files, one file per page.
+Those files are saved in the directory given by the function
+`doc-view-current-cache-dir'."
   (clear-image-cache)
-  (let* ((dir (doc-view-file-name-to-directory-name doc))
-	 (png-file (concat (file-name-as-directory dir) "page-%d.png")))
-    (when (file-exists-p dir)
-      (dired-delete-file dir 'always))
-    (make-directory dir t)
-    (if (not (string= (file-name-extension doc) "dvi"))
+  (let ((png-file (concat (doc-view-current-cache-dir)
+			  "page-%d.png")))
+    (make-directory doc-view-current-cache-dir t)
+    (if (not (string= (file-name-extension doc-view-current-doc) "dvi"))
 	;; Convert to PNG images.
-	(doc-view-pdf/ps->png doc png-file)
+	(doc-view-pdf/ps->png doc-view-current-doc png-file)
       ;; DVI files have to be converted to PDF before GhostScript can process
       ;; it.
-      (doc-view-dvi->pdf doc
-			 (concat (file-name-as-directory dir)
+      (doc-view-dvi->pdf doc-view-current-doc
+			 (concat (file-name-as-directory doc-view-current-cache-dir)
 				 "doc.pdf")))))
 
-;;;; DocView Mode
-
-(define-derived-mode doc-view-mode nil "DocView"
-  "Major mode in DocView buffers.
-
-\\{doc-view-mode-map}"
-  :group 'doc-view
-  (setq buffer-read-only t)
-  (make-local-variable 'doc-view-current-files)
-  (make-local-variable 'doc-view-current-doc)
-  (make-local-variable 'doc-view-current-image)
-  (make-local-variable 'doc-view-current-page)
-  (make-local-variable 'doc-view-current-converter-process)
-  (make-local-variable 'doc-view-current-timer)
-  (make-local-variable 'doc-view-current-slice)
-  (make-local-variable 'doc-view-current-cache-dir)
-  (make-local-variable 'doc-view-current-info)
-  (make-local-variable 'doc-view-current-search-matches))
-
 ;;;; Slicing
 
 (defun doc-view-set-slice (x y width height)
@@ -555,19 +579,22 @@
 	nil
       (string< a b))))
 
+(defun doc-view-display-maybe (doc)
+  "Call `doc-view-display' iff we're in the image display."
+  (when (eq doc-view-current-display 'image)
+    (doc-view-display doc)))
+
 (defun doc-view-display (doc)
   "Start viewing the document DOC."
-  (let ((dir (doc-view-file-name-to-directory-name doc)))
-    (set-buffer (format "*DocView: %s*" doc))
-    (setq doc-view-current-files
-	  (sort (directory-files dir t "page-[0-9]+\\.png" t)
-		'doc-view-sort))
-    (when (> (length doc-view-current-files) 0)
-      (doc-view-goto-page doc-view-current-page))))
+  (set-buffer (get-file-buffer doc))
+  (setq doc-view-current-files
+	(sort (directory-files (doc-view-current-cache-dir) t
+			       "page-[0-9]+\\.png" t)
+	      'doc-view-sort))
+  (when (> (length doc-view-current-files) 0)
+    (doc-view-goto-page doc-view-current-page)))
 
 (defun doc-view-buffer-message ()
-  (setq inhibit-read-only t)
-  (erase-buffer)
   (insert (propertize "Welcome to DocView!" 'face 'bold)
 	  "\n"
 	  "
@@ -580,12 +607,58 @@
 
 `q' : Bury this buffer.  Conversion will go on in background.
 `k' : Kill the conversion process and this buffer.\n")
-  (setq inhibit-read-only nil))
+  (set-buffer-modified-p nil))
 
 (defun doc-view-show-tooltip ()
   (interactive)
   (tooltip-show doc-view-current-info))
 
+;;;;; Toggle between text and image display
+
+(defun doc-view-toggle-display ()
+  "Start or stop displaying a document file as a set of images.
+This command toggles between showing the text of the document
+file and showing the document as a set of images."
+  (interactive)
+  (if (get-text-property (point-min) 'display)
+      ;; Switch to text display
+      (let ((inhibit-read-only t))
+	(erase-buffer)
+	(insert-file-contents doc-view-current-doc)
+	(use-local-map doc-view-mode-text-map)
+	(setq mode-name "DocView[text]"
+	      doc-view-current-display 'text)
+	(if (called-interactively-p)
+	    (message "Repeat this command to go back to displaying the file as images")))
+    ;; Switch to image display
+    (let ((inhibit-read-only t))
+      (erase-buffer)
+      (doc-view-buffer-message)
+      (setq doc-view-current-page (or doc-view-current-page 1))
+      (if (file-exists-p (doc-view-current-cache-dir))
+	  (progn
+	    (message "DocView: using cached files!")
+	    (doc-view-display doc-view-current-doc))
+	(doc-view-convert-current-doc))
+      (use-local-map doc-view-mode-map)
+      (setq mode-name (format "DocView")
+	    doc-view-current-display 'image)
+      (if (called-interactively-p)
+	  (message "Repeat this command to go back to displaying the file as text"))))
+  (set-buffer-modified-p nil))
+
+;;;;; Leave doc-view-mode and open the file for edit
+
+(defun doc-view-edit-doc ()
+  "Leave `doc-view-mode' and open the current doc with an appropriate editing mode."
+  (interactive)
+  (let ((filename doc-view-current-doc)
+	(auto-mode-alist (append '(("\\.[eE]?[pP][sS]\\'" . ps-mode)
+				   ("\\.\\(pdf\\|PDF\\|dvi\\|DVI\\)$" . fundamental-mode))
+				 auto-mode-alist)))
+    (kill-buffer (current-buffer))
+    (find-file filename)))
+
 ;;;; Searching
 
 (defun doc-view-search-internal (regexp file)
@@ -636,8 +709,7 @@
   (interactive)
   ;; New search, so forget the old results.
   (setq doc-view-current-search-matches nil)
-  (let ((txt (concat (doc-view-file-name-to-directory-name
-		      doc-view-current-doc)
+  (let ((txt (concat (doc-view-current-cache-dir)
 		     "doc.txt")))
     (if (file-readable-p txt)
 	(progn
@@ -660,14 +732,12 @@
 	    ;; Doc is a PS, so convert it to PDF (which will be converted to
 	    ;; TXT thereafter).
 	    (doc-view-ps->pdf doc-view-current-doc
-			      (concat (doc-view-file-name-to-directory-name
-				       doc-view-current-doc)
+			      (concat (doc-view-current-cache-dir)
 				      "doc.pdf")))
 	   ((string= ext "dvi")
 	    ;; Doc is a DVI.  This means that a doc.pdf already exists in its
 	    ;; cache subdirectory.
-	    (doc-view-pdf->txt (concat (doc-view-file-name-to-directory-name
-					doc-view-current-doc)
+	    (doc-view-pdf->txt (concat (doc-view-current-cache-dir)
 				       "doc.pdf")
 			       txt))
 	   (t (error "DocView doesn't know what to do"))))))))
@@ -698,52 +768,42 @@
 	     (y-or-n-p "No more matches before current page.  Wrap to last match? "))
 	(doc-view-goto-page (caar (last doc-view-current-search-matches)))))))
 
-;;;; User Interface Commands
+;;;; User interface commands and the mode
+
+(put 'doc-view-mode 'mode-class 'special)
 
 ;;;###autoload
-(defun doc-view (no-cache &optional file)
-  "Convert FILE to png and start viewing it.
-If no FILE is given, query for on.
-If this FILE is still in the cache, don't convert and use the
-existing page files.  With prefix arg NO-CACHE, don't use the
-cached files and convert anew."
-  (interactive "P")
-  (if (not (and (image-type-available-p 'png)
-		(display-images-p)))
-      (message "DocView: your emacs or display doesn't support png images.")
-    (let* ((doc (or file
-		    (expand-file-name
-		     (let ((completion-ignored-extensions
-			    ;; Don't hide files doc-view can display
-			    (remove-if (lambda (str)
-					 (string-match "\\.\\(ps\\|pdf\\|dvi\\)$"
-						       str))
-				       completion-ignored-extensions)))
-		       (read-file-name "File: " nil nil t)))))
-	   (buffer (get-buffer-create (format "*DocView: %s*" doc)))
-	   (dir (doc-view-file-name-to-directory-name doc)))
-      (switch-to-buffer buffer)
-      (doc-view-buffer-message)
-      (doc-view-mode)
-      (setq doc-view-current-doc doc)
-      (setq doc-view-current-page 1)
-      (if (not (and (file-exists-p dir)
-		    (not no-cache)))
-	  (progn
-	    (setq doc-view-current-cache-dir nil)
-	    (doc-view-convert-doc doc-view-current-doc))
-	(message "DocView: using cached files!")
-	(doc-view-display doc-view-current-doc)))))
-
-(defun doc-view-dired (no-cache)
-  "View the current dired file with doc-view.
-NO-CACHE is the same as in `doc-view'.
-
-You might want to bind this command to a dired key, e.g.
-
-    (define-key dired-mode-map (kbd \"C-c d\") 'doc-view-dired)"
-  (interactive "P")
-  (doc-view no-cache (dired-get-file-for-visit)))
+(define-derived-mode doc-view-mode nil "DocView"
+  "Major mode in DocView buffers.
+You can use \\<doc-view-mode-map>\\[doc-view-toggle-display] to
+toggle between display as a set of images and display as text."
+  :group 'doc-view
+  (make-local-variable 'doc-view-current-files)
+  (make-local-variable 'doc-view-current-doc)
+  (make-local-variable 'doc-view-current-image)
+  (make-local-variable 'doc-view-current-page)
+  (make-local-variable 'doc-view-current-converter-process)
+  (make-local-variable 'doc-view-current-timer)
+  (make-local-variable 'doc-view-current-slice)
+  (make-local-variable 'doc-view-current-cache-dir)
+  (make-local-variable 'doc-view-current-info)
+  (make-local-variable 'doc-view-current-search-matches)
+  (setq doc-view-current-doc (buffer-file-name))
+  (insert-file-contents doc-view-current-doc)
+  (use-local-map doc-view-mode-text-map)
+  (setq mode-name "DocView[text]"
+	doc-view-current-display 'text
+	buffer-read-only t
+	revert-buffer-function 'doc-view-reconvert-doc)
+  ;; Switch to image display if possible
+  (if (and (display-images-p)
+	   (image-type-available-p 'png)
+	   (not (get-text-property (point-min) 'display)))
+      (doc-view-toggle-display))
+  (message
+   "%s"
+   (substitute-command-keys
+    "Type \\[doc-view-toggle-display] to toggle between image and text display.")))
 
 (defun doc-view-clear-cache ()
   "Delete the whole cache (`doc-view-cache-directory')."
Index: lisp/bindings.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/bindings.el,v
retrieving revision 1.185
diff -u -r1.185 bindings.el
--- lisp/bindings.el	6 Oct 2007 22:15:43 -0000	1.185
+++ lisp/bindings.el	17 Oct 2007 19:51:49 -0000
@@ -536,7 +536,7 @@
        '(".elc" ".lof"
 	 ".glo" ".idx" ".lot"
 	 ;; TeX-related
-	 ".dvi" ".fmt" ".tfm" ".pdf"
+	 ".fmt" ".tfm"
 	 ;; Java compiled
 	 ".class"
 	 ;; CLISP
Index: lisp/ChangeLog
===================================================================
RCS file: /sources/emacs/emacs/lisp/ChangeLog,v
retrieving revision 1.11948
diff -u -r1.11948 ChangeLog
--- lisp/ChangeLog	17 Oct 2007 16:24:33 -0000	1.11948
+++ lisp/ChangeLog	17 Oct 2007 19:51:55 -0000
@@ -1,3 +1,16 @@
+2007-10-17  Tassilo Horn  <tassilo@member.fsf.org>
+
+	* bindings.el (completion-ignored-extensions): Remove pdf and dvi
+	extensions since they can be viewed with doc-view.
+
+	* files.el (auto-mode-alist): Make doc-view-mode the default mode
+	for pdf, ps and dvi files.
+
+	* doc-view.el: Make doc-view-mode the standard mode for viewing
+	pdf, [e]ps and dvi files and add binding C-c C-c to toggle between
+	text and image display.  Add binding C-c C-e to switch to an
+	editing mode.
+
 2007-10-17  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* progmodes/compile.el (compilation-next-error-function): Fix timestamp

[-- Attachment #3: Type: text/plain, Size: 142 bytes --]

_______________________________________________
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Emacs-devel@gnu.org
http://lists.gnu.org/mailman/listinfo/emacs-devel

Re: doc-view.el: about cursor and filename display

[Richard Stallman]

    > You could also indicate in the mode line that the process is running.

    doc-view indicates with a message and in the tooltip that conversion
    hasn't finished yet.

If users are happy with that, then good.  But maybe it should indicate
in the mode line as M-x compile does.  It shows "Compiling" in all
buffers' mode lines.

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

Richard Stallman <rms@gnu.org> writes:

>     > You could also indicate in the mode line that the process is running.
>
>     doc-view indicates with a message and in the tooltip that conversion
>     hasn't finished yet.
>
> If users are happy with that, then good.  But maybe it should indicate
> in the mode line as M-x compile does.  It shows "Compiling" in all
> buffers' mode lines.

Stefan pointed me to mode-line-process, and the newest patch uses that
to indicate that (and what for) a conversion process is running.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[Dan Nicolaescu]

Tassilo Horn <tassilo@member.fsf.org> writes:

  > Index: lisp/files.el
  > ===================================================================
  > RCS file: /sources/emacs/emacs/lisp/files.el,v
  > retrieving revision 1.932
  > diff -u -r1.932 files.el
  > --- lisp/files.el	15 Oct 2007 02:07:46 -0000	1.932
  > +++ lisp/files.el	17 Oct 2007 19:51:46 -0000
  > @@ -2059,7 +2059,7 @@
  >       ("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode)
  >       ("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode)
  >       ("\\.\\(dif\\|pat\\)\\'" . diff-mode) ; for MSDOG
  > -     ("\\.[eE]?[pP][sS]\\'" . ps-mode)
  > +     ("\\(?:DVI\\|EPS\\|P\\(?:DF\\|S\\)\\|dvi\\|eps\\|p\\(?:df\\|s\\)\\)" . doc-view-mode)

Is this a good idea? 
PostScript is not only used for documents, but it is also a
programming language. How likely is it that someone that does a C-x
C-f for a ps file does it in order to view it, not to edit it? 
I haven't done it in a long time, but I used to regularly have to
tweak ps files generated by various utilities... 

Re: doc-view.el: about cursor and filename display

[Miles Bader]

Dan Nicolaescu <dann@ics.uci.edu> writes:
> Is this a good idea? 
> PostScript is not only used for documents, but it is also a
> programming language. How likely is it that someone that does a C-x
> C-f for a ps file does it in order to view it, not to edit it? 
> I haven't done it in a long time, but I used to regularly have to
> tweak ps files generated by various utilities... 

Yeah, I agree -- it's a fine programming language in its own way, and
quite reasonable as a real source language.

I'd guess in such cases, given that Emacs is fundamentally a
text-editor, it seems best to do something like Emacs already does for
.xpm files:  display as text (in postscript-mode or whatever) with a
message saying "Type C-c C-c to view the printed form of this document."

Indeed, for hacking on postscript, this would be great -- just make a
change, then hit C-c C-c to see the effect in the same window!

-Miles

-- 
"Though they may have different meanings, the cries of 'Yeeeee-haw!' and
 'Allahu akbar!' are, in spirit, not actually all that different."

Re: doc-view.el: about cursor and filename display

[Richard Stallman]

    While conversion there's a message

      Page 12 of 123. (still converting...)

    below the already displayed image to indicate, that the document has
    more than 123 pages, but only 123 pages have been converted so far.

That might be sufficient to the user notification of the progress.
However, using mode-line-process is a good idea anyway.

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

Richard Stallman <rms@gnu.org> writes:

>     While conversion there's a message
>
>       Page 12 of 123. (still converting...)
>
>     below the already displayed image to indicate, that the document has
>     more than 123 pages, but only 123 pages have been converted so far.
>
> That might be sufficient to the user notification of the progress.
> However, using mode-line-process is a good idea anyway.

Done!

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

Dan Nicolaescu <dann@ics.uci.edu> writes:

> Tassilo Horn <tassilo@member.fsf.org> writes:
>
>   > Index: lisp/files.el
>   > ===================================================================
>   > RCS file: /sources/emacs/emacs/lisp/files.el,v
>   > retrieving revision 1.932
>   > diff -u -r1.932 files.el
>   > --- lisp/files.el	15 Oct 2007 02:07:46 -0000	1.932
>   > +++ lisp/files.el	17 Oct 2007 19:51:46 -0000
>   > @@ -2059,7 +2059,7 @@
>   >       ("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode)
>   >       ("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode)
>   >       ("\\.\\(dif\\|pat\\)\\'" . diff-mode) ; for MSDOG
>   > -     ("\\.[eE]?[pP][sS]\\'" . ps-mode)
>   > +     ("\\(?:DVI\\|EPS\\|P\\(?:DF\\|S\\)\\|dvi\\|eps\\|p\\(?:df\\|s\\)\\)" . doc-view-mode)
>
> Is this a good idea? 
> PostScript is not only used for documents, but it is also a
> programming language. How likely is it that someone that does a C-x
> C-f for a ps file does it in order to view it, not to edit it?

When people know doc-view it's very likely.  To open a PS file for
editing you can do C-c C-e in doc-view-mode.  To view the file after you
made some changes M-x revert-buffer should do the trick.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[David Kastrup]

Tassilo Horn <tassilo@member.fsf.org> writes:

> Dan Nicolaescu <dann@ics.uci.edu> writes:
>
>> Tassilo Horn <tassilo@member.fsf.org> writes:
>>
>>   > Index: lisp/files.el
>>   > ===================================================================
>>   > RCS file: /sources/emacs/emacs/lisp/files.el,v
>>   > retrieving revision 1.932
>>   > diff -u -r1.932 files.el
>>   > --- lisp/files.el	15 Oct 2007 02:07:46 -0000	1.932
>>   > +++ lisp/files.el	17 Oct 2007 19:51:46 -0000
>>   > @@ -2059,7 +2059,7 @@
>>   >       ("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode)
>>   >       ("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode)
>>   >       ("\\.\\(dif\\|pat\\)\\'" . diff-mode) ; for MSDOG
>>   > -     ("\\.[eE]?[pP][sS]\\'" . ps-mode)
>>   > +     ("\\(?:DVI\\|EPS\\|P\\(?:DF\\|S\\)\\|dvi\\|eps\\|p\\(?:df\\|s\\)\\)" . doc-view-mode)
>>
>> Is this a good idea? 
>> PostScript is not only used for documents, but it is also a
>> programming language. How likely is it that someone that does a C-x
>> C-f for a ps file does it in order to view it, not to edit it?
>
> When people know doc-view it's very likely.

No, it isn't.  We can do a poll if you think otherwise.

-- 
David Kastrup

Re: doc-view.el: about cursor and filename display

[Tassilo Horn]

David Kastrup <dak@gnu.org> writes:

>>>   > Index: lisp/files.el
>>>   > ===================================================================
>>>   > RCS file: /sources/emacs/emacs/lisp/files.el,v
>>>   > retrieving revision 1.932
>>>   > diff -u -r1.932 files.el
>>>   > --- lisp/files.el	15 Oct 2007 02:07:46 -0000	1.932
>>>   > +++ lisp/files.el	17 Oct 2007 19:51:46 -0000
>>>   > @@ -2059,7 +2059,7 @@
>>>   >       ("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode)
>>>   >       ("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode)
>>>   >       ("\\.\\(dif\\|pat\\)\\'" . diff-mode) ; for MSDOG
>>>   > -     ("\\.[eE]?[pP][sS]\\'" . ps-mode)
>>>   > +     ("\\(?:DVI\\|EPS\\|P\\(?:DF\\|S\\)\\|dvi\\|eps\\|p\\(?:df\\|s\\)\\)" . doc-view-mode)
>>>
>>> Is this a good idea? 
>>> PostScript is not only used for documents, but it is also a
>>> programming language. How likely is it that someone that does a C-x
>>> C-f for a ps file does it in order to view it, not to edit it?
>>
>> When people know doc-view it's very likely.
>
> No, it isn't.  We can do a poll if you think otherwise.

Ok, ok.  On my todo list is an entry that inside doc-view-mode `C-c C-c'
should toggle between "a real editing major mode" (e.g. ps-mode) and
doc-view-mode.

Bye,
Tassilo

Re: doc-view.el: about cursor and filename display

[David Kastrup]

Tassilo Horn <tassilo@member.fsf.org> writes:

> David Kastrup <dak@gnu.org> writes:
>
>>>>   > Index: lisp/files.el
>>>>   > ===================================================================
>>>>   > RCS file: /sources/emacs/emacs/lisp/files.el,v
>>>>   > retrieving revision 1.932
>>>>   > diff -u -r1.932 files.el
>>>>   > --- lisp/files.el	15 Oct 2007 02:07:46 -0000	1.932
>>>>   > +++ lisp/files.el	17 Oct 2007 19:51:46 -0000
>>>>   > @@ -2059,7 +2059,7 @@
>>>>   >       ("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode)
>>>>   >       ("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode)
>>>>   >       ("\\.\\(dif\\|pat\\)\\'" . diff-mode) ; for MSDOG
>>>>   > -     ("\\.[eE]?[pP][sS]\\'" . ps-mode)
>>>>   > +     ("\\(?:DVI\\|EPS\\|P\\(?:DF\\|S\\)\\|dvi\\|eps\\|p\\(?:df\\|s\\)\\)" . doc-view-mode)
>>>>
>>>> Is this a good idea? 
>>>> PostScript is not only used for documents, but it is also a
>>>> programming language. How likely is it that someone that does a C-x
>>>> C-f for a ps file does it in order to view it, not to edit it?
>>>
>>> When people know doc-view it's very likely.
>>
>> No, it isn't.  We can do a poll if you think otherwise.
>
> Ok, ok.  On my todo list is an entry that inside doc-view-mode `C-c C-c'
> should toggle between "a real editing major mode" (e.g. ps-mode) and
> doc-view-mode.

I think for our various image view modes, C-x C-r should preferably
start the viewer, but C-x C-f should possibly start the editor.  At
the very least, C-u C-x C-f should start the editor, "I mean it!".

-- 
David Kastrup

Re: doc-view.el: about cursor and filename display

[Reiner Steib]

On Thu, Oct 18 2007, Tassilo Horn wrote:

> On my todo list is an entry that inside doc-view-mode `C-c C-c'
> should toggle between "a real editing major mode" (e.g. ps-mode) and
> doc-view-mode.

I modified the change to `auto-mode-alist' (don't open PS and EPS with
doc-view by default) as this seem to be controversial.

Bye, Reiner.
-- 
       ,,,
      (o o)
---ooO-(_)-Ooo---  |  PGP key available  |  http://rsteib.home.pages.de/

Re: doc-view.el: about cursor and filename display

[Juri Linkov]

> I think for our various image view modes, C-x C-r should preferably
> start the viewer, but C-x C-f should possibly start the editor.  At
> the very least, C-u C-x C-f should start the editor, "I mean it!".

Or maybe, if a file is opened in read-only mode (even C-x C-f on
a non-writable file), then start the viewer.

-- 
Juri Linkov
http://www.jurta.org/emacs/

Re: doc-view.el: about cursor and filename display

[Richard Stallman]

    I'd guess in such cases, given that Emacs is fundamentally a
    text-editor, it seems best to do something like Emacs already does for
    .xpm files:  display as text (in postscript-mode or whatever) with a
    message saying "Type C-c C-c to view the printed form of this document."

Thus, for PS, we would show the text initially; for PDF and DVI, we would
show the rendered form initially.  That seems ok.

Re: doc-view.el: about cursor and filename display

[David Kastrup]

Richard Stallman <rms@gnu.org> writes:

>     I'd guess in such cases, given that Emacs is fundamentally a
>     text-editor, it seems best to do something like Emacs already does for
>     .xpm files:  display as text (in postscript-mode or whatever) with a
>     message saying "Type C-c C-c to view the printed form of this document."
>
> Thus, for PS, we would show the text initially; for PDF and DVI, we
> would show the rendered form initially.  That seems ok.

I am actually looking at PDF source quite often.  It is, after all,
more or less a restricted form of PostScript as long as one does not
use compression (but compression can be used in PostScript, too).

-- 
David Kastrup

Re: doc-view.el: about cursor and filename display

[Miles Bader]

David Kastrup <dak@gnu.org> writes:
>> Thus, for PS, we would show the text initially; for PDF and DVI, we
>> would show the rendered form initially.  That seems ok.
>
> I am actually looking at PDF source quite often.  It is, after all,
> more or less a restricted form of PostScript as long as one does not
> use compression (but compression can be used in PostScript, too).

Unlike postscript, I think editing of pdf files as text is vanishingly
rare, even if it's possible, and clearly shouldn't be the default.

Clearly it would be nice if choosing the default action for any given
file type was easy though...

-Miles

-- 
"1971 pickup truck; will trade for guns"

Re: doc-view.el: about cursor and filename display

[Richard Stallman]

    > Thus, for PS, we would show the text initially; for PDF and DVI, we
    > would show the rendered form initially.  That seems ok.

    I am actually looking at PDF source quite often.

I think you are unusual, so you should customize the settings.

Re: doc-view.el: about cursor and filename display

[David Kastrup]

Miles Bader <miles@gnu.org> writes:

> David Kastrup <dak@gnu.org> writes:
>>> Thus, for PS, we would show the text initially; for PDF and DVI, we
>>> would show the rendered form initially.  That seems ok.
>>
>> I am actually looking at PDF source quite often.  It is, after all,
>> more or less a restricted form of PostScript as long as one does not
>> use compression (but compression can be used in PostScript, too).
>
> Unlike postscript, I think editing of pdf files as text is vanishingly
> rare, even if it's possible, and clearly shouldn't be the default.
>
> Clearly it would be nice if choosing the default action for any given
> file type was easy though...

There is a difference to PostScript, actually: when I am looking at
PDF, I am only _reading_ it, ever (PDF contains file offset tables at
the end which makes it rather inconvenient to hand-edit).

One can actually write PostScript, in contrast.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

Re: doc-view.el: about cursor and filename display

[Stefan Monnier]

> There is a difference to PostScript, actually: when I am looking at
> PDF, I am only _reading_ it, ever (PDF contains file offset tables at
> the end which makes it rather inconvenient to hand-edit).

Is there a pdf-mode somewhere?  Maybe one which could decompress the PDF to
show the underlying postscript-like text-form?


        Stefan

Re: doc-view.el: about cursor and filename display

[David Kastrup]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> There is a difference to PostScript, actually: when I am looking at
>> PDF, I am only _reading_ it, ever (PDF contains file offset tables at
>> the end which makes it rather inconvenient to hand-edit).
>
> Is there a pdf-mode somewhere?  Maybe one which could decompress the
> PDF to show the underlying postscript-like text-form?

PDF is not per se compressed.  It can include compressed streams and
objects, though.

pdftk can be used for uncompressing this kind of stuff.  The result is
still a valid PDF file, just larger.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

Re: doc-view.el: about cursor and filename display

[Stefan Monnier]

>>> There is a difference to PostScript, actually: when I am looking at
>>> PDF, I am only _reading_ it, ever (PDF contains file offset tables at
>>> the end which makes it rather inconvenient to hand-edit).
>> 
>> Is there a pdf-mode somewhere?  Maybe one which could decompress the
>> PDF to show the underlying postscript-like text-form?

> PDF is not per se compressed.  It can include compressed streams and
> objects, though.

> pdftk can be used for uncompressing this kind of stuff.  The result is
> still a valid PDF file, just larger.

Yes, I understand that, which is why we'd need a special major mode to
uncompress the various parts (and recompress them when saving, I guess,
although as you say, this would first imply the ability to update the
offset tables).


        Stefan