bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[usr.gentoo]

Hi,

when visiting .info files in Emacs via find-file Emacs opens the file in the
default major-mode instead of Emacs' info-mode. I suggest therefore to add the
following default-association:

 (add-to-list 'auto-mode-alist '("\\.info\\'" . info))


HTH,

Geralt.

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Juri Linkov]

> when visiting .info files in Emacs via find-file Emacs opens the file in the
> default major-mode instead of Emacs' info-mode. I suggest therefore to add the
> following default-association:
>
>  (add-to-list 'auto-mode-alist '("\\.info\\'" . info))

This doesn't work for me.  However, the following does:

(add-to-list 'auto-mode-alist '("\\.info\\'" .
              (lambda () (interactive)
                (info (buffer-file-name)))))

I think this has too bad consequences: it visits the Info file,
but doesn't display it.  Instead, it displays another buffer
with the Info manual.

Maybe `dired-info' from `dired-x.el' is more suitable for your needs?
At least, it doesn't visit the Info file.

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

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Kevin Rodgers]

usr.gentoo@googlemail.com wrote:

> when visiting .info files in Emacs via find-file Emacs opens the file in the
> default major-mode instead of Emacs' info-mode. I suggest therefore to add the
> following default-association:
> 
>  (add-to-list 'auto-mode-alist '("\\.info\\'" . info))

The value of major-mode in an Info buffer is Info-mode:

(add-to-list 'auto-mode-alist '("\\.info\\'" . Info-mode))

-- 
Kevin Rodgers
Denver, Colorado, USA

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Juri Linkov]

>> when visiting .info files in Emacs via find-file Emacs opens the file in the
>> default major-mode instead of Emacs' info-mode. I suggest therefore to add the
>> following default-association:
>>
>>  (add-to-list 'auto-mode-alist '("\\.info\\'" . info))
>
> The value of major-mode in an Info buffer is Info-mode:
>
> (add-to-list 'auto-mode-alist '("\\.info\\'" . Info-mode))

This doesn't work too.  It seems `Info-on-current-buffer' was created
exactly for the purpose to be associated with .info in auto-mode-alist.
It is not used anywhere else.

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

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Stefan Monnier]

> This doesn't work too.  It seems `Info-on-current-buffer' was created
> exactly for the purpose to be associated with .info in auto-mode-alist.
> It is not used anywhere else.

Yes, I wrote Info-on-current-buffer specifically for this kind of use,
but no it doesn't work for the auto-mode-alist, really.
There is no good reason why it can't work for auto-mode-alist, but it's
the way it currently is.  Patches welcome,


        Stefan

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Kevin Rodgers]

Juri Linkov wrote:
>>> when visiting .info files in Emacs via find-file Emacs opens the file in the
>>> default major-mode instead of Emacs' info-mode. I suggest therefore to add the
>>> following default-association:
>>>
>>>  (add-to-list 'auto-mode-alist '("\\.info\\'" . info))
>> The value of major-mode in an Info buffer is Info-mode:
>>
>> (add-to-list 'auto-mode-alist '("\\.info\\'" . Info-mode))
> 
> This doesn't work too.  It seems `Info-on-current-buffer' was created
> exactly for the purpose to be associated with .info in auto-mode-alist.
> It is not used anywhere else.

That doesn't work either: even if the file is editable, the buffer is read-only.

It should be something like:

(lambda ()
   (let ((Info-enable-edit buffer-read-only))
     (Info-on-current-buffer)
     (when Info-enable-edit
       (Info-edit))))

-- 
Kevin Rodgers
Denver, Colorado, USA

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Juri Linkov]

> That doesn't work either: even if the file is editable,
> the buffer is read-only.
>
> It should be something like:
>
> (lambda ()
>   (let ((Info-enable-edit buffer-read-only))
>     (Info-on-current-buffer)
>     (when Info-enable-edit
>       (Info-edit))))

Definitely not.  `Info-edit' is not recommended to use according
to the docstring of `Info-enable-edit'. It is disabled by default.
Your code overrides its default value.

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

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Kevin Rodgers]

Juri Linkov wrote:
>> That doesn't work either: even if the file is editable,
>> the buffer is read-only.
>>
>> It should be something like:
>>
>> (lambda ()
>>   (let ((Info-enable-edit buffer-read-only))
>>     (Info-on-current-buffer)
>>     (when Info-enable-edit
>>       (Info-edit))))

Oops, I meant (let ((Info-enable-edit (not buffer-read-only)) ...)

> Definitely not.  `Info-edit' is not recommended to use according
> to the docstring of `Info-enable-edit'. It is disabled by default.

That is a good default, because normally one is viewing an Info file via
`C-h i' (including `C-u C-h i').  But if one has explicitly visited a file
via `find-file' and friends, then The Full Power of Emacs Shall Be at Your
Fingertips.  :-)

> Your code overrides its default value.

Only temporarily.

-- 
Kevin Rodgers
Denver, Colorado, USA

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Stefan Monnier]

> That doesn't work either: even if the file is editable, the buffer is
> read-only.

That's not necessarily a problem.  Several major modes put their buffer
in a read-only mode even if the underlying file is writable.  This is
typically the case for modes that change the appearance of the buffer
(use things like after-string and display properties).

I think in the case of Info buffers, it's perfectly OK to open them in
read-only mode even if the file is writable.


        Stefan

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Juri Linkov]

>> This doesn't work too.  It seems `Info-on-current-buffer' was created
>> exactly for the purpose to be associated with .info in auto-mode-alist.
>> It is not used anywhere else.
>
> Yes, I wrote Info-on-current-buffer specifically for this kind of use,
> but no it doesn't work for the auto-mode-alist, really.
> There is no good reason why it can't work for auto-mode-alist, but it's
> the way it currently is.  Patches welcome,

I see only one problem with using Info-on-current-buffer for the
auto-mode-alist.  Since it can't read the node name interactively,
it defaults to `Top' that may be missing in the current file of the
multi-file Info manual.  Perhaps it should default to the first node of
the current file.

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

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Chong Yidong]

usr.gentoo@googlemail.com writes:

> when visiting .info files in Emacs via find-file Emacs opens the file
> in the default major-mode instead of Emacs' info-mode.

I think it would be a bad idea to open in Info mode, since one
occasionally comes across plain text files with the .info extension.
Anyway, we have the `info-display-manual' command for this now.
Closing.

bug#5658: 23.1; Viewing .info files in Emacs' info-viewer

[Eli Zaretskii]

> From: Chong Yidong <cyd@gnu.org>
> Date: Sat, 08 Dec 2012 11:37:07 +0800
> Cc: 5658@debbugs.gnu.org
> 
> Anyway, we have the `info-display-manual' command for this now.

To say nothing about "C-u C-h i", which we had for ages.