From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bastien <bzg@gnu.org>
Subject: Re: Bug: Setting system command org-file-apps does not allow other
 settings to refer to it [8.2.5h (release_8.2.5h-620-g7fd183 @
 /home/rrt/.emacs.d/el-get/package/elpa/org-20140210/)]
Date: Wed, 23 Apr 2014 17:04:35 +0200
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	(Reuben Thomas's message of "Wed, 23 Apr 2014 14:29:44 +0100")
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To: Reuben Thomas <rrt@sc3d.org>
Cc: emacs-orgmode@gnu.org

Hi Reuben,

Reuben Thomas <rrt@sc3d.org> writes:

> Value: ((auto-mode . emacs)
>  ("\\.mm\\'" . default)
>  ("\\.x?html?\\'" . default)
>  ("\\.pdf\\'" . default)
>  (t . "xdg-open %s")
>  (system . "xdg-open %s"))
>  
>
>     What I've found is that, since .pdf documents can be opened in
>     Emacs
>     and since org-file-apps contains (auto-mode . emacs) as its first
>     element, then changing the system's value to xdg-open after that
>     will
>     fail because (auto-mode . emacs) is applied first.
>
>
> That's interesting, but I'm no less confused. With the value above,
> PDF files *are* opened with xdg-open.

Okay, see those two bits of `org-file-apps' docstring:

`auto-mode'    Matches files that are matched by any entry in `auto-mode-alist',
               so all files Emacs knows how to handle.  Using this with
               command `emacs' will open most files in Emacs.  Beware that this
               will also open html files inside Emacs, unless you add
               ("html" . default) to the list as well.
               
So (auto-mode . emacs) says to open .pdf files in emacs... but 
("\\.pdf\\'" . default) says to open .pdf files using the "default"
application:

 `default'     Use the default application for this file type, which is the
               association for t in the list

Since you have (t . "xdg-open %s"), xdg-open is used.

Yep, it's all a bit tricky...

-- 
 Bastien