Re: odt file instant open

[Andreas Röhler]

Am 27.07.2010 18:58, schrieb Eli Zaretskii:
> > Date: Tue, 27 Jul 2010 09:30:32 +0200
> > From: Andreas Röhler<andreas.roehler@easy-emacs.de>
> >
> > Am 26.07.2010 18:29, schrieb Olwe Melwasul:
> > > I'm trying to grok the open document format, so I took the first wild
> > > and crazy step of simply trying to open it in Emacs (23.2.1) -- and it
> > > opened up to a "Zip-Archive Narrow" view of all the files contained
> > > therein Poking around on the Internet, I found that Emacs
> > > automatically unpacks a .odt file, which is nothing more than a zip
> > > file. My question is this: How is Emacs doing this?
> >
> > by calling a shell-command resp. to the ending found.
>
> No.  For most archive types, arc-mode.el (and tar-mode.el) can list
> the contents directly, just by reading the archive file itself.
> Extracting the individual files in the archive sometimes needs to run
> an external program.

Hi,

think you mistook the question.
As the OP wrote, he just opened the file without any precaution. The 
surprise was: it worked.

Ignoring so for how opening was done in detail --via find-file or from 
dired probably-- arc-mode seems not involved, but auto-compression-mode 
from jka-cmpr-hook.el etc.

BTW arc-mode too recurs to shell-commands AFAIS,
          (apply 'call-process
in archive-*-extract for example

Andreas