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Re: odt file instant open

From: Andreas Röhler
Subject: Re: odt file instant open
Date: Tue, 27 Jul 2010 19:34:01 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; de; rv: Gecko/20100711 Thunderbird/3.0.6

Am 27.07.2010 18:58, schrieb Eli Zaretskii:
Date: Tue, 27 Jul 2010 09:30:32 +0200
From: Andreas Röhler<address@hidden>

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.


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


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