Support of csv files with .xls extension

[Kohei Yoshida]

On Thu, 2013-10-24 at 10:38 +0300, Maxim Monastirsky wrote:
> Hi All,
> Starting with 4.1 csv files with xls extension & also tsv files are opened using 
> writer instead of calc, when opening from the start center or from cli without 
> '--calc'. While it's clear that the tsv part should be fixed (BTW it's a 
> trivial fix [1]), I'm not sure about csv files with xls extension. Users 
> shouldn't expect that after changing the file extension to some random 
> extension, it still would be recognized as a csv by default. But on the other 
> hand the fact that some user opened a bug for it, might indicate that some 
> app\web app generates such files. So what do you think? Should it be fixed, or 
> should we close the bug as WONTFIX?
> 
> The relevant bug reports are:
> https://bugs.freedesktop.org/show_bug.cgi?id=68903 (csv with .xls extension)
> https://bugs.freedesktop.org/show_bug.cgi?id=69290 (tsv)

Well, when the app name is not given, the current detection code relies
on the extension to decide which app to open the file with (as you
already noticed).  I believe we associate "csv" to Calc in this case, 

http://cgit.freedesktop.org/libreoffice/core/tree/filter/source/textfilterdetect/filterdetect.cxx#n75

so I would say it's also reasonable to associate "tsv" and "xls" to Calc
as well.

Feel free to propose a patch for this and push it to gerrit.  It should
be a very easy fix.

Kohei