automatically include files in %doc only if they are not empty

[Till Maas]

On Thu November 27 2008, Michael Schwendt wrote:
> On Thu, 27 Nov 2008 12:55:07 +0100, Till Maas wrote:

> > on a package I recently packaged for Fedora, there is an empty TODO file
> > included. Is there an easy way to mark this file in %files to be included
> > only if it is not empty? This would make it easier to not forget to add
> > the file in case it will be filed with some contents in a future release.
>
> %prep and %check : easy enough to add a bash conditional expression
> (e.g. which exits with failure if the file exists and has a size greater
> than zero -- or the opposite, a zero size, for files you want to exclude).

I would like to avoid breaking the build in this case. I hoped there was some 
macro, e.g. named exclude_empty, that would allow to exclude files only if 
they are empty. This is what I came up with:

%define exclude_empty() %(test -s %1 && echo %1)

It should then be used somehow like this:
%files
%doc %exclude_empty TODO

But it seems to always exclude the file.

Regards,
Till
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