Re: [libvirt] [PATCH] build: fix gitignore sorting
On 04/07/2011 01:26 PM, Laine Stump wrote:
On 04/05/2011 06:51 PM, Eric Blake wrote:
> Make it so we don't have to 'git add -f' particular files like
> po/POTFILES.in all the time (tested by fixing one of our
> special-case files as part of the patch).
>
> * .gnulib: Update to latest.
> * bootstrap: Resync from coreutils.
> * .gitignore: Sort whitelist entries correctly, including ignoring
> files rather than directories.
> * m4/virt-compile-warnings.m4: Convert tabs to space.
> ---
ACK (once Eric explained the sed construct I'd never seen before :-)
Thanks; pushed.
> +# Ensure that lines starting with ! sort last, per gitignore conventions
> +# for whitelisting exceptions after a more generic blacklist pattern.
> +sort_patterns() {
> + sort -u "$@" | sed
Sed has two buffers - the pattern space (which gets printed for every
line of input unless it is empty) and the hold space (which is used for
scratch work).
'/^!/ {
> + H
> + d
> + }
For all lines that start with !, append a newline and that line into the
hold space, then delete the line from the pattern space (so skip
printing ! lines the first time through).
> + $ {
> + P
> + x
> + s/^\n//
> + }'
On the last line, print the line like normal, then exchange pattern and
buffer spaces, remove the extra leading newline that got put in the hold
space on the first ! line, then print all the deferred ! lines.
Yeah, that's the one...
I don't blame you for asking - sed's got some pretty arcane (but cool)
features.
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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