[libvirt] [PATCH] build: fix gitignore sorting

[Laine Stump]

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.
> ---
>
> * .gnulib dec3475...f796520 (7):
>    >  bootstrap: compute gnulib_extra_files after updating build_aux
>    >  bootstrap: preserve git whitelist item sorting
>    >  maint.mk: Don't trigger sc_space_tab check.
>    >  areadlink, areadlinkat: rewrite in terms of careadlinkat
>    >  autoupdate
>    >  wmemchr, wcschr, wcsrchr, wcspbrk, wcsstr: Avoid errors in C++ mode.
>    >  wcpcpy, wcpncpy: Ensure declaration on glibc>= 2.13 systems.
>
> I'm also trying to patch 'man gitignore' with things I've learned
> from this exercise: http://marc.info/?t=130203248100003&r=1&w=2
>
>   .gitignore                  |   12 +++++-----
>   .gnulib                     |    2 +-
>   bootstrap                   |   46 +++++++++++++++++++++++++++++--------------
>   m4/virt-compile-warnings.m4 |    8 +++---
>   4 files changed, 42 insertions(+), 26 deletions(-)

ACK (once Eric explained the sed construct I'd never seen before :-)

> +# Ensure that lines starting with ! sort last, per gitignore conventions
> +# for whitelisting exceptions after a more generic blacklist pattern.
> +sort_patterns() {
> +  sort -u "$@" | sed '/^!/ {
> +    H
> +    d
> +  }
> +  $ {
> +    P
> +    x
> +    s/^\n//
> +  }'
> +}

Yeah, that's the one...