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@xxxxxxxxxx +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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