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Re: Index files autocompletion too slow in big repositories (w / suggestion for improvement)




On Fri, Apr 14, 2017 at 3:33 PM, Ævar Arnfjörð Bjarmason
<avarab@xxxxxxxxx> wrote:
> On Sat, Apr 15, 2017 at 12:08 AM, Carlos Pita <carlosjosepita@xxxxxxxxx> wrote:
>> This is much faster (below 0.1s):
>>
>> __git_index_files ()
>> {
>>     local dir="$(__gitdir)" root="${2-.}" file;
>>     if [ -d "$dir" ]; then
>>         __git_ls_files_helper "$root" "$1" | \
>>             sed -r 's@/.*@@' | uniq | sort | uniq
>>     fi
>> }
>>
>> time __git_index_files
>>
>> real    0m0.075s
>> user    0m0.083s
>> sys    0m0.010s
>>
>> Most of the improvement is due to the simpler, non-grouping, regex.
>> Since I expect most of the common prefixes to arrive consecutively,
>> running uniq before sort also improves things a bit. I'm not removing
>> leading double quotes anymore (this isn't being done by the current
>> version, anyway) but this doesn't seem to hurt.
>>
>> Despite the dependence on sed this is ten times faster than the
>> original, maybe an option to enable fast index completion or something
>> like that might be desirable.
>>
>> Best regards
>
> It's fine to depend on sed, these shell-scripts are POSIX compatible,
> and so is sed, we use sed in a lot of the built-in shellscripts.
>
> I think you should submit this as a patch, see Documentation/SubmittingPatches.

Yea it should be fine to use sed.

Thanks,
Jake