Re: [RFC/PATCH 4/5] completion: get rid of compgen

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On Sat, Nov 17, 2012 at 12:00 PM, SZEDER Gábor <szeder@xxxxxxxxxx> wrote:
> On Sat, Nov 17, 2012 at 02:38:17AM +0100, Felipe Contreras wrote:
>> The functionality we use is very simple, plus, this fixes a known
>> breakage 'complete tree filename with metacharacters'.
>>
>> Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
>> ---
>>  contrib/completion/git-completion.bash | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
>> index 975ae13..ad3e1fe 100644
>> --- a/contrib/completion/git-completion.bash
>> +++ b/contrib/completion/git-completion.bash
>> @@ -227,7 +227,11 @@ fi
>>
>>  __gitcompadd ()
>>  {
>> -     COMPREPLY=($(compgen -W "$1" -P "$2" -S "$4" -- "$3"))
>> +     for x in $1; do
>> +             if [[ "$x" = "$3"* ]]; then
>> +                     COMPREPLY+=("$2$x$4")
>> +             fi
>> +     done
>
> The whole point of creating __gitcomp_nl() back then was to fill
> COMPREPLY without iterating through all words in the wordlist, making
> completion faster for large number of words, e.g. a lot of refs, or
> later a lot of symbols for 'git grep' in a larger project.
>
> The loop here kills that optimization.

So your solution is to move the loop to awk? I fail to see how that
could bring more optimization, specially since it includes an extra
fork now.

-- 
Felipe Contreras
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