On Sat, Nov 17, 2012 at 8:33 PM, Felipe Contreras
<felipe.contreras@xxxxxxxxx> wrote:
> On Sat, Nov 17, 2012 at 3:12 PM, SZEDER Gábor <szeder@xxxxxxxxxx> wrote:
>> On Sat, Nov 17, 2012 at 12:42:38PM +0100, Felipe Contreras wrote:
>>> 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.
>>
>> This patch didn't aim for more optimization, but it was definitely a
>> goal not to waste what we gained by creating __gitcomp_nl() in
>> a31e6262 (completion: optimize refs completion, 2011-10-15). However,
>> as it turns out the new version with awk is actually faster than
>> current master with compgen:
>>
>> Before:
>>
>> $ refs="$(for i in {0..9999} ; do echo branch$i ; done)"
>> $ time __gitcomp_nl "$refs"
>>
>> real 0m0.242s
>> user 0m0.220s
>> sys 0m0.028s
>>
>> After:
>>
>> $ time __gitcomp_nl "$refs"
>>
>> real 0m0.109s
>> user 0m0.096s
>> sys 0m0.012s
>
> This one is even faster:
>
> while read -r x; do
> if [[ "$x" == "$3"* ]]; then
> COMPREPLY+=("$2$x$4")
> fi
> done <<< $1
>
> == 10000 ==
> one:
> real 0m0.148s
> user 0m0.134s
> sys 0m0.025s
> two:
> real 0m0.055s
> user 0m0.054s
> sys 0m0.000s
Ah, nevermind, I didn't quote the $1.
However, this one is quite close and much simpler:
local IFS=$'\n'
COMPREPLY=($(printf -- "$2%s$4\n" $1 | grep "^$2$3"))
== 10000 ==
awk 1:
real 0m0.064s
user 0m0.062s
sys 0m0.003s
printf:
real 0m0.069s
user 0m0.064s
sys 0m0.020s
--
Felipe Contreras
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