From: SZEDER Gábor <szeder.dev@gmail.com>
Date: Thu, 23 Mar 2017 15:29:19 +0000 (+0100)
Subject: completion: let 'for-each-ref' strip the remote name from remote branches
X-Git-Tag: v2.13.0-rc0~46^2~5
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/e8cb02343310dbc5fea4df59cb349402dfcf7df1?hp=e8cb02343310dbc5fea4df59cb349402dfcf7df1

completion: let 'for-each-ref' strip the remote name from remote branches

The code listing unique remote branches for 'git checkout's tracking
DWIMery uses a shell parameter expansion in a loop iterating over each
listed ref to remove the remote's name from the remote branches, i.e.
the leading path component from the short ref.  When listing refs from
a configured remote repository, '| sed s///' is used for the same
purpose.

Let 'git for-each-ref' strip one more leading path component from the
refs, i.e. use the format 'refname:strip=3' instead of '=2', making
that parameter expansion and 'sed' execution unnecessary.

This speeds up refs completion for 'git checkout'.  Uniquely
completing a branch for 'git checkout maste<TAB>' in a repo with 100k
remote branches, all packed, best of five:

On Linux, near the beginning of this series, for reference:

$ time __git_complete_refs --cur=maste --track

real    0m8.185s
user    0m6.896s
sys     0m1.616s

Before this patch:

real    0m2.714s
user    0m2.344s
sys     0m0.436s

After:

real    0m1.993s
user    0m1.740s
sys     0m0.304s

On Windows, near the beginning:

real    1m8.421s
user    0m7.591s
sys     0m3.557s

Before this patch:

real    0m8.191s
user    0m4.638s
sys     0m2.918s

After:

real    0m6.187s
user    0m3.358s
sys     0m2.121s

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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