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39102: __git_recent_branches: Optimise. 

This improves performance from 0.6s to 0.04s (+93%) on one of Daniel Hahler's repositories.
This commit is contained in:
Daniel Shahaf 2016-08-25 00:59:08 +00:00
parent 4d995160e4
commit 317c96b64f
2 changed files with 27 additions and 18 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2016-08-25 Daniel Shahaf <d.s@daniel.shahaf.name>
* 39102: Completion/Unix/Command/_git: __git_recent_branches:
Optimise.
2016-08-24 Daniel Shahaf <d.s@daniel.shahaf.name>
* 39094: Completion/Unix/Command/_git: _git-config: When an

40
Completion/Unix/Command/_git
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@ -6054,35 +6054,39 @@ __git_recent_branches__names()
#
# See workers/38592 for an equivalent long-hand implementation, and the rest
# of that thread for why this implementation was chosen instead.
#
# Note: since we obtain the "from" part of the reflog, we only obtain heads, not tags.
reply=(${${(u)${${(0)"$(_call_program reflog git reflog -1000 -z --grep-reflog='\^checkout:\ moving\ from\ ' --pretty='%gs')"}#checkout: moving from }%% *}:#[[:xdigit:]](#c40)})
}
(( $+functions[__git_recent_branches] )) ||
__git_recent_branches() {
local -a branches descriptions
local branch description
local -a reply
local -aU valid_ref_names_munged=( ${"${(f)"$(_call_program valid-ref-names 'git for-each-ref --format="%(refname)" refs/heads/ refs/tags/')"}"#refs/(heads|tags)/} )
__git_recent_branches__names \
; for branch in $reply
do
# ### We'd want to convert all $reply to $descriptions in one shot,
# ### with this:
# ### array=("${(ps:\0:)"$(_call_program descriptions git --no-pager log --no-walk=unsorted -z --pretty=%s ${(q)reply} --)"}")
# ### , but git croaks if any of the positional arguments is a ref name
# ### that has been deleted. (So does 'git rev-parse'.)
# ### Hence, we resort to fetching the descriptions one-by-one.
# ### This would be costly if fork() is expensive.
description="$(_call_program description git --no-pager log --no-walk=unsorted --pretty=%s ${(q)branch} --)"
# 1. Obtain names of recently-checked-out branches from the reflog.
# 2. Remove ref names that that no longer exist from the list.
# (We must do this because #3 would otherwise croak on them.)
__git_recent_branches__names; branches=( ${(@)reply:*valid_ref_names_munged} )
# If the ref has been deleted, $description would be empty.
if [[ -n "$description" ]]; then
branches+=$branch
descriptions+="${branch//:/\:}:${description}"
fi
# 3. Obtain log messages for all of them in one shot.
descriptions=( ${(f)"$(_call_program all-descriptions git --no-pager log --no-walk=unsorted --pretty=%s ${(q)branches} --)"} )
if (( $#branches != $#descriptions )); then
# ### Trouble...
zle -M "__git_recent_branches: \$#branches != \$#descriptions"
return 1
fi
# 4. Synthesize the data structure _describe wants.
local -a branches_colon_descriptions
local branch description
for branch description in ${branches:^descriptions} ; do
branches_colon_descriptions+="${branch//:/\:}:${description}"
done
_describe -V -t recent-branches "recent branches" descriptions branches
_describe -V -t recent-branches "recent branches" branches_colon_descriptions
}