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zimfw/modules/git/functions/git_current_branch

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# slightly modified git_current_branch from oh-my-zsh for theme compatibility
local ref
ref=$(command git symbolic-ref --quiet HEAD 2> /dev/null)
local ret=$?
if [[ $ret != 0 ]]; then
[[ $ret == 128 ]] && return # no git repo.
ref=$(command git rev-parse --short HEAD 2> /dev/null) || return
fi
print ${ref#refs/heads/}