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.zsh/functions/update_current_git_vars

unset __CURRENT_GIT_BRANCH
unset __CURRENT_GIT_BRANCH_STATUS
unset __CURRENT_GIT_BRANCH_IS_DIRTY

local st="$(git status 2>/dev/null)"
local st2="$(git log -1 --pretty=%h 2>/dev/null)"

if [[ -n "$st" ]]; then
    local -a arr
    arr=(${(f)st})

    if [[ $arr[1] =~ 'Not currently on any branch.' ]]; then
        __CURRENT_GIT_BRANCH="$st2"
    else
        __CURRENT_GIT_BRANCH="${arr[1][(w)4]}";
    fi

    if [[ $arr[2] =~ 'Your branch is' ]]; then
        if [[ $arr[2] =~ 'ahead' ]]; then
            __CURRENT_GIT_BRANCH_STATUS='ahead'
        elif [[ $arr[2] =~ 'diverged' ]]; then
            __CURRENT_GIT_BRANCH_STATUS='diverged'
        else
            __CURRENT_GIT_BRANCH_STATUS='behind'
        fi
    fi

    if [[ ! $st =~ 'nothing to commit' ]]; then
        __CURRENT_GIT_BRANCH_IS_DIRTY='1'
    fi
fi