zshfunc/vcs-info/VCS_INFO_git_getbranch


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VCS_INFO_git_getbranch () { #{{{
    local gitbranch gitdir=$1
    local gitsymref='git symbolic-ref HEAD'

    if    [[ -d "${gitdir}/rebase-apply" ]] \
       || [[ -d "${gitdir}/rebase" ]]       \
       || [[ -d "${gitdir}/../.dotest" ]]   \
       || [[ -f "${gitdir}/MERGE_HEAD" ]] ; then
        gitbranch="$(${(z)gitsymref} 2> /dev/null)"
        [[ -z ${gitbranch} ]] && [[ -r ${gitdir}/rebase-apply/head-name ]] \
            && gitbranch="$(< ${gitdir}/rebase-apply/head-name)"

    elif   [[ -f "${gitdir}/rebase-merge/interactive" ]] \
        || [[ -d "${gitdir}/rebase-merge" ]] ; then
        gitbranch="$(< ${gitdir}/rebase-merge/head-name)"

    elif   [[ -f "${gitdir}/.dotest-merge/interactive" ]] \
        || [[ -d "${gitdir}/.dotest-merge" ]] ; then
        gitbranch="$(< ${gitdir}/.dotest-merge/head-name)"

    else
        gitbranch="$(${(z)gitsymref} 2> /dev/null)"

        if [[ $? -ne 0 ]] ; then
            gitbranch="$(git describe --exact-match HEAD 2>/dev/null)"

            if [[ $? -ne 0 ]] ; then
                gitbranch="${${"$(< $gitdir/HEAD)"}[1,7]}..."
            fi
        fi
    fi

    printf '%s' "${gitbranch##refs/heads/}"
    return 0
}