brew-shadow

# shellcheck shell=bash
bsl_debug=0

_date()
{
    date '+%Y-%m-%d--%H-%M-%S'
}

_brew-shadow-load()
{
    pkg="$1"
    [ -z "${pkg}" ] && { echo "Usage: brew-shadow [init|load] pkg"; return 1; }

    _env="${HOME}/sh/brew.d/${pkg}/vars.env" 
    echo "check for $_env"
    if [ -f "${_env}" ] ; then
        _tmp_env="/tmp/bsl-${pkg}.$$"
        echo "source ${HOME}/.bashrc" > $_tmp_env
        cat "${_env}" >> "${_tmp_env}"
        echo "export PS1=\"[[brew-${pkg}]] $PS1\"" >> "${_tmp_env}"
        /usr/local/bin/bash  --rcfile "${_tmp_env}"
        rm -f "${_tmp_env}"
    fi
}


_brew-shadow-init()
{
    _saved_no_color="${HOMEBREW_NO_COLOR}"
    export HOMEBREW_NO_COLOR="NO_COLOR"
    pkg="${1}"
    [ -z "${pkg}" ] && { echo "Usage: brew-shadow [init|load] pkg"; return 1; }

    out="/tmp/bsl.$$"
    brew link "${pkg}" > "${out}" 2>&1 
    if grep -q "^Error:.*No such keg" "${out}" ; then
        echo "keg ${pkg} not found by homebrew!  Aborting."
        return 2
    fi


    sh_homedir="${HOME}/sh/brew.d/${pkg}"
    if [ -e "${sh_homedir}" ] ; then
        sh_homedir_backup="${sh_homedir}/${pkg}-$(_date)"
        [ ! -d "${sh_homedir_backup}" ] && mkdir -v -p "${sh_homedir_backup}"
        echo "${sh_homedir} exists - mv'ing to ${sh_homedir_backup}"
        mv -v "${sh_homedir}" "${sh_homedir_backup}"
    fi
    mkdir -v -p "${sh_homedir}"

    if grep -q "^Warning: Refusing to link.*shadowed" ${out} ; then
        echo "Setting up shadowed config files..." 
        grep "^[        ]*export " "${out}" | gsed 's/^[ \t]\+//'  > "${sh_homedir}/vars.env"
        awk "/^\s+echo\s+'export/  {  _path=\$3; gsub(/'\$/, \"\", _path);  printf(\"export %s\n\", _path); }" "$out" >> "${sh_homedir}/vars.env"
        if [ $bsl_debug -gt 0 ] ; then
            echo "sh files will live in ${sh_homedir}.."
            if [ "${bsl_debug}" -gt 1 ] ; then  
                echo "the default brew output from which we parsed values -" 
                cat "${out}"
            fi
        fi
    fi
    export HOMEBREW_NO_COLOR="${_saved_no_color}"
    rm -f "${out}"
}

brew-shadow()
{
    action="$1"
    pkg="$2"

    [ -z "${pkg}" ] && { echo "Usage: __brew-shadow [init|load] pkg"; return 1; }

    [[ "${action}" == "init" ]] && _brew-shadow-init "${pkg}" || [[ "${action}" == "load" ]] && _brew-shadow-load "${pkg}" 

    return $?
}



# vim:ts=4:sts=4:ai:et:syntax=sh:ft=sh: