function brew-list-with {
  brew list \
    | xargs -P "$(getconf _NPROCESSORS_ONLN)" -I {} brew info {} \
    | grep -B 1 -E '^  Built.*with:'
}

function brew-deps {
    (
    brew deps --include-build "$1"
    brew deps --installed "$1"
  ) | sort -u
}
export -f brew-deps

function brew-leaves {
    comm -13 \
    <(
        brew list \
      | xargs -P "$(getconf _NPROCESSORS_ONLN)" -I {} bash -c "brew-deps {}" \
      | sort -u
    ) \
    <(brew list | sort)
}

function brew-trim {
    dirty='0'
    for package in $(brew-leaves)
    do
        read -r -p "Uninstall $package [y/N]" uninstall
        if [ "$uninstall" == 'y' ]
        then
            dirty='1'
            brew uninstall "$package"
        fi
    done

    if [ "$dirty" != '0' ]
    then
        echo 'Redoing with the (potentially) new leaves!'
        brew-trim
    fi
}

function brew-reinstall-order {
  brew list \
      | xargs -P "$(getconf _NPROCESSORS_ONLN)" -I {} bash -a -c 'echo {} $(brew-deps {} | tr "\r\n" " ")' \
    | awk 'NF == 1 {print $1, $1} NF > 1 {for (i = 1; i <= NF; i++) print $1, $i}' \
    | tsort \
    | tail -r
}

function brew-dist-upgrade {
  (
    set +e
    for reinstallable in $(brew-reinstall-order)
    do
      brew reinstall "$reinstallable"
    done
  )
}

function brew-upgrade {
    brew update
    brew outdated
    read -r -p 'Enter to go, ^C to not go'
    (
        set +e
        brew upgrade
        brew cleanup -s
        brew prune
        brew tap --repair
    )
    brew doctor
}