#!/usr/bin/env bash
# mac-toolchain-build - download and build common macOS toolchain components
#
# Copyright 2020 Bradley Sepos
# Released under the MIT License. See LICENSE for details.
# https://github.com/bradleysepos/mac-toolchain-build

# checks for required external tools
function check_dependencies {  # check_dependencies $DEP1 $DEP2 ...
    local DEPS DEPS_EACH DEPS_MULTI ERRORS FOUND
    DEPS=("${@}");
    ERRORS=()
    for DEPS_EACH in ${DEPS[@]}; do
        DEPS_MULTI=(${DEPS_EACH//|/ })
        FOUND=false
        for DEP in ${DEPS_MULTI[@]}; do
            if echo "${DEP}" | grep '/' >/dev/null 2>&1 && [[ -x "${DEP}" ]]; then
                FOUND=true
                break
            elif hash "${DEP}" >/dev/null 2>&1; then
                FOUND=true
                break
            fi
        done
        if [[ "${FOUND}" == false ]]; then
            ERRORS+=("$(echo ${DEPS_MULTI[@]} | sed 's/ /|/')")
        fi
    done
    if [[ "${#ERRORS[@]}" -ne 0 ]]; then
        echo "dependencies: ${DEPS[@]}"
        echo "unable to find command(s): ${ERRORS[*]}" >&2
        return 1
    fi
}

# checks version is greater than or equal to target version
function check_version_gte {  # check_version_gte $VERSION $TARGET
    if [[ "${1:-}" == "${2:-}" ]]; then
        return 0
    fi
    local VERSION TARGET INDEX
    IFS='.' read -r -a VERSION <<< "${1:-}"
    IFS='.' read -r -a TARGET <<< "${2:-}"
    for ((INDEX=${#VERSION[@]}; INDEX<${#TARGET[@]}; INDEX++)); do
        VERSION[INDEX]=0
    done
    for ((INDEX=0; INDEX<${#VERSION[@]}; INDEX++))
    do
        if [[ -z ${TARGET[INDEX]} ]]; then
            TARGET[INDEX]=0
        fi
        if ((10#${VERSION[INDEX]} > 10#${TARGET[INDEX]})); then
            return 0
        fi
        if ((10#${VERSION[INDEX]} < 10#${TARGET[INDEX]})); then
            return 1
        fi
    done
    return 0
}

# downloads from one or more urls
function download_url {  # download_url $VERBOSE $FILE $URLS
    local VERBOSE FILE URLS I FAILED
    OPTIND=1
    VERBOSE="${1}"
    FILE="${2}"
    shift 2
    URLS=("${@}")
    if [[ "${#URLS[@]}" -eq 0 ]] || [[ "${URLS[0]:-}" == "" ]]; then
        echo "url not specified for download" >&2
        return 1
    fi
    if [[ "${FILE:-}" == "" ]]; then
        echo "output path not specified for download: ${FILE}" >&2
        return 1
    fi
    FAILED=()
    for I in "${!URLS[@]}"; do
        if ! curl --head -Lf --connect-timeout 30 "${URLS[I]}" >/dev/null 2>&1; then
            FAILED+=("${URLS[I]}")
            if [[ "$(( ${I} + 1 ))" -lt "${#URLS[@]}" ]]; then
                continue
            else
                echo "unable to download from urls: ${FAILED[@]}" >&2
                echo "unable to download to file: ${FILE}" >&2
                return 1
            fi
        fi
        if ! touch "${FILE}" >/dev/null 2>&1; then
            echo "unable to create path: ${FILE}" >&2
            return 1
        fi
        if [[ "${VERBOSE:-}" == true ]]; then
            echo "curl -Lf --connect-timeout 30 \"${URLS[I]}\" -o \"${FILE}\""
        fi
        if ! curl -Lf --connect-timeout 30 "${URLS[I]}" -o "${FILE}" >/dev/null 2>&1; then
            FAILED+=("${URLS[I]}")
            if [[ "$(( ${I} + 1 ))" -lt "${#URLS[@]}" ]]; then
                continue
            else
                echo "unable to download from urls: ${FAILED[@]}" >&2
                echo "unable to download to file: ${FILE}" >&2
                return 1
            fi
        fi
    done
}

# prints continuous output to avoid timeouts on build systems like Travis
function display_progress {
    local str=""
    while [ "$(ps a | awk '{print $1}' | grep ${1})" ]; do
        printf "%c" "$str"
        sleep 5
        str="."
    done
}

# kills child processes
function die_gracefully {
    trap - EXIT INT
    trap ":" INT  # prevent recursion due to spamming ctrl-c
    echo ""
    echo "logs and temporary files may exist at ${TMPDIR%/}/mac-toolchain-build-*" >&2
    trap - TERM && kill -- -$$
}

# tests whether a string is an exact match for an array item
function in_array {  # in_array needle haystack[@]
    local e
    for e in "${@:2}"; do
        [[ "${e}" == "${1}" ]] && return 0
    done
    return 1
}

# builds toolchain components
function mac_toolchain_build {
    set -o pipefail

    # package names
    local AUTOCONF_NAME AUTOMAKE_NAME CMAKE_NAME LIBTOOL_NAME MESON_NAME NASM_NAME NINJA_NAME PKGCONFIG_NAME NAMES
    AUTOCONF_NAME="autoconf"
    AUTOMAKE_NAME="automake"
    CMAKE_NAME="cmake"
    LIBTOOL_NAME="libtool"
    MESON_NAME="meson"
    NASM_NAME="nasm"
    NINJA_NAME="ninja"
    PKGCONFIG_NAME="pkg-config"
    NAMES=("${AUTOCONF_NAME}" "${AUTOMAKE_NAME}" "${CMAKE_NAME}" "${LIBTOOL_NAME}" "${MESON_NAME}" "${NASM_NAME}" "${NINJA_NAME}" "${PKGCONFIG_NAME}")

    # versions
    local AUTOCONF_VER AUTOMAKE_VER CMAKE_VER LIBTOOL_VER MESON_VER NASM_VER NINJA_VER PKGCONFIG_VER VERSIONS
    AUTOCONF_VER="2.69"
    AUTOMAKE_VER="1.16.2"
    CMAKE_VER="3.18.0"
    LIBTOOL_VER="2.4.6"
    MESON_VER="0.55.0"
    NASM_VER="2.15.03"
    NINJA_VER="1.10.0"
    PKGCONFIG_VER="0.29.2"
    VERSIONS=("${AUTOCONF_VER}" "${AUTOMAKE_VER}" "${CMAKE_VER}" "${LIBTOOL_VER}" "${MESON_VER}" "${NASM_VER}" "${NINJA_VER}" "${PKGCONFIG_VER}")

    # filenames
    local AUTOCONF_PKG AUTOMAKE_PKG CMAKE_PKG LIBTOOL_PKG MESON_PKG NASM_PKG NINJA_PKG PKGCONFIG_PKG PKGS
    AUTOCONF_PKG="autoconf-${AUTOCONF_VER}.tar.gz"
    AUTOMAKE_PKG="automake-${AUTOMAKE_VER}.tar.gz"
    CMAKE_PKG="cmake-${CMAKE_VER}.tar.gz"
    LIBTOOL_PKG="libtool-${LIBTOOL_VER}.tar.gz"
    MESON_PKG="meson-${MESON_VER}.tar.gz"
    NASM_PKG="nasm-${NASM_VER}.tar.bz2"
    NINJA_PKG="ninja-${NINJA_VER}.tar.gz"
    PKGCONFIG_PKG="pkg-config-${PKGCONFIG_VER}.tar.gz"
    PKGS=("${AUTOCONF_PKG}" "${AUTOMAKE_PKG}" "${CMAKE_PKG}" "${LIBTOOL_PKG}" "${MESON_PKG}" "${NASM_PKG}" "${NINJA_PKG}" "${PKGCONFIG_PKG}")

    # urls
    local AUTOCONF_URLS AUTOMAKE_URLS CMAKE_URLS LIBTOOL_URLS MESON_URLS NASM_URLS NINJA_URLS PKGCONFIG_URLS URLS_VARNAMES
    AUTOCONF_URLS=("https://ftp.gnu.org/gnu/autoconf/autoconf-${AUTOCONF_VER}.tar.gz")
    AUTOMAKE_URLS=("https://ftp.gnu.org/gnu/automake/automake-${AUTOMAKE_VER}.tar.gz")
    CMAKE_URLS=("https://cmake.org/files/v${CMAKE_VER%.*}/cmake-${CMAKE_VER}.tar.gz")
    LIBTOOL_URLS=("https://ftp.gnu.org/gnu/libtool/libtool-${LIBTOOL_VER}.tar.gz")
    MESON_URLS=("https://github.com/mesonbuild/meson/archive/${MESON_VER}.tar.gz")
    NASM_URLS=("https://www.nasm.us/pub/nasm/releasebuilds/${NASM_VER}/nasm-${NASM_VER}.tar.bz2")
    NINJA_URLS=("https://github.com/ninja-build/ninja/archive/v${NINJA_VER}.tar.gz")
    PKGCONFIG_URLS=("https://pkg-config.freedesktop.org/releases/pkg-config-${PKGCONFIG_VER}.tar.gz")
    URLS_VARNAMES=('AUTOCONF_URLS' 'AUTOMAKE_URLS' 'CMAKE_URLS' 'LIBTOOL_URLS' 'MESON_URLS' 'NASM_URLS' 'NINJA_URLS' 'PKGCONFIG_URLS')

    # checksums
    local AUTOCONF_SHA256 AUTOMAKE_SHA256 CMAKE_SHA256 LIBTOOL_SHA256 MESON_SHA256 NASM_SHA256 NINJA_SHA256 PKGCONFIG_SHA256 CHECKSUMS
    AUTOCONF_SHA256="954bd69b391edc12d6a4a51a2dd1476543da5c6bbf05a95b59dc0dd6fd4c2969"
    AUTOMAKE_SHA256="b2f361094b410b4acbf4efba7337bdb786335ca09eb2518635a09fb7319ca5c1"
    CMAKE_SHA256="83b4ffcb9482a73961521d2bafe4a16df0168f03f56e6624c419c461e5317e29"
    LIBTOOL_SHA256="e3bd4d5d3d025a36c21dd6af7ea818a2afcd4dfc1ea5a17b39d7854bcd0c06e3"
    MESON_SHA256="9034c943c8cf4d734c0e18e5ba038dd762fcdcc614c45b41703305da8382e90c"
    NASM_SHA256="04e7343d9bf112bffa9fda86f6c7c8b120c2ccd700b882e2db9f57484b1bd778"
    NINJA_SHA256="3810318b08489435f8efc19c05525e80a993af5a55baa0dfeae0465a9d45f99f"
    PKGCONFIG_SHA256="6fc69c01688c9458a57eb9a1664c9aba372ccda420a02bf4429fe610e7e7d591"
    CHECKSUMS=("${AUTOCONF_SHA256}" "${AUTOMAKE_SHA256}" "${CMAKE_SHA256}" "${LIBTOOL_SHA256}" "${MESON_SHA256}" "${NASM_SHA256}" "${NINJA_SHA256}" "${PKGCONFIG_SHA256}")

    # internal vars
    local NAME VERSION SELF SELF_NAME HELP SUDO TOTAL
    NAME="mac-toolchain-build"
    VERSION="2.5.0"
    SELF="${BASH_SOURCE[0]}"
    SELF_NAME=$(basename "${SELF}")
    HELP="\
${NAME} ${VERSION}
usage: ${SELF_NAME} [-h | --help]
       ${SELF_NAME} [-l | --list]
       ${SELF_NAME} [-v | --version]
       ${SELF_NAME} [-f | --force] [-j # | --jobs #] [install-dir]
where:
  -h, --help
        display this help text
  -l, --list
        display components list
  -v, --version
        display version information
  -f, --force
        force installation even if adequate versions of tools are installed
  -j, --jobs
        number of concurrent build jobs to run
        default: 0 (automatic)
default install-dir: /usr/local"
    SUDO=
    TOTAL="${#NAMES[@]}"

    # args
    local FORCE JOBS LIST OPTIND OPTSPEC OPTARRAY PREFIX
    FORCE=false
    JOBS=0
    LIST=false
    OPTIND=1
    OPTSPEC=":-:hlvfj:"
    OPTARRAY=('-h' '--help' '-l' '--list' '-v' '--version' '-f' '--force' '-j' '--jobs')  # all short and long options
    while getopts "${OPTSPEC}" OPT; do
        case "${OPT}" in
            -)
                case "${OPTARG}" in
                    help)
                        # Print help and exit
                        echo -e "${HELP}"
                        return 0
                        ;;
                    help=*)
                        # Print help and exit
                        echo -e "${HELP}"
                        return 0
                        ;;
                    list)
                        # List components
                        LIST=true
                        ;;
                    list=*)
                        # List components
                        LIST=true
                        ;;
                    version)
                        # Print version and exit
                        echo -e "${NAME} ${VERSION}"
                        return 0
                        ;;
                    version=*)
                        # Print version and exit
                        echo -e "${NAME} ${VERSION}"
                        return 0
                        ;;
                    force)
                        # Force installation
                        FORCE=true
                        ;;
                    force=*)
                        # Option with prohibited value
                        echo "Option --${OPTARG%%=*} takes no value" >&2
                        echo -e "${HELP}"
                        return 1
                        ;;
                    jobs)
                        # Number of jobs
                        if [[ -z ${!OPTIND+isset} ]] || in_array "${!OPTIND}" "${OPTARRAY[@]}"; then
                            # Option without required argument
                            echo "Option --${OPTARG} requires a value" >&2
                            echo -e "${HELP}"
                            return 1
                        fi
                        JOBS="${!OPTIND}"
                        if [[ ! "${JOBS}" =~ ^[0-9]*$ ]]; then
                            echo "Option --${OPTARG} requires a numeric value" >&2
                            echo -e "${HELP}"
                            return 1
                        fi
                        OPTIND=$((OPTIND + 1))
                        ;;
                    jobs=*)
                        # Number of jobs
                        JOBS="${OPTARG#*=}"
                        if [[ ! "${JOBS}" =~ ^[0-9]*$ ]]; then
                            echo "Option --${OPTARG} requires a numeric value" >&2
                            echo -e "${HELP}"
                            return 1
                        fi
                        ;;
                    *)
                        if [[ "${OPTERR}" == 1 ]]; then
                            # Invalid option specified
                            echo "Invalid option: --${OPTARG}" >&2
                            echo -e "${HELP}"
                            return 1
                        fi
                        ;;
                esac
                ;;
            h)
                # Print help and exit
                echo -e "${HELP}"
                return 0
                ;;
            l)
                # List components
                LIST=true
                ;;
            v)
                # Print version and exit
                echo "${NAME} ${VERSION}"
                return 0
                ;;
            f)
                # Force installation
                FORCE=true
                ;;
            j)
                # Number of jobs
                JOBS="${OPTARG}"
                if [[ ! "${JOBS}" =~ ^[0-9]*$ ]]; then
                    echo "Option -${OPT} requires a numeric value" >&2
                    echo -e "${HELP}"
                    return 1
                fi
                ;;
            :)
                # Option without required value
                echo "Option -${OPTARG} requires a value" >&2
                echo -e "${HELP}"
                return 1
                ;;
            \?)
                # Invalid option specified
                echo "Invalid option: -${OPTARG}" >&2
                echo -e "${HELP}"
                return 1
                ;;
        esac
    done
    shift $((OPTIND - 1))

    # host
    local SYS_NAME CPU_COUNT
    SYS_NAME=$(uname | awk '{ print tolower($0)}')
    if [[ "${SYS_NAME}" == "darwin" ]]; then
        CPU_COUNT=$(sysctl -n hw.activecpu 2>/dev/null)
    fi
    CPU_COUNT="${CPU_COUNT:-1}"
    [[ "${JOBS}" -eq 0 ]] && JOBS="${CPU_COUNT}"

    # list components
    if [[ "${LIST}" == true ]]; then
        local COMPONENTS COMPONENTS_TEMP
        COMPONENTS_TEMP=()
        for I in "${!NAMES[@]}"; do
            COMPONENTS_TEMP+=("${NAMES[$I]} ${VERSIONS[$I]}")
        done
        OIFS="${IFS}"
        IFS=$'\n'
        COMPONENTS=($(sort <<< "${COMPONENTS_TEMP[*]}"))
        IFS="${OIFS}"
        echo "${NAME} ${VERSION}"
        echo "Components:"
        for I in "${!COMPONENTS[@]}"; do
            echo "  ${COMPONENTS[$I]}"
        done
        return 0
    fi

    # begin output
    echo "${NAME} ${VERSION} (${JOBS} job$([[ ${JOBS} -gt 1 ]] && echo 's'))"

    # mac only
    if [[ "${SYS_NAME}" != "darwin" ]]; then
        echo "macOS/Darwin required" >&2
        return 1
    fi

    # dependencies
    local DEPS
    DEPS=("curl" "python3" "sed" "shasum|sha256sum")
    check_dependencies "${DEPS[@]}" || return 1

    # sha256 binary
    local SHA256
    if hash shasum >/dev/null 2>&1; then
        SHA256="shasum -a 256"
    elif hash sha256sum >/dev/null 2>&1; then
        SHA256="sha256sum"
    else
        return 1
    fi

    # prefix
    PREFIX="${1:-/usr/local}"

    # check installed tool versions, skip if adequate
    local INSTALLED_VERSIONS SKIP NOT_SKIPPED_TOTAL
    INSTALLED_VERSIONS=()
    SKIP=()
    NOT_SKIPPED_TOTAL=0
    for I in "${!NAMES[@]}"; do
        INSTALLED_VERSIONS[$I]=$("${PREFIX}/bin/${NAMES[I]}" --version 2>&1 | head -n 1 | grep -Eo '[0-9]+\.[0-9]+(\.[0-9]+)?' 2>&1 | head -n 1)
        if [[ "${FORCE}" == false ]] && check_version_gte "${INSTALLED_VERSIONS[I]}" "${VERSIONS[I]}"; then
            SKIP[$I]=true
        else
            NOT_SKIPPED_TOTAL=$((NOT_SKIPPED_TOTAL+1))
            SKIP[$I]=false
        fi
    done

    # permissions
    if [[ "${NOT_SKIPPED_TOTAL}" -gt 0 ]]; then
        mkdir -p "${PREFIX}" >/dev/null 2>&1
        if [[ ! -w "${PREFIX}" ]]; then
            if ! sudo -n date >/dev/null 2>&1; then
                echo "sudo is required to install files to ${PREFIX}"
                [[ "${SUDO}" != "" ]] && ${SUDO} -v
            fi
            sudo mkdir -p "${PREFIX}" >/dev/null 2>&1
            if sudo touch "${PREFIX}" >/dev/null 2>&1; then
                SUDO=sudo
            else
                echo "Unable to write to directory: ${PREFIX}" >&2
                return 1
            fi
        fi
    fi
    PREFIX=$(cd "${PREFIX}" && pwd -P)

    # directory creation
    local PKG_DIR SOURCE_DIR BUILD_DIR
    PKG_DIR=$(mktemp -d "${TMPDIR:-/tmp/}mac-toolchain-build-XXXXXX")
    if [[ ! -d "${PKG_DIR}" ]]; then
        echo "unable to create directory: ${PKG_DIR}" >&2
        return 1
    fi
    SOURCE_DIR="${PKG_DIR}"
    BUILD_DIR="${PKG_DIR}"

    # verify/fetch
    local DOWNLOAD_VERBOSE COUNT I URLS_IREF URLS CHECKSUM
    DOWNLOAD_VERBOSE=false
    COUNT=0
    for I in "${!PKGS[@]}"; do
        if [[ "${SKIP[I]}" == true ]]; then
            continue
        fi
        COUNT=$((COUNT+1))
        printf "Downloading [%02i/%02i] %s " "${COUNT}" "${NOT_SKIPPED_TOTAL}" "${NAMES[I]} ${VERSIONS[I]}"
        URLS_IREF="${URLS_VARNAMES[I]}[@]"
        URLS="${!URLS_IREF}"
        CHECKSUM=$(${SHA256} "${PKG_DIR}/${PKGS[I]}" 2>/dev/null | awk '{ print $1 }')
        if [[ "${CHECKSUM}" != "${CHECKSUMS[I]}" ]] >/dev/null 2>&1; then
            download_url "${DOWNLOAD_VERBOSE}" "${PKG_DIR}/${PKGS[I]}" ${URLS[@]} || return 1
        fi
        CHECKSUM=$(${SHA256} "${PKG_DIR}/${PKGS[I]}" 2>/dev/null | awk '{ print $1 }')
        if [[ "${CHECKSUM}" != "${CHECKSUMS[I]}" ]]; then
            echo "checksum mismatch for package: ${PKG_DIR}/${PKGS[I]}" >&2
            echo "expected: ${CHECKSUMS[I]}" >&2
            echo "actual:   ${CHECKSUM}" >&2
            return 1
        fi
        echo ""
    done

    # extract
    COUNT=0
    for I in "${!PKGS[@]}"; do
        if [[ "${SKIP[I]}" == true ]]; then
            continue
        fi
        COUNT=$((COUNT+1))
        printf "Extracting  [%02i/%02i] %s " "${COUNT}" "${NOT_SKIPPED_TOTAL}" "${PKGS[I]}"
        if [[ -e "${SOURCE_DIR}/${NAMES[I]}" ]]; then
            rm -rf "${SOURCE_DIR}/${NAMES[I]}"
        fi
        mkdir -p "${SOURCE_DIR}/${NAMES[I]}"
        if ! tar -xf "${PKG_DIR}/${PKGS[I]}" -C "${SOURCE_DIR}/${NAMES[I]}" >/dev/null 2>&1; then
            echo "unable to extract package: ${PKG_DIR}/${PKGS[I]}" >&2
            return 1
        fi
        echo ""
    done

    # build
    local INDEX
    export PATH="${PREFIX}/bin${PATH:+:$PATH}"

    # autoconf
    INDEX=0
    printf "Building    [%02i/%02i] %s " "$((INDEX+1))" "${TOTAL}" "${NAMES[$INDEX]} ${VERSIONS[$INDEX]}"
    if [[ "${SKIP[$INDEX]}" == true ]]; then
        echo "(${INSTALLED_VERSIONS[$INDEX]} installed, skipping)"
    else
        [[ "${SUDO}" != "" ]] && ${SUDO} -v
        touch "${BUILD_DIR}/${NAMES[$INDEX]}.log"
        mkdir -pv "${BUILD_DIR}/${NAMES[$INDEX]}" > "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        cd "${BUILD_DIR}/${NAMES[$INDEX]}"
        "${SOURCE_DIR}/${NAMES[$INDEX]}/${PKGS[$INDEX]%\.tar\.*}/configure" --prefix="${PREFIX}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        make -j "${JOBS}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} make install >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        echo ""
    fi

    # automake
    INDEX=$((INDEX+1))
    printf "Building    [%02i/%02i] %s " "$((INDEX+1))" "${TOTAL}" "${NAMES[$INDEX]} ${VERSIONS[$INDEX]}"
    if [[ "${SKIP[$INDEX]}" == true ]]; then
        echo "(${INSTALLED_VERSIONS[$INDEX]} installed, skipping)"
    else
        [[ "${SUDO}" != "" ]] && ${SUDO} -v
        touch "${BUILD_DIR}/${NAMES[$INDEX]}.log"
        mkdir -pv "${BUILD_DIR}/${NAMES[$INDEX]}" > "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        cd "${BUILD_DIR}/${NAMES[$INDEX]}"
        "${SOURCE_DIR}/${NAMES[$INDEX]}/${PKGS[$INDEX]%\.tar\.*}/configure" --prefix="${PREFIX}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        make -j "${JOBS}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} make install >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        echo ""
    fi

    # cmake
    INDEX=$((INDEX+1))
    printf "Building    [%02i/%02i] %s " "$((INDEX+1))" "${TOTAL}" "${NAMES[$INDEX]} ${VERSIONS[$INDEX]}"
    if [[ "${SKIP[$INDEX]}" == true ]]; then
        echo "(${INSTALLED_VERSIONS[$INDEX]} installed, skipping)"
    else
        [[ "${SUDO}" != "" ]] && ${SUDO} -v
        touch "${BUILD_DIR}/${NAMES[$INDEX]}.log"
        mkdir -pv "${BUILD_DIR}/${NAMES[$INDEX]}" > "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        cd "${BUILD_DIR}/${NAMES[$INDEX]}"
        "${SOURCE_DIR}/${NAMES[$INDEX]}/${PKGS[$INDEX]%\.tar\.*}/configure" --prefix="${PREFIX}" --no-qt-gui --system-curl >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        make -j "${JOBS}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} make install >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        echo ""
    fi

    # libtool
    INDEX=$((INDEX+1))
    printf "Building    [%02i/%02i] %s " "$((INDEX+1))" "${TOTAL}" "${NAMES[$INDEX]} ${VERSIONS[$INDEX]}"
    if [[ "${SKIP[$INDEX]}" == true ]]; then
        echo "(${INSTALLED_VERSIONS[$INDEX]} installed, skipping)"
    else
        [[ "${SUDO}" != "" ]] && ${SUDO} -v
        touch "${BUILD_DIR}/${NAMES[$INDEX]}.log"
        mkdir -pv "${BUILD_DIR}/${NAMES[$INDEX]}" > "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        cd "${BUILD_DIR}/${NAMES[$INDEX]}"
        "${SOURCE_DIR}/${NAMES[$INDEX]}/${PKGS[$INDEX]%\.tar\.*}/configure" --prefix="${PREFIX}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        make -j "${JOBS}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} make install >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        echo ""
    fi

    # meson
    INDEX=$((INDEX+1))
    printf "Building    [%02i/%02i] %s " "$((INDEX+1))" "${TOTAL}" "${NAMES[$INDEX]} ${VERSIONS[$INDEX]}"
    if [[ "${SKIP[$INDEX]}" == true ]]; then
        echo "(${INSTALLED_VERSIONS[$INDEX]} installed globally, skipping)"
    else
        [[ "${SUDO}" != "" ]] && ${SUDO} -v
        touch "${BUILD_DIR}/${NAMES[$INDEX]}.log"
        mkdir -pv "${BUILD_DIR}/${NAMES[$INDEX]}" > "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        cd "${SOURCE_DIR}/${NAMES[$INDEX]}/${PKGS[$INDEX]%\.tar\.*}"
        ${SUDO} python3 setup.py --no-user-cfg install --root="${PREFIX}" --prefix=/ --install-scripts=/bin --install-lib=/bin --single-version-externally-managed --no-compile --force >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} sed -i.bak '1s:.*:#!/usr/bin/env python3:' "${PREFIX}/bin/${NAMES[$INDEX]}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} rm -f "${PREFIX}/bin/${NAMES[$INDEX]}.bak" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} rm -rf "${PREFIX}/bin/${NAMES[$INDEX]}build/__pycache__" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} rm -rf "${PREFIX}/bin/${NAMES[$INDEX]}-${VERSIONS[$INDEX]}.dist-info" 2>&1 || return 1
        ${SUDO} mv "${PREFIX}/bin/${NAMES[$INDEX]}-${VERSIONS[$INDEX]}"*.egg-info "${PREFIX}/bin/${NAMES[$INDEX]}-${VERSIONS[$INDEX]}.dist-info" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} mv "${PREFIX}/bin/${NAMES[$INDEX]}-${VERSIONS[$INDEX]}.dist-info/PKG-INFO" "${PREFIX}/bin/${NAMES[$INDEX]}-${VERSIONS[$INDEX]}.dist-info/METADATA" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        echo ""
    fi

    # nasm
    INDEX=$((INDEX+1))
    printf "Building    [%02i/%02i] %s " "$((INDEX+1))" "${TOTAL}" "${NAMES[$INDEX]} ${VERSIONS[$INDEX]}"
    if [[ "${SKIP[$INDEX]}" == true ]]; then
        echo "(${INSTALLED_VERSIONS[$INDEX]} installed, skipping)"
    else
        [[ "${SUDO}" != "" ]] && ${SUDO} -v
        touch "${BUILD_DIR}/${NAMES[$INDEX]}.log"
        mkdir -pv "${BUILD_DIR}/${NAMES[$INDEX]}" > "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        cd "${BUILD_DIR}/${NAMES[$INDEX]}"
        "${SOURCE_DIR}/${NAMES[$INDEX]}/${PKGS[$INDEX]%\.tar\.*}/configure" --prefix="${PREFIX}" --enable-sections --enable-lto >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        make -j "${JOBS}" AR=ar RANLIB=ranlib >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} make install >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        echo ""
    fi

    # ninja
    INDEX=$((INDEX+1))
    printf "Building    [%02i/%02i] %s " "$((INDEX+1))" "${TOTAL}" "${NAMES[$INDEX]} ${VERSIONS[$INDEX]}"
    if [[ "${SKIP[$INDEX]}" == true ]]; then
        echo "(${INSTALLED_VERSIONS[$INDEX]} installed, skipping)"
    else
        [[ "${SUDO}" != "" ]] && ${SUDO} -v
        touch "${BUILD_DIR}/${NAMES[$INDEX]}.log"
        mkdir -pv "${BUILD_DIR}/${NAMES[$INDEX]}" > "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        cd "${BUILD_DIR}/${NAMES[$INDEX]}"
        "${SOURCE_DIR}/${NAMES[$INDEX]}/${PKGS[$INDEX]%\.tar\.*}/configure.py" --bootstrap >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} mv ninja "${PREFIX}/bin" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        echo ""
    fi

    # pkg-config
    INDEX=$((INDEX+1))
    printf "Building    [%02i/%02i] %s " "$((INDEX+1))" "${TOTAL}" "${NAMES[$INDEX]} ${VERSIONS[$INDEX]}"
    if [[ "${SKIP[$INDEX]}" == true ]]; then
        echo "(${INSTALLED_VERSIONS[$INDEX]} installed, skipping)"
    else
        [[ "${SUDO}" != "" ]] && ${SUDO} -v
        touch "${BUILD_DIR}/${NAMES[$INDEX]}.log"
        mkdir -pv "${BUILD_DIR}/${NAMES[$INDEX]}" > "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        cd "${BUILD_DIR}/${NAMES[$INDEX]}"
        "${SOURCE_DIR}/${NAMES[$INDEX]}/${PKGS[$INDEX]%\.tar\.*}/configure" --prefix="${PREFIX}" --with-internal-glib --disable-host-tool >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        make -j "${JOBS}" >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        ${SUDO} make install >> "${BUILD_DIR}/${NAMES[$INDEX]}.log" 2>&1 || return 1
        echo ""
    fi

    # clean up
    ${SUDO} rm -rf "${PKG_DIR}"

    # done
    if [[ "${PREFIX}" != "/usr/local" ]] && [[ "${NOT_SKIPPED_TOTAL}" -gt 0 ]]; then
        echo "  run the following command and add it to your shell startup script"
        echo "  (e.g., .bashrc or .bash_profile) to make persistent across sessions:"
        echo "    export PATH=\"${PREFIX}/bin:\${PATH}\""
    fi
    echo "Complete."

    set +o pipefail
}

trap die_gracefully EXIT INT TERM

mac_toolchain_build "${@}" &
PID=$!
display_progress "${PID}"
wait "${PID}" || CODE=$?

trap - EXIT INT TERM

if [[ "${CODE}" -ne 0 ]]; then
    echo -n "error: subprocess returned non-zero error code (${CODE})" >&2
    die_gracefully
fi
exit 0