#!/bin/sh
#
# Download and bootstrap the indicated version of the Boost C++
# Libraries.

set -u
set -e

if [ $# -ne 1 ]; then
    printf 'usage: %s <version>\n' "$(basename "$0")" 1>&2
    exit 1
fi

readonly version="$1"
readonly version_name="$(printf '%s' "${version}" | sed 's/\./_/g')"
readonly root="${HOME}"/opt/local/src/boost
readonly directory=boost_"${version_name}"
readonly filename="${directory}".tar.gz

if [ ! -d "${root}" ]; then
    printf 'error: %s does not exist.\n' "${root}" 1>&2
    exit 1
fi

if [ -d "${root}"/"${directory}" ]; then
    printf 'error: %s already exists.\n' "${root}/${directory}" 1>&2
    exit 1
fi

if [ -e "${root}"/"${filename}" ]; then
    printf 'error: %s already exists.\n' "${root}/${filename} " 1>&2
    exit 1
fi

readonly url=https://archives.boost.io/release/"${version}"/source/"${filename}"

curl --no-clobber --location --remote-name --output-dir "${root}" "${url}"

if [ ! -e "${root}"/"${filename}" ]; then
    printf 'error: %s does not exist.\n' "${root}/${filename}" 1>&2
    exit 1
fi

tar -x -z -f "${root}"/"${filename}" -C "${root}"

if [ ! -d "${root}"/"${directory}" ]; then
    printf 'error: %s does not exist.\n' "${root}/${directory} " 1>&2
    exit 1
fi

cwd="$(pwd)"
readonly cwd
cd "${root}"/"${directory}"

./bootstrap.sh
cd "${cwd}"

cat > "${root}"/b2_"${version_name}".sh <<EOF
#!/bin/sh
if [ -n "\${BOOST_BUILD_PATH}" ]; then
    export BOOST_BUILD_PATH="\${BOOST_BUILD_PATH}":"${root}"/"${directory}"/tools/build
else
    export BOOST_BUILD_PATH="${root}"/"${directory}"/tools/build
fi
"${root}"/"${directory}"/b2 "\$@"
EOF
chmod a+x "${root}"/b2_"${version_name}".sh