syslw

#!/usr/bin/env sh

##############################################################################
##
##  Sysl wrapper for UN*X
##
##############################################################################

# function to retrieve a property from the syslw.properties file
syslw_property() {
    grep "${1}" ${WRAPPER_DIR}/syslw.properties|cut -d'=' -f2
}

# cache the wrapper directory
PRG="$0"
while [ -h "$PRG" ] ; do
    ls=$(ls -ld "$PRG")
    link=$(expr "$ls" : '.*-> \(.*\)$')
    if expr "$link" : '/.*' > /dev/null; then
        PRG="$link"
    else
        PRG=$(dirname "$PRG")"/$link"
    fi
done
SAVED="$(pwd)"
cd "$(dirname "${PRG}")/" >/dev/null || exit
WRAPPER_DIR="$(pwd -P)"
cd "$SAVED" >/dev/null || exit

# cache the url to retrieve the artifact
VERSION=$(syslw_property 'version')
BASE_URL=$(syslw_property 'downloadUrl')

OS_ARCH=$(uname -m | tr '[:upper:]' '[:lower:]')
OS_NAME=$(uname -s | tr '[:upper:]' '[:lower:]')
if [ "$OS_ARCH" = "x86_64" ]
then
    ARCH="amd64"
else
    ARCH="386"
fi
if [ "$OS_NAME" = "darwin" ]
then
    PLATFORM="darwin"
else
    PLATFORM="linux"
fi
FILENAME="sysl_${VERSION}_${PLATFORM}-${ARCH}.tar.gz"
URL="${BASE_URL}v${VERSION}/${FILENAME}"

# cache the release directory, archive and executable
PLATFORM_LOWER=$(echo ${PLATFORM} | tr '[:upper:]' '[:lower:]')
RELEASE_DIR="${WRAPPER_DIR}/.sysl/${VERSION}/${PLATFORM_LOWER}/${ARCH}"
RELEASE_EXE="${RELEASE_DIR}/sysl"

# make the release directory if necessary
mkdir -p ${RELEASE_DIR}

# download and extract the executable if it doesn't exist
if [ ! -e ${RELEASE_EXE} ]; then
    cd "${RELEASE_DIR}" || exit
    >&2 echo "Downloading sysl: ${URL}"
    curl -L --silent ${URL} | tar xz sysl
    cd "$SAVED" || exit
fi

# execute the command
${RELEASE_EXE} "$@"