morphirw

#!/usr/bin/env bash

# Download and run the Morphir launcher jar.
#
# The launcher jar downloads the other jars that are required for Morphir development.
#
# The version of the launcher jar can be set from MORPHIR_VERSION or the .morphir-version file.
#
# Order of precedence for launcher jar version is
#   - MORPHIR_VERSION env variable
#   - contents of version file .morphir-version
#   - the default from this file

set -euo pipefail
#set -x

FALLBACK_MORPHIR_VERSION=0.2.1
MORPHIR_VERSION_FILE=.morphir-version
CACHE_HOME="${XDG_CACHE_HOME:-$HOME/.cache}/morphir/launcher"
URL_FMT=https://repo1.maven.org/maven2/org/finos/morphir/morphir-tools-launcher_2.13/%s/morphir-tools-launcher_2.13-%s-assembly.jar

_log() {
    echo $* >/dev/stderr
    echo >/dev/stderr
}

_advise_version_is_from() {
    local ver="$1"
    local src="$2"

    _log Using Morphir launcher version $ver set from $src...
}

_version_from_env()  {
    if [[ -n "${MORPHIR_VERSION+x}" ]]; then
        _advise_version_is_from $MORPHIR_VERSION "MORPHIR_VERSION environment variable"
        echo $MORPHIR_VERSION
    else
        return 1
    fi
}

_version_from_file() {
    if [[ -r "$MORPHIR_VERSION_FILE" ]]; then
        local ver="$(cat "$MORPHIR_VERSION_FILE")"
        _advise_version_is_from $ver "file $MORPHIR_VERSION_FILE"
        echo $ver
    else
        return 1
    fi
}

_version_fallback() {
    _advise_version_is_from $FALLBACK_MORPHIR_VERSION "hard-coded default"
    echo $FALLBACK_MORPHIR_VERSION
}

morphir_version() {
    _version_from_env || _version_from_file || _version_fallback
}

curl_download() {
    local url="$1"
    local target="$2"

    mkdir -p "$(dirname $target)"

    _log Downloading $url to $target...

    curl -Sf -o "$target" "$url"

    _log
}

launcher_jar_url() {
    local ver="$1"

    printf $URL_FMT $ver $ver
}

main() {
    local ver="$(morphir_version)"
    local url="$(launcher_jar_url "$ver")"
    local jar="$CACHE_HOME/$ver.jar"

    [[ ! -r "$jar" ]] && curl_download "$url" "$jar"

    _log Running $jar...

    java -jar "$jar"
}

main