#!/usr/bin/env bash

################################################################################
# This tool fetches versions and checksums of build tools from the .TOOLVERSIONS
# file in project root. This is then used by various setup scripts,
# and most importantly by Dockerfiles.
################################################################################

set -e

GIT_ROOT=$(git rev-parse --show-toplevel)
TOOL_VERSIONS_FILE="${GIT_ROOT}/.TOOLVERSIONS"

usage () {
  echo "Usage: toolversion [-c] <name>" >&2
  echo
  echo "This script extracts tooling versions from ${TOOL_VERSIONS_FILE}"
  exit 0
}

# some options parsing
while getopts ":ch" opt; do
  case $opt in
    c)  CHECKSUM=1; shift ;;
    h)  usage;;
    \?) echo "Invalid option: -$OPTARG" >&2; exit 1;;
  esac
done

# verify the main argument was given
if [[ -z "${1}" ]]; then usage; fi

NAME=${1}

getColumn () {
    local value=$(awk -F';' "/^${NAME};/{print \$${1}}" "${TOOL_VERSIONS_FILE}")
    [ -z "$value" ] && echo "\nUnexpected missing value for ${NAME} in ${TOOL_VERSIONS_FILE}" && exit 1
    echo $value
}

if [[ $CHECKSUM ]]; then
    getColumn 3
else
    getColumn 2
fi