#!/bin/bash
# Main build/run tool
# REQUIRES yarn
# If yarn is not found, python3 may be used to create a local node.js environment with yarn in it, and use it

yarn=$(which yarn 2>/dev/null)
set -e

if [ "x${yarn}" != "x" ]
then
    "${yarn}" "$@"
else
    dir=$(dirname $0)

    test -x "${dir}/.env/bin/nodeenv" || ( virtualenv -p python3 "${dir}/.env" && "${dir}/.env/bin/pip" install --upgrade nodeenv )
    test -e "${dir}/.env/node/bin/activate" || "${dir}/.env/bin/nodeenv" --node=9.3.0 --force "${dir}/.env/node"
    test -e "${dir}/.env/node/bin/yarn" || "${dir}/.env/node/bin/shim" "${dir}/.env/node/bin/npm" install -g yarn@1.3.2
    PATH="${dir}/.env/node/bin:${PATH}" yarn "$@"
fi