#!/bin/bash
set -eux

srcDir=${GOPATH}/src/$(basename ${SRC_PKG})
trap "rm -rf ${srcDir}" EXIT

version_ge() { test "$(echo "$@" | tr " " "\n" | sort -rV | head -n 1)" == "$1"; }

if [ -d ${SRC_PKG} ]; then
    echo "Building in directory ${srcDir}"
    ln -sf ${SRC_PKG} ${srcDir}
elif [ -f ${SRC_PKG} ]; then
    echo "Building file ${SRC_PKG} in ${srcDir}"
    mkdir -p ${srcDir}
    cp ${SRC_PKG} ${srcDir}/function.go
fi

cd ${srcDir}

if [ -f "go.mod" ]; then
    go mod download
else
    export GO111MODULE="on"
    go mod init
    go mod tidy
fi

GOFLAGS="-buildmode=plugin"

if [ -d "vendor" ] && version_ge ${GOLANG_VERSION} "1.12"; then
    GOFLAGS="${GOFLAGS} -mod=vendor"
fi

go build ${GOFLAGS} -o ${DEPLOY_PKG} .