#!/bin/bash

set -e

reference_ref=${1:-master}

reference_git=${2:-.}

if ! `hash benchstat 2>/dev/null`; then

    echo "Installing benchstat"

    go get golang.org/x/perf/cmd/benchstat

    go install golang.org/x/perf/cmd/benchstat

fi

tempdir=`mktemp -d /tmp/go-toml-benchmark-XXXXXX`

ref_tempdir="${tempdir}/ref"

ref_benchmark="${ref_tempdir}/benchmark-`echo -n ${reference_ref}|tr -s '/' '-'`.txt"

local_benchmark="`pwd`/benchmark-local.txt"

echo "=== ${reference_ref} (${ref_tempdir})"

git clone ${reference_git} ${ref_tempdir} >/dev/null 2>/dev/null

pushd ${ref_tempdir} >/dev/null

git checkout ${reference_ref} >/dev/null 2>/dev/null

go test -bench=. -benchmem | tee ${ref_benchmark}

popd >/dev/null

echo ""

echo "=== local"

go test -bench=. -benchmem  | tee ${local_benchmark}

echo ""

echo "=== diff"

benchstat -delta-test=none ${ref_benchmark} ${local_benchmark}