#!/bin/bash

set -euo pipefail

# Renders a file that is compiled into the agent so it can identify its own
# versions and the version of collectd it is using.

# Caller must set the envvars used in the template.

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

target_file=${1-"$SCRIPT_DIR/../internal/core/common/constants/versions.go"}

old_content=$(cat $target_file 2>/dev/null || echo -n "")
new_content=$(eval "cat <<EOF
$(<${target_file}.tmpl)
EOF
")

# Don't write content if it's the same so we don't trigger a recompilation.
[[ $old_content == $new_content ]] || echo -n "$new_content" | gofmt > $target_file