#!/usr/bin/env bash
set -e

# Normalise YAML files passed as inputs, then run diff on them.

check_util() {
  local util=$1

  if [ -z $util ]; then
     echo "Error: $util not found in PATH"
     exit 1
  fi
}

DIFF=`which diff`
check_util $DIFF

YQ=`which yq`
check_util $YQ

# Only normalise YAML files.
# Print anything else as is.
normalise() {
  local file=$1
  local contents=($YQ -y -S '.' $file)

  # if $contents contains actual YAML data, print it
  if [[ $? == 0 ]]; then
     echo $contents
  else
      cat $file
  fi
}

$DIFF -u <(normalise $1) <(normalise $2)