Flatten a yaml file or write a terraform helm_release 'set' block, using yq

flatten_yaml.sh

#!/usr/bin/env bash

_usage() {
  echo "
${0} Parses a yaml file and returns a list of flattened key/values
${0} -f filename
${0} -tf filename #Return a terraform set with the key/value sets
"
  exit 1
}


if ! yq --version >/dev/null 2>&1 ; then
  echo "YQ required"
  exit 1
fi

_flatten() {
  yq eval '.. | select((tag == "!!map" or tag == "!!seq") | not) | (path | join(".")) + "=" + .' "${filename}"
}

_sets() {
  while read -r sets; do
    k="${sets%=*}"
    v="${sets#*=}"
    echo "set {
  name  = \"$k\"
  value = \"$v\"
}"
  done <<<"$(_flatten)"
}

while getopts f:t flag; do
  case "${flag}" in
    f) filename=${OPTARG}
      if [[ -z "${filename}" ]]; then
        _usage
      fi
      if [[ ! -f "${filename}" ]]; then
        echo "${filename}: No such file"
        _usage
      fi
    ;;
    t) tf=true
    ;;
    *) _usage;;
  esac
done

if [[ -n ${tf} ]]; then
  _sets
else
  _flatten
fi