Parse YAML file and only fetch value from key-value pair

parse_yaml.sh

#!/bin/bash
# Thanks to http://stackoverflow.com/a/21189044/1233922
prefix=$2
s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|/usr/bin/tr @ '\034')
/usr/bin/sed -ne "s|^\($s\):|\1|" \
  -e "s|^\($s\)\($w\)$s:$s[\"']\(.*\)[\"']$s\$|\1$fs\2$fs\3|p" \
  -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p"  $1 |
/usr/bin/awk -F$fs '{
  indent = length($1)/2;
  vname[indent] = $2;
  for (i in vname) {if (i > indent) {delete vname[i]}}
  if (length($3) > 0) {
    vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
    printf("\%s\n", $3);
  }
}'