#!/bin/bash

# Load.
source $APP_BASE/lib/hydra/functions || exit 1
hydra_config_load

# Parameters
BASENAME="`basename $0`"
PARAM="$1"
YAML_FILE="$2"
DEFAULT="$3"

# Check
if [ -z "$2" ]; then
  echo "usage: $BASENAME <param> <file> [default-value]"
  exit 1
elif [ ! -e "$YAML_FILE" ]; then
  echo "file not found: $YAML_FILE"
  exit 1
fi

# Dispatch
PARAM="`hydra_yaml_param $PARAM $YAML_FILE`"

# Display
if [ ! -z "$PARAM" ]; then
  echo "$PARAM"
elif [ ! -z "$DEFAULT" ]; then
  echo "$DEFAULT"
fi