#!/bin/bash

set -e
set -u

APPSH_HOME=$(cd $(dirname "$0")/.. && pwd)

. $APPSH_HOME/lib/common
# HEADER END

key_expr="[a-zA-Z][_a-zA-Z0-9]*"

file=.app/config
name=""

while getopts "f:n:" opt
do
  case $opt in
    f)
      file=$OPTARG
      ;;
    n)
      name=$OPTARG
      ;;
    \?)
      echo "Invalid option: $OPTARG" >&2
      exit 1
      ;;
  esac
done

if [ -z "$name" ]
then
  filter="s,^[ ]*\($key_expr\.$key_expr\)[ ]*=[ ]*\(.*\)$,\1=\2,p"
else
  filter="s,^\($name\)=\(.*\),\1=\2,p"
fi

APPSH_DEFAULT_CONFIG=${APPSH_DEFAULT_CONFIG-$APPSH_HOME/lib/default-config}

# The awk script makes sure each key only appears once
cat "$file" "$APPSH_DEFAULT_CONFIG" | \
  sed -n -e "$filter" | \
  awk -F = ' (!($1 in a)){a[$1]; print }' | \
  sort