#!/usr/bin/env bash

set -e -u

prefix="/opt/api-umbrella"
source_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
build_dir="$(pwd)"

usage() {
  cat <<EOS
Usage: ./configure [OPTION]...

Defaults for the options are specified in brackets.

Configuration:
  -h, --help              display this help and exit

Installation directories:
  --prefix=PREFIX         install architecture-independent files in PREFIX
                          [$prefix]
EOS
  exit 0
}

while [ $# -gt 0 ]; do
  key="$1"
  case $key in
    --prefix=*)
      prefix="${key#*=}"
      shift
      ;;
    --help|-h)
      usage
      ;;
    *)
      echo "configure: error: unrecognized option: '$key'"
      echo "Try './configure --help' for more information"
      exit 1
      ;;
  esac
done

if [ -z "$prefix" ]; then
  echo "configure: error: missing argument to --prefix"
  exit 1
fi

echo "configure: creating Makefile"
< "$source_dir/Makefile.in" sed -e "s|@prefix@|$prefix|g" | sed -e "s|@source_dir@|$source_dir|g" | sed -e "s|@build_dir@|$build_dir|g" > Makefile