#!/bin/bash

# display help text
usage () {
  cat <<EOF
Installation directories:
  --prefix=PREFIX         install architecture-independent files in PREFIX
                          [/usr/local]
EOF
}

# report an error regarding the arguments
invalid_arg () {
  cat <<EOF
configure: error: unrecognized option: \`$1'
Try \`$0 --help' for more information
EOF
}

# default values
prefix=/usr/local

# long arguments are implemented by putting a dash character followed by
# a colon in the optspec, see trick by Arvid Requate at
# <http://stackoverflow.com/questions/402377/#7680682>
while getopts -- ":-:" optchar; do
  case "${optchar}" in
    -)
      # OPTARG now contains everything after double dashes
      case "${OPTARG}" in
        prefix=*)
          # remove prefix consisting of everything up to equal sign
          prefix=${OPTARG#*=}
          ;;
        help)
		  usage
		  exit 0
		  ;;
        *)
          # remove everything *after* the equal sign
		  arg=${OPTARG%=*}
          invalid_arg --$arg
		  exit 1
	      ;;
      esac
	  ;;
    *)
	  invalid_arg -$OPTARG
	  exit 1
      ;;
  esac
done
# remove all arguments processed by getopts
shift $((OPTIND-1))

# pass everything on to CMake
env "$@" cmake "$(dirname $0)" "-DCMAKE_INSTALL_PREFIX=$prefix"