#!/bin/bash

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

Optional Packages:
  --with-boost=PATH       use Boost library from a specified location
  --with-superlu=PATH     user defined path to SuperLU library
  --with-agmg=PATH        Include DOUBLE PRECISION version Notay's of AGMG
                          Algebraic Multigrid solver from specified source
                          location. Note: this option requires a complete,
                          working Fortran 90 environment.
  --with-ert=PATH         Use ERT libraries

Some influential environment variables:
  CC          C compiler command
  CFLAGS      C compiler flags
  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
              nonstandard directory <lib dir>
  LIBS        libraries to pass to the linker, e.g. -l<library>
  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
              you have headers in a nonstandard directory <include dir>
  CPP         C preprocessor
  CXX         C++ compiler command
  CXXFLAGS    C++ compiler flags
  CXXCPP      C++ preprocessor
  F77         Fortran 77 compiler command
  FFLAGS      Fortran 77 compiler flags
  FC          Fortran compiler command
  FCFLAGS     Fortran compiler flags

Use these variables to override the choices made by \`configure' or to help
it to find libraries and programs with nonstandard names/locations.
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

# this variable will get feature options
FEATURES=

# 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=${OPTARG#*=}
          ;;
        help)
		  usage
		  exit 0
		  ;;
        with-*)
          # get the name of the package; everything before equal sign
          pkgname=${OPTARG%=*}
          pkgname=${pkgname#with-}
          # get the location of the package; everyhing after equal sign
          pkgloc=${OPTARG#*=}
          # packages need different suffix for their root (sic)
          case "${pkgname}" in
            agmg  |\
            boost |\
            ert   |\
            zlib)
              rootvar="${pkgname^^}_ROOT"
              ;;
            superlu)
              rootvar="${pkgname^^}_PREFIX"
              ;;
            *)
              rootvar="${pkgname}_DIR"
              ;;
          esac
          # add this to the list of existing features
          FEATURES="${FEATURES} -D${rootvar}=${pkgloc}"
          ;;
        *)
          # remove everything *after* the equal sign
		  arg=${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" ${FEATURES}