#! /usr/bin/env bash

# These variables need to exist
prefix=/usr/local
exec_prefix=${prefix}
datarootdir=${prefix}/share

if [[ $# -eq 0 || -n $( echo $* | egrep -- "--help|-h" ) ]]; then
    echo "lhapdf-config: configuration tool for the LHAPDF"
    echo "               parton density function evolution library"
    echo "               http://projects.hepforge.org/lhapdf/"
    echo
    echo "Usage: lhapdf-config [[--help|-h] | [--prefix] | [--pdfsets-path]]"
    echo "Options:"
    echo "  --help | -h    : show this help message"
    echo "  --prefix       : show the installation prefix (cf. autoconf)"
    echo "  --incdir       : show the path to the LHAPDF header directory (for C++ interface)"
    echo "  --libdir       : show the path to the LHAPDF library directory"
    echo "  --datadir      : show the path to the LHAPDF installed data directory"
    echo "  --pdfsets-path : show the path to the directory containing the PDF set data files"
    echo
    echo "  --cppflags     : get compiler flags for use with the C preprocessor stage of C++ compilation"
    echo "  --ldflags      : get compiler flags for use with the linker stage of any compilation"
    echo
    echo "  --version      : returns Rivet release version number"
fi

OUT=""

tmp=$( echo "$*" | egrep -- '--\<prefix\>')
test -n "$tmp" && OUT="$OUT /usr/local"

tmp=$( echo "$*" | egrep -- '--\<incdir\>')
test -n "$tmp" && OUT="$OUT ${prefix}/include"

tmp=$( echo "$*" | egrep -- '--\<cppflags\>')
test -n "$tmp" && OUT="$OUT -I${prefix}/include"

tmp=$( echo "$*" | egrep -- '--\<libdir\>')
test -n "$tmp" && OUT="$OUT ${exec_prefix}/lib"

tmp=$( echo "$*" | egrep -- '--\<ldflags\>')
test -n "$tmp" && OUT="$OUT -L${exec_prefix}/lib -lLHAPDF"

tmp=$( echo "$*" | egrep -- '--\<datadir\>|--\<datarootdir\>')
test -n "$tmp" && OUT="$OUT ${datarootdir}/lhapdf"

tmp=$( echo "$*" | egrep -- '--\<pdfsets-path\>')
test -n "$tmp" && OUT="$OUT ${datarootdir}/lhapdf/PDFsets"

## Version
tmp=$( echo "$*" | egrep -- '--\<version\>')
test -n "$tmp" && OUT="$OUT 5.9.1"

echo $OUT