#!/bin/bash
#	g4blmake - build user code into G4beamline
#
#	Usage:
#		g4blmake [-h|-?|--help] [source1.cc source2.cc ...]
#	Makes a private build of g4beamline incorporating the listed
#	source files (*.cc *.C *.cpp by default).
#
#	See the G4beamline User's Guide for instructions and suggestions
#	on how to write code that G4beamline can use.
#
#	You can include new versions of G4beamline or library source files,
#	as long as their filenames are the same, as are the classes (etc.)
#	that they implement.
#
#	This script must be run via an absolute pathname, using the 
#	bin directory of the distribution. That implies that the
#	G4beamline "g4bl-setup.sh" command should be source-d by your shell.
#
#	If G4BL_DIR is set in the environment, then it is used instead of 
#	the above. There may well be problems if this script is not the same
#	as the version in $G4BL_DIR/bin.
#
#	G4BL_DIR is used to find the files needed to compile and link into 
#	G4beamline. It must point to a directory in which the G4beamline
#	libraries and source have already been built.

export G4BLMAKE=$USER

VERBOSE=false
SOURCEFILES=""

while test "$1"
do
	case "$1" in
	-h|-\?|--help)
		echo >&2 "USAGE:"
		echo >&2 '    g4blmake [-h|-?|--help] [-v] [source1.cc ...]'
		echo >&2 'Source files default to *.cc *.cpp *.C'
		echo >&2 "See the G4beamline User's Guide for instructions and"
		echo >&2 "suggestions on how to write code for G4beamline."
		echo >&2 "G4beamline include paths and libraries are supplied."
		echo >&2 "Flags to the compiler can be passed in CPPFLAGS."
		echo >&2 "Extra libraries can be passed in EXTRALIBS."
		exit
		;;
	-v)
		VERBOSE=true
		;;
	*)
		SOURCEFILES="$SOURCEFILES $1"
		;;
	esac
	shift
done

# find G4BL_DIR 
if test "$G4BL_DIR" = ""
then
	G4BL_DIR=`dirname "$0"`
	G4BL_DIR=`\cd "$G4BL_DIR" >&- 2>&- && pwd`
	G4BL_DIR=`dirname "$G4BL_DIR"`
	if test -x /bin/cygpath
	then
		G4BL_DIR=`/bin/cygpath -m "$G4BL_DIR"`
	fi
fi
export G4BL_DIR

# get SOURCEFILES
if test -z "$SOURCEFILES"
then
	for i in *.cc *.cpp *.C
	do
		if test -r "$i"
		then
			SOURCEFILES="$SOURCEFILES $i"
		fi
	done
fi
SOURCEFILES=${SOURCEFILES# }	# remove any initial space

if test -z "$SOURCEFILES"
then
	echo >&2 "g4blmake: no source files found"
	exit 1
fi

echo >&2 "compiling $SOURCEFILES, and linking g4beamline"
CPPFLAGS="$CPPFLAGS $($G4BL_DIR/bin/g4bl-config --include)"
LIBS="$EXTRALIBS $($G4BL_DIR/bin/g4bl-config --libs)"
MAIN="$($G4BL_DIR/bin/g4bl-config --main)"
OBJS="$($G4BL_DIR/bin/g4bl-config --objs)"

# remove duplicates from OBJS
TMP=''
for i in $OBJS
do
	KEEP=true
	F=`basename $i`
	F="${F%.*}"
	for j in $SOURCEFILES
	do
		G=`basename $j`
		G="${G%.*}"
		if test "$F" = "$G"
		then
			KEEP=false
			break
		fi
	done
	if $KEEP
	then
		TMP="$TMP $i"
	fi
done
OBJS="$TMP"

# construct CMD
if test `$G4BL_DIR/bin/g4bl-config --sys` = WIN32
then
	VCFLAGS=`$G4BL_DIR/bin/g4bl-config --vcflags`
	CMD="cl $VCFLAGS $CPPFLAGS /Feg4beamline $MAIN $SOURCEFILES $OBJS $LIBS"
else
	CMD="g++ $CPPFLAGS -o g4beamline $MAIN $SOURCEFILES $OBJS $LIBS"
fi

# compile and link g4beamline
if $VERBOSE
then
	echo $CMD
fi
$CMD

# check compilation
if test "$?" != 0
then
	echo >&2 "g4blmake: FAILED!"
	exit 1
else
	echo >&2 "Success! To execute this program you should do:"
	echo >&2 "    export G4BEAMLINE=$PWD/g4beamline"
	echo >&2 "    g4bl [...]"
	echo >&2
fi