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	#!/bin/bash
	#
	# This script will generate a Makefile according to the options one requests.
	# The Makefile will then allow one to build and install the FastJet contrib.
	#
	# See
	# configure --help
	# for information about how to use this script

	#------------------------------------------------------------------------
	# the list of contribs supported by this script
	#------------------------------------------------------------------------
	all_contribs=`find . -mindepth 2 -maxdepth 2 -name VERSION -not -print \| sed 's/\.\///g;s/\/.*$//g' \| grep -v "Template"`

	#------------------------------------------------------------------------
	# default values prior to the arg parsing
	#------------------------------------------------------------------------
	only_contribs=""
	excluded_contribs=""

	fjconfig="fastjet-config"

	#------------------------------------------------------------------------
	# print a usage message and exit
	#------------------------------------------------------------------------
	# exit code passed as argument:
	# 0 if it is a normal call
	# 1 if it is due to a misusage.
	usage(){
	cat 1>&2 <<EOF

	This is a FastJet-contrib tool to configure the behaviour of
	the build and installation.

	Usage:
	configure [--help] [--list] [--fastjet-config=FILE] [--prefix=PREFIX]

	The arguments can be the following [default in square brackets]:

	--help prints this message and exits
	--list prints the list of existing contribs and exits
	--fastjet-config=FILE
	sets the 'fastjet-config' file to use [$fjconfig]
	--prefix=PREFIX sets the installation directory [prefix returned by fastjet-config]
	--only=Contrib1,Contrib2,...
	only configures for compilation selected contribs
	--exclude=Contrib1,Contrib2,...
	excludes selected contribs from configuration
	EOF
	exit $1
	}

	#------------------------------------------------------------------------
	# wite error messages and exit
	#------------------------------------------------------------------------
	write_error(){
	echo "Error: $1"
	echo "Use fastjet-config --help for more information"
	exit 1
	}


	#------------------------------------------------------------------------
	# tools to parse options
	#------------------------------------------------------------------------

	# option_name _string
	# Returns NAME if _string is of the form: --NAME[=...]
	option_name(){
	echo "$1" \| sed 's/^--//;s/=.*//' \| tr '-' '_'
	}

	# option_value _string
	# Returns FOO if _string is of the form: --option=FOO
	option_value(){
	echo "$1" \| sed 's/^[^=]*=//'
	}

	# is_in_list _arg _arg_list
	# return true if the argument _arg is in the list _arg_list
	# and false otherwise
	is_in_list(){
	arg_match="$1"
	shift
	for arg_match_i do
	[ "x$arg_match_i" != "x$arg_match" ] \|\| return 0
	done
	false
	}

	#------------------------------------------------------------------------
	# parse the command line options
	#------------------------------------------------------------------------
	# first deal with the case where no argument is passed
	#[ $# -gt 0 ] \|\| usage 1

	for arg do
	case "$arg" in
	--help\|-h)
	usage 0
	;;
	--list)
	echo $all_contribs
	exit 0
	;;
	--=)
	arg_name=`option_name $arg`
	arg_value=`option_value $arg`
	case $arg_name in
	prefix)
	prefix="$arg_value"
	;;
	fastjet_config)
	fjconfig="$arg_value"
	;;
	only)
	only_contribs="${arg_value//,/ /}"
	;;
	exclude)
	excluded_contribs="${arg_value//,/ /}"
	;;
	*)
	write_error "$arg: unrecognised argument"
	;;
	esac
	;;
	*)
	write_error "$arg is not a recognised argument. Aborting"
	;;
	esac
	done

	#------------------------------------------------------------------------
	# check for fastjet-config and set up prefix
	#------------------------------------------------------------------------

	# exit if fastjet-config is not found (bad file name or not in path)
	if ! [ `command -v $fjconfig` ]; then
	echo $fjconfig" has not been found. Exiting."; exit 1
	fi

	# if prefix has not been set explicitly from command line, set it to
	# the one returned by 'fastjet-config --prefix'
	if [ "x"$prefix == "x" ] ; then
	prefix=`$fjconfig --prefix`
	fi

	#------------------------------------------------------------------------
	# construct the list of directories to recurse into
	#------------------------------------------------------------------------

	included_contribs=""
	if [ "x${only_contribs}" == "x" ] ; then
	included_contribs="$all_contribs"
	else
	included_contribs="$only_contribs"
	fi

	built_contribs=""
	if [ "x${excluded_contribs}" == "x" ] ; then
	built_contribs="$included_contribs"
	else
	built_contribs=""
	for contrib in $included_contribs; do
	if ! is_in_list $contrib ${excluded_contribs} ; then
	built_contribs="$built_contribs $contrib"
	fi
	done
	fi

	#------------------------------------------------------------------------
	# create the Makefile
	#------------------------------------------------------------------------
	TAB="$(printf '\t')"

	# cat >Makefile <<EOF
	# # This Makefile has been generated by the 'configure' script.
	# # Please edit this with great care.
	#
	# # installation setup
	# SUBDIRS=$built_contribs
	#
	# # Note: we could simply use "export" here to have all variables
	# # exported by default, but the explicit mention below has the advantage
	# # that it overrides any default in the sub-makefile. Note also
	# # that we could play some games with te MAKELEVEL variable.
	# SUBMAKE=\$(MAKE) FASTJETCONFIG=${fjconfig} PREFIX=$prefix
	#
	# RECURSIVE_TARGETS=all-recursive install-recursive clean examples
	#
	# .PHONY: \$(RECURSIVE_TARGETS) install examples
	#
	# all: all-recursive
	#
	# install: all install-recursive
	#
	# \$(RECURSIVE_TARGETS):
	# ${TAB}@+failcom='exit 1' \\
	# ${TAB}target=\`echo \$@ \| sed s/-recursive//\`; \\
	# ${TAB}list='\$(SUBDIRS)'; for subdir in \$(SUBDIRS); do \\
	# ${TAB} \$(SUBMAKE) -C \$\$subdir \$\$target \|\| eval \$\$failcom; \\
	# ${TAB}done
	#
	# EOF

	# The method below id more along the lines of what is present in the
	# GNU make manual but the explicit use of $(MAKECMDGOALS) in the
	# recursion causes make install to recurse as "make install" (even
	# though it depends on make all... so each the contribs is built and
	# installed before going to the next one, In case of a compilation
	# error, it is better to build everything and then install everything.
	#
	# The option to avoid that would be to define an explicit recursion
	# for each target e.g. doing
	#
	# SUBDIRS.clean = $(SUBDIRS:=.clean)
	# clean: $(SUBDIRS.clean)
	# $(SUBDIRS.clean):
	# $(MAKE) -C $@ clean
	# .PHONY: clean $(SUBDIRS.clean)
	#
	# which, in our case would probably only be required for "all" (so
	# that it can explicitly be called by install
	#
	# Note that this method may have a better behaviour when using the -j
	# option.

	# cat >Makefile <<EOF
	# # This Makefile has been generated by the 'configure' script.
	# # Please edit this with great care.
	#
	# # installation setup
	# SUBDIRS=$built_contribs
	# SUBDIRS.all=\$(SUBDIRS:=.all)
	#
	# SUBMAKE=\$(MAKE) FASTJETCONFIG=${fjconfig} PREFIX=$prefix
	#
	# .PHONY: \$(SUBDIRS) \$(SUBDIRS.all) clean distclean check install examples
	#
	# all: \$(SUBDIRS.all)
	#
	# install: all \$(SUBDIRS)
	#
	# examples check clean distclean: \$(SUBDIRS)
	#
	# \$(SUBDIRS):
	# ${TAB}+\$(SUBMAKE) -C \$@ \$(MAKECMDGOALS)
	#
	# \$(SUBDIRS.all):
	# ${TAB}+\$(SUBMAKE) -C \$(basename \$@)
	#
	# EOF

	# alternatively we could build this from the Makefile.in
	# prefix variable

	# note that the apparently bizarre construct below ensures that the
	# appropriate characters are escaped in the sed replacement
	escaped_built_list="$(echo ${built_contribs} \| sed -e 's/[\/&]/\\&/g')"
	escaped_fjconfig="$(echo ${fjconfig} \| sed -e 's/[\/&]/\\&/g')"
	escaped_prefix="$(echo ${prefix} \| sed -e 's/[\/&]/\\&/g')"

	commandline="$0 $*"
	sed -e "s/@CONTRIB_BUILD_LIST@/$escaped_built_list/g;\
	s/@FJCONFIG@/$escaped_fjconfig/g;\
	s,@PREFIX@,${escaped_prefix},g;\
	s/template gets processed/was generated automatically/;\
	s,@contrib_commandline@,$commandline,;\
	s/any edits fit with the rest of the build system/you only edit Makefile.in/" Makefile.in > Makefile


	#------------------------------------------------------------------------
	# write output and config.log file
	#------------------------------------------------------------------------

	echo -e "\nEnabled contribs: "$built_contribs
	echo -e "Installation prefix: "$prefix
	echo -e "Now run 'make', optionally 'make check', and 'make install'\n"

	echo -e "This file was created by the fastjet contrib configure on "`date`"\n" > config.log
	echo -e "The command line invocation was\n" >> config.log
	echo -e " $0 $@\n" >> config.log
	echo -e "List of enabled contribs: "$built_contribs"\n" >> config.log
	echo -e "Installation prefix: "$prefix"\n" >> config.log

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