#!/bin/sh

# Author:	Hanno Meyer-Thurow
# Revision:	4
#
# Use:		Rebuild your classmap database.

# defaults
JAVA_PKG_DB_TOOL="${JAVA_PKG_DB_TOOL:="$(gcj-config --dbtool)"}"
JAVA_PKG_CLASSMAP="${JAVA_PKG_CLASSMAP:="/usr/share/java/classmap.gcjdb"}"

# functions
die() {
	echo "ERROR: ${@}"
	exit 1
}

show_help() {
	echo "To rebuild your database run:"
	echo "	'${0} <database file> [ <packages> | <path> ]'"
	echo
	echo "To print only what would be done run:"
	echo "	'${0} printonly [ <packages> | <path> ]'"
	echo
	echo "To recreate the default database with all packages being checked execute:"
	echo "	'${0} ${JAVA_PKG_CLASSMAP}'"
	echo
	echo "---------------"
	echo " database file:		/path/to/classmap.gcjdb"
	echo " packages:		comma-separated list of packages from 'java-config -l'"
	echo " path:			fetch Jar files recursively from path"
}

get_classpath() {
	local classpath
	if [ -d "${@}" ] ; then
		local jar
		for jar in $(find ${@} -type f -name '*.jar') ; do
			[[ ( -f "${jar}" ) && ( ".jar" == "${jar: -4:4}" ) ]] \
				&& classpath="${jar}:${classpath}"
		done
		classpath=${classpath%:}
	else
		classpath="$(java-config --classpath=${@} 2>&1)"
	fi

	if [[ "${classpath}" =~ "ERROR" ]] ; then
		die "A package missing/mispelled?!"
	fi

	echo "${classpath}"
}

check_jar() {
	local ret_val=0
	if [ -L "${1}" ] || [ ".jar" != "${1: -4:4}" ] ; then
		echo -e "\033[01;31mno jarfile:\033[0m ${1}"
		ret_val=1
	elif [ ! -f "${2}" ] ; then
		echo -e "\033[01;31mnot found:\033[0m ${2}"
		ret_val=1
	fi
	return ${ret_val}
}

add_lib() {
	echo "register: ${2}"
	if [ "${DB_FILE}" != "printonly" ] ; then
		${JAVA_PKG_DB_TOOL} -a ${DB_FILE} ${1} ${2} \
			|| die "failed to register jar file"
	fi
}

reg_pkgs() {
	local pkg pkgs
	for pkg in $(java-config -l | cut -d] -f1 | cut -c2-) ; do
		pkgs="${pkg},${pkgs}"
	done
	pkgs="${pkgs//vm,active,the,by,Provided,}"
	reg_classpath "${pkgs%,}"
}

reg_classpath() {
	echo "check classpath ..."
	local classpath="$(get_classpath "${1}")"

	echo "${classpath}"
	echo

	local jar to
	for jar in ${classpath//:/ } ; do
		to="$(dirname ${jar})/lib$(basename ${jar}).so"
		check_jar "${jar}" "${to}" && add_lib "${jar}" "${to}"
	done
}

# errors
if [[ ( ${#} -lt 1 ) || ( ${#} -ge 3 ) ]] ; then
	show_help
	exit 1
fi

if [ ! -x "$(which ${JAVA_PKG_DB_TOOL})" ] ; then
	die "Java database tool unusable!"
fi

DB_FILE="${1}"

if [ "${DB_FILE}" != "printonly" ] ; then
	if [ ! -d "$(dirname ${DB_FILE})" ] ; then
		die "Path to database file missing?!"
	fi

	if [ ".gcjdb" != "${DB_FILE: -6:6}" ] ; then
		die "Given file has unknown format?!"
	fi
fi

# start
echo "(re-)create classmap database (${DB_FILE})"
echo
if [ "${DB_FILE}" != "printonly" ] ; then
	rm -f ${DB_FILE}
	${JAVA_PKG_DB_TOOL} -n ${DB_FILE}
fi

if [ -n "${2}" ] ; then
	reg_classpath "${2}"
else
	reg_pkgs
fi

echo "... done!"
exit 0