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ARTIFACT_ID  != xmllint --xpath "/*[local-name()='project']/*[local-name()='artifactId']/text()" pom.xml
VERSION      != xmllint --xpath "/*[local-name()='project']/*[local-name()='version']/text()"    pom.xml
JAVA_VERSION != xmllint --xpath "/*[local-name()='project']/*[local-name()='properties']/*[local-name()='java.version']/text()"    pom.xml

JC           = JAVA_VERSION=${JAVA_VERSION} javac
MVN          = mvn
JAVA         = JAVA_VERSION=${JAVA_VERSION} java -classpath `cat .classpath`
JDB          = jdb
BUILD_DIR    = target
JAR          = ${BUILD_DIR}/${ARTIFACT_ID}-${VERSION}.jar
MVN_FLAGS    =
DBG_PORT     = 1044
SRC_PATH     = src/main/java
SRC         != find src -name '*.java'
OBJ         != find src -name '*.java' | sed -E 's/^src\/main\/java/target\/classes/g' | sed -E 's/^src\/test\/java/target\/test-classes/g' | sed -E 's/\.java$$/\.class/g'
DBG_PORT     = 1044
DBG_FLAGS    = -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=${DBG_PORT}

all: .classpath ${OBJ}

run: .classpath .main-class
	${JAVA} `cat .main-class` ${ARGS}

debug: .classpath .main-class
	${JAVA} ${DBG_FLAGS} `cat .main-class` ${ARGS}

debugger:
	${JDB} -sourcepath ${SRC_PATH} -attach ${DBG_PORT}

.main-class:
	@echo ${SRC} | tr ' ' '\n' | fzf | sed -E 's/.*java\/(.*)\.java/\1/g' | tr '/' '.' > $@

.classpath: pom.xml
	${MVN} ${MVN_FLAGS} dependency:build-classpath -Dmdep.outputFile=$@
	@echo -n ':'target/classes >> $@

.classes: ${SRC}
	for jar in `cat .classpath | tr ':' '\n' | grep -E '\.jar$$'`; do \
		jar tvf $$jar | awk '{ print $$8 }'; \
	done | grep -E '\.class$$' | grep -v package-info.class | sed -E 's/\$$[0-9]*//g' | sort | uniq > $@
	@echo ${SRC} | tr ' ' '\n' >> $@

clean:
	@rm -rf ${BUILD_DIR}

buildmk:
	@for i in `find src -name *.java`; do \
		echo -n $$i | sed -E 's/^src\/main\/java(.*).java/target\/classes\1\.class: /g' | sed -E 's/^src\/test\/java(.*).java/target\/test-classes\1\.class: /g'; \
		echo $$i; \
		echo -n '	$${JC} -classpath `cat .classpath` '; \
		echo $$i; \
		echo '	mkdir -p `dirname $$@`'; \
		echo -n '	mv ';\
		echo $$i | sed 's/\.java$$/.class $$@/g'; \
		echo ''; \
	done > objs.mk

.tags:
	exctags -Rnf $@