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DESTDIR ?=
JAR_DIR ?= /usr/share/java
MAVEN_LOCAL_REPO ?= ~/.m2

ANT = ant
EGREP = grep -E
EXISTS = test -e
FAIL = exit 1
FIND = find
INSTALL = install
PRINTF = printf
RM = rm -f
TOUCH = touch

artifactId = jarjar-plugin
version    = 1.4
groupId    = com.tonicsystems.jarjar

dep_dir = $1 $(shell $(FIND) $1 2>/dev/null)

findjar = $(firstword $(shell IFS=:; $(PRINTF) '%s\n' $$CLASSPATH | $(EGREP) '/$1(-[0-9.-]*)?\.jar$$') /notfound.jar)
asm_jar = $(call findjar,asm)
asm_commons_jar = $(call findjar,asm-commons)

all: PHONY dist

dist: $(call dep_dir,src maven) lib/asm-4.0.jar lib/asm-commons-4.0.jar
	$(RM) -r $@ build
	# javadoc doesn't work; hence using 'jar' instead of 'dist'
	$(ANT) jar mojo || { $(RM) -r $@ build; $(FAIL); }
	$(TOUCH) $@

lib/asm-4.0.jar: $(asm_jar)
	$(INSTALL) -Dm644 $< $@
lib/asm-commons-4.0.jar: $(asm_commons_jar)
	$(INSTALL) -Dm644 $< $@

dist/%.jar: dist
	$(EXISTS) $@
	$(TOUCH) $@
dist/maven/pom.xml: dist
	$(EXISTS) $@
	$(TOUCH) $@

install-base = $(DESTDIR)$(MAVEN_LOCAL_REPO)/$(subst .,/,$(groupId))/$(artifactId)/$(version)/$(artifactId)-$(version)
install: PHONY $(install-base).pom $(install-base).jar $(DESTDIR)$(JAR_DIR)/jarjar-$(version).jar

$(install-base).pom: dist/maven/pom.xml
	$(INSTALL) -Dm644 $< $@
$(install-base).jar: dist/jarjar-plugin-$(version).jar
	$(INSTALL) -Dm644 $< $@
$(DESTDIR)$(JAR_DIR)/jarjar-$(version).jar: dist/jarjar-$(version).jar
	$(INSTALL) -Dm644 $< $@

clean: PHONY
	$(RM) -r dist build lib/*.jar

.PHONY: PHONY
.DELETE_ON_ERROR:
.SECONDARY: