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#!/usr/bin/make -f
# Install paths
DESTDIR ?=
MAVEN_LOCAL_REPO ?= ~/.m2
# Utilities
XMLSTARLET = xml
FIND = find
JAVAC = javac
INSTALL = install
MKDIRS = mkdir -p
RM = rm -f
JAR = jar
# Detect information from POMs
artifact := $(shell $(XMLSTARLET) sel -T -t -c /_:project/_:artifactId -n pom.xml)
version := $(firstword $(shell $(XMLSTARLET) sel -T -t -c /_:project/_:version -n -c /_:project/_:parent/_:version pom.xml) $(version))
group := $(firstword $(shell $(XMLSTARLET) sel -T -t -c /_:project/_:groupId -n -c /_:project/_:parent/_:groupId pom.xml))
srcdir := $(firstword $(shell $(XMLSTARLET) sel -T -t -c /_:project/_:build/_:sourceDirectory -n pom.xml) $(srcdir) src/main/java)
mvn_subdirs := $(patsubst %/pom.xml,%,$(wildcard */pom.xml))
subdirs := $(if $(subdirs),$(filter $(mvn_subdirs),$(subdirs)),$(mvn_subdirs))
targets := pom $(if $(wildcard src/main/ $(srcdir)),jar)
################################################################################
dep_dir = $1 $(shell $(FIND) $1 2>/dev/null)
dep_optdir = $(shell $(FIND) $1 2>/dev/null)
# all
all: PHONY \
$(addprefix target/$(artifact)-$(version).,$(targets)) \
$(addsuffix /all,$(subdirs))
target/$(artifact)-$(version).pom: pom.xml
$(INSTALL) -Dm644 $< $@
target/$(artifact)-$(version).jar: \
target/META-INF/maven/$(group)/$(artifact)/pom.properties \
target/META-INF/maven/$(group)/$(artifact)/pom.xml \
$(call dep_dir,target/classes) \
$(call dep_optdir,src/main/resources)
$(MKDIRS) $(@D)
$(JAR) -cf $@ -C target META-INF -C target/classes . $(if $(wildcard src/main/resources),-C src/main/resources .)
target/META-INF/maven/$(group)/$(artifact)/pom.xml: pom.xml
install -Dm644 $< $@
target/META-INF/maven/$(group)/$(artifact)/pom.properties: pom.xml
$(MKDIRS) $(@D)
printf '%s\n' \
'#Generated by Make' \
"#$$(LC_ALL=C date)" \
'version=$(version)' \
'groupId=$(group)' \
'artifactId=$(artifact)' \
> $@
target/classes: $(call dep_optdir,$(srcdir))
$(MKDIRS) $@
$(if $^,$(FIND) $(srcdir) -name '*.java' -exec $(JAVAC) -d $@ {} + || { $(RM) -r $@; exit 1; })
# install
install: PHONY \
$(addprefix $(DESTDIR)$(MAVEN_LOCAL_REPO)/$(subst .,/,$(group))/$(artifact)/$(version)/$(artifact)-$(version).,$(targets)) \
$(addsuffix /install,$(subdirs))
$(DESTDIR)$(MAVEN_LOCAL_REPO)/$(subst .,/,$(group))/$(artifact)/$(version)/%: target/%
$(INSTALL) -Dm644 $< $@
# clean
clean: PHONY $(addsuffix /clean,$(subdirs))
rm -rf target
# recurse
$(addsuffix /%,$(subdirs)): PHONY
srcdir='$(srcdir)' version='$(version)' $(MAKE) -C $(@D) -f '$(abspath $(firstword $(MAKEFILE_LIST)))' '$(@F)'
# boilerplate
.PHONY: PHONY FORCE
.DELETE_ON_ERROR:
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