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#!/usr/bin/make -f
# Install paths
DESTDIR ?=
MAVEN_LOCAL_REPO ?= ~/.m2
# Utilities
CP = cp
ECHO = echo
EXISTS = test -e
FAIL = exit 1
FIND = find
INSTALL = install
JAR = jar
JAVA = java
JAVAC = javac
MKDIRS = mkdir -p
PRINTF = printf
RM = rm -f
SED = sed
TOUCH = touch
XMLSTARLET = xml
JAVAC_FLAGS += $(if $(maven.compiler.source),-source $(maven.compiler.source))
JAVAC_FLAGS += $(if $(maven.compiler.target),-target $(maven.compiler.target))
JAVAC_FLAGS += $(if $(project.build.sourceEncoding),-encoding $(project.build.sourceEncoding))
# Detect information from POMs
pom_get = $(shell $(XMLSTARLET) sel -T -t $(foreach xpath,$1, -c $(subst /,/_:,$(xpath)) -n) pom.xml)
artifactId := $(call pom_get,/project/artifactId)
version := $(firstword $(call pom_get,/project/version /project/parent/version) $(value version))
groupId := $(firstword $(call pom_get,/project/groupId /project/parent/groupId))
sourceDirectory := $(firstword $(call pom_get,/project/build/sourceDirectory ) $(value sourceDirectory) src/main/java )
resources := $(firstword $(call pom_get,/project/build/resources ) $(value resources) src/main/resources)
maven.compiler.source := $(firstword $(call pom_get,/project/properties/maven.compile.source \
/project/properties/maven.compiler.source ) $(value maven_compiler_source) )
maven.compiler.target := $(firstword $(call pom_get,/project/properties/maven.compile.target \
/project/properties/maven.compiler.target ) $(value maven_compiler_target) )
project.build.sourceEncoding := $(firstword $(call pom_get,/project/properties/project.build.sourceEncoding) $(value project_build_sourceEncoding) )
basedir = .
project.basedir = $(basedir)
subdirs = $(patsubst %/pom.xml,%,$(wildcard */pom.xml))
targets = pom $(if $(wildcard src/main/ $(sourceDirectory) $(resources)),jar)
# Post-processing
inherit_vars = version sourceDirectory resources maven.compiler.source maven.compiler.target project.build.sourceEncoding
$(foreach var,$(inherit_vars),$(eval $(var) = $($(var))))
$(if $(extra_makefiles),$(eval include $(extra_makefiles)))
subdirs := $(subdirs)
targets := $(targets)
################################################################################
dep_dir = $1 $(shell $(FIND) $1 2>/dev/null)
dep_optdir = $(shell $(FIND) $1 2>/dev/null)
all: PHONY \
$(addprefix target/$(artifactId)-$(version).,$(targets)) \
$(addsuffix /all,$(subdirs))
# generate-sources #############################################################
target/generated-sources:
$(if $^,for dep in $^; do $(EXISTS) $$dep || { $(RM) -r $@; $(FAIL); }; done,$(MKDIRS) $@)
$(TOUCH) $@
# generate-resources ###########################################################
target/generated-resources: \
target/generated-resources/META-INF/maven/$(groupId)/$(artifactId)/pom.properties \
target/generated-resources/META-INF/maven/$(groupId)/$(artifactId)/pom.xml
for dep in $^; do $(EXISTS) $$dep || { $(RM) -r $@; $(FAIL); }; done
$(TOUCH) $@
target/generated-resources/META-INF/maven/$(groupId)/$(artifactId)/pom.xml: pom.xml
$(INSTALL) -Dm644 $< $@
# This is almost the default date format for locale=C, but the DOM is
# 0-padded instead of space-padded.
target/generated-resources/META-INF/maven/$(groupId)/$(artifactId)/pom.properties: pom.xml
$(MKDIRS) $(@D)
$(PRINTF) '#Generated by %s\n#%s\n\nversion=%s\ngroupId=%s\nartifactId=%s\n' \
Make "$$(LC_ALL=C date '+%a %b %d %H:%M:%S %Z %Y')" '$(version)' '$(groupId)' '$(artifactId)' \
> $@
# compile ######################################################################
# Maven puts `target/classes` in the classpath, but that's unnecessary
# here, as we don't do incremental/segmented compilation.
target/classes: \
$(call dep_optdir,$(sourceDirectory) $(resources)) \
$(call dep_dir,target/generated-sources target/generated-resources)
$(RM) -r $@
$(MKDIRS) $@
$(FIND) $(wildcard $(resources) target/generated-resources) -mindepth 1 -maxdepth 1 -exec $(CP) -r {} $@ \; || { $(RM) -r $@; $(FAIL); } # process-resources
$(FIND) $(wildcard $(sourceDirectory) target/generated-sources) -name '*.java' -exec $(JAVAC) $(JAVAC_FLAGS) -d $@ {} + || { $(RM) -r $@; $(FAIL); } # compile
$(TOUCH) $@
# package ######################################################################
target/$(artifactId)-$(version).pom: pom.xml
$(INSTALL) -Dm644 $< $@
target/$(artifactId)-$(version).jar: target/classes
$(JAR) -cf $@ -C $< .
# install ######################################################################
mvndir = $(subst .,/,$(groupId))/$(artifactId)/$(version)
install: PHONY \
$(addprefix $(DESTDIR)$(MAVEN_LOCAL_REPO)/$(mvndir)/$(artifactId)-$(version).,$(targets)) \
$(addsuffix /install,$(subdirs))
$(DESTDIR)$(MAVEN_LOCAL_REPO)/$(mvndir)/%: target/%
$(INSTALL) -Dm644 $< $@
# clean ########################################################################
clean: PHONY $(addsuffix /clean,$(subdirs))
rm -rf target
# recurse ######################################################################
deps2jars = $(wildcard $(patsubst %/all,%/target/*.jar,$(filter $(addsuffix /all,$(subdirs)),$1)))
deps2classpath = $(shell $(ECHO) $(abspath $(call deps2jars,$1)) $(CLASSPATH) | $(SED) 'y/ /:/')
define recurse-rule
$1/%: PHONY $(addsuffix /all,$($1_deps))
CLASSPATH='$$(call deps2classpath,$$^)' $(foreach var,$(inherit_vars),$(subst .,_,$(var))='$$(value $(var))') $$(MAKE) -C '$1' -f '$$(abspath $$(firstword $$(MAKEFILE_LIST)))' '$$*'
endef
$(foreach subdir,$(subdirs),$(eval $(call recurse-rule,$(subdir))))
# boilerplate ##################################################################
.PHONY: PHONY FORCE
.DELETE_ON_ERROR:
.SECONDARY:
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