sources=$(wildcard src/*.scala)
main=Main

all: target/library.jar

# contains jars of all dependencies (including transitive ones)
target/dependencies.list: Maven.list
	mkdir -p target
	coursier fetch $(shell sed '/^#/d' Maven.list) > $@

# concatenate dependencies to be parseable as a classpath argument
target/classpath.line: target/dependencies.list
	paste --serial --delimiters ':' $^ > $@

# compile scala source files (note that a stamp file is used, since
# many classfiles may be created per source file)
target/classfiles.stamp: $(sources) target/classpath.line
	mkdir -p target/classfiles
	scalac \
	  -d target/classfiles \
	  -cp $(shell cat target/classpath.line) \
	  -target:jvm-1.8 \
	$(sources)
	touch target/classfiles.stamp

# bundle classfiles into a jar
target/library.jar: target/classfiles.stamp
	jar cf $@ -C target/classfiles .

# combine lirary jar with all dependencies to produce a fat jar
target/application.jar: target/library.jar target/dependencies.list
	mkdir -p target
	scripts/combinejars $@ $(shell cat target/dependencies.list) $<

# inject a startup script to the fat jar, producing an executable
target/application: target/application.jar
	echo "#!/bin/sh" > target/application
	echo 'exec java -cp $$0 $(main) "$$@"' >> target/application
	cat target/application.jar >> target/application
	chmod +x target/application

# run the application
run: target/application.jar
	@java -cp $< $(main)

# format source files
fmt:
	scalafmt $(sources)

clean:
	rm -rf target

.PHONY: clean all