BUILDDIR := build
DIRS := $(shell ls -d */)

.PHONY: build
build:
	mkdir -p $(BUILDDIR); \
	for dir in $(DIRS); do \
	    if [ ! -f "$$dir/main.go" ]; then \
	        continue; \
	    fi; \
		pkg=$${dir%/}; \
		go build -o $(BUILDDIR)/$$pkg ./$$dir/main.go; \
	done

.PHONY: test
test:
	for bin in $(BUILDDIR)/*; do \
	    echo "\n"; \
		$$bin; \
	done; \
	echo "\nAll Go examples executed.\n"

.PHONY: clean
clean:
	rm -rf $(BUILDDIR)/*

.PHONY: all
all: build test clean