add 'make release' target

Author: stang

Makefile

@@ -1,25 +1,43 @@
 CMD_PATH := cmd/git-remote-https+iap
 CMD_NAME := git-remote-https+iap
+BUILD_TARGETS := \
+	darwin-amd64 \
+	linux-amd64
 
-BIN_PATH := dist/bin/
+DIST_PATH := dist/
+BIN_PATH := $(DIST_PATH)bin/
+RELEASE_PATH := $(DIST_PATH)releases/
 
 version := $(shell git describe --match "v*.*" --abbrev=7 --tags --dirty)
 build_args := -ldflags "-X main.version=${version}"
+tar_xform_arg := $(shell tar --version | grep -q 'GNU tar' && echo '--xform' || echo '-s')
+tar_xform_cmd := $(shell tar --version | grep -q 'GNU tar' && echo 's')
 
 .PHONY: all
 all: build
 
-$(BIN_PATH):
+$(BIN_PATH) $(RELEASE_PATH):
 	mkdir -p $@
 
-build: $(BIN_PATH)
-	env CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build ${build_args} -o $(BIN_PATH)${CMD_NAME}-darwin-amd64 ${CMD_PATH}/*.go
-	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build ${build_args} -o $(BIN_PATH)${CMD_NAME}-linux-amd64 ${CMD_PATH}/*.go
+BUILDS := $(foreach target, $(BUILD_TARGETS), $(BIN_PATH)$(CMD_NAME)-$(target))
+$(BUILDS): OS   = $(word 1, $(subst -, ,$(subst $(CMD_NAME)-,,$(notdir $@))))
+$(BUILDS): ARCH = $(word 2, $(subst -, ,$(subst $(CMD_NAME)-,,$(notdir $@))))
+$(BUILDS): $(BIN_PATH)
+	env CGO_ENABLED=0 GOOS=$(OS) GOARCH=$(ARCH) go build ${build_args} -o $(BIN_PATH)${CMD_NAME}-$(OS)-$(ARCH) ${CMD_PATH}/*.go
+build: $(BUILDS)
+
+RELEASE_INCLUDES = README.md
+RELEASE_TARGETS := $(foreach target, $(BUILDS), $(RELEASE_PATH)$(notdir $(target))-$(version).tar.gz)
+$(RELEASE_TARGETS): $(RELEASE_PATH)%-$(version).tar.gz: $(BIN_PATH)% $(RELEASE_INCLUDES)
+	mkdir -p $(RELEASE_PATH)
+	tar $(tar_xform_arg) '$(tar_xform_cmd)!$(BIN_PATH)$(CMD_NAME).*!$(CMD_NAME)!' -czf $@ $^
+	cd $(RELEASE_PATH) && shasum -a 256 $(notdir $@) >$(notdir $@).sha256
+release: $(RELEASE_TARGETS)
 
 .PHONY: version
 version:
 	@echo "$(version)"
 
 .PHONY: clean
 clean:
-	rm -rf $(BIN_PATH)
+	rm -rf $(DIST_PATH)