add build,dist, move sha calc out of archive

Makefile

@@ -3,52 +3,59 @@ OS_BUILDS = linux darwin windows
 
 APP := gotp
 BUILD_DIR := "build"
-SHA_FILE := $(APP)-sha256.txt
-LIC_FILE := LICENSE
+
+SHA_FILE = sha256.txt
+LIC_FILE = LICENSE
 
 GO_LDFLAGS = "-s -extldflags=-static"
 
-all: rmbuild $(OS_BUILDS) checksum archive
+# Builds all binaries to BUILD_DIR/{linux,darwin,windows}
+build: clean $(OS_BUILDS)
+
+# Builds all binaries, archives with LIC_FILE, and creates sha256sum
+dist: clean $(OS_BUILDS) archive checksum
 
+# Builds binary and outputs to BUILD_DIR/linux
 linux:
 	@GOOS=linux CGO_ENABLED=0 go build -ldflags=$(GO_LDFLAGS) -o build/linux/$(APP)
 	@echo "output build/linux/$(APP)"
 
+# Builds binary and outputs to BUILD_DIR/darwin
 darwin:
 	@GOOS=darwin go build -ldflags=$(GO_LDFLAGS) -o build/darwin/$(APP)
 	@echo "output build/darwin/$(APP)"
 
+# Builds binary and outputs to BUILD_DIR/windows
 windows:
 	@GOOS=windows go build -ldflags=$(GO_LDFLAGS) -o build/windows/$(APP).exe
 	@echo "output build/windows/$(APP).exe"
 
+# Creates archives for distribution
 archive:
 	@echo "Creating tar/zip archives"
 	@for os in $(OS_BUILDS); do \
-		if [ "$$os" = "windows" ]; then \
 			echo "Creating zip archive for $$os"; \
+		if [ "$$os" = "windows" ]; then \
 			cp -a $(LIC_FILE) $(BUILD_DIR)/$$os/$(LIC_FILE).txt; \
 			zip -r $(BUILD_DIR)/$(APP)-$$os-v$(VERSION).zip -j $(BUILD_DIR)/$$os/; \
 		else \
-			echo "Creating tar archive for $$os"; \
 			cp -a $(LIC_FILE) $(BUILD_DIR)/$$os/; \
-			tar -cf $(BUILD_DIR)/$(APP)-$$os-v$(VERSION).tar -C $(BUILD_DIR)/$$os $(APP) $(LIC_FILE) $(SHA_FILE); \
+			tar -cf $(BUILD_DIR)/$(APP)-$$os-v$(VERSION).tar -C $(BUILD_DIR)/$$os $(APP) $(LIC_FILE); \
 		fi \
 	done
 
+# Creates sha256sum for distribution
 checksum:
 	@echo "Creating checksum hashes"
 	@for os in $(OS_BUILDS); do \
-		( \
-			cd $(BUILD_DIR)/$$os && \
 			if [ "$$os" = "windows" ]; then \
-				sha256sum $(APP).exe > $(SHA_FILE); \
+				sha256sum $(BUILD_DIR)/$(APP)-$$os-v$(VERSION).zip > $(BUILD_DIR)/$(APP)-$$os-v$(VERSION)-$(SHA_FILE); \
 			else \
-				sha256sum $(APP) > $(SHA_FILE); \
+				sha256sum $(BUILD_DIR)/$(APP)-$$os-v$(VERSION).tar > $(BUILD_DIR)/$(APP)-$$os-v$(VERSION)-$(SHA_FILE); \
 			fi \
-		) \
 	done
 
-rmbuild:
-	@rm -rf $(BUILD_DIR)
+# Removes BUILD_DIR
+clean:
 	@echo "Removing $(BUILD_DIR) dir"
+	@rm -rf $(BUILD_DIR)