Checking how makefile build help to remove gawk dependency

Makefile

@@ -54,13 +54,43 @@ release:
 	@goreleaser release --skip-publish --rm-dist
 
 .PHONY: help
-## Display this help screen - requires gawk
-help:
-	@gawk 'match($$0, /^## (.*)/, a) \
-		{ getline x; x = gensub(/(.+:) .+/, "\\1", "g", x) ; \
-		printf "\033[36m%-30s\033[0m %s\n", x, a[1]; }' $(MAKEFILE_LIST) | sort
 
 .PHONY: build
 ## Builds binary from source
 build:
 	CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags "$(LD_FLAGS)" -o dist/dirstalk cmd/dirstalk/main.go
+
+.PHONY: build
+HELP_WIDTH="                       "
+## Display makefile help
+help:
+	@printf "Usage\n";
+	@awk '{ \
+			if ($$0 ~ /^.PHONY: [a-zA-Z\-\_0-9]+$$/) { \
+				helpCommand = substr($$0, index($$0, ":") + 2); \
+				if (helpMessage) { \
+					printf "  \033[32m%-20s\033[0m %s\n", \
+						helpCommand, helpMessage; \
+					helpMessage = ""; \
+				} \
+			} else if ($$0 ~ /^[a-zA-Z\-\_0-9.]+:/) { \
+				helpCommand = substr($$0, 0, index($$0, ":")); \
+				if (helpMessage) { \
+					printf "  \033[32m%-20s\033[0m %s\n", \
+						helpCommand, helpMessage; \
+					helpMessage = ""; \
+				} \
+			} else if ($$0 ~ /^##/) { \
+				if (helpMessage) { \
+					helpMessage = helpMessage"\n"${HELP_WIDTH}substr($$0, 3); \
+				} else { \
+					helpMessage = substr($$0, 3); \
+				} \
+			} else { \
+				if (helpMessage) { \
+					print "\n"${HELP_WIDTH}helpMessage"\n" \
+				} \
+				helpMessage = ""; \
+			} \
+		}' \
+$(MAKEFILE_LIST)

README.md

@@ -102,11 +102,10 @@ make build                                   # to build an executable for your h
 
 [dep](https://github.com/golang/dep) is the tool of choice for dependency management.
 
-If you have [gawk](https://www.gnu.org/software/gawk/) available in your PATH you can also just launch
 ```bash
 make help
 ```
-to obtain a description of every command available in the Makefile.
+will print a description of every command available in the Makefile.
 
 Wanna add a functionality? fix a bug? fork and create a PR.