Merge pull request honza#736 from codeinabox/makefile-help

Snippet for `help` target for self-documented Makefile

Author: lpil

snippets/make.snippets

@@ -43,3 +43,8 @@ snippet el
 # .DEFAULT_GOAL := target
 snippet default
 	.DEFAULT_GOAL := ${1}
+# help target for self-documentated Makefile
+snippet help
+	help: ## Prints help for targets with comments
+		@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $\$1, $\$2}'
+	${0}