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Auto help command for Makefile
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| ## https://stackoverflow.com/a/35730928/12168211 | |
| ## Automatic help command | |
| ## Comment directly before target name used as help | |
| .PHONY: help | |
| # Show this help. | |
| help: | |
| @awk '/^#/{c=substr($$0,3);next}c&&/^[[:alpha:]][[:alnum:]_-]+:/{print substr($$1,1,index($$1,":")),c}1{c=0}' $(MAKEFILE_LIST) | column -s: -t |
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