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Help target for self-documentation of a Makefile
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| .SILENT: | |
| .PHONY: help | |
| # Based on https://gist.github.com/prwhite/8168133#comment-1313022 | |
| ## This help screen | |
| help: | |
| printf "Available targets\n\n" | |
| awk '/^[a-zA-Z\-\_0-9]+:/ { \ | |
| helpMessage = match(lastLine, /^## (.*)/); \ | |
| if (helpMessage) { \ | |
| helpCommand = substr($$1, 0, index($$1, ":")-1); \ | |
| helpMessage = substr(lastLine, RSTART + 3, RLENGTH); \ | |
| printf "%-15s %s\n", helpCommand, helpMessage; \ | |
| } \ | |
| } \ | |
| { lastLine = $$0 }' $(MAKEFILE_LIST) | |
| ## Another dummy task | |
| another-dummy-task: | |
| echo dummy |
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helpCommand = substr($$1, 0, index($$1, ":")-1); truncated last letter of my command, need to remove -1 on my debian 9