amazing-makefile

README.md

tl;dr running make help prints:

Usage: make TARGET
help:
        Print this help
hello:
        Print hello and exit
        Really, that's pretty much it.
        
world:
        Print world and exit

Makefile

help:
        @: # Print this help
        @printf 'Usage: make TARGET\n'
        @awk ' \
                /^[^\t:]+:/ { \
                        split($$0, s, ":"); \
                        cmd=s[1]; \
                } /^\t@: #/ { \
                        split($$0, t, ": # "); \
                        body=t[2]; \
                        doprnt=1; \
                } { \
                        if (doprnt == 1) { \
                                if (cmd != "") { \
                                        printf("\n\033[33m%s\033[0m:\n", cmd); \
                                        cmd="" \
                                }; \
                                printf("\t%s\n", body); \
                                doprnt=0; \
                                body=""; \
                        }; \
                } \
        ' Makefile
hello:
        @: # Print hello and exit
        @: #
        @: # Really, that's pretty much it.
        echo hello
world:
        @: # Print world and exit
        echo world
.PHONY: help hello world