Sime makelike wrapper scripts support

[Ron Yorston]

Boris Kotov wrote:
>It would be really handy to have a simple Makefile-like wrapper scripts 
>syntax just to execute some common commands on it:

If the Makefiles you want to execute are as simple as the example
you quoted (so you don't need things like make variables) the attached
script will munge a Makefile into a shell script and then run it.

To see the generated script run 'minimake -v non_target'.

Modern versions of BusyBox allow shell scripts to be embedded in the
binary.  The script is compressed so in this case it only adds about
450 bytes to the size of the executable.

Ron
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#!/bin/sh

MAKEFILE="Makefile"
if [ $# -gt 2 ] && [ "$1" = "-f" ]
then
	MAKEFILE="$2"
	shift
	shift
fi

(
	INCASE=0

	while read -r REPLY
	do
		case $REPLY in
		*:)
			if [ $INCASE -eq 0 ]
			then
				printf "if [ \$# -eq 0 ]\n"
				printf "then\n"
				printf "\tTARGET=\"%s\"\n" "${REPLY%:}"
				printf "else\n"
				printf "\tTARGET=\"\$1\"\n"
				printf "fi\n"
				printf "case \"\$TARGET\" in\n"
			else
				printf "\t;;\n"
			fi
			printf "%s)\n" "${REPLY%:}"
			INCASE=1
			;;
		"") ;;
		*) printf "\t%s\n" "${REPLY##[ 	]}";;
		esac
	done <"$MAKEFILE"

	if [ $INCASE -eq 1 ]
	then
		printf "\t;;\n"
	fi
	printf "*)\n"
	printf "\techo \"No rule to make target '\$1'\"\n"
	printf "\t;;\n"
	printf "esac\n"
) | sh -s "$@"