bake/awake

#!/bin/sh
# vim:set ft=awk:
# Written by Egor, modified for compatibility by Emil.
# SPDX-License-Identifier: Unlicense
"exec" "${AWK:-awk}" "-f" "$(basename $0)" "--" "$@" && 0
function usage() {
	print "awake: usage: awake [-nl] [-s num] filename [args...]"
	exit
}
BEGIN {
	RS = "\r?\n"
	FS = "\n"
	select = 1
	for (i = 1; i < ARGC; i++) {
		if (!optsdone && substr(ARGV[i], 1, 1) == "-") {
			if (ARGV[i] == "--") {
				optsdone = 1
			} else {
				for (j = 2; j <= length(ARGV[i]); j++) {
					c = substr(ARGV[i], j, 1)
					if (c == "s") {
						select = substr(ARGV[i], j+1)
						if (!select) {
							ARGV[i] = ""
							select = ARGV[++i]
						}
						if (select !~ /^[0-9]+$/) {
							print "awake: junk -s argument: "select
							usage()
						}
						break
					} else if (c == "n") {
						dryrun = 1
					} else if (c == "l") {
						list = 1
					} else {
						print "awake: unknown option: -"c
						usage()
					}
				}
			}
			ARGV[i] = ""
		} else if (hasfilename) {
			if (extraargs) {
				extraargs = extraargs" "ARGV[i]
			} else {
				extraargs = ARGV[i]
			}
			ARGV[i] = ""
		} else {
			if (index(ARGV[i], "=")) {
				print "awake: bad filename: "ARGV[i]
				usage()
			}
			hasfilename = 1
			shortname = filename = ARGV[i]
			sub(/.*\//, "", shortname)
			sub(/[.][^.]*/, "", shortname)
		}
	}
	if (!hasfilename) {
		usage()
	}
}
/@BAKE[ ]/ {
	bakenum++
	sub(/.*@BAKE[ ]/, "")
	sub(/ *@STOP.*/, "")
	if (list) {
		print bakenum": "$0
	} else if (select == bakenum) {
		gsub(/\$@|@FILE/, filename)
		gsub(/\$\*|@SHORT/, shortname)
		gsub(/\$\+|@ARGS/, extraargs)
		gsub(/@RECURS/, ARGV[0])
		print "Awake: " $0
        printf "Output: "
		if (!dryrun) {
			system($0)
            print ""
		}
	}
}