#!/bin/sh
#
# make-luacheck-files.sh
# v1 - E - Initial version

set -ue

if [ ! -d "mods" ] || [ ! -r ".luacheck.head" ]; then
	printf "error: this script needs to be run from the mineclonia project root\n" 1>&2
	exit 1
fi

# We need these to be explicitly NOT expanded.
# shellcheck disable=2016
{
	# This creates a luacheckrc-compatible line from a mod (supplied on
	# the command line with -v MOD="mod_name"), a directory (-v DIR="..."),
	# and a list of dependencies (via STDIN). The `read_globals` section is
	# skipped if there are no dependencies (-v EMPTY=1).
	AWK_DEPS2LCHECK='
	BEGIN {
		printf("files[\"" DIR "\"] = { globals = { \"" MOD "\" }");
		if (!EMPTY) {
			printf(", read_globals = { ");
		}
	};

	# Without a pattern, this will match on empty lines
	# and mess up the entry. We clean up the extra commas
	# later in the script.
	/.+/{
		sub("?$", "");
		sub("\xd", "");
		printf("\"" $1 "\", ");
	};

	END {
		if (!EMPTY) {
			printf("}");
		}
		printf(" }\n");
	};'

	# This takes any line that contains 'depends' and an equal sign
	# and spits out each (comma-separated) entry on its own line.
	SED_MODCONF2DEPS='
	/depends *=/{
		s/.*depends *=//;
		s/, ?/\n/g;
		p;
	}'

	HEADER='
-------------------------------------------------------------------
-- THIS FILE WAS AUTOGENERATED BY tools/make-luacheck-files.sh ! --
--    DO NOT EDIT BY HAND. YOUR CHANGES WILL BE LOST NEXT RUN!   --
-------------------------------------------------------------------

'
}

find mods -type d -print | while read -r DIR; do
	if [ -r "$DIR/depends.txt" ]; then
		printf "found: %s (%s)\n" "$DIR" "depends.txt" 1>&2
		# depends.txt is a simple newline-delimited file,
		# so we can just read it in.
		DEPS="$(cat "$DIR/depends.txt")"
	elif [ -r "$DIR/mod.conf" ]; then
		printf "found: %s (%s)\n" "$DIR" "mod.conf" 1>&2
		# mod.conf needs some more help to get usable
		# data out of it.
		DEPS="$(sed -n -r -e "$SED_MODCONF2DEPS" "$DIR/mod.conf")"
	else
		# Empty dir, or not a mod dir.
		continue
	fi

	EMPTY=0
	if [ -z "$DEPS" ]; then
		EMPTY=1
	fi

	# Get only the last chunk of the directory
	# for the mod name.
	MOD="${DIR##*/}"

	# Now we run through it through the formatter,
	# and remove any rogue trailing commas.
	{ awk -v DIR="$DIR" -v EMPTY="$EMPTY" -v MOD="$MOD" -- "$AWK_DEPS2LCHECK" | sed -e "s/, }/ }/"; } <<-EOF
		$DEPS
	EOF
done > .luacheck.files

# Put the final thing together with the warning header
{ printf "%s" "$HEADER"; cat .luacheck.head .luacheck.files; } > .luacheckrc