tools: remove inline scripting from make-luacheck-files

- the awk script was moved to its own file (deps-to-luacheck.awk) with
  minor changes, including added commentary, slightly more rigorous error
  checking, and using a different separator model to avoid a second
  stage to remove trailing commas
- SED_MODCONF2DEPS was moved to a containing function, and commented
- the awk command itself is now easier on the eyes

tools/deps-to-luacheck.awk

@@ -0,0 +1,41 @@
+BEGIN {
+	if (!DIR || !MOD) {
+		printf("error: DIR and MOD must be set.\n");
+		_panic=1;
+		exit 1;
+	}
+
+	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.
+/.+/{
+	# Get rid of the optional (?) mark from
+	# depends.txt entries.
+	sub("?$", "");
+
+	# Some files have CRLF, so get rid of those
+	# too.
+	sub("\xd", "");
+
+	SEP=", ";
+	if (NR == 1) {
+		SEP="";
+	}
+	printf(SEP "\"" $1 "\"");
+};
+
+END {
+	if (!_panic) {
+		if (!EMPTY) {
+			printf(" }");
+		}
+		printf(" }\n");
+	}
+};

tools/make-luacheck-files.sh

@@ -2,6 +2,7 @@
 #
 # make-luacheck-files.sh
 # v1 - E - Initial version
+# v2 - E - Remove (most) inline scripts
 
 set -ue
 
@@ -10,53 +11,27 @@ if [ ! -d "mods" ] || [ ! -r ".luacheck.head" ]; then
 	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='
+HEADER='
 -------------------------------------------------------------------
 -- THIS FILE WAS AUTOGENERATED BY tools/make-luacheck-files.sh ! --
 --    DO NOT EDIT BY HAND. YOUR CHANGES WILL BE LOST NEXT RUN!   --
 -------------------------------------------------------------------
 
 '
+
+# This takes any line that contains 'depends' and an equal sign
+# and spits out each (comma-separated) entry on its own line.
+modconf2deps() {
+	sed -n -r -e '
+	# Match any lines like "depends = asdfada"
+	/depends *=/{
+		# Get rid of the "depends =" part
+		s/.*depends *=//;
+		# Convert commas to newlines
+		s/, */\n/g;
+		# Record the output
+		p;
+	}'
 }
 
 find mods -type d -print | while read -r DIR; do
@@ -69,7 +44,7 @@ find mods -type d -print | while read -r DIR; do
 		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")"
+		DEPS="$(modconf2deps < "$DIR/mod.conf")"
 	else
 		# Empty dir, or not a mod dir.
 		continue
@@ -84,10 +59,13 @@ find mods -type d -print | while read -r DIR; do
 	# 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
-		$DEPS
+	# Now we run through it through the formatter
+	awk \
+		-v DIR="$DIR" \
+		-v EMPTY="$EMPTY" \
+		-v MOD="$MOD" \
+		-f tools/deps-to-luacheck.awk <<-EOF
+	$DEPS
 	EOF
 done > .luacheck.files