Add /fixlight chat command

builtin/game/chatcommands.lua

@@ -487,6 +487,25 @@ core.register_chatcommand("deleteblocks", {
 	end,
 })
 
+core.register_chatcommand("fixlight", {
+	params = "(here [radius]) | (<pos1> <pos2>)",
+	description = "Resets lighting in the area between pos1 and pos2",
+	privs = {server = true},
+	func = function(name, param)
+		local p1, p2 = parse_range_str(name, param)
+		if p1 == false then
+			return false, p2
+		end
+
+		if core.fix_light(p1, p2) then
+			return true, "Successfully reset light in the area ranging from " ..
+				core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
+		else
+			return false, "Failed to load one or more blocks in area"
+		end
+	end,
+})
+
 core.register_chatcommand("mods", {
 	params = "",
 	description = "List mods installed on the server",