we_core: fix bugs, add more useful error messages

.luacheckrc

@@ -6,6 +6,7 @@ exclude_files = {
 	"worldeditadditions/utils/bit.lua"
 }
 
+files["worldeditadditions_core/register/check.lua"] = { read_globals = { "table" } }
 
 ignore = {
 	"631", "61[124]",

worldeditadditions_core/register/check.lua

@@ -1,14 +1,37 @@
-function worldeditadditions_core.register_command(def)
+function worldeditadditions_core.register_command(name, def)
+	-- TODO: Implement our own deep copy function here
+	-- Depending on a Minetest-specific addition here makes be very uneasy
+	-- ...especially since it's not obvious at first glance that this isn't a
+	-- core feature provided by Lua itself
 	local def = table.copy(def)
-	assert(name and #name > 0)
-	assert(def.privs)
+	
+	assert(
+		def.privs,
+		"Error: No privileges specified in definition of command '"..name.."'."
+	)
+	
 	def.require_pos = def.require_pos or 0
+	
 	assert(def.require_pos >= 0 and def.require_pos < 3)
+	
 	if def.params == "" and not def.parse then
 		def.parse = function(params_text) return true end
 	else
-		assert(def.parse)
+		assert(
+			def.parse,
+			"Error: No parameter parsing function specified, even though parameters were specified in definition of command '"..name.."'."
+		)
 	end
-	assert(def.nodes_needed == nil or type(def.nodes_needed) == "function")
-	assert(def.func)
+	
+	assert(
+		def.nodes_needed == nil or type(def.nodes_needed) == "function",
+		"Error: nodes_needed must be either not specified or be a function that returns the number of nodes that could potentially be changed for a given set fo parsed parameters in definition of command '"..name.."'"
+	)
+	
+	assert(
+		def.func,
+		"Error: 'func' is not defined. It must be defined to the function to call to run the command in definition of command '"..name.."'."
+	)
+	
+	return def
 end

worldeditadditions_core/register/handler.lua

@@ -1,5 +1,5 @@
 function worldeditadditions_core.chatcommand_handler(cmd_name, name, param)
-	local def = assert(worldedit.registered_commands[cmd_name])
+	local def = assert(worldedit.registered_commands[cmd_name], "Error: Failed to locate worldedit command definition for command '"..name.."' (this is probably a bug).")
 
 	if def.require_pos == 2 then
 		local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]

worldeditadditions_core/register/override.lua

@@ -1,6 +1,6 @@
 local we_c = worldeditadditions_core
 function we_c.override_command(name, def)
-	local success, def = we_c.check(def)
+	local success, def = we_c.check(name, def)
 
 	if not success then
 		return false, def

worldeditadditions_core/register/register.lua

@@ -1,6 +1,6 @@
 local we_c = worldeditadditions_core
 function we_c.register_command(name, def)
-	local success, def = we_c.check(def)
+	local success, def = we_c.check(name, def)
 
 	if not success then
 		return false, def

worldeditadditions_core/worldedit/init.lua

@@ -1,4 +1,4 @@
---- WorldEdit dependencies for WorldEditAdditions
+--- WorldEdit shim just in case WorldEdit doesn't exist
 
 worldedit = {
 	registered_commands = {  }