core: add register_alias command

it is backwards-compatible with worldedit.register_command

worldeditadditions_commands/aliases.lua

@@ -1,14 +1,16 @@
-worldedit.alias_command("smoothadv", "convolve")
-worldedit.alias_command("conv", "convolve")
+local wea_c = worldeditadditions_core
 
-worldedit.alias_command("naturalise", "layers")
-worldedit.alias_command("naturalize", "layers")
+wea_c.register_alias("smoothadv", "convolve")
+wea_c.register_alias("conv", "convolve")
 
-worldedit.alias_command("flora", "bonemeal")
+wea_c.register_alias("naturalise", "layers")
+wea_c.register_alias("naturalize", "layers")
+
+wea_c.register_alias("flora", "bonemeal")
 
 -- Measure Tools
-worldedit.alias_command("mcount", "count")
-worldedit.alias_command("mfacing", "mface")
+wea_c.register_alias("mcount", "count")
+wea_c.register_alias("mfacing", "mface")
 
 
 --- Overrides to core WorldEdit commands

worldeditadditions_core/core/register_alias.lua

@@ -0,0 +1,40 @@
+
+local wea_c = worldeditadditions_core
+
+local function register_alias(cmdname_target, cmdname_source, override)
+	if override == nil then override = false end
+	
+	local def_source = wea_c.fetch_command_def(cmdname_source)
+	
+	if not def_source then
+		minetest.log("error", "worldeditadditions_core: Failed to register alias for "..cmdname_source.." → "..cmdname_target..", as the source command doesn't exist.")
+		return false
+	end
+	
+	if wea_c.fetch_command_def(cmdname_target) and not override then
+		minetest.log("error", "worldeditadditions_core: Failed to register alias for "..cmdname_source.." → "..cmdname_target..", as the target command exists and override wasn't set to true.")
+		return false
+	end
+	
+	print("DEBUG ALIAS source "..cmdname_source.." target "..cmdname_target)
+	
+	if minetest.chatcommands["/"..cmdname_target] then
+		minetest.override_chatcommand(
+			"/"..cmdname_target,
+			minetest.chatcommands["/"..cmdname_source]
+		)
+	else
+		minetest.register_chatcommand(
+			"/"..cmdname_target,
+			minetest.chatcommands["/"..cmdname_source]
+		)
+	end
+	wea_c.registered_commands[cmdname_target] = wea_c.registered_commands[cmdname_source]
+	
+	if minetest.global_exists("worldedit") then
+		worldedit.registered_commands[cmdname_target] = worldedit.registered_commands[cmdname_source]
+	end
+end
+
+
+return register_alias

worldeditadditions_core/init.lua

@@ -25,6 +25,7 @@ worldeditadditions_core = {
 local wea_c = worldeditadditions_core
 wea_c.register_command = dofile(modpath.."/core/register_command.lua")
 wea_c.fetch_command_def = dofile(modpath.."/core/fetch_command_def.lua")
+wea_c.register_alias = dofile(modpath.."/core/register_alias.lua")
 
 
 -- Initialise WorldEdit stuff if the WorldEdit mod is not present