core: implement fetch_command_def

This rovides an abstraction to fetch a worldedit command's definition, 
regardless of where it was registered.

We would normally expect all commands to be registered in 
wea_c.registered_commands, but before we only do a one-off pass to 
import commands from worldedit should a new mod we aren't aware of 
register a command with worldedit and get loaded after us, we won't 
detect it - hencee  the need for this function.

worldeditadditions/mod.conf

@@ -1,4 +1,4 @@
 name = worldeditadditions
 description = Extra tools and commands to extend WorldEdit for Minetest
 depends = worldedit
-optional_depends = bonemeal, cool_trees, default, moretrees, ethereal
+optional_depends = worldeditadditions_core, bonemeal, cool_trees, default, moretrees, ethereal

worldeditadditions_commands/commands/meta/airapply.lua

@@ -3,7 +3,7 @@
 -- ███████ ██ ██████  ███████ ██████  ██████  ██     ████
 -- ██   ██ ██ ██   ██ ██   ██ ██      ██      ██      ██
 -- ██   ██ ██ ██   ██ ██   ██ ██      ██      ███████ ██
-
+local wea_c  = worldeditadditions_core
 
 worldedit.register_command("airapply", {
 	params = "<command_name> <args>",
@@ -20,7 +20,7 @@ worldedit.register_command("airapply", {
 		end
 		
 		-- Note that we search the worldedit commands here, not the minetest ones
-		local cmd_we = worldedit.registered_commands[cmd_name]
+		local cmd_we = wea_c.fetch_command_def(cmd_name)
 		if cmd_we == nil then
 			return false, "Error: "..cmd_name.." isn't a valid command."
 		end

worldeditadditions_commands/commands/meta/ellipsoidapply.lua

@@ -3,6 +3,7 @@
 -- █████   ██      ██      ██ ██████  ███████ █████   ███████ ██████  ██████  ██     ████
 -- ██      ██      ██      ██ ██           ██ ██      ██   ██ ██      ██      ██      ██
 -- ███████ ███████ ███████ ██ ██      ███████ ███████ ██   ██ ██      ██      ███████ ██
+local wea_c = worldeditadditions_core
 
 worldedit.register_command("ellipsoidapply", {
 	params = "<command_name> <args>",
@@ -21,7 +22,7 @@ worldedit.register_command("ellipsoidapply", {
 		-- print("cmd_name", cmd_name, "args_text", args_text)
 		
 		-- Note that we search the worldedit commands here, not the minetest ones
-		local cmd_we = worldedit.registered_commands[cmd_name]
+		local cmd_we = wea_c.fetch_command_def(cmd_name)
 		if cmd_we == nil then
 			return false, "Error: "..cmd_name.." isn't a valid command."
 		end

worldeditadditions_commands/commands/meta/noiseapply2d.lua

@@ -3,6 +3,7 @@
 -- ██ ██  ██ ██    ██ ██ ███████ █████   ███████ ██████  ██████  ██     ████    █████  ██   ██
 -- ██  ██ ██ ██    ██ ██      ██ ██      ██   ██ ██      ██      ██      ██    ██      ██   ██
 -- ██   ████  ██████  ██ ███████ ███████ ██   ██ ██      ██      ███████ ██    ███████ ██████
+local wea_c = worldeditadditions_core
 
 
 worldedit.register_command("noiseapply2d", {
@@ -19,7 +20,7 @@ worldedit.register_command("noiseapply2d", {
 		end
 		
 		-- Note that we search the worldedit commands here, not the minetest ones
-		local cmd_we = worldedit.registered_commands[cmd_name]
+		local cmd_we = wea_c.fetch_command_def(cmd_name)
 		if cmd_we == nil then
 			return false, "Error: "..cmd_name.." isn't a valid command."
 		end

worldeditadditions_commands/commands/meta/subdivide.lua

@@ -1,11 +1,12 @@
 local wea = worldeditadditions
+local wea_c = worldeditadditions_core
 
 -- Test command:
 --	//multi //fp set1 1330 60 5455 //fp set2 1355 35 5430 //subdivide 10 10 10 fixlight //y
 
 local function will_trigger_saferegion(name, cmd_name, args)
-	if not worldedit.registered_commands[cmd_name] then return nil, "Error: That worldedit command could not be found (perhaps it hasn't been upgraded to worldedit.register_command() yet?)" end
-	local def = worldedit.registered_commands[cmd_name]
+	local def = wea_c.fetch_command_def(cmd_name)
+	if not def then return nil, "Error: That worldedit command could not be found (perhaps it hasn't been upgraded to worldedit.register_command() yet?)" end
 	if not def.parse then return nil, "Error: No parse method found (this is a bug)." end
 	
 	local parsed = {def.parse(args)}
@@ -57,7 +58,7 @@ worldedit.register_command("subdivide", {
 		
 		local cmd_name = parts[4]
 		
-		if not worldedit.registered_commands[cmd_name] then
+		if not wea_c.fetch_command_def(cmd_name) then
 			return false, "Error: The worldedit command '"..parts[4].."' does not exist (try /help)."
 		end
 		
@@ -73,7 +74,7 @@ worldedit.register_command("subdivide", {
 		local pos1, pos2 = worldedit.sort_pos(worldedit.pos1[name], worldedit.pos2[name])
 		local volume = worldedit.volume(pos1, pos2)
 		
-		local cmd = worldedit.registered_commands[cmd_name]
+		local cmd = wea_c.fetch_command_def(cmd_name)
 		-- Note that we don't need to check for //multi privileges, as it does it at runtime
 		if not minetest.check_player_privs(name, cmd.privs) then
 			return false, "Error: Your privileges are unsufficient to run '"..cmd_name.."'."

worldeditadditions_commands/doc/init.lua

@@ -11,7 +11,7 @@
 -- The strategy here is not to have duplicate content, but to pull data from 
 -- existing sources.
 -- Long-form article descriptions: Chat-Command-Reference.md
--- Short descriptions: Undecided, but maybe worldedit.registered_commands
+-- Short descriptions: Undecided, but maybe from the registered command definition?
 
 worldeditadditions.doc = {}
 

worldeditadditions_commands/mod.conf

@@ -1,4 +1,4 @@
 name = worldeditadditions_commands
 description = worldeditadditions: chat command interfaces
-depends = worldeditadditions, worldedit_commands, worldedit_shortcommands, worldedit
+depends = worldeditadditions, worldeditadditions_core, worldedit_commands, worldedit_shortcommands, worldedit
 optional_depends = worldeditdebug, bonemeal

worldeditadditions_core/core/fetch_command_def.lua

@@ -0,0 +1,20 @@
+
+
+--- Fetches the definition of a WorldEditAdditions or WorldEdit command
+-- Does not support fetching generic Minetest commands - check
+-- minetest.chatcommands for this.
+-- @param	cmdname		string		The name of the command to fetch the definition for.
+local function fetch_command_def(cmdname)
+	local wea_c = worldeditadditions_core
+	
+	if wea_c.registered_commands[cmdname] then
+		return wea_c.registered_commands[cmdname]
+	end
+	if minetest.global_exists("worldedit") and worldedit.registered_commands and worldedit.registered_commands[cmdname] then
+		return worldedit.registered_commands[cmdname]
+	end
+	
+	return nil
+end
+
+return fetch_command_def

worldeditadditions_core/core/register_command.lua

@@ -5,15 +5,14 @@
 -- ██   ██ ███████  ██████  ██ ███████    ██    ███████ ██   ██
 
 -- WorldEditAdditions chat command registration
-local modpath = minetest.get_modpath("worldeditadditions_core")
-local run_command = dofile(modpath.."/core/run_command.lua")
+local wea_c = worldeditadditions_core
+local run_command = dofile(wea_c.modpath.."/core/run_command.lua")
 
 local function log_error(cmdname, error_message)
 	minetest.log("error", "register_command("..cmdname..") error: "..error_message)
 end
 
 local function register_command(cmdname, options)
-	local we_c = worldeditadditions_core
 	
 	---
 	-- 1: Validation

worldeditadditions_core/core/run_command.lua

@@ -1,7 +1,7 @@
 -- WARNING: safe_region MUST NOT be imported more than once, as it defines chat commands. If you want to import it again elsewhere, check first that multiple dofile() calls don't execute a file more than once.
-local modpath = minetest.get_modpath("worldeditadditions_core")
-local safe_region = dofile(modpath.."/core/safe_region.lua")
-local human_size = dofile(modpath.."/core/lib/human_size.lua")
+local wea_c = worldeditadditions_core
+local safe_region = dofile(wea_c.modpath.."/core/safe_region.lua")
+local human_size = dofile(wea_c.modpath.."/core/lib/human_size.lua")
 
 -- TODO: Reimplement worldedit.player_notify(player_name, msg_text)
 
@@ -14,7 +14,6 @@ local function run_command_stage2(player_name, func, parse_result)
 end
 
 local function run_command(cmdname, options, player_name, paramtext)
-	local we_c = worldeditadditions_core
 	if options.require_pos > 0 and not worldedit.pos1[player_name] then
 		worldedit.player_notify(player_name, "Error: pos1 must be selected to use this command.")
 		return false
@@ -34,9 +33,9 @@ local function run_command(cmdname, options, player_name, paramtext)
 	if options.nodes_needed then
 		local potential_changes = options.nodes_needed(player_name, unpack(parse_result))
 		
-		local limit = we_c.safe_region_limit_default
-		if we_c.safe_region_limits[player_name] then
-			limit = we_c.safe_region_limits[player_name]
+		local limit = wea_c.safe_region_limit_default
+		if wea_c.safe_region_limits[player_name] then
+			limit = wea_c.safe_region_limits[player_name]
 		end
 		
 		if potential_changes > limit then

worldeditadditions_core/init.lua

@@ -20,15 +20,16 @@ worldeditadditions_core = {
 	safe_region_limits = {},
 	-- The default limit for new players on the number of potential nodes changed before safe_region kicks in.
 	safe_region_limit_default = 100000,
-	register_command = dofile(modpath.."/core/register_command.lua")
 }
 
+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")
 
-local we_c = worldeditadditions_core
 
 -- Initialise WorldEdit stuff if the WorldEdit mod is not present
 if minetest.global_exists("worldedit") then
-	dofile(we_c.modpath.."/core/integrations/worldedit.lua")
+	dofile(wea_c.modpath.."/core/integrations/worldedit.lua")
 else
-	dofile(we_c.modpath.."/core/integrations/noworldedit.lua")
+	dofile(wea_c.modpath.."/core/integrations/noworldedit.lua")
 end