improve wieldview API (!)

to support transform registration without groups
this will make detaching screwdriver from mcl more easy

mods/ITEMS/screwdriver/init.lua

@@ -1,5 +1,7 @@
 local S = minetest.get_translator("screwdriver")
 
+local has_wieldview = minetest.get_modpath("wieldview")
+
 screwdriver = {}
 
 screwdriver.ROTATE_FACE = 1
@@ -176,7 +178,7 @@ minetest.register_tool("screwdriver:screwdriver", {
 	description = S("Screwdriver"),
 	inventory_image = "screwdriver.png",
 	wield_image = "screwdriver.png^[transformFX",
-	groups = { tool = 1, not_in_creative_inventory = 1 },
+	groups = { tool = 1 }, --not in creative inventory?
 	on_use = function(itemstack, user, pointed_thing)
 		screwdriver.handler(itemstack, user, pointed_thing, screwdriver.ROTATE_FACE, 200)
 		return itemstack
@@ -197,7 +199,9 @@ minetest.register_craft({
 	}
 })
 
-minetest.register_alias("screwdriver:screwdriver1", "screwdriver:screwdriver")
-minetest.register_alias("screwdriver:screwdriver2", "screwdriver:screwdriver")
-minetest.register_alias("screwdriver:screwdriver3", "screwdriver:screwdriver")
-minetest.register_alias("screwdriver:screwdriver4", "screwdriver:screwdriver")
+for i = 1, 4 do
+	minetest.register_alias("screwdriver:screwdriver"..tostring(i), "screwdriver:screwdriver")
+	if has_wieldview then
+		wieldview.register_transform("screwdriver:screwdriver"..tostring(i), "R90")
+	end
+end

mods/ITEMS/screwdriver/mod.conf

@@ -1,2 +1,3 @@
 name = screwdriver
-depends = mcl_wip
+depends = mcl_wip
+optional_depends = wieldview

mods/PLAYER/wieldview/transform.lua

@@ -1,10 +1,8 @@
 -- Wielded Item Transformations - http://dev.minetest.net/texture
 
-wieldview.transform = {
-	["screwdriver:screwdriver"]="R90",
-	["screwdriver:screwdriver1"]="R90",
-	["screwdriver:screwdriver2"]="R90",
-	["screwdriver:screwdriver3"]="R90",
-	["screwdriver:screwdriver4"]="R90",
-}
+wieldview.register_transform = function(item, rotation)
+	wieldview.transform[item] = rotation
+end
+
+wieldview.transform = {}