Fix consume_wield on tools

It shouldn't consume the whole tool, but
should wear it.  Without having groups to
use, just wear the tool based on whichever
group is most "lenient" in terms of uses.

docs/issues-game.txt

@@ -32,6 +32,9 @@ ISSUES-GAME: Gameplay-affecting issues
 		- Maybe add a generic "# hints completed" qualifier?
 		- Maybe add a number of hours played (non-idle) qualifier?
 
+- Stylus is probably worth hiding too until player has
+  made pliant concrete.
+
 - All flora should be radiation-sensitive.
 	- Currently only flowers, add sedges and rushes
 	- Should be at risk of harm during growth or spreading

mods/nc_api/util_misc.lua

@@ -229,15 +229,28 @@ end
 
 function nodecore.consume_wield(player, qty)
 	local wielded = player:get_wielded_item()
-	if wielded then
+	if wielded and qty and qty > 0 then
 		local wdef = wielded:get_definition()
-		if wdef.stack_max > 1 and qty then
+		if wdef and wdef.stack_max > 1 then
 			local have = wielded:get_count() - qty
 			if have <= 0 then
 				wielded = ItemStack("")
 			else
 				wielded:set_count(have)
 			end
+		elseif wdef and wdef.type == "tool" then
+			local uses = 1
+			local caps = wielded:get_tool_capabilities()
+			for _, v in pairs(caps and caps.groupcaps or {}) do
+				if v.uses > uses then uses = v.uses end
+			end
+			local wear = wielded:get_wear()
+			wear = wear + (65535 / uses) * (1 + nodecore.boxmuller() * 0.05)
+			if wear > 65536 then
+				wielded = ItemStack("")
+			else
+				wielded:set_wear(wear)
+			end
 		end
 		return player:set_wielded_item(wielded)
 	end