Assorted changes to tube breaking/repair behavior

* Tubes can now be intentionally broken using a hammer
* Log messages have been improved slightly for tube repair
* Punching a broken tube now causes damage due to the sharp edges

item_transport.lua

@@ -55,15 +55,22 @@ end)
 -- tube overload mechanism:
 -- when the tube's item count (tracked in the above tube_item_count table)
 -- exceeds the limit configured per tube, replace it with a broken one.
+
+function pipeworks.break_tube(pos)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	meta:set_string("the_tube_was", minetest.serialize(node))
+	minetest.swap_node(pos, {name = "pipeworks:broken_tube_1"})
+	pipeworks.scan_for_tube_objects(pos)
+end
+
 local crunch_tube = function(pos, cnode, cmeta)
 	if enable_max_limit then
 		local h = minetest.hash_node_position(pos)
 		local itemcount = tube_item_count[h] or 0
 		if itemcount > max_tube_limit then
-			cmeta:set_string("the_tube_was", minetest.serialize(cnode))
 			pipeworks.logger("Warning - a tube at "..minetest.pos_to_string(pos).." broke due to too many items ("..itemcount..")")
-			minetest.swap_node(pos, {name = "pipeworks:broken_tube_1"})
-			pipeworks.scan_for_tube_objects(pos)
+			pipeworks.break_tube(pos)
 		end
 	end
 end

routing_tubes.lua

@@ -10,6 +10,36 @@ minetest.register_craft( {
 	},
 })
 
+-- The hammers that can be used to break/repair tubes
+local allowed_hammers = {
+	"anvil:hammer",
+	"cottages:hammer",
+	"glooptest:hammer_steel",
+	"glooptest:hammer_bronze",
+	"glooptest:hammer_diamond",
+	"glooptest:hammer_mese",
+	"glooptest:hammer_alatro",
+	"glooptest:hammer_arol"
+}
+
+-- Convert the above list to a format that's easier to look up
+for _,hammer in ipairs(allowed_hammers) do
+	allowed_hammers[hammer] = true
+end
+
+-- Check if the player is holding a suitable hammer or not - if they are, apply wear to it
+function pipeworks.check_and_wear_hammer(player)
+	local itemstack = player:get_wielded_item()
+	local wieldname = itemstack:get_name()
+	local playername = player:get_player_name()
+	if allowed_hammers[wieldname] then
+		itemstack:add_wear(1000)
+		player:set_wielded_item(itemstack)
+		return true
+	end
+	return false
+end
+
 local nodecolor = 0xffff3030
 
 pipeworks.register_tube("pipeworks:broken_tube", {
@@ -36,29 +66,27 @@ pipeworks.register_tube("pipeworks:broken_tube", {
 			local wieldname = itemstack:get_name()
 			local playername = puncher:get_player_name()
 			local log_msg = playername.." struck a broken tube at "..minetest.pos_to_string(pos).."\n"
-			if   wieldname == "anvil:hammer"
-			  or wieldname == "cottages:hammer"
-			  or wieldname == "glooptest:hammer_steel"
-			  or wieldname == "glooptest:hammer_bronze"
-			  or wieldname == "glooptest:hammer_diamond"
-			  or wieldname == "glooptest:hammer_mese"
-			  or wieldname == "glooptest:hammer_alatro"
-			  or wieldname == "glooptest:hammer_arol" then
-				local meta = minetest.get_meta(pos)
-				local was_node = minetest.deserialize(meta:get_string("the_tube_was"))
-				if was_node and was_node ~= "" then
-					pipeworks.logger(log_msg.."            with "..wieldname.." to repair it.")
-					minetest.swap_node(pos, { name = was_node.name, param2 = was_node.param2 })
-					pipeworks.scan_for_tube_objects(pos)
-					itemstack:add_wear(1000)
-					puncher:set_wielded_item(itemstack)
-					return itemstack
-				else
-					pipeworks.logger(log_msg.."            but it can't be repaired.")
-				end
-			else
-				pipeworks.logger(log_msg.."            with "..wieldname.." but that tool is too weak.")
+			local meta = minetest.get_meta(pos)
+			local was_node = minetest.deserialize(meta:get_string("the_tube_was"))
+			if not was_node then
+				pipeworks.logger(log_msg.."            but it can't be repaired.")
+				return
 			end
+			if not pipeworks.check_and_wear_hammer(puncher) then
+				if wieldname == "" then
+					pipeworks.logger(log_msg.."            by hand. It's not very effective.")
+					if minetest.settings:get_bool("enable_damage") then
+						minetest.chat_send_player(playername,S("Broken tubes may be a bit sharp. Perhaps try with a hammer?"))
+						puncher:set_hp(puncher:get_hp()-1)
+					end
+				else
+					pipeworks.logger(log_msg.."            with "..wieldname.." but that tool is too weak.")
+				end
+				return
+			end
+			pipeworks.logger(log_msg.."            with "..wieldname.." to repair it.")
+			minetest.swap_node(pos, { name = was_node.name, param2 = was_node.param2 })
+			pipeworks.scan_for_tube_objects(pos)
 		end
 	}
 })

tube_registration.lua

@@ -113,6 +113,18 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 			connect_sides = {front = 1, back = 1, left = 1, right = 1, top = 1, bottom = 1},
 			priority = 50
 		},
+		on_punch = function(pos, node, player, pointed)
+			local playername = player:get_player_name()
+			if minetest.is_protected(pos, playername) and not minetest.check_player_privs(playername, {protection_bypass=true}) then
+				return minetest.node_punch(pos, node, player, pointed)
+			end
+			if pipeworks.check_and_wear_hammer(player) then
+				local wieldname = player:get_wielded_item():get_name()
+				pipeworks.logger(string.format("%s struck a tube at %s with %s to break it.", playername, minetest.pos_to_string(pos), wieldname))
+				pipeworks.break_tube(pos)
+			end
+			return minetest.node_punch(pos, node, player, pointed)
+		end,
 		after_place_node = pipeworks.after_place,
 		after_dig_node = pipeworks.after_dig,
 		on_rotate = false,