tried to fix detection of latest version of technic mod.

limited the number of recipes affected by it - now only the tubes' recipes
are disabled when technic is present.  All pipes, pipe devices, and tube
devices are available at all times.

updated the plastic sheet crafting chain to match current homedecor

crafts.lua

@@ -1,32 +1,4 @@
--- Crafting recipes for pipeworks
-
--- If the technic mod is present, then don't bother registering these recipes
--- as that mod supplies its own.
-
-if io.open(minetest.get_modpath("pipeworks").."/../technic/init.lua", "r") == nil then
-
-	-- If homedecor is not installed, we need to register a few of its crafts
-	-- manually so we can use them.
-
-	if minetest.get_modpath("homedecor") == nil then
-
-		minetest.register_craftitem(":homedecor:plastic_sheeting", {
-			description = "Plastic sheet",
-			inventory_image = "pipeworks_plastic_sheeting.png",
-		})
-
-		minetest.register_craft({
-		        type = "cooking",
-		        output = "homedecor:plastic_sheeting",
-		        recipe = "default:junglegrass",
-		})
-
-		minetest.register_craft({
-		        type = 'fuel',
-		        recipe = 'homedecor:plastic_sheeting',
-		        burntime = 30,
-		})
-	end
+-- Crafting recipes for pipes
 
 minetest.register_craft( {
         output = "pipeworks:pipe_110000_empty 12",
@@ -37,6 +9,25 @@ if io.open(minetest.get_modpath("pipeworks").."/../technic/init.lua", "r") == ni
         },
 })
 
+minetest.register_craft( {
+        output = "pipeworks:spigot 3",
+        recipe = {
+                { "pipeworks:pipe_110000_empty", "" },
+                { "", "pipeworks:pipe_110000_empty" },
+        },
+})
+
+minetest.register_craft( {
+	output = "pipeworks:entry_panel 2",
+	recipe = {
+		{ "", "default:steel_ingot", "" },
+	        { "", "pipeworks:pipe_110000_empty", "" },
+		{ "", "default:steel_ingot", "" },
+	},
+})
+
+-- Various ancillary pipe devices
+
 minetest.register_craft( {
         output = "pipeworks:pump_off 2",
         recipe = {
@@ -73,14 +64,95 @@ if io.open(minetest.get_modpath("pipeworks").."/../technic/init.lua", "r") == ni
         },
 })
 
+
+-- Various ancillary tube devices
+
 minetest.register_craft( {
-	        output = "pipeworks:spigot 3",
+	output = "pipeworks:filter 2",
 	recipe = {
-	                { "pipeworks:pipe_110000_empty", "" },
-	                { "", "pipeworks:pipe_110000_empty" },
+	        { "default:steel_ingot", "default:steel_ingot", "homedecor:plastic_sheeting" },
+	        { "default:stick", "default:mese_crystal", "homedecor:plastic_sheeting" },
+	        { "default:steel_ingot", "default:steel_ingot", "homedecor:plastic_sheeting" }
 	},
 })
 
+
+-- The tubes themselves
+
+
+-- If homedecor is not installed, we need to register its crafting chain for
+-- plastic sheeting so that pipeworks remains compatible with it.
+
+if minetest.get_modpath("homedecor") == nil then
+
+	minetest.register_craftitem(":homedecor:plastic_sheeting", {
+		description = "Plastic sheet",
+		inventory_image = "homedecor_plastic_sheeting.png",
+	})
+
+	minetest.register_craftitem(":homedecor:plastic_base", {
+		description = "Unprocessed Plastic base",
+		wield_image = "homedecor_plastic_base.png",
+		inventory_image = "homedecor_plastic_base_inv.png",
+	})
+
+	minetest.register_craft({
+		type = "shapeless",
+		output = 'homedecor:plastic_base 6',
+		recipe = { "default:junglegrass",
+			   "default:junglegrass",
+			   "default:junglegrass"
+		}
+	})
+
+	minetest.register_craft({
+		type = "shapeless",
+		output = 'homedecor:plastic_base 3',
+		recipe = { "default:dry_shrub",
+			   "default:dry_shrub",
+			   "default:dry_shrub"
+		},
+	})
+
+	minetest.register_craft({
+		type = "shapeless",
+		output = 'homedecor:plastic_base 4',
+		recipe = { "default:leaves",
+			   "default:leaves",
+			   "default:leaves",
+			   "default:leaves",
+			   "default:leaves",
+			   "default:leaves"
+		}
+	})
+
+	minetest.register_craft({
+		type = "cooking",
+		output = "homedecor:plastic_sheeting",
+		recipe = "homedecor:plastic_base",
+	})
+
+	minetest.register_craft({
+		type = 'fuel',
+		recipe = 'homedecor:plastic_base',
+		burntime = 30,
+	})
+
+	minetest.register_craft({
+		type = 'fuel',
+		recipe = 'homedecor:plastic_sheeting',
+		burntime = 30,
+	})
+
+end
+
+
+-- If the technic mod is present, then don't bother registering the recipes
+-- for the various tubes, as technic has its own recipes for those.
+
+if io.open(minetest.get_modpath("pipeworks").."/../technic/init.lua", "r") == nil and
+   io.open(minetest.get_modpath("pipeworks").."/../technic_master/technic/init.lua", "r") == nil then
+
 	minetest.register_craft( {
 		output = "pipeworks:tube 12",
 		recipe = {
@@ -146,23 +218,6 @@ if io.open(minetest.get_modpath("pipeworks").."/../technic/init.lua", "r") == ni
 		        { "homedecor:plastic_sheeting", "homedecor:plastic_sheeting", "homedecor:plastic_sheeting" }
 		},
 	})
-
-	minetest.register_craft( {
-		output = "pipeworks:filter 2",
-		recipe = {
-		        { "default:steel_ingot", "default:steel_ingot", "homedecor:plastic_sheeting" },
-		        { "default:stick", "default:mese_crystal", "homedecor:plastic_sheeting" },
-		        { "default:steel_ingot", "default:steel_ingot", "homedecor:plastic_sheeting" }
-		},
-	})
-
-	minetest.register_craft( {
-        output = "pipeworks:entry_panel 2",
-        recipe = {
-		{ "", "default:steel_ingot", "" },
-                { "", "pipeworks:pipe_110000_empty", "" },
-		{ "", "default:steel_ingot", "" },
-        },
-	})
-
 end
+
+