Adding fuel usage

Adding fuel usage for digging and building. Fuel storage hopper module
added to hold fuel.

1 files changed, 18 insertions, 2 deletions

diff --git a/init.lua b/init.lua
index f30643f..58b6a19 100644
--- a/init.lua
+++ b/init.lua
@@ -8,15 +8,31 @@ dofile( minetest.get_modpath( "digtron" ) .. "/node_controllers.lua" ) -- contro
 
 dofile( minetest.get_modpath( "digtron" ) .."/recipes.lua" )
 
-digtron.refractory = 1.0 -- How long a digtron waits between cycles.
+digtron.cycle_time = 1.0 -- How long a digtron waits between cycles.
 digtron.traction_factor = 3.0 -- How many digtron nodes can be moved for each adjacent solid node that the digtron has traction against
 
+-- fuel costs. For comparison, in the default game:
+-- one default tree block is 30 units
+-- one coal lump is 40 units
+-- one coal block is 370 units (apparently it's slightly more productive making your coal lumps into blocks before burning)
+-- one book is 3 units
+
+local dig_cost_adjustment_factor = 0.5 -- across-the-board multiplier to make overall fuel costs easier to modify
+
+digtron.dig_cost_default = 1.0 * dig_cost_adjustment_factor -- how much fuel is required to dig a node if not in one of the following groups.
+-- If a node is in more than one of the following groups, the group with the maximum cost for that node is used.
+digtron.dig_cost_cracky = 2.0 * dig_cost_adjustment_factor -- eg, stone
+digtron.dig_cost_crumbly = 1.0 * dig_cost_adjustment_factor -- eg, dirt, sand
+digtron.dig_cost_choppy = 1.5 * dig_cost_adjustment_factor -- eg, wood
+
+digtron.build_cost = 1.0 -- how much fuel is required to build a node
+
 -- digtron group numbers:
 -- 1 - generic digtron node, nothing special is done with these. They're just dragged along.
 -- 2 - inventory-holding digtron, has a "main" inventory that the digtron can add to and take from.
 -- 3 - digger head, has an "execute_dig" method in its definition
 -- 4 - builder head, has a "test_build" and "execute_build" method in its definition
-
+-- 5 - fuel-holding digtron, has a "main" invetory that the control node can draw fuel items from. Separate from general inventory, nothing gets put here automatically.
 
 minetest.register_lbm({
 	name = "digtron:sand_digger_upgrade",