First version of code: actually thirst

init.lua

@@ -0,0 +1,77 @@
+--[[
+
+Thirsty mod [thirsty]
+==========================
+
+A mod that adds a "thirst" mechanic, similar to hunger.
+
+Copyright (C) 2015 Ben Deutsch <ben@bendeutsch.de>
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+USA
+
+]]
+
+-- Configuration variables
+local tick_time = 0.5
+local thirst_per_second = 1.0 / 20.0
+
+local drink_from_node = {
+    -- value: thirst regen per second
+    ['default:water_source'] = 0.5,
+    ['default:water_flowing'] = 0.5,
+}
+
+local time_next_tick = tick_time
+
+local thirst_level = {}
+
+hb.register_hudbar('thirst', 0xffffff, "Thirst", {
+    bar = 'thirsty_hudbars_bar.png',
+    icon = 'thirsty_cup_100_16.png'
+}, 20, 20, false)
+
+minetest.register_on_joinplayer(function(player)
+   hb.init_hudbar(player, 'thirst', 20, 20, false) 
+   local name = player:get_player_name()
+   thirst_level[name] = 20
+end)
+
+minetest.register_globalstep(function(dtime)
+    -- get thirsty
+    time_next_tick = time_next_tick - dtime
+    while time_next_tick < 0.0 do
+        -- time for thirst
+        time_next_tick = time_next_tick + tick_time
+        for _,player in ipairs(minetest.get_connected_players()) do
+            local name = player:get_player_name()
+            local pos  = player:getpos()
+            pos.y = math.floor(pos.y) + 0.5
+            local node = minetest.get_node(pos)
+            local drink_per_second = drink_from_node[node.name]
+            if drink_per_second ~= nil and drink_per_second > 0 then
+                thirst_level[name] = thirst_level[name] + drink_per_second * tick_time
+                --print("Raising thirst by "..(drink_per_second*tick_time).." to "..thirst_level[name])
+                -- Drinking from the ground won't give you more than max
+                if thirst_level[name] > 20 then thirst_level[name] = 20 end
+            else
+                thirst_level[name] = thirst_level[name] - thirst_per_second * tick_time
+                --print("Lowering thirst by "..(thirst_per_second*tick_time).." to "..thirst_level[name])
+                if thirst_level[name] < 0 then thirst_level[name] = 0 end
+            end
+            hb.change_hudbar(player, 'thirst', math.ceil(thirst_level[name]), 20)
+        end
+    end
+end)