Add day time and brightness display

Closes #3.

This also reorganizes the GUI control script to split it into more
modular pieces, each of which is only concerned with one piece of
functionality.

evoGUI.lua

@@ -1,28 +1,72 @@
 require "defines"
 
 if not evogui then evogui = {} end
-evogui.previous = -1
+evogui.update_delay = 60 -- ticks to wait between each GUI update
+evogui.previous = nil -- game tick when we did our last GUI update
 
 local function update_gui()
-    local run_time_seconds = math.floor(game.tick/60)
-    local run_time_minutes = math.floor(run_time_seconds/60)
-    local run_time_hours = math.floor(run_time_minutes/60)
-
-    if evogui.previous ~= run_time_seconds then
+    if evogui.previous == nil or (game.tick - evogui.previous) >= evogui.update_delay then
         for i, player in ipairs(game.players) do
-            if player.gui.top.evoGUI == nil then
-                player.gui.top.add{type="frame", name="evoGUI", direction = "vertical"}
-                player.gui.top.evoGUI.add{type="label", name="evolution_factor"}
-                player.gui.top.evoGUI.add{type="label", name="run_time"}
+            evogui.create_or_update(player)
+
+            if player.gui.top.evoGUI then
+                evogui.update_evolution(player.gui.top.evoGUI)
+                evogui.update_run_time(player.gui.top.evoGUI)
+                evogui.update_day_time(player.gui.top.evoGUI)
             end
-            player.gui.top.evoGUI.evolution_factor.caption = string.format("Biter evolution: %0.1f%%", game.evolution_factor * 100)
-            player.gui.top.evoGUI.run_time.caption = string.format("Play time: %d:%02d:%02d",
-                                                                   run_time_hours,
-                                                                   run_time_minutes % 60,
-                                                                   run_time_seconds % 60)
         end
-        evogui.previous = run_time_seconds
+        evogui.previous = game.tick
     end
 end
-
 evogui.update_gui = update_gui
+
+local function create_or_update(player)
+    if not player.gui.top.evoGUI  then
+        player.gui.top.add{type="frame", name="evoGUI", direction = "vertical"}
+        player.gui.top.evoGUI.add{type="label", name="day_time"}
+        player.gui.top.evoGUI.add{type="label", name="evolution_factor"}
+        player.gui.top.evoGUI.add{type="label", name="run_time"}
+    end
+
+    if not player.gui.top.evoGUI.day_time or
+        not player.gui.top.evoGUI.evolution_factor or
+        not player.gui.top.evoGUI.run_time then
+        player.gui.top.evoGUI.destroy()
+    end
+end
+evogui.create_or_update = create_or_update
+
+local function update_evolution(evoGUI)
+    evoGUI.evolution_factor.caption = string.format("Biter evolution: %0.1f%%", game.evolution_factor * 100)
+end
+evogui.update_evolution = update_evolution
+
+local function update_run_time(evoGUI)
+    local run_time_seconds = math.floor(game.tick/60)
+    local run_time_minutes = math.floor(run_time_seconds/60)
+    local run_time_hours = math.floor(run_time_minutes/60)
+
+    evoGUI.run_time.caption = string.format("Play time: %d:%02d:%02d",
+                                            run_time_hours,
+                                            run_time_minutes % 60,
+                                            run_time_seconds % 60)
+end
+evogui.update_run_time = update_run_time
+
+local function update_day_time(evoGUI)
+    -- 0.5 is midnight; let's make days *start* at midnight instead.
+    local day_time = math.fmod(game.daytime + 0.5, 1)
+
+    local day_time_minutes = math.floor(day_time * 24 * 60)
+    local day_time_hours = math.floor(day_time_minutes / 60)
+
+    local rounded_minutes = day_time_minutes - (day_time_minutes % 15)
+
+    local brightness = math.floor((1 - game.darkness) * 100)
+
+    evoGUI.day_time.caption = string.format("The time is: %d:%02d. Brightness: %d%%",
+                                            day_time_hours,
+                                            rounded_minutes % 60,
+                                            brightness)
+end
+evogui.update_day_time = update_day_time

info.json

@@ -1,10 +1,10 @@
 {
   "name": "EvoGUI",
-  "version": "0.1.1",
+  "version": "0.2.0",
   "title": "Evolution Factor Indicator",
   "author": "Octav \"narc\" Sandulescu",
   "contact": "[email protected]",
-  "homepage": "None right now",
+  "homepage": "https://github.com/narc0tiq/evoGUI/",
   "description": "Places an indicator on your UI telling you the current biter evolution factor (as a percentage). It also tells you how long you've been playing.",
   "dependencies": ["base >= 0.12.0"]
 }