commit 8d9991fb2ed9be8d4868998f9763735387a3e4bc
Author: Paul Liverman III <paul.liverman.iii@gmail.com>
Date:   Thu Mar 7 13:29:13 2019 -0800

    init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d907c43
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.lua
diff --git a/images b/images
new file mode 100644
index 0000000..40a8f8a
--- /dev/null
+++ b/images
@@ -0,0 +1,23 @@
+     abstract-029 -> fuel cell!
+USED abstract-045 -> filterpump?
+     abstract-050 -> vent (for filters/pumps)!
+     abstract-072 -> thruster!
+     airtight-hatch -> closed airlock!
+     airtight-hatch-1 -> open airlock!
+     ammo-box -> ammo?
+USED chemical-tank -> tanks!
+     circuitry -> computer
+     convergence-target -> ?
+     cryo-chamber -> clone bay!
+     energy-tank -> ?
+     expanded-rays -> antimatter reactor!
+     hospital-cross -> medical cabinet?
+     metal-scales -> ?
+     paper-tray -> ?
+USED person -> you!
+USED plain-square -> flooring / internal space!
+     power-generator -> fabricator!
+     targeted -> ?
+     tinker -> repair needed icon ?
+     triangle-target -> ?
+     wooden-crate -> cargo space? (or actual cargo?)
diff --git a/life-support b/life-support
new file mode 100644
index 0000000..998f65f
--- /dev/null
+++ b/life-support
@@ -0,0 +1,60 @@
+21% normal
+5% consumption
+volume of breath? 6 litres
+16 breaths per minute
+our units are approximately 1/5 a litre
+
+6 * 1/5 * 16 / 60 * 0.05 = oxygen per second rate = 0.016
+
+co2
+> 0.0008 is unhealthy
+> 0.005 is very unhealthy
+> 0.05 is dangerous to animal life (becomes uncomfortable as well)
+> 0.084 for 60 minutes = death
+> 0.1 is immediately dangerous
+
+o2 below 19.5% is considered dangerous
+0.47 pressure at 21% is lowest pressure
+- 5 to 8 psi for 100% is tolerable (1 psi = 0.068046 atm)
+  (should be roughly 0.12 atm (minimum at 100%))
+2.5 atm at 21% should be a safe maximum, short periods in excess of 70 atm are tolerable
+
+Min Pressure: 0.12 atm with pure oxygen
+Max Pressure with pure oxygen: 0.5 atm
+Min Pressure w 19.5-21%: 0.47 atm
+Max Pressure with 19.5-21%: 2.5 atm
+- draw a box, current point has to be in the box? NO
+if oxygen < 0.195 -> dying
+if pressure < 0.12 -> dying
+if pressure < 0.47
+  if oxygen < -2.3(pressure) + 1.276 -> dying
+if pressure > 0.5
+  if oxygen > -.054(pressure) + 0.33 -> oxy toxicity
+if pressure > 2.5 -> oxy toxicity
+
+min pressures: 0.12 and 0.47
+max pressures: 0.5  and 2.5
+min percents:  1    and 1
+max percents
+
+
+feces
+  3-8oz per day -> * 0.0295735 / 5 = volume units
+  = 0.03253085 / 24 / 60 / 60 = 3.7651446759259e-07 per second
+  75% water, 25% solid (below list)
+0.3 -> bacteria
+0.3 -> cellulose (can be burned -> co2 h2o)
+0.1-0.2 -> fats
+0.1-0.2 -> phosphates (iron/calcium)
+0.02-0.03 -> proteins
+
+(one urination ~ 0.35 / 5 volume)
+ per day => 0.8 to 2 litres
+ per second = 3.2407407407407e-06
+urine
+~0.04 urea (ammonia/co2)
+~0.01 salt, potassium
+0.95 water
+
+0.4 litres of water expelled in breath per day
+per second: 0.4 / 5 / 24 / 60 / 60 = 9.2592592592593e-07
diff --git a/notes b/notes
new file mode 100644
index 0000000..3e90157
--- /dev/null
+++ b/notes
@@ -0,0 +1,34 @@
+Survival in ship, console / UI is only interface, must repair broken systems.
+Walk around to repair various panels.
+Randomly generated ship layout?
+
+What systems are needed? Toilet, bed, medical cabinet, thrusters, warp drive,
+ reactor, battery, fuel / fluid storage, airlock, computer, sensors, weapons?,
+ cargo area, grappling hook / docking system, piping and wiring of course,
+ filters, pumps, atmospheric sensors, lights, toolbox, locker
+
+How about a starbase instead? Starting with just a small number of components,
+and events come to you.
+- Could still implement travel, just through warp drive only. You have station-
+  keeping thrusters to maintain, but no main engines.
+- If you lose thrusters, your orbit starts slowly decaying (you can still just
+  warp to a higher orbit of course)
+- Start to fall into atmosphere? Can scoop from upper atmospheres, but starts to
+  decay faster.
+- Send out mining drones.
+- 3D Printing tech? For manufacture? fluid plastic
+
+Each tile needs to reference a Fluid (atmosphere). Volumes of atmosphere Fluids
+are equal to 10 per tile. Volumes of single tanks are 8 per.
+Doubles: 4   Triples: 3
+
+Start:
+- basic life support: bed, toilet, kitchen, atmospheric sensor, filter, pump,
+  tankage (o2, co2, n2)
+  (maybe I should use the scuba tanks icon for multiple tanks in one spot?)
+- one thruster, uses n2
+- battery, solar panels? (start in orbit close enough to a star?)
+- warp drive, barely capable of warping your station
+- docking arm / airlock (airlock at end of pylon)
+- computer, basic sensors?, filters/pumps?, lights?
+- locker w toolbox (locker is our cargo space to start)
diff --git a/src/Breach.moon b/src/Breach.moon
new file mode 100644
index 0000000..6738564
--- /dev/null
+++ b/src/Breach.moon
@@ -0,0 +1,24 @@
+class Breach
+  new: (@high, @low, @volume=1) =>
+  update: (dt) =>
+    a, b = @high\pressure!, @low\pressure!
+    if b > a
+      tmp = @high
+      @high = @low
+      @low = tmp
+      tmp = a
+      a = b
+      b = tmp
+    elseif a > b
+      @active = true
+    else
+      @active = false
+
+    -- print "High: #{a}", "Low: #{b}", "Active? #{@active}"
+    if @active
+      sum = (a - b) * @volume * dt
+      for type in pairs @high.contents
+        tmp = sum * @high\percent type
+        -- print "Moving #{tmp} #{type}.."
+        @high\remove type, tmp
+        @low\add type, tmp
diff --git a/src/Filter.moon b/src/Filter.moon
new file mode 100644
index 0000000..37c964d
--- /dev/null
+++ b/src/Filter.moon
@@ -0,0 +1,22 @@
+class Filter
+  new: (@high, @low, @allows={}, @volume=1) =>
+  update: (dt) =>
+    a, b = @high\pressure!, @low\pressure!
+    if b > a
+      tmp = @high
+      @high = @low
+      @low = tmp
+      tmp = a
+      a = b
+      b = tmp
+    elseif a > b
+      @active = true
+    else
+      @active = false
+
+    if @active
+      sum = (a - b) * @volume * dt
+      for type in pairs @allows
+        tmp = sum * @high\percent type
+        @high\remove type, tmp
+        @low\add type, tmp
diff --git a/src/FilterPump.moon b/src/FilterPump.moon
new file mode 100644
index 0000000..cfd7ca7
--- /dev/null
+++ b/src/FilterPump.moon
@@ -0,0 +1,15 @@
+import abs, min from math
+
+class FilterPump
+  new: (@source, @destination, @allows={}, @volume=1, @rate=0) =>
+  reverse: =>
+    tmp = @source
+    @source = @destination
+    @destination = tmp
+  update: (dt) =>
+    if @rate > 0
+      sum = abs(@source\pressure! - @destination\pressure!) * @rate * @volume * dt
+      for type, amount in pairs @allows
+        tmp = sum * @source\percent type
+        @source\remove type, tmp
+        @destination\add type, tmp
diff --git a/src/Fluid.moon b/src/Fluid.moon
new file mode 100644
index 0000000..e8a0c1d
--- /dev/null
+++ b/src/Fluid.moon
@@ -0,0 +1,19 @@
+class Fluid
+  new: (@volume=1) =>
+    @contents = {}
+    @sum = 0
+  add: (type, amount) =>
+    @contents[type] = 0 unless @contents[type]
+    @contents[type] += amount
+    @sum += amount
+  remove: (type, amount) =>
+    @contents[type] = 0 unless @contents[type]
+    @contents[type] -= amount
+    @sum -= amount
+  pressure: =>
+    return @sum / @volume
+  percent: (type) =>
+    return 0 unless @contents[type]
+    return @contents[type] / @sum
+  amount: =>
+    return @contents[type] or 0
diff --git a/src/Player.moon b/src/Player.moon
new file mode 100644
index 0000000..ea7cb05
--- /dev/null
+++ b/src/Player.moon
@@ -0,0 +1,101 @@
+import max, min from math
+
+o2_consumption = 0.016
+h2o_production = 9.2592592592593e-07
+co2_production = 0.016
+feces_production = 3.7651446759259e-07 -- want at 0.032, involuntary at 0.06
+urine_production = 3.2407407407407e-06 -- want to urinate at 0.09, involuntary at 0.11
+
+class Player
+  new: (@structure, @x=0, @y=0) =>
+    @state = {
+      "oxygen starvation": 0
+      "oxygen toxicity": 0
+      "nitrogen narcosis": 0
+      "helium narcosis": 0
+      "carbon dioxide poisoning": 0
+    }
+    @feces = 0
+    @urine = 0
+    @actionTimer = 0
+    if row = @structure[@x]
+      if tile = row[@y]
+        @atmosphere = tile.atmosphere
+
+  update: (dt, input) =>
+    if not @atmosphere
+      @state["oxygen starvation"] += dt
+    else
+      pressure = @atmosphere\pressure!
+      o2 = @atmosphere\percent "O2"
+      if o2 < 0.195
+        @state["oxygen starvation"] += dt
+      else
+        @state["oxygen starvation"] = max 0, @state["oxygen starvation"] - dt / 2
+      @state["oxygen starvation"] += dt if pressure < 0.12
+      @state["oxygen starvation"] += dt if pressure < 0.47 and o2 < -2.3 * pressure + 1.276
+      if pressure > 2.5 or (pressure > 0.5 and o2 > -0.054 * pressure + 0.33)
+        @state["oxygen toxicity"] += dt
+        if o2 > 0.195
+          @state["oxygen starvation"] = max 0, @state["oxygen starvation"] - dt * 3
+      else
+        @state["oxygen toxicity"] = max 0, @state["oxygen toxicity"] - dt * 2
+
+      if pressure > 50
+        n2 = @atmosphere\percent "N2"
+        he = @atmosphere\percent "He"
+        @state["nitrogen narcosis"] += dt if n2 > 0.5
+        @state["helium narcosis"] += dt if pressure > 500 and he > 0.5 and n2 < 0.25
+      else
+        @state["nitrogen narcosis"] = max 0, @state["nitrogen narcosis"] - dt * 4
+        @state["helium narcosis"] = max 0, @state["helium narcosis"] - dt * 8
+
+      co2 = @atmosphere\percent "CO2"
+      if co2 > 0.005
+        @state["carbon dioxide poisoning"] += dt * (220 * co2 - 0.1)
+      elseif co2 < 0.005
+        @state["carbon dioxide poisoning"] = max 0, @state["carbon dioxide poisoning"] - dt
+
+      -- using min garuntees we will not cause a negative oxygen
+      -- it is assumed co2/h20 output will be stable until death when there is
+      --  not enough oxygen
+      @atmosphere\remove "O2", min o2, o2_consumption * dt
+      @atmosphere\add "CO2", co2_production * dt
+      @atmosphere\add "H2O", h2o_production * dt
+
+    if @state["oxygen starvation"] >= 2.5 * 60 or
+      @state["oxygen toxicity"] >= 60 * 60 or
+      @state["carbon dioxide poisoning"] >= 60 * 60
+        print "Dead."
+
+    @actionTimer -= dt
+    if @actionTimer <= 0
+      x, y = input\get "move"
+      if x != 0 or y != 0
+        if x < 0
+          x = -1
+        elseif x > 0
+          x = 1
+        if y < 0
+          y = -1
+        elseif y > 0
+          y = 1
+        if @getTile! -- if inside
+          if tile = @getTile x, y
+            if tile.obj
+              nil -- TODO access the object (or go through airlock)
+            else
+              @actionTimer = 1/6
+              @x += x
+              @y += y
+              @atmosphere = tile.atmosphere -- assumes atmosphere might be different, but that only happens when passing through an airlock
+        else -- outside
+          if tile = @getTile x, y
+            if tile.obj
+              nil -- TODO access (or go through airlock)
+            else
+              nil -- TODO move
+
+  getTile: (x=0, y=0) =>
+    if row = @structure[@x + x]
+      return row[@y + y]
diff --git a/src/Pump.moon b/src/Pump.moon
new file mode 100644
index 0000000..2dc998f
--- /dev/null
+++ b/src/Pump.moon
@@ -0,0 +1,15 @@
+import abs, min from math
+
+class Pump
+  new: (@source, @destination, @volume=1, @rate=0) =>
+  reverse: =>
+    tmp = @source
+    @source = @destination
+    @destination = tmp
+  update: (dt) =>
+    if @rate > 0
+      sum = abs(@source\pressure! - @destination\pressure!) * @rate * @volume * dt
+      for type, amount in pairs @source.contents
+        tmp = sum * @source\percent type
+        @source\remove type, tmp
+        @destination\add type, tmp
diff --git a/src/Structure.moon b/src/Structure.moon
new file mode 100644
index 0000000..8d84209
--- /dev/null
+++ b/src/Structure.moon
@@ -0,0 +1,66 @@
+import graphics from love
+
+width, height = graphics.getDimensions!
+x_center, y_center = width / 2, height / 2
+x_offset, y_offset = math.floor(width / 4), math.floor(height / 4)
+
+images = require "images"
+colors = require "colors"
+Fluid = require "Fluid"
+fluids = require "fluids"
+
+class Structure
+  new: (tiles_or_size=2) =>
+    @systems = {}
+    if "table" == type tiles_or_size
+      for x, row in pairs tiles_or_size
+        @[x] = {}
+        for y, tile in pairs row
+          @[x][y] = tile
+          if tile.systems
+            for system in *tile.systems
+              table.insert @systems, tile.systems
+    else
+      volume = 10 * (2 * tiles_or_size + 1) ^ 2
+      air = Fluid(volume)
+      for type, percent in pairs fluids.air
+        air\add type, volume * percent
+      for x = -tiles_or_size, tiles_or_size
+        @[x] = {}
+        for y = -tiles_or_size, tiles_or_size
+          @[x][y] = { img: "plain-square.png", color: colors.floor, atmosphere: air }
+
+    -- temporary
+    system = require("FilterPump")(@[0][0].atmosphere, Fluid(math.huge), { CO2: true }, 8, 1)
+    @[0][1] = {
+      img: "plain-square.png"
+      obj: "abstract-045.png", color: colors.dark
+      systems: { system }
+      atmosphere: @[0][0].atmosphere
+    }
+    @systems[1] = system
+    tank = Fluid(8)
+    tank\add "O2", 100
+    tanksys = require("Pump")(tank, @[0][0].atmosphere, 1, 0.0015)
+    @[1][0] = {
+      img: "plain-square.png"
+      obj: "chemical-tank.png", color: colors.blue
+      systems: { tanksys }
+      atmosphere: @[0][0].atmosphere
+    }
+    @systems[2] = tanksys
+
+  update: (dt) =>
+    for system in *@systems
+      system\update dt
+
+  draw: (location) =>
+    for x = location.x - x_offset, location.y + x_offset
+      if row = @[x]
+        for y = location.y - y_offset, location.y + y_offset
+          if tile = row[y]
+            graphics.setColor colors.floor
+            graphics.draw images[tile.img], (x - location.x) * 32 + x_center, (y - location.y) * 32 + y_center, 0, 1/16, 1/16, 256, 256
+            if tile.obj
+              graphics.setColor tile.color or 1, 1, 1, 1
+              graphics.draw images[tile.obj], (x - location.x) * 32 + x_center, (y - location.y) * 32 + y_center, 0, 1/16 * 0.9, 1/16 * 0.9, 256, 256
diff --git a/src/Valve.moon b/src/Valve.moon
new file mode 100644
index 0000000..75666c8
--- /dev/null
+++ b/src/Valve.moon
@@ -0,0 +1,24 @@
+import min from math
+
+class Valve
+  new: (@high, @low, @volume=1, @rate=0) =>
+  update: (dt) =>
+    a, b = @high\pressure!, @low\pressure!
+    if b > a
+      tmp = @high
+      @high = @low
+      @low = tmp
+      tmp = a
+      a = b
+      b = tmp
+    elseif a > b
+      @active = true
+    else
+      @active = false
+
+    if @active
+      sum = (a - b) * min(@rate, @volume) * dt
+      for type in pairs @high.contents
+        tmp = sum * @high\percent type
+        @high\remove type, tmp
+        @low\add type, tmp
diff --git a/src/colors.moon b/src/colors.moon
new file mode 100644
index 0000000..4af54a0
--- /dev/null
+++ b/src/colors.moon
@@ -0,0 +1,7 @@
+{
+  default: { 1, 1, 1, 1 }
+  floor: { 2/3, 2/3, 2/3, 1 }
+  dark: { 1/3, 1/3, 1/3, 1 }
+  blue: { 0, 0, 1/3, 1 }
+  player: { 0, 0, 1, 1 }
+}
diff --git a/src/ecs.moon b/src/ecs.moon
new file mode 100644
index 0000000..b9a0f22
--- /dev/null
+++ b/src/ecs.moon
@@ -0,0 +1,3 @@
+Systems: Valve, Pump, Filter, Player
+Components: volume, area, controls, sum, floor, rate, filter
+Entities: tile, player
diff --git a/src/fluids.moon b/src/fluids.moon
new file mode 100644
index 0000000..83ff475
--- /dev/null
+++ b/src/fluids.moon
@@ -0,0 +1,18 @@
+{
+  earth: { A: 0.0069, H2O: 0.0039, CO2: 0.0004, Ne: 0.000015, N2: 0.779885, O2: 0.2089 }
+  air: { N2: 0.78, O2: 0.22 }
+  feces: {
+    H2O: 0.75, organics: 0.25 * 0.335, C6H10O5: 0.25 * 0.335
+    phosphates: 0.25 * 0.152, fats: 0.25 * 0.152, proteins: 0.25 * 0.026
+  }
+  urine: { H2O: 0.95, urea: 0.04, salts: 0.01 } -- sodium/potassium salts
+  organics: {
+    C: 0.504, O2: 0.202, N2: 0.141, H2: 0.081, P: 0.03, S: 0.01, K: 0.01, Mg: 0.005
+    Ca: 0.005, Fe: 0.002, Mn: 0.001, Co: 0.001, Zn: 0.001, Cu: 0.001, Mo: 0.001
+  }
+  -- phosphates: { iron: 0.33, calcium: 0.33, phosphor: 0.34 }
+  -- FePO4 & Ca3(PO4)2
+}
+
+-- C6 H10 O5 + 6x 02 -> 6x C 02 + 5x H2 0
+-- 6 oxygen + 1 cellulose -> 6 carbon dioxide + 5 water
diff --git a/src/images.moon b/src/images.moon
new file mode 100644
index 0000000..420e1f3
--- /dev/null
+++ b/src/images.moon
@@ -0,0 +1,4 @@
+images = {}
+for img in *love.filesystem.getDirectoryItems "img"
+  images[img] = love.graphics.newImage "img/#{img}"
+images
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diff --git a/src/img/wooden-crate.png b/src/img/wooden-crate.png
new file mode 100644
index 0000000..ee4c68e
Binary files /dev/null and b/src/img/wooden-crate.png differ
diff --git a/src/main.moon b/src/main.moon
new file mode 100644
index 0000000..2af3c44
--- /dev/null
+++ b/src/main.moon
@@ -0,0 +1,87 @@
+lurker = require "lurker"
+lurker.quiet = true
+debug = true
+
+baton = require "baton"
+input = baton.new {
+  controls:
+    left: { 'key:left', 'key:a', 'axis:leftx-', 'button:dpleft' }
+    right: { 'key:right', 'key:d', 'axis:leftx+', 'button:dpright' }
+    up: { 'key:up', 'key:w', 'axis:lefty-', 'button:dpup' }
+    down: { 'key:down', 'key:s', 'axis:lefty+', 'button:dpdown' }
+    -- action: { 'key:x', 'button:a' }
+    exit: { 'key:escape' }
+  pairs:
+    move: { 'left', 'right', 'up', 'down' }
+  joystick: love.joystick.getJoysticks![1]
+}
+
+images = require "images"
+colors = require "colors"
+
+-- floor = { img: "plain-square.png", color: colors.floor }
+
+Structure = require "Structure"
+structure = Structure(3)
+Player = require "Player"
+player = Player(structure)
+
+love.update = (dt) ->
+  -- dt *= 100
+  require("lovebird").update!
+  lurker.update!
+
+  input\update!
+  love.event.quit! if input\pressed "exit"
+
+  player\update(dt, input)
+  structure\update dt
+
+  if debug
+    if row = structure[player.x]
+      if tile = row[player.y]
+        atmosphere = tile.atmosphere
+        if love.keyboard.isDown("c")
+          atmosphere\add "CO2", 1
+        if love.keyboard.isDown("n")
+          atmosphere\add "N2", 10
+        if love.keyboard.isDown("o")
+          atmosphere\add "O2", 1
+        if love.keyboard.isDown("h")
+          atmosphere\add "He", 10
+
+  -- structure[player.x] = {} unless structure[player.x]
+  -- structure[player.x][player.y] = { img: "plain-square.png", color: colors.floor } unless structure[player.x][player.y]
+
+width, height = love.graphics.getDimensions!
+love.draw = ->
+  if debug
+    -- love.graphics.setColor 1, 1, 1, 1/4
+    -- love.graphics.line width / 2, 0, width / 2 , height
+    -- love.graphics.line 0, height / 2, width, height / 2
+    love.graphics.setColor 1, 1/3, 1/3, 1
+    love.graphics.line -player.x * 32 + width / 2, 0, -player.x * 32 + width / 2, height
+    love.graphics.line 0, -player.y * 32 + height / 2, width, -player.y * 32 + height / 2
+
+  structure\draw player
+
+  love.graphics.setColor colors.player
+  love.graphics.draw images["person.png"], width / 2, height / 2, 0, 1/16 * 0.9, 1/16 * 0.9, 256, 256
+
+  if debug
+    if row = structure[player.x]
+      if tile = row[player.y]
+        if atmosphere = tile.atmosphere
+          love.graphics.setColor 1, 1, 1, 1
+          love.graphics.print "Pressure: #{math.floor(10 * atmosphere\pressure!) / 10} atm (#{math.floor(10 * atmosphere.sum) / 10})", 0, 0
+          i = 1
+          for type, amount in pairs atmosphere.contents
+            love.graphics.print "#{type}: #{math.floor(1000 * atmosphere\percent type) / 10}% (#{math.floor(100 * amount) / 100})", 0, i * 15
+            i += 1
+
+    i = 0
+    love.graphics.setColor 1, 1, 1, 1
+    for state, value in pairs player.state
+      if value > 0
+        love.graphics.print "Warning: #{state} (#{math.floor value})", width / 2, i * 15
+        i += 1
diff --git a/src/station.moon b/src/station.moon
new file mode 100644
index 0000000..b3833c8
--- /dev/null
+++ b/src/station.moon
@@ -0,0 +1,246 @@
+station = {
+  player: { x: 0, y: 2 }
+  {
+    x: -2, y: -2
+    "airlock"
+    -- connections: { "atmosphere", "vacuum" }
+  }
+  {
+    x: -1, y: -2
+    "tank"
+    connections: { "fabricator" }
+  }
+  {
+    x: 0, y: -2
+    "fabricator"
+  }
+  {
+    x: 1, y: -2
+    "tank"
+  }
+  {
+    x: 2, y: -2
+    "thruster"
+  }
+  {
+    x: -1, y: 0
+    "warp drive"
+  }
+  {
+    x: 0, y: 0
+    "battery"
+  }
+  {
+    x: 1, y: 0
+    "computer"
+  }
+  {
+    x: -1, y: 1
+    "tank", "H2", 12.5
+  }
+  {
+    x: 0, y: 1
+    "fuel cell", "H2O", 0.1
+  }
+  {
+    x: 1, y: 1
+    "tank", "O2", 12.5
+  }
+  {
+    x: 2, y: 0
+    "locker"
+  }
+  {
+    x: 2, y: 1
+    "bed"
+  }
+  {
+    x: -2, y: 3
+    "thruster"
+  }
+  {
+    x: 0, y: 3
+    "toilet"
+  }
+  {
+    x: 1, y: 3
+    "tank", "organic waste", 0.01
+  }
+  {
+    x: 2, y: 3
+    "water reclamation unit"
+  }
+  {
+    x: -3, y: 0
+    "tank", "H20", 0.1
+  }
+  {
+    x: -3, y: 1
+    "tank", "H20", 0.1
+  }
+  {
+    x: 3, y: 0
+    "tank", "N2", 12
+  }
+  {
+    x: 3, y: 1
+    "tank", "N2", 12
+  }
+  {
+    x: 0, y: -5
+    "solar panel"
+  }
+  {
+    x: 0, y: -4
+    "solar panel"
+  }
+  {
+    x: 0, y: -3
+    "solar panel"
+  }
+  {
+    x: 0, y: 4
+    "solar panel"
+  }
+  {
+    x: 0, y: 5
+    "solar panel"
+  }
+  {
+    x: 0, y: 6
+    "solar panel"
+  }
+  -- systems: {
+  --   { "airlock", "atmosphere" }
+  --   { "tank:H2", "fuel cell" }
+  --   { "tank:O2", "fuel cell" }
+  --   { "thruster", "tank:N2" }
+  -- }
+}
+
+
+
+
+Fluid = require "Fluid"
+fluids = require "fluids"
+
+vaccum = Fluid(math.huge)
+station = {
+  atmosphere: Fluid() -- volume is corrected by Structure()
+  systems: {
+    -- "exterior hatch": Valve()
+    "airlock": Fluid(10)\fill fluids.air -- TODO write it, needs to return self
+    "oxygen tank": Fluid(8)\fill "O2", 12.5
+    "hydrogen tank": Fluid(8)\fill "H2", 12.5
+    "water tank": Fluid(12)\fill "H2O", 1/2
+    "water tank 2": Fluid(12)\fill "H2O", 1/2
+    "nitrogen tank": Fluid(12)\fill "N2", 10
+    "nitrogen tank 2": Fluid(12)\fill "N2", 10
+    "waste tank": Fluid(8)\fill "organic waste", 0.01
+    "fuel cell": Fluid(5)\fill "H2O", 0.1
+    -- "thruster": Thruster("nitrogen tank")
+    Valve("nitrogen tank", "nitrogen tank 2")
+  }
+}
+
+
+
+
+
+
+-- 12.5 atm pressure in oxy tanks
+
+fluids = require "fluids"
+
+station = {
+  atmosphere: Fluid() -- volume to be reassigned later
+}
+
+vaccum_source = Fluid(math.huge)
+n2_source = Fluid(12)\fill "N2", 12.5 -- TODO make fill function!
+
+station[3] = {
+  [0]: {
+    img: "chemical-tank.png"
+    systems: { n2_source }
+  }
+  [1]: ->
+    tank = Fluid(12)\fill "N2", 12.5
+    return {
+      img: "chemical-tank.png"
+      systems: { tank, Valve(tank, n2_source, 1, 1) }
+    }
+}
+
+station[-2] = {
+  [-2]: ->
+    airlock = Fluid(10)\fill fluids.air -- TODO make fill function, make it return self
+    exterior = Valve(airlock, vaccum_source, 7.5, 0)\set "name", "exterior hatch" -- TODO make set function
+    interior = Valve(airlock, station.atmosphere, 8, 0)\set "name", "interior hatch"
+    return {
+      img: "airtight-hatch.png"
+      systems: { airlock, exterior, interior }
+    }
+  [3]: ->
+    thruster = Thruster()
+    return {
+      img: "abstract-072.png"
+      systems: { thruster, Valve(n2_source, thruster, 1, 0)\set "name", "thruster" }
+    }
+}
+
+
+
+
+
+Volume(8)\add "O2", 100
+
+
+
+station = {}
+for x = -2, 2
+  station[x] = {}
+  for y = -2, 3
+    station[x][y] = {
+      hull: true -- show floor
+    }
+
+airlock = station[-2][-2]
+fab_tank = station[-1][-2]
+fab = station[0][-2]
+fab_tank2 = station[1][-2]
+thruster = station[2][-2]
+
+-- idea, create objects with x/y values, insert them later
+
+airlock = {
+  hatch: true
+}
+
+import insert from table
+import Volume from require "fluids"
+
+Tank = (t) ->
+  if fucked
+    nil
+
+o2 = {internal}
+
+internal = 8
+external = 12
+full = 100
+half = 50
+
+o2 = Tank internal, full
+
+-- systems = {
+--   O2: Volume(8)\add "O2", 100
+--   H2: Volume(8)\add "H2", 100
+--   N2: Volume(12)\add "N2", 150
+--   -- N2_2: Volume(12)\add "N2", 150
+--   H2O: Volume(12)\add "H2O", 50
+--   -- H2O_2: Volume(12)\add "H2O", 50
+-- }
+
+systems = {}
+insert Volume(8)\add "O2", 100
diff --git a/systems b/systems
new file mode 100644
index 0000000..092dab3
--- /dev/null
+++ b/systems
@@ -0,0 +1,12 @@
+Systems
+- Movement, done.
+- Fluid physics, done.
+- Fluid handling.
+  - Filters to allow transferring only one type of fluid at a time, done.
+  - Pumps to allow transferring from low pressure to high pressure, done.
+- Needs (sleep, food, air, water, waste disposal).
+  - Sleep timer refreshed by skipping some time. Events can interrupt sleep.
+    Will pass out and not be awoken for a while if you let it get too low.
+  - Food & Water. (Consumable items.)
+  - Air. Regularly removing oxygen and adding co2 and h20.
+  - Waste. Liquid (urea(co2&ammonia)&h2o) and Solid ('organic waste'?)
diff --git a/tmp/Fluid.moon b/tmp/Fluid.moon
new file mode 100644
index 0000000..ce86e6b
--- /dev/null
+++ b/tmp/Fluid.moon
@@ -0,0 +1,24 @@
+-- what kind of usage do I want?
+
+tank = Container(volume):add("O2", 400)
+o2_control = Valve(tank, atmosphere, 0) -- rate/area/whatever
+-- remember, Containers don't need to be updated, everything else does
+
+fluid = require "fluid"
+ls_tank = fluid.Container(volume):add("O2")
+fluid.Mix(ls_tank, fluid.vaccum, 0.001)
+
+
+
+
+
+
+
+a = Container(volume):add('co2', 300):add('o2', 100)
+Mix(a, Container.vaccum, 0.01) -- rate/volume/area specified (your choice of meaning lol)
+Pump(a, b, 1) --rate/volume/area, your choice
+Filter(a, b, 0.1) -- rate/volume/area, whatever
+
+Mix(a, b, rate, filter)
+-- with optional filter / rate (if rate is zero, disabled, if rate is anything
+--  else, affects pressure dynamic (like, does it work against pressure?))