add basic support for real arrow key thingos

src/lua/core/computer.lua

@@ -97,10 +97,27 @@ local asciitr = {
   [127] = 8,
 }
 
+local escmap = {
+  A = 200, -- up
+  B = 208, -- down
+  C = 205, -- right
+  D = 203, -- left
+}
+
+local inesc = 0
 function computer.signalTransformers.key_down(s, a, ascii, key, user)
   if key ~= -1 then
     return s, a, ascii, key, user
   end
+  if ascii == 27 then
+    inesc = true
+  elseif inesc then
+    if ascii < 48 and ascii > 57 and ascii ~= 59 then
+      inesc = false
+      key = escmap[ascii] or 0
+      ascii = 0
+    end
+  end
   return s, a, math.floor(asciitr[ascii] or ascii), keymap[ascii] or key, user
 end