Miner v1

Mines N rows of given length and always comes back the exact amount it
mined so if there is a problem it doesn't mess it up

mine.lua

@@ -1,15 +1,59 @@
 local robot = require("robot")
 
-local arg = ...
+local function mine_single()
+  robot.swing()
 
-local function mine(count)
-  for i = 1, count do
-    robot.swing()
-    robot.up()
-    robot.swing()
-    robot.down()
-    robot.forward()
+  local result, error = robot.forward()
+  if not result then
+    print("Cannot mine: " .. error)
+    return false
+  end
+
+  robot.swingUp()
+
+  return true
+end
+
+local function mine_n(count)
+  local mined = 0
+  for _ = 1, count do
+    if mine_single() then
+      mined = mined + 1
+    else
+      break
+    end
+  end
+  return mined
+end
+
+local function mine_row(length)
+  local mined = mine_n(length)
+
+  robot.turnAround()
+
+  for _ = 1, mined do
+    while not robot.forward() do end
   end
 end
 
-mine(arg)
+local function mine(mine_rows, mine_row_length)
+
+  for i = 1, mine_rows do
+    print("Mining row " .. i .. " of " .. mine_rows)
+    mine_row(mine_row_length)
+    robot.turnLeft()
+    if mine_n(3) ~= 3 then
+      print("Unable to continue mining rows")
+      return
+    end
+    robot.turnLeft()
+  end
+
+end
+
+
+local rows, row_length = ...
+
+print("Will mine " .. rows .. "x" .. row_length .. " rows")
+
+mine(rows, row_length)