Allow mining (gravel) when returning

miner.lua

@@ -32,7 +32,7 @@ local function mine_row(length)
 
     robot.turnAround()
 
-    nav.forward(mined)
+    nav.forward(mined, true)
 end
 
 -- starts facing right, mines rows to the right
@@ -53,7 +53,7 @@ local function mine(mine_rows, mine_row_length)
 
     -- go back to start
     robot.turnAround()
-    nav.forward(moved_rows)
+    nav.forward(moved_rows, true)
 end
 
 return {

navigator.lua

@@ -2,14 +2,18 @@ local robot = require("robot")
 
 -- Moves forward n blocks.
 -- Waits if there is an obstruction
-local function forward(n)
+local function forward(n, mine)
     for _ = 1, n do
         while true do
             local result, error = robot.forward()
             if result then
                 break
             else
-                print("Cannot move: " .. error)
+                if mine and error == "solid" then
+                    robot.swing()
+                else
+                    print("Cannot move: " .. error)
+                end
             end
         end
     end