fix a bunch of bugs with placement

src/api/java/baritone/api/pathing/movement/IMovement.java

@@ -45,10 +45,6 @@ public interface IMovement {
      */
     boolean safeToCancel();
 
-    double recalculateCost();
-
-    double calculateCostWithoutCaching();
-
     boolean calculatedWhileLoaded();
 
     BetterBlockPos getSrc();

src/main/java/baritone/behavior/MemoryBehavior.java

@@ -25,7 +25,6 @@ import baritone.api.event.events.TickEvent;
 import baritone.api.event.events.type.EventState;
 import baritone.cache.ContainerMemory;
 import baritone.cache.Waypoint;
-import baritone.pathing.movement.CalculationContext;
 import baritone.utils.BlockStateInterface;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockBed;
@@ -196,7 +195,7 @@ public final class MemoryBehavior extends Behavior {
     }
 
     private BlockPos neighboringConnectedBlock(BlockPos in) {
-        BlockStateInterface bsi = new CalculationContext(baritone).bsi;
+        BlockStateInterface bsi = baritone.bsi;
         Block block = bsi.get0(in).getBlock();
         if (block != Blocks.TRAPPED_CHEST && block != Blocks.CHEST) {
             return null; // other things that have contents, but can be placed adjacent without combining

src/main/java/baritone/behavior/PathingBehavior.java

@@ -361,6 +361,10 @@ public final class PathingBehavior extends Behavior implements IPathingBehavior,
         }
     }
 
+    public CalculationContext secretInternalGetCalculationContext() {
+        return context;
+    }
+
     /**
      * See issue #209
      *

src/main/java/baritone/pathing/movement/Movement.java

@@ -76,31 +76,28 @@ public abstract class Movement implements IMovement, MovementHelper {
         this(baritone, src, dest, toBreak, null);
     }
 
-    @Override
+    public double getCost() throws NullPointerException {
-    public double getCost() {
+        return cost;
+    }
+
+    public double getCost(CalculationContext context) {
         if (cost == null) {
-            cost = calculateCost(new CalculationContext(baritone));
+            cost = calculateCost(context);
         }
         return cost;
     }
 
     public abstract double calculateCost(CalculationContext context);
 
-    @Override
+    public double recalculateCost(CalculationContext context) {
-    public double recalculateCost() {
         cost = null;
-        return getCost();
+        return getCost(context);
     }
 
     public void override(double cost) {
         this.cost = cost;
     }
 
-    @Override
-    public double calculateCostWithoutCaching() {
-        return calculateCost(new CalculationContext(baritone));
-    }
-
     /**
      * Handles the execution of the latest Movement
      * State, and offers a Status to the calling class.

src/main/java/baritone/pathing/path/PathExecutor.java

@@ -232,14 +232,14 @@ public class PathExecutor implements IPathExecutor, Helper {
             // do this only once, when the movement starts, and deliberately get the cost as cached when this path was calculated, not the cost as it is right now
             currentMovementOriginalCostEstimate = movement.getCost();
             for (int i = 1; i < Baritone.settings().costVerificationLookahead.get() && pathPosition + i < path.length() - 1; i++) {
-                if (path.movements().get(pathPosition + i).calculateCostWithoutCaching() >= ActionCosts.COST_INF && canCancel) {
+                if (((Movement) path.movements().get(pathPosition + i)).calculateCost(behavior.secretInternalGetCalculationContext()) >= ActionCosts.COST_INF && canCancel) {
                     logDebug("Something has changed in the world and a future movement has become impossible. Cancelling.");
                     cancel();
                     return true;
                 }
             }
         }
-        double currentCost = movement.recalculateCost();
+        double currentCost = ((Movement) movement).recalculateCost(behavior.secretInternalGetCalculationContext());
         if (currentCost >= ActionCosts.COST_INF && canCancel) {
             logDebug("Something has changed in the world and this movement has become impossible. Cancelling.");
             cancel();

src/main/java/baritone/process/BuilderProcess.java

@@ -465,6 +465,9 @@ public class BuilderProcess extends BaritoneProcessHelper implements IBuilderPro
     }
 
     public Goal placementgoal(BlockPos pos, BuilderCalculationContext bcc) {
+        if (ctx.world().getBlockState(pos).getBlock() != Blocks.AIR) {
+            return new GoalPlace(pos);
+        }
         boolean allowSameLevel = ctx.world().getBlockState(pos.up()).getBlock() != Blocks.AIR;
         for (EnumFacing facing : Movement.HORIZONTALS_BUT_ALSO_DOWN____SO_EVERY_DIRECTION_EXCEPT_UP) {
             if (MovementHelper.canPlaceAgainst(ctx, pos.offset(facing)) && ctx.world().mayPlace(bcc.getSchematic(pos.getX(), pos.getY(), pos.getZ()).getBlock(), pos, false, facing, null)) {

src/main/java/baritone/utils/ExampleBaritoneControl.java

@@ -558,7 +558,7 @@ public class ExampleBaritoneControl extends Behavior implements Helper {
             while (moves.contains(null)) {
                 moves.remove(null);
             }
-            moves.sort(Comparator.comparingDouble(Movement::getCost));
+            moves.sort(Comparator.comparingDouble(move -> move.getCost(new CalculationContext(baritone))));
             for (Movement move : moves) {
                 String[] parts = move.getClass().toString().split("\\.");
                 double cost = move.getCost();