Made /up and /ceil benefit from fly mode.

This avoids littering the world with floating glass blocks when possible.

src/main/java/com/sk89q/worldedit/LocalPlayer.java

@@ -236,6 +236,17 @@ public abstract class LocalPlayer {
      * @return whether the player was moved
      */
     public boolean ascendToCeiling(int clearance) {
+        return ascendToCeiling(clearance, true);
+    }
+
+    /**
+     * Ascend to the ceiling above.
+     *
+     * @param clearance How many blocks to leave above the player's head
+     * @param alwaysGlass Always put glass under the player
+     * @return whether the player was moved
+     */
+    public boolean ascendToCeiling(int clearance, boolean alwaysGlass) {
         Vector pos = getBlockIn();
         int x = pos.getBlockX();
         int initialY = Math.max(0, pos.getBlockY());
@@ -252,7 +263,7 @@ public abstract class LocalPlayer {
             // Found a ceiling!
             if (!BlockType.canPassThrough(world.getBlock(new Vector(x, y, z)))) {
                 int platformY = Math.max(initialY, y - 3 - clearance);
-                floatAt(x, platformY + 1, z);
+                floatAt(x, platformY + 1, z, alwaysGlass);
                 return true;
             }
 
@@ -269,6 +280,17 @@ public abstract class LocalPlayer {
      * @return whether the player was moved
      */
     public boolean ascendUpwards(int distance) {
+        return ascendUpwards(distance, true);
+    }
+
+    /**
+     * Just go up.
+     *
+     * @param distance How far up to teleport
+     * @param alwaysGlass Always put glass under the player
+     * @return whether the player was moved
+     */
+    public boolean ascendUpwards(int distance, boolean alwaysGlass) {
         final Vector pos = getBlockIn();
         final int x = pos.getBlockX();
         final int initialY = Math.max(0, pos.getBlockY());
@@ -283,7 +305,7 @@ public abstract class LocalPlayer {
             } else if (y > maxY + 1) {
                 break;
             } else if (y == maxY + 1) {
-                floatAt(x, y - 1, z);
+                floatAt(x, y - 1, z, alwaysGlass);
                 return true;
             }
 
@@ -300,7 +322,7 @@ public abstract class LocalPlayer {
      * @param y The Y coordinate of the block to float in
      * @param z The Z coordinate of the block to float in
      */
-    private void floatAt(int x, int y, int z) {
+    public void floatAt(int x, int y, int z, boolean alwaysGlass) {
         getPosition().getWorld().setBlockType(new Vector(x, y - 1, z), BlockID.GLASS);
         setPosition(new Vector(x + 0.5, y, z + 0.5));
     }

src/main/java/com/sk89q/worldedit/bukkit/BukkitPlayer.java

@@ -19,6 +19,7 @@
 
 package com.sk89q.worldedit.bukkit;
 
+import com.sk89q.worldedit.blocks.BlockID;
 import org.bukkit.GameMode;
 import org.bukkit.Location;
 import org.bukkit.entity.Player;
@@ -150,4 +151,15 @@ public class BukkitPlayer extends LocalPlayer {
     public boolean hasCreativeMode() {
         return player.getGameMode() == GameMode.CREATIVE;
     }
+
+    @Override
+    public void floatAt(int x, int y, int z, boolean alwaysGlass) {
+        if (alwaysGlass || !player.getAllowFlight()) {
+            super.floatAt(x, y, z, alwaysGlass);
+            return;
+        }
+
+        setPosition(new Vector(x + 0.5, y, z + 0.5));
+        player.setFlying(true);
+    }
 }

src/main/java/com/sk89q/worldedit/commands/NavigationCommands.java

@@ -118,6 +118,7 @@ public class NavigationCommands {
         aliases = { "ceil" },
         usage = "[clearance]",
         desc = "Go to the celing",
+        flags = "g",
         min = 0,
         max = 1
     )
@@ -129,7 +130,8 @@ public class NavigationCommands {
         int clearence = args.argsLength() > 0 ?
             Math.max(0, args.getInteger(0)) : 0;
 
-        if (player.ascendToCeiling(clearence)) {
+        final boolean alwaysGlass = args.hasFlag('g');
+        if (player.ascendToCeiling(clearence, alwaysGlass)) {
             player.print("Whoosh!");
         } else {
             player.printError("No free spot above you found.");
@@ -177,6 +179,7 @@ public class NavigationCommands {
         aliases = { "up" },
         usage = "<block>",
         desc = "Go upwards some distance",
+        flags = "g",
         min = 1,
         max = 1
     )
@@ -187,7 +190,8 @@ public class NavigationCommands {
 
         int distance = args.getInteger(0);
 
-        if (player.ascendUpwards(distance)) {
+        final boolean alwaysGlass = args.hasFlag('g');
+        if (player.ascendUpwards(distance, alwaysGlass)) {
             player.print("Whoosh!");
         } else {
             player.printError("You would hit something above you.");