Make it possible to specify the custom durability through the level.

In other words:
'283':
  other:
	enchantments:
	  NO_DURABILITY: 50

src/main/java/org/shininet/bukkit/itemrenamer/ItemRenamerCommands.java

@@ -477,7 +477,7 @@ public RenameRule apply(@Nullable RenameRule input) {
 				};
 			}
 		});
-		return String.format("Added the enchantment '%s' to every item.", LeveledEnchantment.parse(args));
+		return String.format("Added enchantment to every selected item.");
 	}
 
 	private String addDechantment(CommandSender sender, final Deque<String> args) {
@@ -499,7 +499,7 @@ public RenameRule apply(@Nullable RenameRule input) {
 				};
 			}
 		});
-		return String.format("Dechanted '%s' for every item.", LeveledEnchantment.parse(args));
+		return String.format("Dechanted every selected item.");
 	}
 
 	/**

src/main/java/org/shininet/bukkit/itemrenamer/configuration/RenameRule.java

@@ -1,13 +1,13 @@
 package org.shininet.bukkit.itemrenamer.configuration;
 
 import java.util.Collection;
+import java.util.Iterator;
 import java.util.Set;
 
 import javax.annotation.Nonnull;
 
 import org.shininet.bukkit.itemrenamer.utils.CollectionsUtil;
 import org.shininet.bukkit.itemrenamer.wrappers.LeveledEnchantment;
-
 import com.google.common.base.Objects;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
@@ -168,10 +168,14 @@ public Builder enchantments(Collection<LeveledEnchantment> enchantments) {
 		public Builder mergeEnchantments(@Nonnull Collection<LeveledEnchantment> enchantments) {
 			Preconditions.checkNotNull(enchantments, "enchantments cannot be NULL.");
 
-			if (this.enchantments != null)
+			if (this.enchantments != null) {
+				for (LeveledEnchantment enchantment : enchantments)
+					removeByType(this.enchantments, enchantment);
+
 				this.enchantments.addAll(enchantments);
-			else
+			} else {
 				enchantments(enchantments);
+			}
 			return this;
 		}
 
@@ -193,13 +197,30 @@ public Builder dechantments(Collection<LeveledEnchantment> dechantments) {
 		public Builder mergeDechantments(@Nonnull Collection<LeveledEnchantment> dechantments) {
 			Preconditions.checkNotNull(dechantments, "dechantments cannot be NULL.");
 
-			if (this.dechantments != null)
+			if (this.dechantments != null) {
+				for (LeveledEnchantment enchantment : enchantments)
+					removeByType(this.enchantments, enchantment);
+
 				this.dechantments.addAll(dechantments);
-			else
+			} else {
 				dechantments(dechantments);
+			}
 			return this;
 		}
 
+		/**
+		 * Remove all enchantments of the same type (custom or a specific vanilla enchantments).
+		 * @param source - the source set.
+		 * @param other - the other enchantment.
+		 */
+		private void removeByType(Set<LeveledEnchantment> source, LeveledEnchantment other) {
+			for (Iterator<LeveledEnchantment> it = source.iterator(); it.hasNext(); ) {
+				if (other.sameType(it.next())) {
+					it.remove();
+				}
+			}
+		}
+
 		/**
 		 * Remove enchantments and dechantments that cancel each other.
 		 */

src/main/java/org/shininet/bukkit/itemrenamer/enchants/HideDurabilityEnchanter.java

@@ -3,9 +3,19 @@
 import org.bukkit.inventory.ItemStack;
 
 public class HideDurabilityEnchanter implements Enchanter {
+	private final int newDurability;
+
+	/**
+	 * Hide the real durability of an item by replacing it with the given durability,
+	 * @param newDurability - the new durability.
+	 */
+	public HideDurabilityEnchanter(int newDurability) {
+		this.newDurability = newDurability;
+	}
+
 	@Override
 	public ItemStack enchant(ItemStack stack) {
-		stack.setDurability((short) 0);
+		stack.setDurability((short) newDurability);
 		return stack;
 	}
 

src/main/java/org/shininet/bukkit/itemrenamer/wrappers/LeveledEnchantment.java

@@ -152,7 +152,7 @@ else if (custom == CustomEnchantment.GLOW)
 			else if (custom == CustomEnchantment.NO_ATTRIBUTES)
 				enchanter = new HideAttributesEnchanter();
 			else if (custom == CustomEnchantment.NO_DURABILITY)
-				enchanter = new HideDurabilityEnchanter();
+				enchanter = new HideDurabilityEnchanter(level);
 			else
 				throw new IllegalStateException("Invalid custom enchantment: " + custom);
 		}
@@ -167,6 +167,18 @@ public int getLevel() {
 		return level;
 	}
 
+	/**
+	 * Determine if the given leveled enchantment is of the same type.
+	 * @param other - the other enchantment.
+	 * @return TRUE if it is, FALSE otherwise.
+	 */
+	public boolean sameType(LeveledEnchantment other) {
+		if (hasCustomEnchantment())
+			return other.hasCustomEnchantment() && other.getCustom() == custom;
+		else
+			return !other.hasCustomEnchantment() && other.getEnchantment() == enchantment;
+	}
+
 	/**
 	 * Determine if this leveled enchantment represents a custom type.
 	 * @return TRUE if it does, FALSE otherwise.