Add length check on title

Fixes #15

Author: SnowyCoder

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>xyz.upperlevel.spigot.book</groupId>
     <artifactId>spigot-book-api</artifactId>
-    <version>1.4</version>
+    <version>1.4.1</version>
 
     <name>BookApi</name>
     <description>A low-level API for book control on spigot</description>

src/main/java/xyz/upperlevel/spigot/book/BookUtil.java

@@ -89,11 +89,17 @@ public BookBuilder(ItemStack book) {
         }
 
         /**
-         * Sets the title of the book
+         * Sets the title of the book.
+         *
+         * It should always be at most 32 characters.
+         *
          * @param title the title of the book
          * @return the BookBuilder's calling instance
          */
         public BookBuilder title(String title) {
+            if (title.length() > 32) {
+                throw new IllegalArgumentException("The book title must be at most 32 characters");
+            }
             meta.setTitle(title);
             return this;
         }
@@ -149,7 +155,7 @@ public BookBuilder pages(List<BaseComponent[]> pages) {
         }
 
         /**
-         * Sets the generation of the book
+         * Sets the generation of the book.
          * Only works from MC 1.10
          * @param generation the Book generation
          * @return the BookBuilder calling instance

src/test/java/xyz/upperlevel/spigot/book/example/Main.java

@@ -26,14 +26,20 @@ public boolean onCommand(CommandSender sender, Command cmd, String label, String
             if (sender instanceof Player) {
                 ItemStack book = createGeneralBook((Player) sender, args.length < 1 ? "" : args[0]);
 
-                BookUtil.openPlayer((Player) sender, book);
+                if (book != null) {
+                    BookUtil.openPlayer((Player) sender, book);
+                } else {
+                    sender.sendMessage("Subcommands: color, command, link, game, general or none");
+                }
             }
 
             return true;
         }
 
         private ItemStack createGeneralBook(Player p, String type) {
             switch (type.toLowerCase()) {
+                case "":
+                    return createPresentationBook(p);
                 case "color":
                     return createColorBook(p);
                 case "command":
@@ -45,7 +51,7 @@ private ItemStack createGeneralBook(Player p, String type) {
                 case "general":
                     return createGeneralBook(p);
                 default:
-                    return createPresentationBook(p);
+                    return null;
             }
         }
 
@@ -128,7 +134,7 @@ private ItemStack createCommandBook(Player p) {
                             new BookUtil.PageBuilder()
                                     .add(
                                             BookUtil.TextBuilder.of("Suicide")
-                                                    .onHover(BookUtil.HoverAction.showText("Wannt to try?"))
+                                                    .onHover(BookUtil.HoverAction.showText("Wanna try?"))
                                                     .onClick(BookUtil.ClickAction.runCommand("/kill"))
                                                     .color(ChatColor.RED)
                                                     .build()