Adds commands for adding book title pages and for deleting book pages

src/main/java/net/knarcraft/bookswithoutborders/BooksWithoutBorders.java

@@ -1,10 +1,12 @@
 package net.knarcraft.bookswithoutborders;
 
+import net.knarcraft.bookswithoutborders.command.CommandAddTitlePage;
 import net.knarcraft.bookswithoutborders.command.CommandBooksWithoutBorders;
 import net.knarcraft.bookswithoutborders.command.CommandClear;
 import net.knarcraft.bookswithoutborders.command.CommandCopy;
 import net.knarcraft.bookswithoutborders.command.CommandDecrypt;
 import net.knarcraft.bookswithoutborders.command.CommandDelete;
+import net.knarcraft.bookswithoutborders.command.CommandDeletePage;
 import net.knarcraft.bookswithoutborders.command.CommandDeletePublic;
 import net.knarcraft.bookswithoutborders.command.CommandEncrypt;
 import net.knarcraft.bookswithoutborders.command.CommandFormat;
@@ -230,6 +232,8 @@ public class BooksWithoutBorders extends JavaPlugin {
         registerCommand("setBookGeneration", new CommandSetGeneration());
         registerCommand("clearBook", new CommandClear());
         registerCommand("setBookshelfData", new CommandSetBookshelfData());
+        registerCommand("addBookTitlePage", new CommandAddTitlePage());
+        registerCommand("deleteBookPage", new CommandDeletePage());
     }
 
     /**

src/main/java/net/knarcraft/bookswithoutborders/command/CommandAddTitlePage.java

@@ -0,0 +1,155 @@
+package net.knarcraft.bookswithoutborders.command;
+
+import net.knarcraft.bookswithoutborders.BooksWithoutBorders;
+import net.knarcraft.bookswithoutborders.config.BooksWithoutBordersConfig;
+import net.knarcraft.bookswithoutborders.utility.BookFormatter;
+import net.knarcraft.bookswithoutborders.utility.InventoryHelper;
+import net.md_5.bungee.api.ChatColor;
+import org.bukkit.Material;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabExecutor;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A command for adding a title page to a book
+ */
+public class CommandAddTitlePage implements TabExecutor {
+
+    @Override
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String s,
+                             @NotNull String[] arguments) {
+        if (!(sender instanceof Player player)) {
+            BooksWithoutBorders.sendErrorMessage(sender, "This command can only be used by a player!");
+            return false;
+        }
+
+
+        ItemStack heldBook = InventoryHelper.getHeldBook(player);
+        if (heldBook == null) {
+            BooksWithoutBorders.sendErrorMessage(sender, "You must be holding a book to perform this command");
+            return false;
+        }
+
+        int index;
+        if (arguments.length < 1) {
+            if (InventoryHelper.notHoldingOneWrittenBookCheck(player, "You must be holding a written book to " +
+                    "add an author title page!", "You cannot add an author title page to two books at once!")) {
+                return false;
+            }
+
+            index = 0;
+        } else {
+            try {
+                index = Integer.parseInt(arguments[0]) - 1;
+            } catch (NumberFormatException exception) {
+                BooksWithoutBorders.sendErrorMessage(sender, "Invalid page index given!");
+                return false;
+            }
+        }
+
+        String title = null;
+
+        if (arguments.length > 1) {
+            // Get all arguments as a space-separated string
+            StringBuilder builder = new StringBuilder(arguments[1]);
+            for (int i = 2; i < arguments.length; i++) {
+                builder.append(" ").append(arguments[i]);
+            }
+            title = builder.toString();
+        }
+
+        BookMeta bookMeta = (BookMeta) heldBook.getItemMeta();
+        if (bookMeta == null) {
+            BooksWithoutBorders.sendErrorMessage(sender, "Unable to get metadata for the held book!");
+            return false;
+        }
+        List<String> pages = new ArrayList<>(bookMeta.getPages());
+
+        if (index < 0) {
+            BooksWithoutBorders.sendErrorMessage(sender, "The given page index is out of bounds!");
+            return false;
+        }
+
+        if (title == null && heldBook.getType() == Material.WRITTEN_BOOK) {
+            String loreSeparator = BooksWithoutBordersConfig.getLoreSeparator();
+            if (index > pages.size()) {
+                pages.add(formatTitle(bookMeta.getTitle() + loreSeparator + "By: " + bookMeta.getAuthor()));
+            } else {
+                pages.add(index, formatTitle(bookMeta.getTitle() + loreSeparator + "By: " + bookMeta.getAuthor()));
+            }
+        } else if (title == null) {
+            if (index > pages.size()) {
+                pages.add("");
+            } else {
+                pages.add(index, "");
+            }
+        } else {
+            if (index > pages.size()) {
+                pages.add(formatTitle(title));
+            } else {
+                pages.add(index, formatTitle(title));
+            }
+        }
+        bookMeta.setPages(pages);
+        heldBook.setItemMeta(bookMeta);
+        BooksWithoutBorders.sendSuccessMessage(sender, "Title page added!");
+        return true;
+    }
+
+    /**
+     * Formats a book title
+     *
+     * @param input <p>The input to format</p>
+     * @return <p>The formatted input</p>
+     */
+    private String formatTitle(@NotNull String input) {
+        String loreSeparator = BooksWithoutBordersConfig.getLoreSeparator();
+        if (input.contains(loreSeparator)) {
+            String[] parts = input.split(loreSeparator);
+            StringBuilder output = new StringBuilder("\n");
+            output.append(ChatColor.UNDERLINE).append(ChatColor.BOLD).append(BookFormatter.stripColor(parts[0])).append(ChatColor.RESET);
+
+            for (int i = 1; i < parts.length; i++) {
+                output.append("\n").append("\n").append(ChatColor.ITALIC).append(BookFormatter.stripColor(parts[i])).append(ChatColor.RESET);
+            }
+            return output.toString();
+        } else {
+            return ChatColor.UNDERLINE + ChatColor.BOLD.toString() + input;
+        }
+    }
+
+    @Nullable
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String s,
+                                      @NotNull String[] arguments) {
+        if (arguments.length == 1) {
+            if (!(commandSender instanceof Player player)) {
+                return List.of("1", "2", "3", "4");
+            }
+            ItemStack heldBook = InventoryHelper.getHeldBook(player);
+            if (heldBook != null) {
+                BookMeta bookMeta = (BookMeta) heldBook.getItemMeta();
+                if (bookMeta != null) {
+                    List<String> pages = new ArrayList<>();
+                    pages.add("1");
+                    for (int i = 1; i <= bookMeta.getPages().size(); i++) {
+                        pages.add(String.valueOf(i + 1));
+                    }
+                    return pages;
+                }
+            }
+        } else if (arguments.length == 2) {
+            return List.of("Title", "Chapter~Description");
+        }
+        return List.of();
+    }
+
+}

src/main/java/net/knarcraft/bookswithoutborders/command/CommandDeletePage.java

@@ -0,0 +1,91 @@
+package net.knarcraft.bookswithoutborders.command;
+
+import net.knarcraft.bookswithoutborders.BooksWithoutBorders;
+import net.knarcraft.bookswithoutborders.utility.InventoryHelper;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabExecutor;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A command for deleting a single page from a book
+ */
+public class CommandDeletePage implements TabExecutor {
+
+    @Override
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String s, @NotNull String[] arguments) {
+        if (!(sender instanceof Player player)) {
+            BooksWithoutBorders.sendErrorMessage(sender, "This command can only be used by a player!");
+            return false;
+        }
+
+        if (arguments.length == 0) {
+            BooksWithoutBorders.sendErrorMessage(sender, "You must supply a page index");
+            return false;
+        }
+
+        ItemStack heldBook = InventoryHelper.getHeldBook(player);
+        if (heldBook == null) {
+            BooksWithoutBorders.sendErrorMessage(sender, "You must be holding a book to perform this command");
+            return false;
+        }
+
+        int index;
+        try {
+            index = Integer.parseInt(arguments[0]) - 1;
+        } catch (NumberFormatException exception) {
+            BooksWithoutBorders.sendErrorMessage(sender, "Invalid page index given!");
+            return false;
+        }
+
+        BookMeta bookMeta = (BookMeta) heldBook.getItemMeta();
+        if (bookMeta == null) {
+            BooksWithoutBorders.sendErrorMessage(sender, "Unable to get metadata for the held book!");
+            return false;
+        }
+        List<String> pages = new ArrayList<>(bookMeta.getPages());
+
+        if (index < 0 || index >= pages.size()) {
+            BooksWithoutBorders.sendErrorMessage(sender, "The given page index is out of bounds!");
+            return false;
+        }
+
+        pages.remove(index);
+
+        bookMeta.setPages(pages);
+        heldBook.setItemMeta(bookMeta);
+        BooksWithoutBorders.sendSuccessMessage(sender, "Page deleted!");
+        return true;
+    }
+
+    @Nullable
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String s,
+                                      @NotNull String[] arguments) {
+        if (arguments.length == 1) {
+            if (!(commandSender instanceof Player player)) {
+                return List.of("1", "2", "3", "4");
+            }
+            ItemStack heldBook = InventoryHelper.getHeldBook(player);
+            if (heldBook != null) {
+                BookMeta bookMeta = (BookMeta) heldBook.getItemMeta();
+                if (bookMeta != null) {
+                    List<String> pages = new ArrayList<>();
+                    for (int i = 0; i < bookMeta.getPages().size(); i++) {
+                        pages.add(String.valueOf(i + 1));
+                    }
+                    return pages;
+                }
+            }
+        }
+        return List.of();
+    }
+
+}

src/main/java/net/knarcraft/bookswithoutborders/utility/InventoryHelper.java

@@ -18,6 +18,25 @@ public final class InventoryHelper {
     private InventoryHelper() {
     }
 
+    /**
+     * Gets the book from a player's main hand
+     *
+     * @param player <p>The player holding the book</p>
+     * @return <p>The held book, or null if not holding one book in the main hand</p>
+     */
+    public static ItemStack getHeldBook(@NotNull Player player) {
+        @NotNull ItemSlot heldSigned = InventoryHelper.getHeldSlotBook(player, true, true,
+                true, true);
+        @NotNull ItemSlot heldUnSigned = InventoryHelper.getHeldSlotBook(player, true, true,
+                true, false);
+        if (heldSigned == ItemSlot.MAIN_HAND || heldUnSigned == ItemSlot.MAIN_HAND) {
+            boolean holdingSigned = heldSigned == ItemSlot.MAIN_HAND;
+            return InventoryHelper.getHeldBook(player, holdingSigned);
+        } else {
+            return null;
+        }
+    }
+
     /**
      * Gets the book the holder is playing
      *

src/main/resources/plugin.yml

@@ -101,6 +101,14 @@ commands:
     description: Sets custom data for a chiseled bookshelf used when peeking at the bookshelf
     usage: /<command> <delete/name/lore> <text> [more text]
     permission: bookswithoutborders.editbookshelf
+  addBookTitlePage:
+    description: Adds a blank page, title page or chapter page depending on input and whether the book is signed
+    usage: /<command> [page index] [title~description]
+    permission: bookswithoutborders.addtitlepage
+  deleteBookPage:
+    description: Deletes one page from a book
+    usage: /<command> <page>
+    permission: bookswithoutborders.deletepage
 permissions:
   bookswithoutborders.*:
     description: Grants all permissions
@@ -147,6 +155,8 @@ permissions:
       bookswithoutborders.setlore: true
       bookswithoutborders.format: true
       bookswithoutborders.setgeneration: true
+      bookswithoutborders.addtitlepage: true
+      bookswithoutborders.deletepage: true
   bookswithoutborders.format:
     description: Allows a player to format a book
   bookswithoutborders.save:
@@ -200,4 +210,8 @@ permissions:
   bookswithoutborders.peekbookshelf:
     description: Allows player to left-click a bookshelf to see the contents of the shelf
   bookswithoutborders.editbookshelf:
-    description: Allows player to set name/lore for bookshelves, used for peeking
+    description: Allows player to set name/lore for bookshelves, used for peeking
+  bookswithoutborders.addtitlepage:
+    description: Allows player to add a blank title page to a book
+  bookswithoutborders.deletepage:
+    description: Allows player to delete a page from a book