Fixes various tab completion problems

src/main/java/net/knarcraft/paidsigns/command/AddCommand.java

@@ -26,7 +26,7 @@ public class AddCommand extends TokenizedCommand {
             return false;
         }
 
-        String signName = arguments.get(0);
+        String signName = arguments.get(0).trim();
         double cost;
         try {
             cost = Double.parseDouble(arguments.get(1));

src/main/java/net/knarcraft/paidsigns/command/AddConditionTabCompleter.java

@@ -27,16 +27,18 @@ public class AddConditionTabCompleter extends TokenizedTabCompleter {
         if (lineIndices == null) {
             initializeValues();
         }
-        if (argumentSize < 1) {
-            return TabCompleteHelper.getPaidSignNames();
-        } else if (argumentSize < 2) {
-            return this.lineIndices;
-        } else if (argumentSize < 3) {
-            return stringsToMatch;
-        } else if (argumentSize < 4) {
-            return booleans;
-        } else if (argumentSize < 6) {
-            return optionStates;
+        if (argumentSize == 1) {
+            return TabCompleteHelper.filterMatchingStartsWith(TabCompleteHelper.getPaidSignNames(), arguments.get(0));
+        } else if (argumentSize == 2) {
+            return TabCompleteHelper.filterMatchingStartsWith(this.lineIndices, arguments.get(1));
+        } else if (argumentSize == 3) {
+            return TabCompleteHelper.filterMatchingStartsWith(stringsToMatch, arguments.get(2));
+        } else if (argumentSize == 4) {
+            return TabCompleteHelper.filterMatchingStartsWith(booleans, arguments.get(3));
+        } else if (argumentSize == 5) {
+            return TabCompleteHelper.filterMatchingStartsWith(optionStates, arguments.get(4));
+        } else if (argumentSize == 6) {
+            return TabCompleteHelper.filterMatchingStartsWith(optionStates, arguments.get(5));
         }
         return new ArrayList<>();
     }

src/main/java/net/knarcraft/paidsigns/command/AddTabCompleter.java

@@ -35,14 +35,16 @@ public class AddTabCompleter extends TokenizedTabCompleter {
             loadAvailablePermissions();
         }
 
-        if (argumentSize < 1) {
-            return names;
-        } else if (argumentSize < 2) {
-            return costs;
-        } else if (argumentSize < 3) {
+        if (argumentSize == 1) {
+            return TabCompleteHelper.filterMatchingStartsWith(names, arguments.get(0));
+        } else if (argumentSize == 2) {
+            return TabCompleteHelper.filterMatchingStartsWith(costs, arguments.get(1));
+        } else if (argumentSize == 3) {
             return tabCompletePermission(arguments.get(arguments.size() - 1));
-        } else if (argumentSize < 5) {
-            return options;
+        } else if (argumentSize == 4) {
+            return TabCompleteHelper.filterMatchingStartsWith(options, arguments.get(3));
+        } else if (argumentSize == 5) {
+            return TabCompleteHelper.filterMatchingStartsWith(options, arguments.get(4));
         }
         return new ArrayList<>();
     }

src/main/java/net/knarcraft/paidsigns/command/ListTabCompleter.java

@@ -20,22 +20,19 @@ public class ListTabCompleter extends TokenizedTabCompleter {
     @Override
     public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias,
                                       @NotNull String[] args) {
-        if (argumentSize < 1) {
-            return TabCompleteHelper.getPaidSignNames();
-        } else if (argumentSize < 2) {
+        if (argumentSize == 1) {
+            return TabCompleteHelper.filterMatchingStartsWith(TabCompleteHelper.getPaidSignNames(), arguments.get(0));
+        } else if (argumentSize == 2) {
             PaidSign sign = PaidSigns.getInstance().getSignManager().getPaidSign(arguments.get(0));
             if (sign != null) {
                 List<String> availableConditions = new ArrayList<>();
                 for (Short signLine : sign.getConditions().keySet()) {
                     availableConditions.add(String.valueOf(signLine + 1));
                 }
-                return availableConditions;
-            } else {
-                return TabCompleteHelper.getSignLines();
+                return TabCompleteHelper.filterMatchingStartsWith(availableConditions, arguments.get(1));
+            }
         }
-        } else {
         return new ArrayList<>();
     }
-    }
 
 }

src/main/java/net/knarcraft/paidsigns/command/RemoveConditionTabCompleter.java

@@ -27,18 +27,16 @@ public class RemoveConditionTabCompleter extends TokenizedTabCompleter {
             initializeValues();
         }
 
-        if (argumentSize < 1) {
-            return TabCompleteHelper.getPaidSignNames();
-        } else if (argumentSize < 2) {
+        if (argumentSize == 1) {
+            return TabCompleteHelper.filterMatchingStartsWith(TabCompleteHelper.getPaidSignNames(), arguments.get(0));
+        } else if (argumentSize == 2) {
             PaidSign sign = PaidSigns.getInstance().getSignManager().getPaidSign(arguments.get(0));
             if (sign != null) {
                 List<String> availableConditions = new ArrayList<>();
                 for (Short signLine : sign.getConditions().keySet()) {
                     availableConditions.add(String.valueOf(signLine + 1));
                 }
-                return availableConditions;
-            } else {
-                return TabCompleteHelper.getSignLines();
+                return TabCompleteHelper.filterMatchingStartsWith(availableConditions, arguments.get(1));
             }
         }
         return new ArrayList<>();

src/main/java/net/knarcraft/paidsigns/command/TokenizedTabCompleter.java

@@ -19,12 +19,16 @@ public class TokenizedTabCompleter implements TabCompleter {
 
     @Nullable
     @Override
-    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, @NotNull String[] args) {
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias,
+                                      @NotNull String[] args) {
         arguments = Tokenizer.tokenize(String.join(" ", args));
         if (args.length == 0) {
             argumentSize = 0;
         } else {
-            argumentSize = args[args.length - 1].isEmpty() ? arguments.size() : arguments.size() - 1;
+            if (args[args.length - 1].isEmpty()) {
+                arguments.add("");
+            }
+            argumentSize = arguments.size();
         }
         return null;
     }

src/main/java/net/knarcraft/paidsigns/container/PaidSign.java

@@ -29,7 +29,7 @@ public class PaidSign {
      */
     public PaidSign(String name, double cost, String permission, OptionState ignoreCase, OptionState ignoreColor) {
         if (name == null || name.trim().isBlank()) {
-            throw new IllegalArgumentException("Id cannot be empty");
+            throw new IllegalArgumentException("Name cannot be empty");
         }
         if (cost <= 0) {
             throw new IllegalArgumentException("Cost must be larger than 0");

src/main/java/net/knarcraft/paidsigns/utility/Tokenizer.java

@@ -15,10 +15,21 @@ public final class Tokenizer {
     /**
      * Tokenizes a string
      *
-     * @param input <p>A string.</p>
-     * @return <p>A list of tokens.</p>
+     * @param input <p>A string</p>
+     * @return <p>A list of tokens</p>
      */
     public static List<String> tokenize(String input) {
+        return tokenize(input, true);
+    }
+
+    /**
+     * Tokenizes a string
+     *
+     * @param input            <p>A string</p>
+     * @param allowEmptyQuotes <p>Whether to treat "" as a token</p>
+     * @return <p>A list of tokens</p>
+     */
+    public static List<String> tokenize(String input, boolean allowEmptyQuotes) {
         List<String> tokens = new ArrayList<>();
         boolean startedQuote = false;
         StringBuilder currentToken = new StringBuilder();
@@ -33,7 +44,7 @@ public final class Tokenizer {
                 case '"':
                     if (startedQuote) {
                         //This quote signifies the end of the argument
-                        if (isNotEmpty(currentToken)) {
+                        if (allowEmptyQuotes || isNotEmpty(currentToken)) {
                             tokens.add(currentToken.toString());
                             currentToken = new StringBuilder();
                         }