Fix tab completion and usage

Core/src/main/java/com/plotsquared/core/command/HomeCommand.java

@@ -34,19 +34,22 @@ import com.plotsquared.core.plot.PlotArea;
 import com.plotsquared.core.plot.PlotId;
 import com.plotsquared.core.util.MainUtil;
 import com.plotsquared.core.util.MathMan;
+import com.plotsquared.core.util.TabCompletions;
 import com.plotsquared.core.util.query.PlotQuery;
 import com.plotsquared.core.util.query.SortingStrategy;
 import com.plotsquared.core.util.task.RunnableVal2;
 import com.plotsquared.core.util.task.RunnableVal3;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;
 
 @CommandDeclaration(command = "home",
                     description = "Teleport to your plot(s)",
                     permission = "plots.home",
-                    usage = "/plot home [<page>|<alias>|<area;x;y>|<area> <x;y>]",
+                    usage = "/plot home [<page>|<alias>|<area;x;y>|<area> <x;y>|<area> <page>]",
                     aliases = {"h"},
                     requiredType = RequiredType.PLAYER,
                     category = CommandCategory.TELEPORT)
@@ -166,4 +169,28 @@ public class HomeCommand extends Command {
         return CompletableFuture.completedFuture(true);
     }
 
+    @Override
+    public Collection<Command> tab(PlotPlayer player, String[] args, boolean space) {
+        final List<Command> completions = new ArrayList<>();
+        switch (args.length - 1) {
+            case 0:
+                completions.addAll(
+                        TabCompletions.completeAreas(args[0]));
+                if (args[0].isEmpty()) {
+                    // if no input is given, only suggest 1 - 3
+                    completions.addAll(
+                            TabCompletions.asCompletions("1", "2", "3"));
+                    break;
+                }
+                // complete more numbers from the already given input
+                completions.addAll(
+                        TabCompletions.completeNumbers(args[0], 10, 999));
+                break;
+            case 1:
+                completions.addAll(
+                        TabCompletions.completeNumbers(args[1], 10, 999));
+                break;
+        }
+        return completions;
+    }
 }

Core/src/main/java/com/plotsquared/core/command/Visit.java

@@ -40,12 +40,11 @@ import com.plotsquared.core.util.query.PlotQuery;
 import com.plotsquared.core.util.query.SortingStrategy;
 import com.plotsquared.core.util.task.RunnableVal2;
 import com.plotsquared.core.util.task.RunnableVal3;
-import com.plotsquared.core.uuid.UUIDMapping;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
@@ -54,7 +53,7 @@ import java.util.concurrent.TimeoutException;
 @CommandDeclaration(command = "visit",
     permission = "plots.visit",
     description = "Visit someones plot",
-    usage = "/plot visit <<player>|<alias>|<world>> [#]",
+    usage = "/plot visit <player>|<alias>|<plot> [area]|[#] [#]",
     aliases = {"v", "tp", "teleport", "goto", "warp"},
     requiredType = RequiredType.PLAYER,
     category = CommandCategory.TELEPORT)
@@ -153,7 +152,7 @@ public class Visit extends Command {
         int page = Integer.MIN_VALUE;
 
         switch (args.length) {
-            // /p v [...] [...] <page>
+            // /p v <user> <area> <page>
             case 3:
                 if (!MathMan.isInteger(args[2])) {
                     Captions.NOT_VALID_NUMBER.send(player, "(1, ∞)");
@@ -228,24 +227,32 @@ public class Visit extends Command {
     }
 
     @Override public Collection<Command> tab(PlotPlayer player, String[] args, boolean space) {
-        final List<Command> completions = new LinkedList<>();
+        final List<Command> completions = new ArrayList<>();
         switch (args.length - 1) {
             case 0:
-                this.completeNumbers(completions, args[0], 0);
                 completions.addAll(TabCompletions.completePlayers(args[0], Collections.emptyList()));
-            break;
+                break;
             case 1:
-                if (MathMan.isInteger(args[0])) {
+                completions.addAll(
+                        TabCompletions.completeAreas(args[1]));
+                if (args[1].isEmpty()) {
+                    // if no input is given, only suggest 1 - 3
+                    completions.addAll(
+                            TabCompletions.asCompletions("1", "2", "3"));
                     break;
                 }
-                this.completeNumbers(completions, args[1], 0);
+                completions.addAll(
-                this.completeAreas(completions, args[1]);
+                        TabCompletions.completeNumbers(args[1], 10, 999));
                 break;
             case 2:
-                if (MathMan.isInteger(args[1])) {
+                if (args[2].isEmpty()) {
+                    // if no input is given, only suggest 1 - 3
+                    completions.addAll(
+                            TabCompletions.asCompletions("1", "2", "3"));
                     break;
                 }
-                this.completeNumbers(completions, args[2], 0);
+                completions.addAll(
+                        TabCompletions.completeNumbers(args[2], 10, 999));
                 break;
         }
 

Core/src/main/java/com/plotsquared/core/util/TabCompletions.java

@@ -34,6 +34,7 @@ import com.plotsquared.core.command.RequiredType;
 import com.plotsquared.core.configuration.Settings;
 import com.plotsquared.core.player.PlotPlayer;
 import com.plotsquared.core.plot.Plot;
+import com.plotsquared.core.plot.PlotArea;
 import com.plotsquared.core.uuid.UUIDMapping;
 import lombok.experimental.UtilityClass;
 import org.jetbrains.annotations.NotNull;
@@ -136,6 +137,65 @@ public class TabCompletions {
         return Collections.emptyList();
     }
 
+    /**
+     * Get a list of integer numbers matching the given input. If the input string
+     * is empty, nothing will be returned. The list is unmodifiable.
+     *
+     * @param input        Input to filter with
+     * @param amountLimit  Maximum amount of suggestions
+     * @param highestLimit Highest number to include
+     * @return Unmodifiable list of number completions
+     */
+    @NotNull public List<Command> completeNumbers(@NotNull final String input,
+                                                  final int amountLimit, final int highestLimit) {
+        if (input.isEmpty() || input.length() > highestLimit || !MathMan.isInteger(input)) {
+            return Collections.emptyList();
+        }
+        int offset;
+        try {
+            offset = Integer.parseInt(input) * 10;
+        } catch (NumberFormatException ignored) {
+            return Collections.emptyList();
+        }
+        final List<String> commands = new ArrayList<>();
+        for (int i = offset; i < highestLimit && (offset - i + amountLimit) > 0; i++) {
+            commands.add(String.valueOf(i));
+        }
+        return asCompletions(commands.toArray(new String[0]));
+    }
+
+    /**
+     * Get a list of plot areas matching the given input.
+     * The list is unmodifiable.
+     *
+     * @param input Input to filter with
+     * @return Unmodifiable list of area completions
+     */
+    @NotNull public List<Command> completeAreas(@NotNull final String input) {
+        final List<Command> completions = new ArrayList<>();
+        for (final PlotArea area : PlotSquared.get().getPlotAreas()) {
+            String areaName = area.getWorldName();
+            if (area.getId() != null) {
+                areaName += ";" + area.getId();
+            }
+            if (!areaName.toLowerCase().startsWith(input.toLowerCase())) {
+                continue;
+            }
+            completions.add(new Command(null, false, areaName, "",
+                    RequiredType.NONE, null) {});
+        }
+        return Collections.unmodifiableList(completions);
+    }
+
+    @NotNull public List<Command> asCompletions(String... toFilter) {
+        final List<Command> completions = new ArrayList<>();
+        for (String completion : toFilter) {
+            completions.add(new Command(null, false, completion, "",
+                    RequiredType.NONE, null) {});
+        }
+        return Collections.unmodifiableList(completions);
+    }
+
     /**
      * @param cacheIdentifier Cache key
      * @param input           Command input