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src/config.yml

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+# F Key Command by Akkariin
+# Support PlaceholderAPI variable, you need to install the PlaceholderAPI plugin.
+# Support multiple command, Separate each command with ";".
+# If the command has a ";", you can use %3B to replace it.
+# Press the F key under normal status.
+NormalF: ""
+# Press the F key under sneaking status.
+SneakingF: ""
+# Press the F key under look up status.
+LookUpF: ""
+# Press the F key under look down status.
+LookDownF: ""
+# The command cooldown time(seconds)
+Delay: 0
+# If the player press the key too fast
+TooFast: "&c[&6FKeyCommand&c] &ePlease slow down."

src/net/zerodream/fkey.java

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+package net.zerodream;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+import me.clip.placeholderapi.PlaceholderAPI;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.event.Listener;
+import org.bukkit.Bukkit;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.event.player.PlayerSwapHandItemsEvent;
+import org.bukkit.event.EventHandler;
+import org.bukkit.entity.Player;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+
+public class fkey extends JavaPlugin implements Listener {
+
+    public static Boolean usePlaceholder = true;
+    public static FileConfiguration config;
+    public Map<String, Long> cooldown = new HashMap<>();
+
+    @Override
+    public void onEnable() {
+
+        getLogger().info("FKeyCommand Enable!");
+        File file = new File(getDataFolder(), "config.yml");
+        Bukkit.getPluginCommand("fkey").setExecutor(this);
+        if (!getDataFolder().exists()) {
+            getDataFolder().mkdir();
+            getLogger().info("Plugin config folder not exist");
+        }
+        if (!file.exists()) {
+            this.saveDefaultConfig();
+            getLogger().info("Successful save config!");
+            this.reloadConfig();
+            getLogger().info("New config is loaded to memory");
+        }
+        config = this.load(file);
+        Bukkit.getPluginManager().registerEvents(this, this);
+        if (Bukkit.getPluginManager().isPluginEnabled("PlaceholderAPI")) {
+            getLogger().info("Found PlaceholderAPI plugin, the variable is available now");
+            usePlaceholder = true;
+        }
+    }
+
+    @EventHandler
+    public void onPlayerSwapHandItems(PlayerSwapHandItemsEvent event) {
+        Player player = event.getPlayer();
+        float view = player.getLocation().getPitch();
+        if (view <= -80) {
+            this.runCommand(player, "LookUpF", event);
+            return;
+        }
+        if (view >= 80) {
+            this.runCommand(player, "LookDownF", event);
+            return;
+        }
+        if (player.isSneaking()) {
+            this.runCommand(player, "SneakingF", event);
+            return;
+        }
+        this.runCommand(player, "NormalF", event);
+    }
+
+    private boolean checkPermission(Player player, String perm) {
+        return (player.hasPermission("fkey." + perm.toLowerCase()) || player.hasPermission("fkey.*") || player.hasPermission("fkey.use") || player.isOp());
+    }
+
+    private void runCommand(Player player, String name, PlayerSwapHandItemsEvent event) {
+        String command = config.getString(name);
+        if (command == null || command.equals("")) {
+            event.setCancelled(false);
+            return;
+        }
+        if (!checkPermission(player, name)) {
+            sendMsg(player, "&cYou don't have permission to do this.");
+            return;
+        }
+        int wait = config.getInt("Delay") * 1000;
+        if (!cooldown.containsKey(player.getUniqueId().toString())) {
+            cooldown.put(player.getUniqueId().toString(), new Date().getTime() - wait);
+        } else {
+            long latest = cooldown.get(player.getUniqueId().toString()) + wait;
+            if (new Date().getTime() < latest) {
+                String message = ChatColor.translateAlternateColorCodes('&', config.getString("TooFast"));
+                if (usePlaceholder) {
+                    message = format(player, message);
+                }
+                player.sendMessage(message);
+                return;
+            }
+        }
+        if (command.contains(";")) {
+            String[] cmds = command.split(";");
+            for (String cmd : cmds) {
+                cmd = cmd.replace("%3B", ";");
+                if (usePlaceholder) {
+                    cmd = format(player, cmd);
+                }
+                player.chat("/" + cmd);
+            }
+        } else {
+            if (usePlaceholder) {
+                command = format(player, command);
+            }
+            player.chat("/" + command);
+        }
+        cooldown.replace(player.getUniqueId().toString(), new Date().getTime());
+        event.setCancelled(true);
+    }
+
+    public String format(Player player, String str) {
+        try {
+            str = PlaceholderAPI.setPlaceholders(player, str);
+        } catch (java.lang.NoClassDefFoundError ex) {
+            getLogger().info(ex.getLocalizedMessage());
+        }
+        return str;
+    }
+
+    @Override
+    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+        if (command.getName().equalsIgnoreCase("fkey")) {
+            if (sender instanceof Player) {
+                if (!Bukkit.getPlayer(sender.getName()).hasPermission("fkey.admin")) {
+                    sender.sendMessage(ChatColor.RED + "Permission denied");
+                    return true;
+                }
+            }
+            try {
+                if (args[0].toLowerCase().equals("reload")) {
+                    File file = new File(getDataFolder(), "config.yml");
+                    config = this.load(file);
+                    sendMsg(sender, "&aConfig reload successful");
+                }
+            } catch (Exception ex) {
+                pluginHelp(sender);
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private void pluginHelp(CommandSender sender) {
+        sendMsg(sender, "&c&l—[ &6F Key &bCommand &c&l]—");
+        sendMsg(sender, "&c/fkey help   &6Display this help");
+        sendMsg(sender, "&c/fkey reload &6Reload config");
+    }
+
+    private void sendMsg(CommandSender sender, String msg) {
+        msg = ChatColor.translateAlternateColorCodes('&', msg);
+        sender.sendMessage(msg);
+    }
+
+    public FileConfiguration load(File file) {
+        if (!(file.exists())) {
+            try {
+                file.createNewFile();
+            } catch (IOException e) {
+            }
+        }
+        return YamlConfiguration.loadConfiguration(file);
+    }
+}

src/plugin.yml

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+name: FKeyCommand
+main: net.zerodream.fkey
+version: 1.2.0
+author: Akkariin
+softdepend: [PlaceholderAPI]
+
+commands:
+    fkey:
+        description: "F key command"
+        usage: "§c/fkey §6F key command"
+        permission: "fkey.use"
+        permission-message: "§6You don't have permission §cfkey.use"