Add extension information commands

src/command.rs

@@ -54,7 +54,11 @@ pub fn handle_command(
             }
         }
         _ => {
-            let found = match extensions.run_command(vectorized_command[0].to_string(), client_number) {
+            let found = match extensions.run_command(
+                vectorized_command[0].to_string(),
+                client_number,
+                stream,
+            ) {
                 Ok(result) => result,
                 Err(error) => {
                     error!("Rhai plugin error: {}", error);

src/extensions.rs

@@ -5,19 +5,74 @@ use std::{
     collections::HashMap,
     ffi::OsStr,
     fs,
+    net::TcpStream,
     path::Path,
     sync::{Arc, Mutex},
 };
 
-use crate::{error::AppError, player::Player, utils::send_chat_message};
+use crate::{
+    error::AppError,
+    player::Player,
+    utils::{send_chat_message, write_chat_stream},
+};
 
 pub struct Extensions {
     extensions: Vec<Extension>,
 }
 
 impl Extensions {
-    pub fn run_command(&self, key: String, player: u8) -> Result<bool, AppError> {
-        // Bool success
+    pub fn run_command(
+        &self,
+        key: String,
+        player: u8,
+        stream: &mut TcpStream,
+    ) -> Result<bool, AppError> {
+        // Here I'm calling write_chat_stream multiple times. This is because the stock minecraft
+        // chat has a length limit of 64 characters, which is pathetically small. There is a
+        // classic extension to support an unlimited number of characters, but it's not guaranteed
+        // that the client will support it, so the next best option is to just send multiple
+        // messages, they're newline seperated anyway. I am aware that repeated stream writes are
+        // not the best option however, and that at some point I should switch to buffered streams.
+        // TODO: Use buffered streams (That's everywhere not just here)
+
+        // Reserve extension listing command
+        if &key == "extensions" {
+            let _ = write_chat_stream(stream, "Extension listing".to_string());
+
+            for extension in &self.extensions {
+                let _ = write_chat_stream(
+                    stream,
+                    format!(
+                        "&a{} &bv{}",
+                        extension.metadata.name,
+                        extension.metadata.version.display()
+                    ),
+                );
+            }
+
+            return Ok(true);
+        }
+
+        // Reserve command listing command
+        if &key == "commands" {
+            let _ = write_chat_stream(stream, "Command listing".to_string());
+
+            for extension in &self.extensions {
+                for command in extension.commands.keys() {
+                    let _ = write_chat_stream(
+                        stream,
+                        format!(
+                            "&c{} &a[{}]",
+                            command,
+                            extension.metadata.name
+                        ),
+                    );
+                }
+            }
+
+            return Ok(true);
+        }
+
         for extension in &self.extensions {
             if let Some(key_value) = extension.commands.get(&key) {
                 key_value.call::<()>(&extension.engine, &extension.ast, (player,))?;
@@ -233,7 +288,7 @@ impl Extensions {
                 &mut scope,
                 &current_extension.ast,
                 "init",
-                (PlayersWrapper::new(players.0.clone()),)
+                (PlayersWrapper::new(players.0.clone()),),
             ) {
                 Ok(result) => result,
                 Err(error) => {

src/extensions/ping-pong.rhai

@@ -0,0 +1,16 @@
+fn metadata() {
+    Metadata("ping-pong", Version("1.0.0"))
+}
+
+fn init(players) {
+    let ctx = Context(players);
+
+    ctx.register_command("ping", |player| {
+        players.send_message(player, "pong")
+    });
+    ctx.register_command("foo", |player| {
+        players.send_message(player, "bar")
+    });
+
+    ctx
+}

src/utils.rs

@@ -6,9 +6,9 @@ use std::net::TcpStream;
 use std::sync::{Arc, Mutex};
 
 use crate::error::AppError;
-use crate::World;
-use crate::SpecialPlayers;
 use crate::Player;
+use crate::SpecialPlayers;
+use crate::World;
 
 pub fn to_mc_string(text: &str) -> [u8; 64] {
     let text_vec: Vec<char> = text.chars().take(64).collect();
@@ -104,7 +104,11 @@ pub fn despawn_player(player_id: u8) -> Vec<u8> {
     [0x0C, player_id].to_vec()
 }
 
-pub fn send_chat_message(source_id: u8, mut source_username: String, mut message: String) -> Vec<u8> {
+pub fn send_chat_message(
+    source_id: u8,
+    mut source_username: String,
+    mut message: String,
+) -> Vec<u8> {
     let mut ret_val: Vec<u8> = vec![];
     ret_val.push(0x0D);
 
@@ -119,6 +123,14 @@ pub fn send_chat_message(source_id: u8, mut source_username: String, mut message
     ret_val
 }
 
+pub fn write_chat_stream(stream: &mut TcpStream, message: String) {
+    let _ = stream.write(&send_chat_message(
+        SpecialPlayers::SelfPlayer as u8,
+        "".to_string(),
+        message,
+    ));
+}
+
 pub fn set_position_and_orientation(
     player_id: u8,
     pos_x: i16,
@@ -189,9 +201,7 @@ pub fn send_level_data(world_arc_clone: &Arc<Mutex<World>>) -> Result<Vec<u8>, A
     if remaining_chunk_size > 0 {
         ret_val.push(0x03);
 
-        ret_val.append(&mut stream_write_short(
-            remaining_chunk_size.try_into()?,
-        ));
+        ret_val.append(&mut stream_write_short(remaining_chunk_size.try_into()?));
 
         let mut remaining_data_buffer = [0u8; 1024];
         for i in 0..remaining_chunk_size {
@@ -238,4 +248,3 @@ pub fn bomb_server_details(
     let _ = stream.write(&compound_data);
     Ok(())
 }
-

src/world.rs

@@ -2,6 +2,8 @@ use std::fs::{self, File};
 use std::io::Write;
 use std::sync::{Arc, Mutex};
 
+use log::info;
+
 use crate::error::AppError;
 
 #[derive(Debug)]
@@ -61,8 +63,10 @@ impl World {
             }
 
             world.data = world_data_raw[6..].to_vec();
+            info!("Loaded world {}", "world.wrld");
             Ok(world)
         } else {
+            info!("Creating word {}", "world.wrld");
             Ok(World {
                 size_x: 64,
                 size_y: 32,
@@ -75,7 +79,9 @@ impl World {
     pub fn save(world_arc_clone: Arc<Mutex<World>>) -> Result<(), AppError> {
         let mut to_write: Vec<u8> = Vec::new();
         {
-            let mut world_dat = world_arc_clone.lock().map_err(|e| AppError::MutexPoisoned(e.to_string()))?;
+            let mut world_dat = world_arc_clone
+                .lock()
+                .map_err(|e| AppError::MutexPoisoned(e.to_string()))?;
 
             to_write.push((world_dat.size_x >> 8) as u8);
             to_write.push((world_dat.size_x & 0xFF) as u8);