can now pass custom launch command with --options "<custom-command> %command%"

and the launcher can now print the output of Proton/Wine, it didn't do
that previously

babylonia-terminal-sdk/src/game_manager.rs

@@ -1,5 +1,6 @@
-use std::{path::PathBuf, sync::Arc};
+use std::{path::PathBuf, sync::Arc, process::{Command, Stdio}, io::{BufReader, BufRead}};
 
+use dirs::config_dir;
 use downloader::progress::Reporter;
 use log::{debug, info};
 use tokio::fs::create_dir_all;
@@ -11,7 +12,7 @@ use crate::{
         game_component::GameComponent, proton_component::ProtonComponent,
     },
     game_patcher,
-    game_state::GameState,
+    game_state::{GameConfig, GameState},
     utils::{get_game_name, get_game_name_with_executable, github_requester::GithubRequester},
 };
 
@@ -164,16 +165,55 @@ impl GameManager {
         Ok(())
     }
 
-    pub async fn start_game(proton: &Proton, game_dir: PathBuf) {
-        debug!("Wine version : {:?}", proton.wine().version().unwrap());
-        let mut child = proton
-            .run(
-                game_dir
+    pub async fn start_game(proton: &Proton, game_dir: PathBuf, options: Option<String>) {
+        let proton_version = proton.wine().version().unwrap();
+        let exec_path = game_dir
                     .join(get_game_name())
-                    .join(get_game_name_with_executable()),
+                    .join(get_game_name_with_executable());
+
+        debug!("Wine version : {:?}", proton_version);
+        
+        let mut child = if let Some(custom_command) = options {
+            debug!("Starting game with --options -> {}", custom_command);
+            let mut tokens: Vec<&str> = custom_command.split_whitespace().collect();
+
+            // position of the %command%
+            let index = tokens.iter().position(|&s| s == "%command%").expect("You forget to put %command% in your custom launch command");
+
+            Command::new(tokens.get(0).unwrap())
+                .args(&tokens[0..(index - 1)])
+                .arg(proton.python.as_os_str())
+                .arg(GameState::get_config_directory().await.join("proton").join("proton"))
+                .arg("run")
+                .arg(exec_path)
+                .args(&tokens[(index + 1)..tokens.len()])
+                .envs(proton.get_envs())
+                .stdin(Stdio::piped())
+                .stdout(Stdio::piped())
+                .stderr(Stdio::piped())
+                .spawn()
+                .unwrap()
+        } else {
+            debug!("Starting game without --options");
+            proton
+            .run(
+                exec_path,
             )
-            .unwrap();
-        child.wait().expect("The game failed to run");
+            .unwrap()
+        };
+        
+        let stdout = child.stdout.take().unwrap();
+        let mut bufread = BufReader::new(stdout);
+        let mut buf = String::new();
+
+        while let Ok(n) = bufread.read_line(&mut buf) {
+            if n > 0 {
+                info!("[Wine {:?}] : {}", proton_version, buf.trim());
+                buf.clear();
+            } else {
+                break;
+            }
+        }
     }
 }