Detach GUI from terminal on linux, hide console on Windows

crates/pipeview-gui/src/main.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(windows, windows_subsystem = "windows")]
+
 mod app;
 mod app_state;
 mod buffers;
@@ -9,7 +11,41 @@ mod ui_fonts;
 
 use pipeview_client::SessionManager;
 
+/// On Linux, when launched from a file manager, a terminal emulator may be spawned
+/// to run this binary. We re-spawn ourselves detached so the terminal can close
+/// while the GUI window persists.
+#[cfg(target_os = "linux")]
+fn ensure_detached() {
+    use std::os::unix::process::CommandExt;
+    use std::process;
+
+    if std::env::var("PIPEVIEW_DETACHED").is_ok() {
+        return;
+    }
+
+    let exe = match std::env::current_exe() {
+        Ok(p) => p,
+        Err(_) => return,
+    };
+
+    let args: Vec<String> = std::env::args().skip(1).collect();
+
+    let _ = process::Command::new(&exe)
+        .args(&args)
+        .env("PIPEVIEW_DETACHED", "1")
+        .stdin(process::Stdio::null())
+        .stdout(process::Stdio::null())
+        .stderr(process::Stdio::null())
+        .process_group(0)
+        .spawn();
+
+    process::exit(0);
+}
+
 fn main() {
+    #[cfg(target_os = "linux")]
+    ensure_detached();
+
     tracing_subscriber::fmt()
         .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
         .init();