Phase 5: Ausführung und Output implementieren und archivieren

crates/tb-runtime/src/host.rs

@@ -158,6 +158,15 @@ pub mod taste {
 }
 
 pub trait Host {
+    /// None means the frontend has scheduled a terminal handoff; retry the
+    /// same request after it supplies the child result.
+    fn shell(&mut self, command: &str) -> Result<Option<i32>, crate::errors::RuntimeError> {
+        shell_command(command)
+            .status()
+            .map(|s| Some(s.code().unwrap_or(0)))
+            .map_err(|_| crate::errors::RuntimeError(53))
+    }
+
     /// Aktuellen Bildschirmzustand anzeigen.
     fn present(&mut self, screen: &TextScreen);
 
@@ -388,3 +397,12 @@ mod tests {
         assert_eq!(h.next_event(false), None);
     }
 }
+
+/// Shared child command, inheriting the foreground terminal and stdio.
+pub fn shell_command(command: &str) -> std::process::Command {
+    let mut child = std::process::Command::new(if cfg!(windows) { "cmd" } else { "sh" });
+    if !command.is_empty() {
+        child.args([if cfg!(windows) { "/C" } else { "-c" }, command]);
+    }
+    child
+}