fixes PR006

crates/tools/prometeu-cli/src/main.rs

@@ -1,7 +1,7 @@
 use clap::{Parser, Subcommand};
 use std::env;
 use std::path::{Path, PathBuf};
-use std::process::Command;
+use std::process::{Command, ExitStatus};
 
 /// PROMETEU Dispatcher (CLI).
 ///
@@ -158,9 +158,13 @@ fn execute_bin(bin_path: &Path, args: &[&str]) {
         .status();
 
     match status {
-        Ok(status) => {
-            std::process::exit(status.code().unwrap_or(0));
-        }
+        Ok(status) => match child_exit_code(status) {
+            Ok(code) => std::process::exit(code),
+            Err(message) => {
+                eprintln!("Error: {} ({})", message, bin_path.display());
+                std::process::exit(1);
+            }
+        },
         Err(e) => {
             eprintln!("Error executing {}: {}", bin_path.display(), e);
             std::process::exit(1);
@@ -172,3 +176,57 @@ fn not_implemented(cmd: &str, _bin_name: &str) {
     eprintln!("prometeu: command '{}' is not yet available in this distribution", cmd);
     std::process::exit(1);
 }
+
+fn child_exit_code(status: ExitStatus) -> Result<i32, &'static str> {
+    status.code().ok_or("child process terminated without a numeric exit code")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::child_exit_code;
+    use std::process::ExitStatus;
+
+    #[test]
+    fn child_exit_code_preserves_zero() {
+        let status = exit_status_with_code(0);
+        assert_eq!(child_exit_code(status), Ok(0));
+    }
+
+    #[test]
+    fn child_exit_code_preserves_non_zero_one() {
+        let status = exit_status_with_code(1);
+        assert_eq!(child_exit_code(status), Ok(1));
+    }
+
+    #[test]
+    fn child_exit_code_preserves_non_zero_other() {
+        let status = exit_status_with_code(42);
+        assert_eq!(child_exit_code(status), Ok(42));
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn child_exit_code_rejects_status_without_numeric_code() {
+        use std::os::unix::process::ExitStatusExt;
+
+        let status = ExitStatus::from_raw(9);
+        assert_eq!(
+            child_exit_code(status),
+            Err("child process terminated without a numeric exit code")
+        );
+    }
+
+    #[cfg(unix)]
+    fn exit_status_with_code(code: i32) -> ExitStatus {
+        use std::os::unix::process::ExitStatusExt;
+
+        ExitStatus::from_raw(code << 8)
+    }
+
+    #[cfg(windows)]
+    fn exit_status_with_code(code: i32) -> ExitStatus {
+        use std::os::windows::process::ExitStatusExt;
+
+        ExitStatus::from_raw(code as u32)
+    }
+}