$it: add conversion from Path for external commands (#1210)

* $it: add conversion from Path for external commands (#1203)

* Replace PathBuf::to_str with to_string_lossy

src/commands/classified/external.rs

@@ -88,6 +88,10 @@ async fn run_with_iterator_arg(
                 value: UntaggedValue::Primitive(Primitive::Line(s)),
                 ..
             } => Ok(s.clone()),
+            Value {
+                value: UntaggedValue::Primitive(Primitive::Path(p)),
+                ..
+            } => Ok(p.to_string_lossy().to_string()),
             _ => {
                 let arg = args.iter().find(|arg| arg.contains("$it"));
                 if let Some(arg) = arg {