Improve external output in subexprs (#294)

crates/nu-command/src/filesystem/cd.rs

@@ -43,6 +43,6 @@ impl Command for Cd {
         //FIXME: this only changes the current scope, but instead this environment variable
         //should probably be a block that loads the information from the state in the overlay
         stack.add_env_var("PWD".into(), path);
-        Ok(PipelineData::new())
+        Ok(PipelineData::new(call.head))
     }
 }

crates/nu-command/src/filesystem/cp.rs

@@ -204,6 +204,6 @@ impl Command for Cp {
             }
         }
 
-        Ok(PipelineData::new())
+        Ok(PipelineData::new(call.head))
     }
 }

crates/nu-command/src/filesystem/mv.rs

@@ -130,7 +130,7 @@ impl Command for Mv {
             move_file(call, &entry, &destination)?
         }
 
-        Ok(PipelineData::new())
+        Ok(PipelineData::new(call.head))
     }
 }
 

crates/nu-command/src/filesystem/touch.rs

@@ -49,6 +49,6 @@ impl Command for Touch {
             }
         }
 
-        Ok(PipelineData::new())
+        Ok(PipelineData::new(call.head))
     }
 }