Convert table of primitives to positional arguments for external cmd (#2232)

* Convert table of primitives to positional arguments for external cmd

* Multiple file test, fix for cococo

crates/nu-cli/src/commands/classified/external.rs

@@ -62,10 +62,30 @@ async fn run_with_stdin(
         }
 
         // Do the cleanup that we need to do on any argument going out:
+        match &value.value {
+            UntaggedValue::Table(table) => {
+                for t in table {
+                    match &t.value {
+                        UntaggedValue::Primitive(_) => {
+                            command_args
+                                .push(t.convert_to_string().trim_end_matches('\n').to_string());
+                        }
+                        _ => {
+                            return Err(ShellError::labeled_error(
+                                "Could not convert to positional arguments",
+                                "could not convert to positional arguments",
+                                value.tag(),
+                            ));
+                        }
+                    }
+                }
+            }
+            _ => {
                 let trimmed_value_string = value.as_string()?.trim_end_matches('\n').to_string();
-
                 command_args.push(trimmed_value_string);
             }
+        }
+    }
 
     let process_args = command_args
         .iter()

crates/nu-cli/src/utils/test_bins.rs

@@ -7,12 +7,7 @@ pub fn cococo() {
         // Write back out all the arguments passed
         // if given at least 1 instead of chickens
         // speaking co co co.
-        let mut arguments = args.iter();
-        arguments.next();
-
-        for arg in arguments {
-            println!("{}", &arg);
-        }
+        println!("{}", &args[1..].join(" "));
     } else {
         println!("cococo");
     }

tests/shell/pipeline/commands/external.rs

@@ -271,3 +271,34 @@ mod tilde_expansion {
         assert_eq!(actual.out, "1~1");
     }
 }
+
+mod external_command_arguments {
+    use super::nu;
+    use nu_test_support::fs::Stub::EmptyFile;
+    use nu_test_support::{pipeline, playground::Playground};
+    #[test]
+    fn expands_table_of_primitives_to_positional_arguments() {
+        Playground::setup(
+            "expands_table_of_primitives_to_positional_arguments",
+            |dirs, sandbox| {
+                sandbox.with_files(vec![
+                    EmptyFile("jonathan_likes_cake.txt"),
+                    EmptyFile("andres_likes_arepas.txt"),
+                    EmptyFile("ferris_not_here.txt"),
+                ]);
+
+                let actual = nu!(
+                cwd: dirs.test(), pipeline(
+                r#"
+                    nu --testbin cococo $(ls | get name)
+                "#
+                ));
+
+                assert_eq!(
+                    actual.out,
+                    "andres_likes_arepas.txt ferris_not_here.txt jonathan_likes_cake.txt"
+                );
+            },
+        )
+    }
+}