Internal to external (#51)

Add a simple form of internal->external support

src/cli.rs

@@ -212,14 +212,11 @@ async fn process_line(readline: Result<String, ReadlineError>, ctx: &mut Context
                     },
 
                     (
-                        Some(ClassifiedCommand::Internal(ref i)),
+                        Some(ClassifiedCommand::Internal(left)),
-                        Some(ClassifiedCommand::External(ref e)),
+                        Some(ClassifiedCommand::External(_)),
-                    ) => {
+                    ) => match left.run(ctx, input).await {
-                        return LineResult::Error(ShellError::string(&format!(
+                        Ok(val) => ClassifiedInputStream::from_input_stream(val),
-                            "Unimplemented Internal({}) -> External({})",
+                        Err(err) => return LineResult::Error(err),
-                            i.name(),
-                            e.name()
-                        )))
                     }
 
                     (

src/commands/classified.rs

@@ -105,10 +105,6 @@ impl InternalCommand {
 
         Ok(stream.boxed() as InputStream)
     }
-
-    crate fn name(&self) -> &str {
-        self.command.name()
-    }
 }
 
 crate struct ExternalCommand {
@@ -129,10 +125,33 @@ impl ExternalCommand {
         input: ClassifiedInputStream,
         stream_next: StreamNext,
     ) -> Result<ClassifiedInputStream, ShellError> {
+        let inputs: Vec<Value> = input.objects.collect().await;
+
+        let mut arg_string = format!("{}", self.name);
+        for arg in &self.args {
+            arg_string.push_str(" ");
+            arg_string.push_str(&arg);
+        }
         let mut process = Exec::shell(&self.name);
 
-        for arg in self.args {
+        if arg_string.contains("$it") {
-            process = process.arg(arg)
+            let mut first = true;
+            for i in &inputs {
+                if !first {
+                    process = process.arg("&&");
+                    process = process.arg(&self.name);
+                } else {
+                    first = false;
+                }
+
+                for arg in &self.args {
+                    process = process.arg(&arg.replace("$it", &i.as_string().unwrap()));
+                }        
+            }
+        } else {
+            for arg in &self.args {
+                process = process.arg(arg);
+            }
         }
 
         process = process.cwd(context.env.lock().unwrap().cwd());
@@ -168,8 +187,4 @@ impl ExternalCommand {
             }
         }
     }
-
-    crate fn name(&self) -> &str {
-        &self.name[..]
-    }
 }