Make print_file_info async

cli/main.rs

@@ -51,6 +51,7 @@ use flags::DenoFlags;
 use flags::DenoSubcommand;
 use futures::lazy;
 use futures::Future;
+use futures::future;
 use log::{LevelFilter, Metadata, Record};
 use std::env;
 
@@ -92,15 +93,15 @@ where
   }
 }
 
-pub fn print_file_info(worker: &Worker, url: &str) {
-  let maybe_out =
-    state::fetch_module_meta_data_and_maybe_compile(&worker.state, url, ".");
-  if let Err(err) = maybe_out {
-    println!("{}", err);
-    return;
-  }
-  let out = maybe_out.unwrap();
-
+pub fn print_file_info(
+  worker: Worker,
+  url: &str,
+) -> impl Future<Item = Worker, Error = ()> {
+  worker::fetch_module_meta_data_and_maybe_compile_async(
+    &worker.state,
+    url,
+    ".",
+  ).and_then(move |out| {
     println!("{} {}", ansi::bold("local:".to_string()), &(out.filename));
 
     println!(
@@ -126,7 +127,7 @@ pub fn print_file_info(worker: &Worker, url: &str) {
     }
 
 	let modules = worker.modules.lock().unwrap();
-  if let Some(deps) = modules.deps(&out.module_name) {
+    if let Some(deps) = worker.modules.deps(&out.module_name) {
       println!("{}{}", ansi::bold("deps:\n".to_string()), deps.name);
       if let Some(ref depsdeps) = deps.deps {
         for d in depsdeps {
@@ -139,6 +140,8 @@ pub fn print_file_info(worker: &Worker, url: &str) {
         ansi::bold("deps:".to_string()),
       );
     }
+    Ok(worker)
+  }).map_err(|err| println!("{}", err))
 }
 
 fn create_worker_and_state(
@@ -195,8 +198,11 @@ fn fetch_or_info_command(
       .execute_mod_async(&main_url, true)
       .and_then(move |()| {
         if print_info {
-          print_file_info(&worker, &main_module);
+          future::Either::A(print_file_info(worker, &main_module))
+        } else {
+          future::Either::B(future::ok(worker))
         }
+      }).and_then(|worker| {
         worker.then(|result| {
           js_check(result);
           Ok(())