feat(cli): Add Deno.mainModule

cli/js/lib.deno.ns.d.ts

@@ -1899,6 +1899,9 @@ declare namespace Deno {
    */
   export const args: string[];
 
+  /** The URL of the file that was originally executed from the command-line. */
+  export const scriptUrl: URL;
+
   /** A symbol which can be used as a key for a custom method which will be
    * called when `Deno.inspect()` is called, or when the object is logged to
    * the console. */

cli/js/ops/runtime.ts

@@ -1,6 +1,7 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { sendSync } from "./dispatch_json.ts";
+import { URLImpl } from "../web/url.ts";
 
 export interface Start {
   args: string[];
@@ -10,6 +11,7 @@ export interface Start {
   noColor: boolean;
   pid: number;
   repl: boolean;
+  scriptUrl: URL;
   target: string;
   tsVersion: string;
   unstableFlag: boolean;
@@ -18,7 +20,9 @@ export interface Start {
 }
 
 export function opStart(): Start {
-  return sendSync("op_start");
+  const s = sendSync("op_start");
+  s.scriptUrl = new URLImpl(s.scriptUrl);
+  return s;
 }
 
 export interface Metrics {

cli/js/runtime_main.ts

@@ -95,11 +95,12 @@ export function bootstrapMainRuntime(): void {
     }
   });
 
-  const { args, cwd, noColor, pid, repl, unstableFlag } = runtime.start();
+  const { args, cwd, noColor, pid, repl, scriptUrl, unstableFlag } = runtime.start();
 
   Object.defineProperties(denoNs, {
     pid: readOnly(pid),
     noColor: readOnly(noColor),
+    scriptUrl: readOnly(scriptUrl),
     args: readOnly(Object.freeze(args)),
   });
 

cli/ops/runtime.rs

@@ -31,6 +31,7 @@ fn op_start(
     "noColor": !colors::use_color(),
     "pid": std::process::id(),
     "repl": gs.flags.subcommand == DenoSubcommand::Repl,
+    "scriptUrl": state.main_module.to_string(),
     "target": env!("TARGET"),
     "tsVersion": version::TYPESCRIPT,
     "unstableFlag": gs.flags.unstable,

cli/tests/integration_tests.rs

@@ -442,7 +442,7 @@ fn ts_dependency_recompilation() {
     function print(str: string): void {
         console.log(str);
     }
-    
+
     print(foo);",
   )
   .unwrap();
@@ -1645,6 +1645,11 @@ itest!(import_meta {
   output: "import_meta.ts.out",
 });
 
+itest!(script_url {
+  args: "run --quiet --reload script_url.ts",
+  output: "script_url.ts.out",
+});
+
 itest!(lib_ref {
   args: "run --quiet --unstable --reload lib_ref.ts",
   output: "lib_ref.ts.out",

cli/tests/script_url.ts

@@ -0,0 +1,3 @@
+console.log("script_url", Deno.scriptUrl.pathname);
+
+import "./script_url2.ts";

cli/tests/script_url.ts.out

@@ -0,0 +1,2 @@
+script_url2 [WILDCARD]tests/script_url.ts
+script_url [WILDCARD]tests/script_url.ts

cli/tests/script_url2.ts

@@ -0,0 +1 @@
+console.log("script_url2", Deno.scriptUrl.pathname);