deno -v should report typescript version

Fixes #993

js/main.ts

@@ -8,6 +8,7 @@ import { libdeno } from "./libdeno";
 import { args } from "./deno";
 import { sendSync, handleAsyncMsgFromRust } from "./dispatch";
 import { promiseErrorExaminer, promiseRejectHandler } from "./promise_util";
+import { version } from "typescript";
 
 function sendStart(): msg.StartRes {
   const builder = new flatbuffers.Builder();
@@ -59,6 +60,14 @@ export default function denoMain() {
     os.exit(0);
   }
 
+  // handle `--version`
+  if (startResMsg.versionFlag()) {
+    console.log("deno:", startResMsg.denoVersion());
+    console.log("v8:", startResMsg.v8Version());
+    console.log("typescript:", version);
+    os.exit(0);
+  }
+
   const cwd = startResMsg.cwd();
   log("cwd", cwd);
 

src/flags.rs

@@ -7,7 +7,6 @@ use std::ffi::CString;
 use std::mem;
 use std::process::exit;
 use std::vec::Vec;
-use version;
 
 // Creates vector of strings, Vec<String>
 #[cfg(test)]
@@ -35,11 +34,6 @@ pub fn process(flags: &DenoFlags) {
     exit(0);
   }
 
-  if flags.version {
-    version::print_version();
-    exit(0);
-  }
-
   let mut log_level = log::LevelFilter::Info;
   if flags.log_debug {
     log_level = log::LevelFilter::Debug;

src/msg.fbs

@@ -121,6 +121,9 @@ table StartRes {
   deps_flag: bool;
   recompile_flag: bool;
   types_flag: bool;
+  version_flag: bool;
+  deno_version: string;
+  v8_version: string;
 }
 
 table CodeFetch {

src/ops.rs

@@ -12,6 +12,7 @@ use msg;
 use resources;
 use resources::Resource;
 use tokio_util;
+use version;
 
 use flatbuffers::FlatBufferBuilder;
 use futures;
@@ -178,6 +179,12 @@ fn op_start(
   let cwd_off =
     builder.create_string(deno_fs::normalize_path(cwd_path.as_ref()).as_ref());
 
+  let v8_version = version::get_v8_version();
+  let v8_version_off = builder.create_string(v8_version);
+
+  let deno_version = version::DENO_VERSION;
+  let deno_version_off = builder.create_string(deno_version);
+
   let inner = msg::StartRes::create(
     &mut builder,
     &msg::StartResArgs {
@@ -186,6 +193,9 @@ fn op_start(
       debug_flag: state.flags.log_debug,
       recompile_flag: state.flags.recompile,
       types_flag: state.flags.types_flag,
+      version_flag: state.flags.version,
+      v8_version: Some(v8_version_off),
+      deno_version: Some(deno_version_off),
       ..Default::default()
     },
   );

src/version.rs

@@ -3,12 +3,11 @@ use libdeno;
 use std::ffi::CStr;
 
 // This is the source of truth for the Deno version. Ignore the value in Cargo.toml.
-const DENO_VERSION: &str = "0.1.8";
+pub const DENO_VERSION: &str = "0.1.8";
 
-pub fn print_version() {
+pub fn get_v8_version() -> &'static str {
   let v = unsafe { libdeno::deno_v8_version() };
   let c_str = unsafe { CStr::from_ptr(v) };
   let version = c_str.to_str().unwrap();
-  println!("deno: {}", DENO_VERSION);
-  println!("v8: {}", version);
+  version
 }