Adds deno.noColor

Docs.md

@@ -305,6 +305,17 @@ import { test, assertEqual } from "./package.ts";
 This design circumvents a plethora of complexity spawned by package management
 software, centralized code repositories, and superfluous file formats.
 
+## Environmental Variables
+
+There are several env vars that control how Deno behaves:
+
+`DENO_DIR` defaults to `$HOME/.deno` but can be set to any path to control where
+generated and cached source code is written and read to.
+
+`NO_COLOR` will turn off color output if set. See https://no-color.org/. User
+code can test if `NO_COLOR` was set without having `--allow-env` by using the
+boolean constant `deno.noColor`.
+
 ## Browser compatibility
 
 The subset of Deno programs which are written completely in JavaScript and do

js/deno.ts

@@ -1,7 +1,7 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 
 // Public deno module.
-export { pid, env, exit, isTTY } from "./os";
+export { noColor, pid, env, exit, isTTY } from "./os";
 export { chdir, cwd } from "./dir";
 export {
   File,

js/main.ts

@@ -39,7 +39,7 @@ export default function denoMain() {
     os.exit(0);
   }
 
-  os.setPid(startResMsg.pid());
+  os.setGlobals(startResMsg.pid(), startResMsg.noColor());
 
   const cwd = startResMsg.cwd();
   log("cwd", cwd);

js/os.ts

@@ -9,9 +9,13 @@ import * as util from "./util";
 /** process id */
 export let pid: number;
 
-export function setPid(pid_: number): void {
+/** Reflects the NO_COLOR enviromental variable: https://no-color.org/ */
+export let noColor: boolean;
+
+export function setGlobals(pid_: number, noColor_: boolean): void {
   assert(!pid);
   pid = pid_;
+  noColor = noColor_;
 }
 
 interface CodeInfo {

src/msg.fbs

@@ -160,6 +160,7 @@ table StartRes {
   version_flag: bool;
   deno_version: string;
   v8_version: string;
+  no_color: bool;
 }
 
 table WorkerGetMessage {

src/ops.rs

@@ -1,5 +1,7 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 
+use atty;
+use crate::ansi;
 use crate::errors;
 use crate::errors::{DenoError, DenoResult, ErrorKind};
 use crate::fs as deno_fs;
@@ -18,8 +20,6 @@ use crate::resources::table_entries;
 use crate::resources::Resource;
 use crate::tokio_util;
 use crate::version;
-
-use atty;
 use flatbuffers::FlatBufferBuilder;
 use futures;
 use futures::Async;
@@ -33,10 +33,6 @@ use std;
 use std::convert::From;
 use std::fs;
 use std::net::Shutdown;
-#[cfg(unix)]
-use std::os::unix::fs::PermissionsExt;
-#[cfg(unix)]
-use std::os::unix::process::ExitStatusExt;
 use std::path::Path;
 use std::path::PathBuf;
 use std::process::Command;
@@ -48,6 +44,11 @@ use tokio::net::TcpStream;
 use tokio_process::CommandExt;
 use tokio_threadpool;
 
+#[cfg(unix)]
+use std::os::unix::fs::PermissionsExt;
+#[cfg(unix)]
+use std::os::unix::process::ExitStatusExt;
+
 type OpResult = DenoResult<Buf>;
 
 // TODO Ideally we wouldn't have to box the Op being returned.
@@ -266,6 +267,7 @@ fn op_start(
       version_flag: state.flags.version,
       v8_version: Some(v8_version_off),
       deno_version: Some(deno_version_off),
+      no_color: !ansi::use_color(),
       ..Default::default()
     },
   );

tests/no_color.js

@@ -0,0 +1,2 @@
+import { noColor } from "deno";
+console.log("noColor", noColor);

tools/test.py

@@ -8,6 +8,7 @@
 from deno_dir_test import deno_dir_test
 from setup_test import setup_test
 from util import build_path, enable_ansi_colors, executable_suffix, run, rmtree
+from util import run_output, tests_path, green_ok
 from unit_tests import unit_tests
 from util_test import util_test
 from benchmark_test import benchmark_test
@@ -25,6 +26,19 @@ def check_exists(filename):
         sys.exit(1)
 
 
+def test_no_color(deno_exe):
+    sys.stdout.write("no_color test...")
+    sys.stdout.flush()
+    t = os.path.join(tests_path, "no_color.js")
+    output = run_output([deno_exe, t], merge_env={"NO_COLOR": "1"})
+    assert output.strip() == "noColor true"
+    t = os.path.join(tests_path, "no_color.js")
+    output = run_output([deno_exe, t])
+    assert output.strip() == "noColor false"
+    print green_ok()
+
+
+
 def main(argv):
     if len(argv) == 2:
         build_dir = sys.argv[1]
@@ -81,6 +95,8 @@ def main(argv):
 
     deno_dir_test(deno_exe, deno_dir)
 
+    test_no_color(deno_exe)
+
 
 if __name__ == '__main__':
     sys.exit(main(sys.argv))