From ccea33df6262e82503942dfdbe45e7baade89caa Mon Sep 17 00:00:00 2001
From: Salman Aljammaz <s@0x65.net>
Date: Sat, 5 Sep 2015 18:03:46 +0300
Subject: [PATCH] repl: don't use tty control codes when $TERM is set to "dumb"

This change stops the REPL from using ANSI control codes for colours
when the TERM environment variable is set to "dumb".

"dumb" is the terminal type with the smallest set of capabilities as
described by terminfo. See:

http://invisible-island.net/ncurses/terminfo.ti.html#toc-_Specials

Related: https://github.com/nodejs/node-v0.x-archive/issues/5344
Related: https://github.com/nodejs/node-v0.x-archive/pull/25506
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
PR-URL: https://github.com/nodejs/node/pull/2712
---
 lib/internal/repl.js               |  5 ++-
 test/parallel/test-repl-envvars.js | 55 ++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 test/parallel/test-repl-envvars.js

diff --git a/lib/internal/repl.js b/lib/internal/repl.js
index b2c74e179c59d0..c1beb85cefd795 100644
--- a/lib/internal/repl.js
+++ b/lib/internal/repl.js
@@ -34,7 +34,10 @@ function createRepl(env, opts, cb) {
   if (parseInt(env.NODE_NO_READLINE)) {
     opts.terminal = false;
   }
-  if (parseInt(env.NODE_DISABLE_COLORS)) {
+  // the "dumb" special terminal, as defined by terminfo, doesn't support
+  // ANSI colour control codes.
+  // see http://invisible-island.net/ncurses/terminfo.ti.html#toc-_Specials
+  if (parseInt(env.NODE_DISABLE_COLORS) || env.TERM === 'dumb') {
     opts.useColors = false;
   }
 
diff --git a/test/parallel/test-repl-envvars.js b/test/parallel/test-repl-envvars.js
new file mode 100644
index 00000000000000..6073144085843d
--- /dev/null
+++ b/test/parallel/test-repl-envvars.js
@@ -0,0 +1,55 @@
+'use strict';
+
+// Flags: --expose-internals
+
+const common = require('../common');
+const stream = require('stream');
+const REPL = require('internal/repl');
+const assert = require('assert');
+const inspect = require('util').inspect;
+
+const tests = [{
+  env: {},
+  expected: { terminal: true, useColors: true }
+},
+{
+  env: { NODE_DISABLE_COLORS: '1' },
+  expected: { terminal: true, useColors: false }
+},
+{
+  env: { NODE_NO_READLINE: '1' },
+  expected: { terminal: false, useColors: false }
+},
+{
+  env: { TERM: 'dumb' },
+  expected: { terminal: true, useColors: false }
+},
+{
+  env: { NODE_NO_READLINE: '1', NODE_DISABLE_COLORS: '1' },
+  expected: { terminal: false, useColors: false }
+},
+{
+  env: { NODE_NO_READLINE: '0' },
+  expected: { terminal: true, useColors: true }
+}];
+
+function run(test) {
+  const env = test.env;
+  const expected = test.expected;
+  const opts = {
+    terminal: true,
+    input: new stream.Readable({ read() {} }),
+    output: new stream.Writable({ write() {} })
+  };
+
+  REPL.createInternalRepl(env, opts, function(err, repl) {
+    if (err) throw err;
+    assert.equal(expected.terminal, repl.terminal,
+                 'Expected ' + inspect(expected) + ' with ' + inspect(env));
+    assert.equal(expected.useColors, repl.useColors,
+                 'Expected ' + inspect(expected) + ' with ' + inspect(env));
+    repl.close();
+  });
+}
+
+tests.forEach(run);