chore(gulp): add a task to print dart & pub versions

Author: vicb

gulpfile.js

@@ -38,6 +38,7 @@ var insert = require('gulp-insert');
 var uglify = require('gulp-uglify');
 var shouldLog = require('./tools/build/logging');
 var tslint = require('gulp-tslint');
+var dartSdk = require('./tools/build/dart');
 
 require('./tools/check-environment')({
   requiredNpmVersion: '>=2.9.0',
@@ -103,7 +104,7 @@ function runJasmineTests(globs, done) {
 }
 
 // Note: when DART_SDK is not found, all gulp tasks ending with `.dart` will be skipped.
-var DART_SDK = require('./tools/build/dartdetect')(gulp);
+var DART_SDK = dartSdk.detect(gulp);
 
 // -----------------------
 // configuration
@@ -457,7 +458,12 @@ gulp.task('test.js', function(done) {
 });
 
 gulp.task('test.dart', function(done) {
-  runSequence('test.transpiler.unittest', 'docs/test', 'test.unit.dart/ci', sequenceComplete(done));
+  runSequence('versions.dart', 'test.transpiler.unittest', 'docs/test', 'test.unit.dart/ci',
+              sequenceComplete(done));
+});
+
+gulp.task('versions.dart', function() {
+  dartSdk.logVersion(DART_SDK);
 });
 
 // Reuse the Travis scripts

scripts/ci/env_dart.sh

@@ -93,6 +93,5 @@ if [[ -z $ENV_SET ]]; then
   echo PATH=$PATH
   echo NGDART_BASE_DIR=$NGDART_BASE_DIR
   echo NGDART_SCRIPT_DIR=$NGDART_SCRIPT_DIR
-  $DART --version 2>&1
 
 fi

tools/build/dartdetect.js renamed to tools/build/dart.js

@@ -1,10 +1,10 @@
 var which = require('which');
+var spawnSync = require('child_process').spawnSync;
 
-module.exports = function(gulp) {
+module.exports.detect = function(gulp) {
   var DART_SDK = false;
   try {
     which.sync('dart');
-    console.log('Dart SDK detected');
     if (process.platform === 'win32') {
       DART_SDK = {
         ANALYZER: 'dartanalyzer.bat',
@@ -20,6 +20,7 @@ module.exports = function(gulp) {
         VM: 'dart'
       };
     }
+    console.log('Dart SDK detected:');
   } catch (e) {
     console.log('Dart SDK is not available, Dart tasks will be skipped.');
     var gulpTaskFn = gulp.task.bind(gulp);
@@ -35,3 +36,9 @@ module.exports = function(gulp) {
   }
   return DART_SDK;
 }
+
+module.exports.logVersion = function(dartSdk) {
+  console.log('DART SDK:') ;
+  console.log('- dart: ' + spawnSync(dartSdk.VM, ['--version']).stderr.toString().replace(/\n/g, ''));
+  console.log('- pub: ' + spawnSync(dartSdk.PUB, ['--version']).stdout.toString().replace(/\n/g, ''));
+}