Allow --silent option for commands to quiet the output

lib/ember_cli/command.rb

@@ -25,11 +25,16 @@ def process_watcher
  options.fetch(:watcher) { EmberCli.configuration.watcher }
  end
 
+ def silent?
+ options.fetch(:silent) { false }
+ end
+
  def ember_build(watch: false)
  line = Cocaine::CommandLine.new(paths.ember, [
  "build",
  ("--watch" if watch),
  ("--watcher :watcher" if process_watcher),
+ ("--silent" if silent?),
  "--environment :environment",
  "--output-path :output_path",
  ].compact.join(" "))

spec/lib/ember_cli/command_spec.rb

@@ -54,6 +54,29 @@
  end
  end
 
+ context 'when configured not to be silent' do
+ it 'exludes the `--silent` flag' do
+ paths = build_paths
+ command = build_command(paths: paths)
+
+ expect(command.build).not_to match(/--silent/)
+
+ paths = build_paths
+ command = build_command(paths: paths, options: { silent: false })
+
+ expect(command.build).not_to match(/--silent/)
+ end
+ end
+
+ context 'when configured to be silent' do
+ it 'includes includes `--silent` flag' do
+ paths = build_paths
+ command = build_command(paths: paths, options: { silent: true })
+
+ expect(command.build).to match(/--silent/)
+ end
+ end
+
  context "when configured to watch" do
  it "includes the `--watch` flag" do
  paths = build_paths