[Travis] Specify env NSUnbufferedIO=YES

Also defines the build task in Rakefile.

.travis.yml

@@ -35,10 +35,9 @@ before_install:
   - git submodule update --init --recursive
 script:
   - pod lib lint --allow-warnings --quick
-  - set -o pipefail
-  - xcodebuild test -scheme Himotoki-Mac -configuration Release ENABLE_TESTABILITY=YES GCC_GENERATE_DEBUGGING_SYMBOLS=NO | xcpretty -c
-  - xcodebuild test -scheme Himotoki-iOS -configuration Release ENABLE_TESTABILITY=YES GCC_GENERATE_DEBUGGING_SYMBOLS=NO -sdk iphonesimulator -destination "name=iPhone 6s" | xcpretty -c
-  - xcodebuild test -scheme Himotoki-tvOS -configuration Release ENABLE_TESTABILITY=YES GCC_GENERATE_DEBUGGING_SYMBOLS=NO -sdk appletvsimulator -destination "name=Apple TV 1080p" | xcpretty -c
-  - xcodebuild build -scheme Himotoki-watchOS -configuration Release GCC_GENERATE_DEBUGGING_SYMBOLS=NO -sdk watchsimulator -destination "name=Apple Watch - 38mm" | xcpretty -c
+  - rake "build[test, Himotoki-Mac, macosx, arch=x86_64]"
+  - rake "build[test, Himotoki-iOS, iphonesimulator, name=iPhone 6s]"
+  - rake "build[test, Himotoki-tvOS, appletvsimulator, name=Apple TV 1080p]"
+  - rake "build[build, Himotoki-watchOS, watchsimulator, name=Apple Watch - 38mm]"
 notifications:
   email: false

Rakefile

@@ -0,0 +1,14 @@
+desc 'Run xcodebuild'
+task :build, [:action, :scheme, :sdk, :destination] do |_, args|
+  cmd = %W(
+    xcodebuild #{args.action}
+    -scheme "#{args.scheme}"
+    -sdk #{args.sdk}
+    -destination "#{args.destination}"
+    -configuration Release
+    ENABLE_TESTABILITY=YES
+    GCC_GENERATE_DEBUGGING_SYMBOLS=NO
+  )
+
+  sh "set -eu -o pipefail && env NSUnbufferedIO=YES #{cmd.join(' ')} | xcpretty"
+end