[travis] New build script.

In addition to building & testing AsyncDisplayKit, this new build script
can ensure that all example projects still compile.  This will prevent
breaking API changes from landing without updating sample projects that
use them.  It's also extensible, so we can add additional integration
tests in future (e.g., non-CocoaPods framework integration).

.travis.yml

@@ -5,8 +5,9 @@ before_install:
   - gem update cocoapods
   - xcrun simctl list
 env:
-  - TEST_OS=8.1
-script: ./build.sh $TEST_OS
+  - MODE=tests
+  - MODE=examples
+script: ./build.sh $MODE
 
 # whitelist
 branches:

build.sh

@@ -1,7 +1,50 @@
-#!/bin/sh
-xctool \
-    -workspace AsyncDisplayKit.xcworkspace \
-    -scheme AsyncDisplayKit \
-    -sdk iphonesimulator8.1 \
-    -destination "platform=iOS Simulator,OS=${1},name=iPhone 5" \
-    build test
+#!/bin/bash
+
+# **** Update me when new Xcode versions are released! ****
+PLATFORM="platform=iOS Simulator,OS=8.1,name=iPhone 6"
+SDK="iphonesimulator8.1"
+
+
+# It is pitch black.
+set -e
+function trap_handler() {
+    echo -e "\n\nOh no! You walked directly into the slavering fangs of a lurking grue!"
+    echo "**** You have died ****"
+    exit 255
+}
+trap trap_handler INT TERM EXIT
+
+
+MODE="$1"
+
+if [ "$MODE" = "tests" ]; then
+    echo "Building & testing AsyncDisplayKit."
+    pod install
+    xctool \
+        -workspace AsyncDisplayKit.xcworkspace \
+        -scheme AsyncDisplayKit \
+        -sdk "$SDK" \
+        -destination "$PLATFORM" \
+        build test
+    trap - EXIT
+    exit 0
+fi
+
+if [ "$MODE" = "examples" ]; then
+    echo "Verifying that all AsyncDisplayKit examples compile."
+
+    for example in examples/*/; do
+        echo "Building $example."
+        pod install --project-directory=$example
+        xctool \
+            -workspace "${example}Sample.xcworkspace" \
+            -scheme Sample \
+            -sdk "$SDK" \
+            -destination "$PLATFORM" \
+            build
+    done
+    trap - EXIT
+    exit 0
+fi
+
+echo "Unrecognised mode '$MODE'."