Migrate Firebase off ObjC module @import statements (#992)

* Migrate Firebase off @import statements

* - Migrate tests and test utils from @import to #import.
  - Update Xcode projects for tests to explicitly link in framework deps.
  - Update check_no_module_imports.sh to look for @imports in tests/test utils/
    integration tests.

* Ensure check_no_module_imports.sh explicitly exits with code 0 on success.

1 files changed, 41 insertions, 0 deletions

diff --git a/scripts/check_no_module_imports.sh b/scripts/check_no_module_imports.sh
new file mode 100755
index 0000000..c00c1db
--- /dev/null
+++ b/scripts/check_no_module_imports.sh
@@ -0,0 +1,41 @@
+# Copyright 2018 Google
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Fail if any source files contain Objective-C module @imports, excluding:
+#   * Example sources
+#   * Sample sources
+
+options=(
+  -n  # show line numbers
+  -I  # exclude binary files
+  '^@import'
+)
+
+function exit_with_error {
+  echo "ERROR: @import statement found in the files above. Please use #import instead."
+  exit 1
+}
+
+git grep "${options[@]}" \
+  -- ':(exclude,glob)**/Example/**' ':(exclude,glob)**/Sample/**' && exit_with_error
+
+# Tests are under the Example directory, so we have to separately grep them for
+# @import statements (otherwise they'd be excluded).
+git grep "${options[@]}" \
+  -- ':(glob)**/Tests/**' ':(glob)**/TestUtils/**' ':(glob)**/IntegrationTests/**' && \
+  exit_with_error
+
+# We need to explicitly exit 0, since we expect `git grep` to return an error
+# if no @import calls are found.
+exit 0