Speed up source checks in Travis (#885)

* Factor out a whitespace checking script

* Factor out a copyright checking script

* Rewrite lint.sh to honor revision ranges

* Only restyle files that are part of the PR

* Run C++ lint before builds to fail faster

* Git grep doesn't operate on revision ranges

* style.sh accepts clang-format 6 or 7

1 files changed, 31 insertions, 0 deletions

diff --git a/scripts/check_copyright.sh b/scripts/check_copyright.sh
new file mode 100755
index 0000000..14857d3
--- /dev/null
+++ b/scripts/check_copyright.sh
@@ -0,0 +1,31 @@
+# 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.
+
+# Check source files for copyright notices
+
+options=(
+  -E  # Use extended regexps
+  -I  # Exclude binary files
+  -L  # Show files that don't have a match
+  'Copyright [0-9]{4}.*Google'
+)
+
+git grep "${options[@]}" \
+    -- '*.'{c,cc,h,m,mm,sh,swift} \
+    ':(exclude)**/third_party/**'
+if [[ $? == 0 ]]; then
+  echo "ERROR: Missing copyright notices in the files above. Please fix."
+  exit 1
+fi
+