From 581fc7d006b998f43da04569cbc19e24bfc679f2 Mon Sep 17 00:00:00 2001
From: Brenden Blanco <bblanco@plumgrid.com>
Date: Tue, 19 Apr 2016 11:42:49 -0700
Subject: [PATCH] Add ctest for style, using clang-format

When user touches a file, that file will be fed to `git clang-format`,
and if the tool reports a new diff it will consider the test failed. The
files to check will be anything in the current workspace compared to
origin/master.
---
 scripts/git-clang-format |  2 +-
 scripts/style-check.sh   | 25 +++++++++++++++++++++++++
 tests/CMakeLists.txt     |  2 ++
 3 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100755 scripts/style-check.sh

diff --git a/scripts/git-clang-format b/scripts/git-clang-format
index 359c836..74310b7 100755
--- a/scripts/git-clang-format
+++ b/scripts/git-clang-format
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 #===- git-clang-format - ClangFormat Git Integration ---------*- python -*--===#
 #
diff --git a/scripts/style-check.sh b/scripts/style-check.sh
new file mode 100755
index 0000000..1e90b16
--- /dev/null
+++ b/scripts/style-check.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# Runs clang-format on the files changed between HEAD and $1, which defaults to
+# origin/master.
+
+# to pick up git-clang-format from scripts/
+export PATH=$(dirname $0):$PATH
+
+CLANG_FORMAT=${CLANG_FORMAT:-clang-format}
+GITREF=${1:-origin/master}
+
+if ! hash $CLANG_FORMAT 2> /dev/null; then
+  echo "Could not find clang-format tool" 1>&2
+  exit 1
+fi
+
+n=$(git clang-format $GITREF --binary $CLANG_FORMAT --style llvm --diff --quiet | wc -l)
+if [ $n -gt 0 ]; then
+  echo "git clang-format $GITREF --binary $CLANG_FORMAT --style llvm --diff"
+  echo
+  git clang-format $GITREF --binary $CLANG_FORMAT --style llvm --diff
+  echo
+  echo "clang-format returned non-empty diff, please fixup the style" 1>&2
+  exit 1
+fi
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index ed9fdae..9051f89 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -4,6 +4,8 @@ configure_file(wrapper.sh.in "${CMAKE_CURRENT_BINARY_DIR}/wrapper.sh" @ONLY)
 
 set(TEST_WRAPPER ${CMAKE_CURRENT_BINARY_DIR}/wrapper.sh)
 
+add_test(NAME style-check COMMAND ${CMAKE_SOURCE_DIR}/scripts/style-check.sh)
+
 add_subdirectory(cc)
 add_subdirectory(python)
 add_subdirectory(lua)
-- 
2.7.4