Check the code format before commit (vesoft-inc#17)

* Check the code format before commit.

* Only check the staged content.

Co-authored-by: Shylock Hg <33566796+Shylock-Hg@users.noreply.github.com>

.linters/cpp/hooks/pre-commit.sh

@@ -50,10 +50,17 @@ python3 $CPPLINT --quiet --extensions=$CPPLINT_EXTENS \
                 --filter=$CPPLINT_FILTER --linelength=100 $CHECK_FILES 2>&1
 
 result=$?
-if [ $result -eq 0 ]
-then
-    exit 0
-else
+if [ ! $result -eq 0 ]; then
     echo "cpplint code style check failed, please fix and recommit."
     exit 1
 fi
+
+echo "Performing C++ code format check..."
+
+CLANG_HOME=/opt/vesoft/toolset/clang/10.0.0/
+res=$(git diff -U0 --no-color --staged | $CLANG_HOME/share/clang/clang-format-diff.py -p1 -binary $CLANG_HOME/bin/clang-format)
+if [[ ! -z $res ]]; then
+    echo "The code format is not well..."
+    echo $res
+    exit 1
+fi