Add pre-commit hook (#13)

Co-authored-by: Antonio Andelic <antonio.andelic@memgraph.io>

.githooks/pre-commit

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+project_folder=$(git rev-parse --show-toplevel)
+if git rev-parse --verify HEAD >/dev/null 2>&1
+then
+	against=HEAD
+else
+	# Initial commit: diff against an empty tree object
+	against=$(git hash-object -t tree /dev/null)
+fi
+
+# Redirect output to stderr.
+exec 1>&2
+
+tmpdir=$(mktemp -d repo-XXXXXXXX)
+trap "rm -rf $tmpdir" EXIT INT
+
+modified_files=$(git diff --cached --name-only --diff-filter=AM $against | sed -nE "/.*\.(cpp|cc|cxx|c|h|hpp|lcp)/p")
+for file in $modified_files; do
+  echo "Checking $file..."
+
+  cp $project_folder/.clang-format $project_folder/.clang-tidy $tmpdir
+
+  git checkout-index --prefix="$tmpdir/" -- $file
+
+  echo "Running clang-format..."
+  $project_folder/tools/git-clang-format $tmpdir/$file
+  code=$?
+
+  if [ $code -ne 0 ]; then
+    break
+  fi
+
+  echo "Running clang-tidy..."
+  $project_folder/tools/git-clang-tidy $tmpdir/$file
+  code=$?
+
+  if [ $code -ne 0 ]; then
+   break
+  fi
+done;
+
+return $code

init

@@ -195,3 +195,9 @@ setup_virtualenv tests/stress
 setup_virtualenv tests/integration/ldap
 
 echo "Done installing dependencies for Memgraph"
+
+echo "Linking git hooks"
+for hook in $(find $DIR/.githooks -type f -printf "%f\n"); do
+  ln -s -f "$DIR/.githooks/$hook" "$DIR/.git/hooks/$hook"
+  echo "Added $hook hook"
+done;

tools/git-clang-format

@@ -11,9 +11,13 @@ data = subprocess.run(
     ["clang-format", "--output-replacements-xml", sys.argv[1]],
     stdout=subprocess.PIPE, check=True).stdout.decode(
         "utf-8").strip().split("\n")
+has_error = False
 for row in data:
     match = re.match(
         r"^<replacement offset='([0-9]+)' length='([0-9]+)'>", row)
     if match:
+        has_error = True
         offset = int(match.group(1)) + int(match.group(2))
         print("warning:{}:{}".format(offset, MESSAGE))
+
+sys.exit(1 if has_error else 0)