Ensure git clang-format runs on PR

Author: Smit1603

.clang-format

@@ -1,2 +1,17 @@
 BasedOnStyle: LLVM
 
+Language: Cpp
+Standard: Cpp11
+PointerAlignment: Left
+
+IncludeCategories:
+  - Regex:           '^"[^/]+\"'
+    Priority:        10
+  - Regex:           '^"cling/'
+    Priority:        20
+  - Regex:           '^"clang/'
+    Priority:        30
+  - Regex:           '^"llvm/'
+    Priority:        40
+  - Regex:           '^<'
+    Priority:        50

.github/workflows/ci.yml

@@ -14,6 +14,37 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  precheckin:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout PR branch
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.7
+      - name: Install clang-format
+        run: |
+          curl https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+          echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main" | sudo tee -a /etc/apt/sources.list
+          sudo apt update
+          sudo apt install -y clang-format-15
+      - name: Download git-clang-format
+        run: |
+          wget https://raw.githubusercontent.com/llvm/llvm-project/main/clang/tools/clang-format/git-clang-format
+          chmod +x git-clang-format
+      - name: Run git-clang-format
+        run: |
+          git \
+          -c color.ui=always \
+          -c diff.wsErrorHighlight=all \
+          -c color.diff.whitespace='red reverse' \
+          clang-format-15 --diff --binary clang-format-15 origin/main -- include/ lib/ || \
+          (echo "Please run the following git-clang-format locally to fix the formatting: \n
+                git clang-format origin/main -- include/ lib/" && exit 1)
   build:
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}

lib/Interpreter/CppInterOp.cpp

@@ -2833,7 +2833,7 @@ namespace Cpp {
       (*wrapper)(This, /*nary=*/0, withFree);
       return;
     }
-    // FIXME: Diagnose.
   }
+  // FIXME: Diagnose.
 
   } // end namespace Cpp

unittests/CppInterOp/ScopeReflectionTest.cpp

@@ -694,7 +694,7 @@ TEST(ScopeReflectionTest, InstantiateNNTPClassTemplate) {
       enum { value = 1 };
     };)";
 
-  ASTContext &C = Interp->getCI()->getASTContext();
+  ASTContext& C = Interp->getCI()->getASTContext();
   GetAllTopLevelDecls(code, Decls);
 
   Cpp::TCppType_t IntTy = C.IntTy.getAsOpaquePtr();