Setup - Add lint for cpp sources (#73)

__Major Revisions__

* add clang-format to lint cpp sources
* add cpp lint in GitHub Actions

.clang-format

+# Reference: https://clang.llvm.org/docs/ClangFormat.html
+
+BasedOnStyle: LLVM
+ColumnLimit: 120

.editorconfig

@@ -17,3 +17,6 @@ indent_size = 2
 [*.json]
 indent_size = 2
 insert_final_newline = false
+
+[{*.mk,Makefile}]
+indent_style = tab

.github/workflows/lint.yml

@@ -18,3 +18,15 @@ jobs:
     - name: Check spelling
       run: |
         misspell -error .
+  cpp:
+    name: CPP code lint
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Echo clang-format version
+      run: |
+        clang-format --version
+    - name: Lint
+      run: |
+        make cpplint

Makefile

+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+CPPSOURCES := $(shell find $(CURDIR) -regextype posix-extended -regex '.*\.(c|cpp|h|hpp|cc|cxx|cu)')
+
+.PHONY: cpplint cppformat
+
+cpplint:
+	clang-format --verbose --dry-run --Werror $(CPPSOURCES)
+
+cppformat:
+	clang-format --verbose -i $(CPPSOURCES)