style: Use clang-format

Author: henryiii

.clang-format

@@ -0,0 +1,19 @@
+---
+# See all possible options and defaults with:
+# clang-format --style=llvm --dump-config
+BasedOnStyle: LLVM
+AlignConsecutiveAssignments: true
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: false
+BinPackParameters: false
+BreakBeforeBinaryOperators: All
+BreakConstructorInitializers: BeforeComma
+ColumnLimit: 99
+IndentPPDirectives: AfterHash
+IndentWidth: 4
+Language: Cpp
+SpaceAfterCStyleCast: true
+# SpaceInEmptyBlock: true # too new
+Standard: Cpp11
+TabWidth: 4
+...

.pre-commit-config.yaml

@@ -26,3 +26,15 @@ repos:
   - id: flake8
     additional_dependencies: [flake8-bugbear]
     exclude: ^(docs/.*|tools/.*)$
+
+- repo: local
+  hooks:
+  - id: docker-clang-format
+    name: Docker Clang Format
+    language: docker_image
+    types:
+    - c++
+    entry: unibeautify/clang-format:latest
+    args:
+    - -style=file
+    - -i