style: adding clang-format as manual hook

Author: henryiii

.clang-format

@@ -0,0 +1,21 @@
+---
+# See all possible options and defaults with:
+# clang-format --style=llvm --dump-config
+BasedOnStyle: LLVM
+AccessModifierOffset: -4
+AlignConsecutiveAssignments: true
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: false
+BinPackParameters: false
+BreakBeforeBinaryOperators: All
+BreakConstructorInitializers: BeforeColon
+ColumnLimit: 99
+IndentCaseLabels: true
+IndentPPDirectives: AfterHash
+IndentWidth: 4
+Language: Cpp
+SpaceAfterCStyleCast: true
+# SpaceInEmptyBlock: true # too new
+Standard: Cpp11
+TabWidth: 4
+...

.pre-commit-config.yaml

@@ -98,3 +98,14 @@ repos:
     types:
     - c++
     entry: ./tools/check-style.sh
+
+  - id: docker-clang-format
+    stages: [manual]
+    name: Docker Clang Format
+    language: docker_image
+    types:
+    - c++
+    entry: unibeautify/clang-format:latest
+    args:
+    - -style=file
+    - -i

include/pybind11/iostream.h

@@ -104,8 +104,10 @@ PYBIND11_NAMESPACE_END(detail)
     .. code-block:: cpp
 
         {
-            py::scoped_ostream_redirect output{std::cerr, py::module_::import("sys").attr("stderr")};
-            std::cerr << "Hello, World!";
+            py::scoped_ostream_redirect output{
+                std::cerr,
+                py::module::import("sys").attr("stderr")
+            };
         }
  \endrst */
 class scoped_ostream_redirect {