Final manual curation in preparation for global clang-formating

.clang-format

@@ -3,17 +3,36 @@
 # clang-format --style=llvm --dump-config
 BasedOnStyle: LLVM
 AccessModifierOffset: -4
+AllowShortLambdasOnASingleLine: true
 AlwaysBreakTemplateDeclarations: Yes
 BinPackArguments: false
 BinPackParameters: false
 BreakBeforeBinaryOperators: All
 BreakConstructorInitializers: BeforeColon
 ColumnLimit: 99
+CommentPragmas: 'NOLINT:.*|^ IWYU pragma:'
+IncludeBlocks: Regroup
 IndentCaseLabels: true
 IndentPPDirectives: AfterHash
 IndentWidth: 4
 Language: Cpp
 SpaceAfterCStyleCast: true
 Standard: Cpp11
+StatementMacros: ['PyObject_HEAD']
 TabWidth: 4
+IncludeCategories:
+  - Regex:           '<pybind11/.*'
+    Priority:        -1
+  - Regex:           'pybind11.h"$'
+    Priority:        1
+  - Regex:           '^".*/?detail/'
+    Priority:        1
+    SortPriority:    2
+  - Regex:           '^"'
+    Priority:        1
+    SortPriority:    3
+  - Regex:           '<[[:alnum:]._]+>'
+    Priority:        4
+  - Regex:           '.*'
+    Priority:        5
 ...

include/pybind11/buffer_info.h

@@ -44,10 +44,12 @@ struct buffer_info {
     void *ptr = nullptr;          // Pointer to the underlying storage
     ssize_t itemsize = 0;         // Size of individual items in bytes
     ssize_t size = 0;             // Total number of entries
-    std::string format;           // For homogeneous buffers, this should be set to format_descriptor<T>::format()
+    std::string format; // For homogeneous buffers, this should be set to
+                        // format_descriptor<T>::format()
     ssize_t ndim = 0;             // Number of dimensions
     std::vector<ssize_t> shape;   // Shape of the tensor (1 entry per dimension)
-    std::vector<ssize_t> strides; // Number of bytes between adjacent entries (for each per dimension)
+    std::vector<ssize_t> strides; // Number of bytes between adjacent entries
+                                  // (for each per dimension)
     bool readonly = false;        // flag to indicate if the underlying storage may be written to
 
     buffer_info() = default;

include/pybind11/cast.h

@@ -996,7 +996,9 @@ PYBIND11_NAMESPACE_BEGIN(detail)
 template <typename T, enable_if_t<!is_pyobject<T>::value, int>>
 object object_or_cast(T &&o) { return pybind11::cast(std::forward<T>(o)); }
 
-struct override_unused {}; // Placeholder type for the unneeded (and dead code) static variable in the PYBIND11_OVERRIDE_OVERRIDE macro
+// Placeholder type for the unneeded (and dead code) static variable in the
+// PYBIND11_OVERRIDE_OVERRIDE macro
+struct override_unused {};
 template <typename ret_type> using override_caster_t = conditional_t<
     cast_is_temporary_value_reference<ret_type>::value, make_caster<ret_type>, override_unused>;
 
@@ -1463,7 +1465,8 @@ handle type::handle_of() {
     }}
 
 /// Lets you pass a type containing a `,` through a macro parameter without needing a separate
-/// typedef, e.g.: `PYBIND11_OVERRIDE(PYBIND11_TYPE(ReturnType<A, B>), PYBIND11_TYPE(Parent<C, D>), f, arg)`
+/// typedef, e.g.:
+/// `PYBIND11_OVERRIDE(PYBIND11_TYPE(ReturnType<A, B>), PYBIND11_TYPE(Parent<C, D>), f, arg)`
 #define PYBIND11_TYPE(...) __VA_ARGS__
 
 PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)

include/pybind11/chrono.h

@@ -38,7 +38,8 @@ template <typename type> class duration_caster {
     using rep = typename type::rep;
     using period = typename type::period;
 
-    using days = std::chrono::duration<int_least32_t, std::ratio<86400>>; // signed 25 bits required by the standard.
+    // signed 25 bits required by the standard.
+    using days = std::chrono::duration<int_least32_t, std::ratio<86400>>;
 
     bool load(handle src, bool) {
         using namespace std::chrono;

include/pybind11/detail/common.h

@@ -42,8 +42,9 @@
 #    endif
 #  endif
 #elif defined(_MSC_VER) && __cplusplus == 199711L
-// MSVC sets _MSVC_LANG rather than __cplusplus (supposedly until the standard is fully implemented)
-// Unless you use the /Zc:__cplusplus flag on Visual Studio 2017 15.7 Preview 3 or newer
+// MSVC sets _MSVC_LANG rather than __cplusplus (supposedly until the standard is fully
+// implemented). Unless you use the /Zc:__cplusplus flag on Visual Studio 2017 15.7 Preview 3
+// or newer.
 #  if _MSVC_LANG >= 201402L
 #    define PYBIND11_CPP14
 #    if _MSVC_LANG > 201402L && _MSC_VER >= 1910
@@ -722,8 +723,8 @@ template <typename T, typename... Ts>
 constexpr int last(int i, int result, T v, Ts... vs) { return last(i + 1, v ? i : result, vs...); }
 PYBIND11_NAMESPACE_END(constexpr_impl)
 
-/// Return the index of the first type in Ts which satisfies Predicate<T>.  Returns sizeof...(Ts) if
-/// none match.
+/// Return the index of the first type in Ts which satisfies Predicate<T>.
+/// Returns sizeof...(Ts) if none match.
 template <template<typename> class Predicate, typename... Ts>
 constexpr int constexpr_first() { return constexpr_impl::first(0, Predicate<Ts>::value...); }
 
@@ -842,7 +843,9 @@ PYBIND11_NAMESPACE_END(detail)
 
 #if defined(_MSC_VER)
 #  pragma warning(push)
-#  pragma warning(disable: 4275) // warning C4275: An exported class was derived from a class that wasn't exported. Can be ignored when derived from a STL class.
+#  pragma warning(disable: 4275)
+//     warning C4275: An exported class was derived from a class that wasn't exported.
+//     Can be ignored when derived from a STL class.
 #endif
 /// C++ bindings of builtin Python exceptions
 class PYBIND11_EXPORT_EXCEPTION builtin_exception : public std::runtime_error {
@@ -870,7 +873,9 @@ PYBIND11_RUNTIME_EXCEPTION(type_error, PyExc_TypeError)
 PYBIND11_RUNTIME_EXCEPTION(buffer_error, PyExc_BufferError)
 PYBIND11_RUNTIME_EXCEPTION(import_error, PyExc_ImportError)
 PYBIND11_RUNTIME_EXCEPTION(attribute_error, PyExc_AttributeError)
-PYBIND11_RUNTIME_EXCEPTION(cast_error, PyExc_RuntimeError) /// Thrown when pybind11::cast or handle::call fail due to a type casting error
+PYBIND11_RUNTIME_EXCEPTION(cast_error, PyExc_RuntimeError) /// Thrown when pybind11::cast or
+                                                           /// handle::call fail due to a type
+                                                           /// casting error
 PYBIND11_RUNTIME_EXCEPTION(reference_cast_error, PyExc_RuntimeError) /// Used internally
 
 [[noreturn]] PYBIND11_NOINLINE void pybind11_fail(const char *reason) { throw std::runtime_error(reason); }
@@ -974,13 +979,14 @@ class any_container {
     template <typename It, typename = enable_if_t<is_input_iterator<It>::value>>
     any_container(It first, It last) : v(first, last) { }
 
-    // Implicit conversion constructor from any arbitrary container type with values convertible to T
+    // Implicit conversion constructor from any arbitrary container type
+    // with values convertible to T
     template <typename Container, typename = enable_if_t<std::is_convertible<decltype(*std::begin(std::declval<const Container &>())), T>::value>>
     // NOLINTNEXTLINE(google-explicit-constructor)
     any_container(const Container &c) : any_container(std::begin(c), std::end(c)) { }
 
-    // initializer_list's aren't deducible, so don't get matched by the above template; we need this
-    // to explicitly allow implicit conversion from one:
+    // initializer_list's aren't deducible, so don't get matched by the above template;
+    // we need this to explicitly allow implicit conversion from one:
     template <typename TIn, typename = enable_if_t<std::is_convertible<TIn, T>::value>>
     any_container(const std::initializer_list<TIn> &c) : any_container(c.begin(), c.end()) { }
 

include/pybind11/detail/internals.h

@@ -147,18 +147,22 @@ struct override_hash {
 /// Whenever binary incompatible changes are made to this structure,
 /// `PYBIND11_INTERNALS_VERSION` must be incremented.
 struct internals {
-    type_map<type_info *> registered_types_cpp; // std::type_index -> pybind11's type information
-    std::unordered_map<PyTypeObject *, std::vector<type_info *>> registered_types_py; // PyTypeObject* -> base type_info(s)
+    // std::type_index -> pybind11's type information
+    type_map<type_info *> registered_types_cpp;
+    // PyTypeObject* -> base type_info(s)
+    std::unordered_map<PyTypeObject *, std::vector<type_info *>> registered_types_py;
     std::unordered_multimap<const void *, instance*> registered_instances; // void * -> instance*
     std::unordered_set<std::pair<const PyObject *, const char *>, override_hash> inactive_override_cache;
     type_map<std::vector<bool (*)(PyObject *, void *&)>> direct_conversions;
     std::unordered_map<const PyObject *, std::vector<PyObject *>> patients;
     std::forward_list<ExceptionTranslator> registered_exception_translators;
-    std::unordered_map<std::string, void *> shared_data; // Custom data to be shared across extensions
+    std::unordered_map<std::string, void *> shared_data; // Custom data to be shared across
+                                                         // extensions
 #if PYBIND11_INTERNALS_VERSION == 4
     std::vector<PyObject *> unused_loader_patient_stack_remove_at_v5;
 #endif
-    std::forward_list<std::string> static_strings; // Stores the std::strings backing detail::c_str()
+    std::forward_list<std::string> static_strings; // Stores the std::strings backing
+                                                   // detail::c_str()
     PyTypeObject *static_property_type;
     PyTypeObject *default_metaclass;
     PyObject *instance_base;

include/pybind11/detail/type_caster_base.h

@@ -426,7 +426,8 @@ PYBIND11_NOINLINE void instance::allocate_layout() {
             space += t->holder_size_in_ptrs; // holder instance
         }
         size_t flags_at = space;
-        space += size_in_ptrs(n_types); // status bytes (holder_constructed and instance_registered)
+        space += size_in_ptrs(n_types); // status bytes (holder_constructed and
+                                        // instance_registered)
 
         // Allocate space for flags, values, and holders, and initialize it to 0 (flags and values,
         // in particular, need to be 0).  Use Python's memory allocation functions: in Python 3.6

include/pybind11/iostream.h

@@ -164,7 +164,8 @@ PYBIND11_NAMESPACE_END(detail)
     .. code-block:: cpp
 
         {
-            py::scoped_ostream_redirect output{std::cerr, py::module::import("sys").attr("stderr")};
+            py::scoped_ostream_redirect output{
+                std::cerr, py::module::import("sys").attr("stderr")};
             std::cout << "Hello, World!";
         }
  \endrst */

include/pybind11/numpy.h

@@ -325,7 +325,8 @@ template <typename T, size_t N> struct array_info<T[N]> : array_info<std::array<
 template <typename T> using remove_all_extents_t = typename array_info<T>::type;
 
 template <typename T> using is_pod_struct = all_of<
-    std::is_standard_layout<T>,     // since we're accessing directly in memory we need a standard layout type
+    std::is_standard_layout<T>,     // since we're accessing directly in memory
+                                    // we need a standard layout type
 #if defined(__GLIBCXX__) && (__GLIBCXX__ < 20150422 || __GLIBCXX__ == 20150426 || __GLIBCXX__ == 20150623 || __GLIBCXX__ == 20150626 || __GLIBCXX__ == 20160803)
     // libstdc++ < 5 (including versions 4.8.5, 4.9.3 and 4.9.4 which were released after 5)
     // don't implement is_trivially_copyable, so approximate it

include/pybind11/options.h

@@ -51,7 +51,8 @@ class options {
 
     struct state {
         bool show_user_defined_docstrings = true;  //< Include user-supplied texts in docstrings.
-        bool show_function_signatures = true;      //< Include auto-generated function signatures in docstrings.
+        bool show_function_signatures = true;      //< Include auto-generated function signatures
+                                                   //  in docstrings.
     };
 
     static state &global_state() {