Enable pre-commit (#366)

.pre-commit-config.yaml

@@ -0,0 +1,39 @@
+# To use:
+#
+#     pre-commit run -a
+#
+# Or:
+#
+#     pre-commit install  # (runs every time you commit in git)
+#
+# To update this file:
+#
+#     pre-commit autoupdate
+#
+# See https://github.com/pre-commit/pre-commit
+
+repos:
+# Standard hooks
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v4.1.0
+  hooks:
+  - id: check-case-conflict
+  - id: check-docstring-first
+  - id: check-executables-have-shebangs
+  - id: check-merge-conflict
+  - id: check-symlinks
+  - id: check-yaml
+    args: ["--allow-multiple-documents"]
+  - id: debug-statements
+  - id: mixed-line-ending
+  - id: sort-simple-yaml
+  - id: file-contents-sorter
+  - id: trailing-whitespace
+    exclude: .*.(xml?)|(svg?)
+
+# C++ formatting
+- repo: https://github.com/pre-commit/mirrors-clang-format
+  rev: v13.0.1
+  hooks:
+  - id: clang-format
+    types_or: [c++, c]

include/boost/histogram/axis/variant.hpp

@@ -38,8 +38,9 @@ class variant : public iterator_mixin<variant<Ts...>> {
   template <class T>
   using requires_bounded_type = std::enable_if_t<is_bounded_type<T>::value>;
 
-  using metadata_type = std::remove_const_t<std::remove_reference_t<decltype(
-      traits::metadata(std::declval<std::remove_pointer_t<mp11::mp_first<variant>>>()))>>;
+  using metadata_type =
+      std::remove_const_t<std::remove_reference_t<decltype(traits::metadata(
+          std::declval<std::remove_pointer_t<mp11::mp_first<variant>>>()))>>;
 
 public:
   // cannot import ctors with using directive, it breaks gcc and msvc

include/boost/histogram/detail/axes.hpp

@@ -433,8 +433,9 @@ using has_non_inclusive_axis = mp11::mp_any_of<axis_types<Axes>, is_not_inclusiv
 
 template <class T>
 constexpr std::size_t type_score() {
-  return sizeof(T) *
-         (std::is_integral<T>::value ? 1 : std::is_floating_point<T>::value ? 10 : 100);
+  return sizeof(T) * (std::is_integral<T>::value         ? 1
+                      : std::is_floating_point<T>::value ? 10
+                                                         : 100);
 }
 
 // arbitrary ordering of types

test/boost_range_support_test.cpp

@@ -6,11 +6,11 @@
 
 #include <boost/core/lightweight_test.hpp>
 #include <boost/histogram/axis/integer.hpp>
-#include "throw_exception.hpp"
 #include <boost/histogram/histogram.hpp>
 #include <boost/histogram/make_histogram.hpp>
 #include <boost/range/adaptor/filtered.hpp>
 #include <boost/range/numeric.hpp>
+#include "throw_exception.hpp"
 
 using namespace boost::histogram;
 using namespace boost::adaptors;

test/boost_units_support_test.cpp

@@ -7,7 +7,6 @@
 #include <boost/core/lightweight_test.hpp>
 #include <boost/histogram/axis/ostream.hpp>
 #include <boost/histogram/axis/regular.hpp>
-#include "throw_exception.hpp"
 #include <boost/histogram/histogram.hpp>
 #include <boost/histogram/indexed.hpp>
 #include <boost/histogram/literals.hpp>
@@ -17,6 +16,7 @@
 #include <boost/units/systems/si/length.hpp>
 #include <limits>
 #include "is_close.hpp"
+#include "throw_exception.hpp"
 
 using namespace boost::histogram;
 using namespace boost::histogram::literals;