Remove size redundancy in enum_desc function declaration

The need to have the array size in the return type was redundant with
the actual list of elements.

src/buffer.hh

@@ -21,12 +21,12 @@ enum class EolFormat
     Crlf
 };
 
-constexpr Array<EnumDesc<EolFormat>, 2> enum_desc(Meta::Type<EolFormat>)
+constexpr auto enum_desc(Meta::Type<EolFormat>)
 {
-    return { {
+    return make_array<EnumDesc<EolFormat>>({
         { EolFormat::Lf, "lf" },
         { EolFormat::Crlf, "crlf" },
-    } };
+    });
 }
 
 enum class ByteOrderMark
@@ -35,12 +35,12 @@ enum class ByteOrderMark
     Utf8
 };
 
-constexpr Array<EnumDesc<ByteOrderMark>, 2> enum_desc(Meta::Type<ByteOrderMark>)
+constexpr auto enum_desc(Meta::Type<ByteOrderMark>)
 {
-    return { {
+    return make_array<EnumDesc<ByteOrderMark>>({
         { ByteOrderMark::None, "none" },
         { ByteOrderMark::Utf8, "utf8" },
-    } };
+    });
 }
 
 class Buffer;

src/client.hh

@@ -131,15 +131,15 @@ enum class Autoreload
     Ask
 };
 
-constexpr Array<EnumDesc<Autoreload>, 5> enum_desc(Meta::Type<Autoreload>)
+constexpr auto enum_desc(Meta::Type<Autoreload>)
 {
-    return { {
+    return make_array<EnumDesc<Autoreload>>({
         { Autoreload::Yes, "yes" },
         { Autoreload::No, "no" },
         { Autoreload::Ask, "ask" },
         { Autoreload::Yes, "true" },
         { Autoreload::No, "false" }
-    } };
+    });
 }
 
 }

src/input_handler.hh

@@ -136,13 +136,13 @@ enum class AutoInfo
 
 constexpr bool with_bit_ops(Meta::Type<AutoInfo>) { return true; }
 
-constexpr Array<EnumDesc<AutoInfo>, 3> enum_desc(Meta::Type<AutoInfo>)
+constexpr auto enum_desc(Meta::Type<AutoInfo>)
 {
-    return { {
+    return make_array<EnumDesc<AutoInfo>>({
         { AutoInfo::Command, "command"},
         { AutoInfo::OnKey, "onkey"},
         { AutoInfo::Normal, "normal" }
-    } };
+    });
 }
 
 bool show_auto_info_ifn(StringView title, StringView info, AutoInfo mask, const Context& context);

src/meta.hh

@@ -1,6 +1,8 @@
 #ifndef meta_hh_INCLUDED
 #define meta_hh_INCLUDED
 
+#include <utility>
+
 namespace Kakoune
 {
 inline namespace Meta
@@ -22,6 +24,20 @@ struct Array
     T m_data[N];
 };
 
+template<typename T, size_t N, size_t... Indices>
+constexpr Array<T, N> make_array(T (&&data)[N], std::index_sequence<Indices...>)
+{
+    static_assert(sizeof...(Indices) == N, "size mismatch");
+    return {{data[Indices]...}};
+}
+
+template<typename T, size_t N>
+constexpr Array<T, N> make_array(T (&&data)[N])
+{
+    return make_array(std::forward<decltype(data)>(data),
+                      std::make_index_sequence<N>());
+}
+
 }
 
 #endif // meta_hh_INCLUDED