fmt support started

src/include/units/format.h

@@ -22,83 +22,17 @@
 
 #pragma once
 
-#include <units/unit.h>
-#include <ostream>
-#include <string_view>
+#include <units/quantity.h>
+#include <fmt/format.h>
 
-namespace units {
-
-  namespace detail {
-
-    template<typename Ratio, typename CharT, typename Traits>
-    void print_ratio(std::basic_ostream<CharT, Traits>& os)
-    {
-      if constexpr(Ratio::num != 1 || Ratio::den != 1) {
-        if constexpr(Ratio::den == 1) {
-          os << "[" << Ratio::num << "]";
-        }
-        else {
-          os << "[" << Ratio::num << "/" << Ratio::den << "]";
-        }
-      }
-    }
-
-    template<typename Ratio, typename PrefixType, typename CharT, typename Traits>
-    void print_prefix_or_ratio(std::basic_ostream<CharT, Traits>& os)
-    {
-      if constexpr(Ratio::num != 1 || Ratio::den != 1) {
-        if(!std::same_as<PrefixType, no_prefix>) {
-          using prefix = downcast_target<detail::prefix_base<PrefixType, Ratio>>;
-
-          if constexpr(!std::same_as<prefix, prefix_base<PrefixType, Ratio>>) {
-            // print as a prefixed unit
-            os << prefix::symbol;
-            return;
-          }
-        }
-        // print as a ratio of the coherent unit
-        print_ratio<Ratio>(os);
-      }
-    }
-
-    template<typename CharT, typename Traits, typename... Es>
-    void print_dimensions(std::basic_ostream<CharT, Traits>& os, dimension<Es...>)
-    {
-      bool first = true;
-      auto ingr_printer = [&]<typename E>(E) {
-        if constexpr(E::num < 0) {
-          os << (first ? "1/" : "/");
-        }
-        else {
-          os << (first ? "" : "⋅");
-        }
-        os << E::dimension::symbol;
-        if constexpr(E::den != 1) {
-          os << "^(" << abs(E::num) << "/" << E::den << ")";
-        }
-        else if constexpr(abs(E::num) != 1) {
-          // if constexpr(is_unicode<CharT>)
-          //   os << superscript<abs(E::num)>;
-          // else
-            os << "^" << abs(E::num);
-        }
-        first = false;
-      };
-      (ingr_printer(Es{}), ...);
-    }
+template<typename U, typename Rep, typename CharT>
+struct fmt::formatter<units::quantity<U, Rep>, CharT> {
+  template<typename ParseContext>
+  constexpr auto parse(ParseContext& ctx) { return ctx.begin(); }
 
+  template<typename FormatContext>
+  auto format(const units::quantity<U, Rep>& q, FormatContext& ctx)
+  {
+    return format_to(ctx.out(), "{:.1f}", q.count());
   }
-
-}  // namespace units
-
-// template<Unit U, Scalar Rep, typename CharT>
-// struct fmt::formatter<units::quantity<U, Rep>, CharT> {
-//   template<typename ParseContext>
-//   constexpr auto parse(ParseContext& ctx) { return ctx.begin(); }
-
-//   template<typename FormatContext>
-//   auto format(const units::quantity<U, Rep>& q, FormatContext& ctx)
-//   {
-//     return format_to(ctx.out(), "{:.1f}, {:.1f}", p.x, p.y);
-//   }
-// }
+};