Improve std::filesystem::path formatter.

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>

include/fmt/std.h

@@ -19,14 +19,9 @@
 #ifdef __cpp_lib_filesystem
 #  include <filesystem>
 
-template <>
-struct fmt::formatter<std::filesystem::path> : formatter<string_view> {
-  template <typename FormatContext>
-  auto format(const std::filesystem::path& p, FormatContext& ctx) const ->
-      typename FormatContext::iterator {
-    return formatter<string_view>::format(p.string(), ctx);
-  }
-};
+FMT_BEGIN_NAMESPACE
+template <> struct formatter<std::filesystem::path> : ostream_formatter {};
+FMT_END_NAMESPACE
 #endif
 
 FMT_BEGIN_NAMESPACE

test/std-test.cc

@@ -11,7 +11,7 @@
 
 TEST(std_test, path) {
 #ifdef __cpp_lib_filesystem
-  EXPECT_EQ(fmt::format("{:8}", std::filesystem::path("foo")), "foo     ");
+  EXPECT_EQ(fmt::format("{:8}", std::filesystem::path("foo")), "\"foo\"   ");
 #endif
 }