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Add file stream support for stylized text printing. (#967)

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This commit is contained in:
Nicolas 2018-12-09 18:28:48 +01:00 committed by Victor Zverovich
parent f54f3d0fb7
commit 749276072f
2 changed files with 44 additions and 16 deletions
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56
include/fmt/color.h
View File

@ -423,26 +423,53 @@ template <>
inline void reset_color<wchar_t>(FILE *stream) FMT_NOEXCEPT {
fputs(internal::data::WRESET_COLOR, stream);
}
// The following specialiazation disables using std::FILE as a character type,
// which is needed because or else
// fmt::print(stderr, fmt::emphasis::bold, "");
// would take stderr (a std::FILE *) as the format string.
template <>
struct is_string<std::FILE *> : std::false_type {};
template <>
struct is_string<const std::FILE *> : std::false_type {};
} // namespace internal
template <
typename S, typename Char = typename internal::char_t<S>::type>
void vprint(const text_style &tf, const S &format,
void vprint(std::FILE *f, const text_style &ts, const S &format,
basic_format_args<typename buffer_context<Char>::type> args) {
if (tf.has_emphasis()) {
if (ts.has_emphasis()) {
internal::fputs<Char>(
internal::make_emphasis<Char>(tf.get_emphasis()), stdout);
internal::make_emphasis<Char>(ts.get_emphasis()), f);
}
if (tf.has_foreground()) {
if (ts.has_foreground()) {
internal::fputs<Char>(
internal::make_foreground_color<Char>(tf.get_foreground()), stdout);
internal::make_foreground_color<Char>(ts.get_foreground()), f);
}
if (tf.has_background()) {
if (ts.has_background()) {
internal::fputs<Char>(
internal::make_background_color<Char>(tf.get_background()), stdout);
internal::make_background_color<Char>(ts.get_background()), f);
}
vprint(format, args);
internal::reset_color<Char>(stdout);
vprint(f, format, args);
internal::reset_color<Char>(f);
}
/**
Formats a string and prints it to the specified file stream using ANSI
escape sequences to specify text formatting.
Example:
fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
"Elapsed time: {0:.2f} seconds", 1.23);
*/
template <typename String, typename... Args>
typename std::enable_if<internal::is_string<String>::value>::type print(
std::FILE *f, const text_style &ts, const String &format_str,
const Args &... args) {
internal::check_format_string<Args...>(format_str);
typedef typename internal::char_t<String>::type char_t;
typedef typename buffer_context<char_t>::type context_t;
format_arg_store<context_t, Args...> as{args...};
vprint(f, ts, format_str, basic_format_args<context_t>(as));
}
/**
@ -453,13 +480,10 @@ void vprint(const text_style &tf, const S &format,
"Elapsed time: {0:.2f} seconds", 1.23);
*/
template <typename String, typename... Args>
typename std::enable_if<internal::is_string<String>::value>::type
print(const text_style &tf, const String &format_str, const Args & ... args) {
internal::check_format_string<Args...>(format_str);
typedef typename internal::char_t<String>::type char_t;
typedef typename buffer_context<char_t>::type context_t;
format_arg_store<context_t, Args...> as{args...};
vprint(tf, format_str, basic_format_args<context_t>(as));
typename std::enable_if<internal::is_string<String>::value>::type print(
const text_style &ts, const String &format_str,
const Args &... args) {
return print(stdout, ts, format_str, args...);
}
#endif

4
test/format-impl-test.cc
View File

@ -228,4 +228,8 @@ TEST(ColorsTest, Colors) {
stdout,
fmt::print(fg(fmt::color::blue) | fmt::emphasis::bold, "blue/bold"),
"\x1b[1m\x1b[38;2;000;000;255mblue/bold\x1b[0m");
EXPECT_WRITE(stderr, fmt::print(stderr, fmt::emphasis::bold, "bold error"),
"\x1b[1mbold error\x1b[0m");
EXPECT_WRITE(stderr, fmt::print(stderr, fg(fmt::color::blue), "blue log"),
"\x1b[38;2;000;000;255mblue log\x1b[0m");
}