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Parameterize 'printf(rgb color, ...)' and 'vprint_rgb(rgb color, ...)' on the type of the format string.

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Signed-off-by: Daniela Engert <dani@ngrt.de>
This commit is contained in:
Daniela Engert 2018-09-17 18:21:24 +02:00 committed by Victor Zverovich
parent d41be23acd
commit 73c53d7833
3 changed files with 99 additions and 44 deletions
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139
include/fmt/color.h
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@ -209,8 +209,85 @@ struct rgb {
uint8_t b;
};
void vprint_rgb(rgb fd, string_view format, format_args args);
void vprint_rgb(rgb fd, rgb bg, string_view format, format_args args);
namespace internal {
template <typename Char>
struct ansi_color_escape {
FMT_CONSTEXPR ansi_color_escape(rgb color, const char * esc) FMT_NOEXCEPT {
for (int i = 0; i < 7; i++) {
buffer[i] = static_cast<Char>(esc[i]);
}
to_esc(color.r, buffer + 7, ';');
to_esc(color.g, buffer + 11, ';');
to_esc(color.b, buffer + 15, 'm');
buffer[19] = static_cast<Char>(0);
}
FMT_CONSTEXPR operator const Char *() const FMT_NOEXCEPT { return buffer; }
private:
Char buffer[7 + 3 * 4 + 1];
static FMT_CONSTEXPR void to_esc(uint8_t c, Char *out, char delimiter) FMT_NOEXCEPT {
out[0] = static_cast<Char>('0' + c / 100);
out[1] = static_cast<Char>('0' + c / 10 % 10);
out[2] = static_cast<Char>('0' + c % 10);
out[3] = static_cast<Char>(delimiter);
}
};
template <typename Char>
FMT_CONSTEXPR ansi_color_escape<Char>
make_foreground_color(rgb color) FMT_NOEXCEPT {
return ansi_color_escape<Char>(color, internal::data::FOREGROUND_COLOR);
}
template <typename Char>
FMT_CONSTEXPR ansi_color_escape<Char>
make_background_color(rgb color) FMT_NOEXCEPT {
return ansi_color_escape<Char>(color, internal::data::BACKGROUND_COLOR);
}
template <typename Char>
inline void fputs(const Char *chars, FILE *stream) FMT_NOEXCEPT {
std::fputs(chars, stream);
}
template <>
inline void fputs<wchar_t>(const wchar_t *chars, FILE *stream) FMT_NOEXCEPT {
std::fputws(chars, stream);
}
template <typename Char>
inline void reset_color(FILE *stream) FMT_NOEXCEPT {
fputs(internal::data::RESET_COLOR, stream);
}
template <>
inline void reset_color<wchar_t>(FILE *stream) FMT_NOEXCEPT {
fputs(internal::data::WRESET_COLOR, stream);
}
} // namespace internal
template <
typename String,
typename Char = typename internal::format_string_traits<String>::char_type>
void vprint_rgb(rgb fd, const String &format,
basic_format_args<typename buffer_context<Char>::type> args) {
internal::fputs<Char>(internal::make_foreground_color<Char>(fd), stdout);
vprint(format, args);
internal::reset_color<Char>(stdout);
}
template <
typename String,
typename Char = typename internal::format_string_traits<String>::char_type>
void vprint_rgb(rgb fd, rgb bg, const String &format,
basic_format_args<typename buffer_context<Char>::type> args) {
internal::fputs<Char>(internal::make_foreground_color<Char>(fd), stdout);
internal::fputs<Char>(internal::make_background_color<Char>(bg), stdout);
vprint(format, args);
internal::reset_color<Char>(stdout);
}
/**
Formats a string and prints it to stdout using ANSI escape sequences to
@ -218,9 +295,14 @@ void vprint_rgb(rgb fd, rgb bg, string_view format, format_args args);
Example:
fmt::print(fmt::color::red, "Elapsed time: {0:.2f} seconds", 1.23);
*/
template <typename... Args>
inline void print(rgb fd, string_view format_str, const Args & ... args) {
vprint_rgb(fd, format_str, make_format_args(args...));
template <typename String, typename... Args>
typename std::enable_if<internal::is_format_string<String>::value>::type
print(rgb fd, const String &format_str, const Args & ... args) {
internal::check_format_string<Args...>(format_str);
typedef typename internal::format_string_traits<String>::char_type char_t;
typedef typename buffer_context<char_t>::type context_t;
format_arg_store<context_t, Args...> as{args...};
vprint_rgb(fd, format_str, basic_format_args<context_t>(as));
}
/**
@ -230,45 +312,14 @@ inline void print(rgb fd, string_view format_str, const Args & ... args) {
fmt::print(fmt::color::red, fmt::color::black,
"Elapsed time: {0:.2f} seconds", 1.23);
*/
template <typename... Args>
inline void print(rgb fd, rgb bg, string_view format_str,
const Args & ... args) {
vprint_rgb(fd, bg, format_str, make_format_args(args...));
}
namespace internal {
FMT_CONSTEXPR void to_esc(uint8_t c, char out[], int offset) {
out[offset + 0] = static_cast<char>('0' + c / 100);
out[offset + 1] = static_cast<char>('0' + c / 10 % 10);
out[offset + 2] = static_cast<char>('0' + c % 10);
}
} // namespace internal
inline void vprint_rgb(rgb fd, string_view format, format_args args) {
char escape_fd[] = "\x1b[38;2;000;000;000m";
internal::to_esc(fd.r, escape_fd, 7);
internal::to_esc(fd.g, escape_fd, 11);
internal::to_esc(fd.b, escape_fd, 15);
std::fputs(escape_fd, stdout);
vprint(format, args);
std::fputs(internal::data::RESET_COLOR, stdout);
}
inline void vprint_rgb(rgb fd, rgb bg, string_view format, format_args args) {
char escape_fd[] = "\x1b[38;2;000;000;000m"; // foreground color
char escape_bg[] = "\x1b[48;2;000;000;000m"; // background color
internal::to_esc(fd.r, escape_fd, 7);
internal::to_esc(fd.g, escape_fd, 11);
internal::to_esc(fd.b, escape_fd, 15);
internal::to_esc(bg.r, escape_bg, 7);
internal::to_esc(bg.g, escape_bg, 11);
internal::to_esc(bg.b, escape_bg, 15);
std::fputs(escape_fd, stdout);
std::fputs(escape_bg, stdout);
vprint(format, args);
std::fputs(internal::data::RESET_COLOR, stdout);
template <typename String, typename... Args>
typename std::enable_if<internal::is_format_string<String>::value>::type
print(rgb fd, rgb bg, const String &format_str, const Args & ... args) {
internal::check_format_string<Args...>(format_str);
typedef typename internal::format_string_traits<String>::char_type char_t;
typedef typename buffer_context<char_t>::type context_t;
format_arg_store<context_t, Args...> as{args...};
vprint_rgb(fd, bg, format_str, basic_format_args<context_t>(as));
}
#endif

2
include/fmt/format-inl.h
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@ -337,6 +337,8 @@ const int16_t basic_data<T>::POW10_EXPONENTS[] = {
827, 853, 880, 907, 933, 960, 986, 1013, 1039, 1066
};
template <typename T> const char basic_data<T>::FOREGROUND_COLOR[] = "\x1b[38;2;";
template <typename T> const char basic_data<T>::BACKGROUND_COLOR[] = "\x1b[48;2;";
template <typename T> const char basic_data<T>::RESET_COLOR[] = "\x1b[0m";
template <typename T> const wchar_t basic_data<T>::WRESET_COLOR[] = L"\x1b[0m";

2
include/fmt/format.h
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@ -888,6 +888,8 @@ struct FMT_API basic_data {
static const uint64_t POW10_SIGNIFICANDS[];
static const int16_t POW10_EXPONENTS[];
static const char DIGITS[];
static const char FOREGROUND_COLOR[];
static const char BACKGROUND_COLOR[];
static const char RESET_COLOR[];
static const wchar_t WRESET_COLOR[];
};