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Add experimental emphasis support.

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This commit is contained in:
Nicolas Lesser 2018-12-04 11:44:28 +01:00
parent 77656c672c
commit b07b860bb9
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GPG Key ID: 55F9BC675F85A2DF
1 changed files with 97 additions and 0 deletions
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97
include/fmt/color.h
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@ -192,6 +192,11 @@ enum class color : uint32_t {
yellow_green = 0x9ACD32 // rgb(154,205,50)
}; // enum class color
enum class emphasis : uint8_t {
bold = 1,
underline = 4,
}; // enum class emphasis
// rgb is a struct for red, green and blue colors.
// We use rgb as name because some editors will show it as color direct in the
// editor.
@ -222,6 +227,13 @@ struct ansi_color_escape {
to_esc(color.b, buffer + 15, 'm');
buffer[19] = static_cast<Char>(0);
}
FMT_CONSTEXPR ansi_color_escape(emphasis em) FMT_NOEXCEPT {
buffer[0] = '\x1b';
buffer[1] = '[';
buffer[2] = '0' + (uint8_t)em;
buffer[3] = 'm';
buffer[4] = '\0';
}
FMT_CONSTEXPR operator const Char *() const FMT_NOEXCEPT { return buffer; }
private:
@ -247,6 +259,11 @@ make_background_color(rgb color) FMT_NOEXCEPT {
return ansi_color_escape<Char>(color, internal::data::BACKGROUND_COLOR);
}
template <typename Char>
FMT_CONSTEXPR ansi_color_escape<Char> make_emphasis(emphasis em) FMT_NOEXCEPT {
return ansi_color_escape<Char>(em);
}
template <typename Char>
inline void fputs(const Char *chars, FILE *stream) FMT_NOEXCEPT {
std::fputs(chars, stream);
@ -287,6 +304,36 @@ void vprint_rgb(rgb fd, rgb bg, const S &format,
internal::reset_color<Char>(stdout);
}
template <typename S, typename Char = typename internal::char_t<S>::type>
void vprint_emphasis(
emphasis em, const S &format,
basic_format_args<typename buffer_context<Char>::type> args) {
internal::fputs<Char>(internal::make_emphasis<Char>(em), stdout);
vprint(format, args);
internal::reset_color<Char>(stdout);
}
template <typename S, typename Char = typename internal::char_t<S>::type>
void vprint_emphasis(
emphasis em, rgb fd, const S &format,
basic_format_args<typename buffer_context<Char>::type> args) {
internal::fputs<Char>(internal::make_emphasis<Char>(em), stdout);
internal::fputs<Char>(internal::make_foreground_color<Char>(fd), stdout);
vprint(format, args);
internal::reset_color<Char>(stdout);
}
template <typename S, typename Char = typename internal::char_t<S>::type>
void vprint_emphasis(
emphasis em, rgb fd, rgb bg, const S &format,
basic_format_args<typename buffer_context<Char>::type> args) {
internal::fputs<Char>(internal::make_emphasis<Char>(em), stdout);
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
specify foreground color 'fd'.
@ -320,6 +367,56 @@ print(rgb fd, rgb bg, const String &format_str, const Args & ... args) {
vprint_rgb(fd, bg, format_str, basic_format_args<context_t>(as));
}
/**
Formats a string and prints it to stdout using ANSI escape sequences to
specify the text emphasis 'em'.
Example:
fmt::print(fmt::emphasis::bold, "Be careful!");
*/
template <typename String, typename... Args>
typename std::enable_if<internal::is_string<String>::value>::type print(
emphasis em, 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_emphasis(em, format_str, basic_format_args<context_t>(as));
}
/**
Formats a string and prints it to stdout using ANSI escape sequences to
specify the text emphasis 'em' and the foreground color 'fd'.
Example:
fmt::print(fmt::emphasis::bold, fmt::color::red, "Be careful!");
*/
template <typename String, typename... Args>
typename std::enable_if<internal::is_string<String>::value>::type print(
emphasis em, rgb fd, 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_emphasis(em, fd, format_str, basic_format_args<context_t>(as));
}
/**
Formats a string and prints it to stdout using ANSI escape sequences to
specify the text emphasis 'em', the foreground color 'fg' and the background
color 'bg'.
Example:
fmt::print(fmt::emphasis::bold, "Be careful!");
*/
template <typename String, typename... Args>
typename std::enable_if<internal::is_string<String>::value>::type print(
emphasis em, rgb fg, rgb bg, 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_emphasis(em, fg, bg, format_str, basic_format_args<context_t>(as));
}
#endif
FMT_END_NAMESPACE