color.h

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// Formatting library for C++ - color support
//
// Copyright (c) 2018 - present, Victor Zverovich and fmt contributors
// All rights reserved.
//
// For the license information refer to format.h.
 
#ifndef FMT_COLOR_H_
#define FMT_COLOR_H_
 
#include "format.h"
 
FMT_BEGIN_NAMESPACE
FMT_MODULE_EXPORT_BEGIN
 
enum class color : uint32_t
{
    alice_blue              = 0xF0F8FF, // rgb(240,248,255)
    antique_white           = 0xFAEBD7, // rgb(250,235,215)
    aqua                    = 0x00FFFF, // rgb(0,255,255)
    aquamarine              = 0x7FFFD4, // rgb(127,255,212)
    azure                   = 0xF0FFFF, // rgb(240,255,255)
    beige                   = 0xF5F5DC, // rgb(245,245,220)
    bisque                  = 0xFFE4C4, // rgb(255,228,196)
    black                   = 0x000000, // rgb(0,0,0)
    blanched_almond         = 0xFFEBCD, // rgb(255,235,205)
    blue                    = 0x0000FF, // rgb(0,0,255)
    blue_violet             = 0x8A2BE2, // rgb(138,43,226)
    brown                   = 0xA52A2A, // rgb(165,42,42)
    burly_wood              = 0xDEB887, // rgb(222,184,135)
    cadet_blue              = 0x5F9EA0, // rgb(95,158,160)
    chartreuse              = 0x7FFF00, // rgb(127,255,0)
    chocolate               = 0xD2691E, // rgb(210,105,30)
    coral                   = 0xFF7F50, // rgb(255,127,80)
    cornflower_blue         = 0x6495ED, // rgb(100,149,237)
    cornsilk                = 0xFFF8DC, // rgb(255,248,220)
    crimson                 = 0xDC143C, // rgb(220,20,60)
    cyan                    = 0x00FFFF, // rgb(0,255,255)
    dark_blue               = 0x00008B, // rgb(0,0,139)
    dark_cyan               = 0x008B8B, // rgb(0,139,139)
    dark_golden_rod         = 0xB8860B, // rgb(184,134,11)
    dark_gray               = 0xA9A9A9, // rgb(169,169,169)
    dark_green              = 0x006400, // rgb(0,100,0)
    dark_khaki              = 0xBDB76B, // rgb(189,183,107)
    dark_magenta            = 0x8B008B, // rgb(139,0,139)
    dark_olive_green        = 0x556B2F, // rgb(85,107,47)
    dark_orange             = 0xFF8C00, // rgb(255,140,0)
    dark_orchid             = 0x9932CC, // rgb(153,50,204)
    dark_red                = 0x8B0000, // rgb(139,0,0)
    dark_salmon             = 0xE9967A, // rgb(233,150,122)
    dark_sea_green          = 0x8FBC8F, // rgb(143,188,143)
    dark_slate_blue         = 0x483D8B, // rgb(72,61,139)
    dark_slate_gray         = 0x2F4F4F, // rgb(47,79,79)
    dark_turquoise          = 0x00CED1, // rgb(0,206,209)
    dark_violet             = 0x9400D3, // rgb(148,0,211)
    deep_pink               = 0xFF1493, // rgb(255,20,147)
    deep_sky_blue           = 0x00BFFF, // rgb(0,191,255)
    dim_gray                = 0x696969, // rgb(105,105,105)
    dodger_blue             = 0x1E90FF, // rgb(30,144,255)
    fire_brick              = 0xB22222, // rgb(178,34,34)
    floral_white            = 0xFFFAF0, // rgb(255,250,240)
    forest_green            = 0x228B22, // rgb(34,139,34)
    fuchsia                 = 0xFF00FF, // rgb(255,0,255)
    gainsboro               = 0xDCDCDC, // rgb(220,220,220)
    ghost_white             = 0xF8F8FF, // rgb(248,248,255)
    gold                    = 0xFFD700, // rgb(255,215,0)
    golden_rod              = 0xDAA520, // rgb(218,165,32)
    gray                    = 0x808080, // rgb(128,128,128)
    green                   = 0x008000, // rgb(0,128,0)
    green_yellow            = 0xADFF2F, // rgb(173,255,47)
    honey_dew               = 0xF0FFF0, // rgb(240,255,240)
    hot_pink                = 0xFF69B4, // rgb(255,105,180)
    indian_red              = 0xCD5C5C, // rgb(205,92,92)
    indigo                  = 0x4B0082, // rgb(75,0,130)
    ivory                   = 0xFFFFF0, // rgb(255,255,240)
    khaki                   = 0xF0E68C, // rgb(240,230,140)
    lavender                = 0xE6E6FA, // rgb(230,230,250)
    lavender_blush          = 0xFFF0F5, // rgb(255,240,245)
    lawn_green              = 0x7CFC00, // rgb(124,252,0)
    lemon_chiffon           = 0xFFFACD, // rgb(255,250,205)
    light_blue              = 0xADD8E6, // rgb(173,216,230)
    light_coral             = 0xF08080, // rgb(240,128,128)
    light_cyan              = 0xE0FFFF, // rgb(224,255,255)
    light_golden_rod_yellow = 0xFAFAD2, // rgb(250,250,210)
    light_gray              = 0xD3D3D3, // rgb(211,211,211)
    light_green             = 0x90EE90, // rgb(144,238,144)
    light_pink              = 0xFFB6C1, // rgb(255,182,193)
    light_salmon            = 0xFFA07A, // rgb(255,160,122)
    light_sea_green         = 0x20B2AA, // rgb(32,178,170)
    light_sky_blue          = 0x87CEFA, // rgb(135,206,250)
    light_slate_gray        = 0x778899, // rgb(119,136,153)
    light_steel_blue        = 0xB0C4DE, // rgb(176,196,222)
    light_yellow            = 0xFFFFE0, // rgb(255,255,224)
    lime                    = 0x00FF00, // rgb(0,255,0)
    lime_green              = 0x32CD32, // rgb(50,205,50)
    linen                   = 0xFAF0E6, // rgb(250,240,230)
    magenta                 = 0xFF00FF, // rgb(255,0,255)
    maroon                  = 0x800000, // rgb(128,0,0)
    medium_aquamarine       = 0x66CDAA, // rgb(102,205,170)
    medium_blue             = 0x0000CD, // rgb(0,0,205)
    medium_orchid           = 0xBA55D3, // rgb(186,85,211)
    medium_purple           = 0x9370DB, // rgb(147,112,219)
    medium_sea_green        = 0x3CB371, // rgb(60,179,113)
    medium_slate_blue       = 0x7B68EE, // rgb(123,104,238)
    medium_spring_green     = 0x00FA9A, // rgb(0,250,154)
    medium_turquoise        = 0x48D1CC, // rgb(72,209,204)
    medium_violet_red       = 0xC71585, // rgb(199,21,133)
    midnight_blue           = 0x191970, // rgb(25,25,112)
    mint_cream              = 0xF5FFFA, // rgb(245,255,250)
    misty_rose              = 0xFFE4E1, // rgb(255,228,225)
    moccasin                = 0xFFE4B5, // rgb(255,228,181)
    navajo_white            = 0xFFDEAD, // rgb(255,222,173)
    navy                    = 0x000080, // rgb(0,0,128)
    old_lace                = 0xFDF5E6, // rgb(253,245,230)
    olive                   = 0x808000, // rgb(128,128,0)
    olive_drab              = 0x6B8E23, // rgb(107,142,35)
    orange                  = 0xFFA500, // rgb(255,165,0)
    orange_red              = 0xFF4500, // rgb(255,69,0)
    orchid                  = 0xDA70D6, // rgb(218,112,214)
    pale_golden_rod         = 0xEEE8AA, // rgb(238,232,170)
    pale_green              = 0x98FB98, // rgb(152,251,152)
    pale_turquoise          = 0xAFEEEE, // rgb(175,238,238)
    pale_violet_red         = 0xDB7093, // rgb(219,112,147)
    papaya_whip             = 0xFFEFD5, // rgb(255,239,213)
    peach_puff              = 0xFFDAB9, // rgb(255,218,185)
    peru                    = 0xCD853F, // rgb(205,133,63)
    pink                    = 0xFFC0CB, // rgb(255,192,203)
    plum                    = 0xDDA0DD, // rgb(221,160,221)
    powder_blue             = 0xB0E0E6, // rgb(176,224,230)
    purple                  = 0x800080, // rgb(128,0,128)
    rebecca_purple          = 0x663399, // rgb(102,51,153)
    red                     = 0xFF0000, // rgb(255,0,0)
    rosy_brown              = 0xBC8F8F, // rgb(188,143,143)
    royal_blue              = 0x4169E1, // rgb(65,105,225)
    saddle_brown            = 0x8B4513, // rgb(139,69,19)
    salmon                  = 0xFA8072, // rgb(250,128,114)
    sandy_brown             = 0xF4A460, // rgb(244,164,96)
    sea_green               = 0x2E8B57, // rgb(46,139,87)
    sea_shell               = 0xFFF5EE, // rgb(255,245,238)
    sienna                  = 0xA0522D, // rgb(160,82,45)
    silver                  = 0xC0C0C0, // rgb(192,192,192)
    sky_blue                = 0x87CEEB, // rgb(135,206,235)
    slate_blue              = 0x6A5ACD, // rgb(106,90,205)
    slate_gray              = 0x708090, // rgb(112,128,144)
    snow                    = 0xFFFAFA, // rgb(255,250,250)
    spring_green            = 0x00FF7F, // rgb(0,255,127)
    steel_blue              = 0x4682B4, // rgb(70,130,180)
    tan                     = 0xD2B48C, // rgb(210,180,140)
    teal                    = 0x008080, // rgb(0,128,128)
    thistle                 = 0xD8BFD8, // rgb(216,191,216)
    tomato                  = 0xFF6347, // rgb(255,99,71)
    turquoise               = 0x40E0D0, // rgb(64,224,208)
    violet                  = 0xEE82EE, // rgb(238,130,238)
    wheat                   = 0xF5DEB3, // rgb(245,222,179)
    white                   = 0xFFFFFF, // rgb(255,255,255)
    white_smoke             = 0xF5F5F5, // rgb(245,245,245)
    yellow                  = 0xFFFF00, // rgb(255,255,0)
    yellow_green            = 0x9ACD32  // rgb(154,205,50)
}; // enum class color
 
enum class terminal_color : uint8_t
{
    black = 30,
    red,
    green,
    yellow,
    blue,
    magenta,
    cyan,
    white,
    bright_black = 90,
    bright_red,
    bright_green,
    bright_yellow,
    bright_blue,
    bright_magenta,
    bright_cyan,
    bright_white
};
 
enum class emphasis : uint8_t
{
    bold          = 1,
    faint         = 1 << 1,
    italic        = 1 << 2,
    underline     = 1 << 3,
    blink         = 1 << 4,
    reverse       = 1 << 5,
    conceal       = 1 << 6,
    strikethrough = 1 << 7,
};
 
// rgb is a struct for red, green and blue colors.
// Using the name "rgb" makes some editors show the color in a tooltip.
struct rgb
{
    FMT_CONSTEXPR rgb()
        : r(0), g(0), b(0)
    {
    }
    FMT_CONSTEXPR rgb(uint8_t r_, uint8_t g_, uint8_t b_)
        : r(r_), g(g_), b(b_)
    {
    }
    FMT_CONSTEXPR rgb(uint32_t hex)
        : r((hex >> 16) & 0xFF), g((hex >> 8) & 0xFF), b(hex & 0xFF)
    {
    }
    FMT_CONSTEXPR rgb(color hex)
        : r((uint32_t(hex) >> 16) & 0xFF),
          g((uint32_t(hex) >> 8) & 0xFF),
          b(uint32_t(hex) & 0xFF)
    {
    }
    uint8_t r;
    uint8_t g;
    uint8_t b;
};
 
FMT_BEGIN_DETAIL_NAMESPACE
 
// color is a struct of either a rgb color or a terminal color.
struct color_type
{
    FMT_CONSTEXPR color_type() noexcept
        : is_rgb(), value{}
    {
    }
    FMT_CONSTEXPR color_type(color rgb_color) noexcept
        : is_rgb(true), value{}
    {
        value.rgb_color = static_cast<uint32_t>(rgb_color);
    }
    FMT_CONSTEXPR color_type(rgb rgb_color) noexcept
        : is_rgb(true), value{}
    {
        value.rgb_color = (static_cast<uint32_t>(rgb_color.r) << 16) |
                          (static_cast<uint32_t>(rgb_color.g) << 8) | rgb_color.b;
    }
    FMT_CONSTEXPR color_type(terminal_color term_color) noexcept
        : is_rgb(), value{}
    {
        value.term_color = static_cast<uint8_t>(term_color);
    }
    bool is_rgb;
    union color_union {
        uint8_t  term_color;
        uint32_t rgb_color;
    } value;
};
 
FMT_END_DETAIL_NAMESPACE
 
class text_style
{
public:
    FMT_CONSTEXPR text_style(emphasis em = emphasis()) noexcept
        : set_foreground_color(), set_background_color(), ems(em)
    {
    }
 
    FMT_CONSTEXPR text_style& operator|=(const text_style& rhs)
    {
        if (!set_foreground_color)
        {
            set_foreground_color = rhs.set_foreground_color;
            foreground_color     = rhs.foreground_color;
        }
        else if (rhs.set_foreground_color)
        {
            if (!foreground_color.is_rgb || !rhs.foreground_color.is_rgb)
                FMT_THROW(format_error("can't OR a terminal color"));
            foreground_color.value.rgb_color |= rhs.foreground_color.value.rgb_color;
        }
 
        if (!set_background_color)
        {
            set_background_color = rhs.set_background_color;
            background_color     = rhs.background_color;
        }
        else if (rhs.set_background_color)
        {
            if (!background_color.is_rgb || !rhs.background_color.is_rgb)
                FMT_THROW(format_error("can't OR a terminal color"));
            background_color.value.rgb_color |= rhs.background_color.value.rgb_color;
        }
 
        ems = static_cast<emphasis>(static_cast<uint8_t>(ems) |
                                    static_cast<uint8_t>(rhs.ems));
        return *this;
    }
 
    friend FMT_CONSTEXPR text_style operator|(text_style        lhs,
                                              const text_style& rhs)
    {
        return lhs |= rhs;
    }
 
    FMT_CONSTEXPR bool has_foreground() const noexcept
    {
        return set_foreground_color;
    }
    FMT_CONSTEXPR bool has_background() const noexcept
    {
        return set_background_color;
    }
    FMT_CONSTEXPR bool has_emphasis() const noexcept
    {
        return static_cast<uint8_t>(ems) != 0;
    }
    FMT_CONSTEXPR detail::color_type get_foreground() const noexcept
    {
        FMT_ASSERT(has_foreground(), "no foreground specified for this style");
        return foreground_color;
    }
    FMT_CONSTEXPR detail::color_type get_background() const noexcept
    {
        FMT_ASSERT(has_background(), "no background specified for this style");
        return background_color;
    }
    FMT_CONSTEXPR emphasis get_emphasis() const noexcept
    {
        FMT_ASSERT(has_emphasis(), "no emphasis specified for this style");
        return ems;
    }
 
private:
    FMT_CONSTEXPR text_style(bool               is_foreground,
                             detail::color_type text_color) noexcept
        : set_foreground_color(), set_background_color(), ems()
    {
        if (is_foreground)
        {
            foreground_color     = text_color;
            set_foreground_color = true;
        }
        else
        {
            background_color     = text_color;
            set_background_color = true;
        }
    }
 
    friend FMT_CONSTEXPR text_style fg(detail::color_type foreground) noexcept;
 
    friend FMT_CONSTEXPR text_style bg(detail::color_type background) noexcept;
 
    detail::color_type foreground_color;
    detail::color_type background_color;
    bool               set_foreground_color;
    bool               set_background_color;
    emphasis           ems;
};
 
FMT_CONSTEXPR inline text_style fg(detail::color_type foreground) noexcept
{
    return text_style(true, foreground);
}
 
FMT_CONSTEXPR inline text_style bg(detail::color_type background) noexcept
{
    return text_style(false, background);
}
 
FMT_CONSTEXPR inline text_style operator|(emphasis lhs, emphasis rhs) noexcept
{
    return text_style(lhs) | rhs;
}
 
FMT_BEGIN_DETAIL_NAMESPACE
 
template <typename Char>
struct ansi_color_escape
{
    FMT_CONSTEXPR ansi_color_escape(detail::color_type text_color,
                                    const char*        esc) noexcept
    {
        // If we have a terminal color, we need to output another escape code
        // sequence.
        if (!text_color.is_rgb)
        {
            bool     is_background = esc == string_view("\x1b[48;2;");
            uint32_t value         = text_color.value.term_color;
            // Background ASCII codes are the same as the foreground ones but with
            // 10 more.
            if (is_background)
                value += 10u;
 
            size_t index    = 0;
            buffer[index++] = static_cast<Char>('\x1b');
            buffer[index++] = static_cast<Char>('[');
 
            if (value >= 100u)
            {
                buffer[index++] = static_cast<Char>('1');
                value %= 100u;
            }
            buffer[index++] = static_cast<Char>('0' + value / 10u);
            buffer[index++] = static_cast<Char>('0' + value % 10u);
 
            buffer[index++] = static_cast<Char>('m');
            buffer[index++] = static_cast<Char>('\0');
            return;
        }
 
        for (int i = 0; i < 7; i++)
        {
            buffer[i] = static_cast<Char>(esc[i]);
        }
        rgb color(text_color.value.rgb_color);
        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 ansi_color_escape(emphasis em) noexcept
    {
        uint8_t em_codes[num_emphases] = {};
        if (has_emphasis(em, emphasis::bold))
            em_codes[0] = 1;
        if (has_emphasis(em, emphasis::faint))
            em_codes[1] = 2;
        if (has_emphasis(em, emphasis::italic))
            em_codes[2] = 3;
        if (has_emphasis(em, emphasis::underline))
            em_codes[3] = 4;
        if (has_emphasis(em, emphasis::blink))
            em_codes[4] = 5;
        if (has_emphasis(em, emphasis::reverse))
            em_codes[5] = 7;
        if (has_emphasis(em, emphasis::conceal))
            em_codes[6] = 8;
        if (has_emphasis(em, emphasis::strikethrough))
            em_codes[7] = 9;
 
        size_t index = 0;
        for (size_t i = 0; i < num_emphases; ++i)
        {
            if (!em_codes[i])
                continue;
            buffer[index++] = static_cast<Char>('\x1b');
            buffer[index++] = static_cast<Char>('[');
            buffer[index++] = static_cast<Char>('0' + em_codes[i]);
            buffer[index++] = static_cast<Char>('m');
        }
        buffer[index++] = static_cast<Char>(0);
    }
    FMT_CONSTEXPR operator const Char*() const noexcept
    {
        return buffer;
    }
 
    FMT_CONSTEXPR const Char* begin() const noexcept
    {
        return buffer;
    }
    FMT_CONSTEXPR_CHAR_TRAITS const Char* end() const noexcept
    {
        return buffer + std::char_traits<Char>::length(buffer);
    }
 
private:
    static constexpr size_t num_emphases = 8;
    Char                    buffer[7u + 3u * num_emphases + 1u];
 
    static FMT_CONSTEXPR void to_esc(uint8_t c, Char* out, char delimiter) 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);
    }
    static FMT_CONSTEXPR bool has_emphasis(emphasis em, emphasis mask) noexcept
    {
        return static_cast<uint8_t>(em) & static_cast<uint8_t>(mask);
    }
};
 
template <typename Char>
FMT_CONSTEXPR ansi_color_escape<Char> make_foreground_color(
    detail::color_type foreground) noexcept
{
    return ansi_color_escape<Char>(foreground, "\x1b[38;2;");
}
 
template <typename Char>
FMT_CONSTEXPR ansi_color_escape<Char> make_background_color(
    detail::color_type background) noexcept
{
    return ansi_color_escape<Char>(background, "\x1b[48;2;");
}
 
template <typename Char>
FMT_CONSTEXPR ansi_color_escape<Char> make_emphasis(emphasis em) noexcept
{
    return ansi_color_escape<Char>(em);
}
 
template <typename Char>
inline void fputs(const Char* chars, FILE* stream)
{
    int result = std::fputs(chars, stream);
    if (result < 0)
        FMT_THROW(system_error(errno, FMT_STRING("cannot write to file")));
}
 
template <>
inline void fputs<wchar_t>(const wchar_t* chars, FILE* stream)
{
    int result = std::fputws(chars, stream);
    if (result < 0)
        FMT_THROW(system_error(errno, FMT_STRING("cannot write to file")));
}
 
template <typename Char>
inline void reset_color(FILE* stream)
{
    fputs("\x1b[0m", stream);
}
 
template <>
inline void reset_color<wchar_t>(FILE* stream)
{
    fputs(L"\x1b[0m", stream);
}
 
template <typename Char>
inline void reset_color(buffer<Char>& buffer)
{
    auto reset_color = string_view("\x1b[0m");
    buffer.append(reset_color.begin(), reset_color.end());
}
 
template <typename T>
struct styled_arg
{
    const T&   value;
    text_style style;
};
 
template <typename Char>
void vformat_to(buffer<Char>& buf, const text_style& ts, basic_string_view<Char> format_str, basic_format_args<buffer_context<type_identity_t<Char>>> args)
{
    bool has_style = false;
    if (ts.has_emphasis())
    {
        has_style     = true;
        auto emphasis = detail::make_emphasis<Char>(ts.get_emphasis());
        buf.append(emphasis.begin(), emphasis.end());
    }
    if (ts.has_foreground())
    {
        has_style       = true;
        auto foreground = detail::make_foreground_color<Char>(ts.get_foreground());
        buf.append(foreground.begin(), foreground.end());
    }
    if (ts.has_background())
    {
        has_style       = true;
        auto background = detail::make_background_color<Char>(ts.get_background());
        buf.append(background.begin(), background.end());
    }
    detail::vformat_to(buf, format_str, args, {});
    if (has_style)
        detail::reset_color<Char>(buf);
}
 
FMT_END_DETAIL_NAMESPACE
 
template <typename S, typename Char = char_t<S>>
void vprint(std::FILE* f, const text_style& ts, const S& format, basic_format_args<buffer_context<type_identity_t<Char>>> args)
{
    basic_memory_buffer<Char> buf;
    detail::vformat_to(buf, ts, detail::to_string_view(format), args);
    if (detail::is_utf8())
    {
        detail::print(f, basic_string_view<Char>(buf.begin(), buf.size()));
    }
    else
    {
        buf.push_back(Char(0));
        detail::fputs(buf.data(), f);
    }
}
 
template <typename S, typename... Args, FMT_ENABLE_IF(detail::is_string<S>::value)>
void print(std::FILE* f, const text_style& ts, const S& format_str, const Args&... args)
{
    vprint(f, ts, format_str,
           fmt::make_format_args<buffer_context<char_t<S>>>(args...));
}
 
template <typename S, typename... Args, FMT_ENABLE_IF(detail::is_string<S>::value)>
void print(const text_style& ts, const S& format_str, const Args&... args)
{
    return print(stdout, ts, format_str, args...);
}
 
template <typename S, typename Char = char_t<S>>
inline std::basic_string<Char> vformat(
    const text_style& ts, const S& format_str, basic_format_args<buffer_context<type_identity_t<Char>>> args)
{
    basic_memory_buffer<Char> buf;
    detail::vformat_to(buf, ts, detail::to_string_view(format_str), args);
    return fmt::to_string(buf);
}
 
template <typename S, typename... Args, typename Char = char_t<S>>
inline std::basic_string<Char> format(const text_style& ts, const S& format_str, const Args&... args)
{
    return fmt::vformat(ts, detail::to_string_view(format_str),
                        fmt::make_format_args<buffer_context<Char>>(args...));
}
 
template <typename OutputIt, typename Char, FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value)>
OutputIt vformat_to(
    OutputIt out, const text_style& ts, basic_string_view<Char> format_str, basic_format_args<buffer_context<type_identity_t<Char>>> args)
{
    auto&& buf = detail::get_buffer<Char>(out);
    detail::vformat_to(buf, ts, format_str, args);
    return detail::get_iterator(buf);
}
 
template <typename OutputIt, typename S, typename... Args, bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value && detail::is_string<S>::value>
inline auto format_to(OutputIt out, const text_style& ts, const S& format_str, Args&&... args) ->
    typename std::enable_if<enable, OutputIt>::type
{
    return vformat_to(out, ts, detail::to_string_view(format_str),
                      fmt::make_format_args<buffer_context<char_t<S>>>(args...));
}
 
template <typename T, typename Char>
struct formatter<detail::styled_arg<T>, Char> : formatter<T, Char>
{
    template <typename FormatContext>
    auto format(const detail::styled_arg<T>& arg, FormatContext& ctx) const
        -> decltype(ctx.out())
    {
        const auto& ts    = arg.style;
        const auto& value = arg.value;
        auto        out   = ctx.out();
 
        bool has_style = false;
        if (ts.has_emphasis())
        {
            has_style     = true;
            auto emphasis = detail::make_emphasis<Char>(ts.get_emphasis());
            out           = std::copy(emphasis.begin(), emphasis.end(), out);
        }
        if (ts.has_foreground())
        {
            has_style = true;
            auto foreground =
                detail::make_foreground_color<Char>(ts.get_foreground());
            out = std::copy(foreground.begin(), foreground.end(), out);
        }
        if (ts.has_background())
        {
            has_style = true;
            auto background =
                detail::make_background_color<Char>(ts.get_background());
            out = std::copy(background.begin(), background.end(), out);
        }
        out = formatter<T, Char>::format(value, ctx);
        if (has_style)
        {
            auto reset_color = string_view("\x1b[0m");
            out              = std::copy(reset_color.begin(), reset_color.end(), out);
        }
        return out;
    }
};
 
template <typename T>
FMT_CONSTEXPR auto styled(const T& value, text_style ts)
    -> detail::styled_arg<remove_cvref_t<T>>
{
    return detail::styled_arg<remove_cvref_t<T>>{value, ts};
}
 
FMT_MODULE_EXPORT_END
FMT_END_NAMESPACE
 
#endif // FMT_COLOR_H_