1 // Formatting library for C++ - color support
2 //
3 // Copyright (c) 2018 - present, Victor Zverovich and fmt contributors
4 // All rights reserved.
5 //
6 // For the license information refer to format.h.
7
8 #ifndef FMT_COLOR_H_
9 #define FMT_COLOR_H_
10
11 #include "format.h"
12
13 FMT_BEGIN_NAMESPACE
14 FMT_BEGIN_EXPORT
15
16 enum class color : uint32_t {
17 alice_blue = 0xF0F8FF, // rgb(240,248,255)
18 antique_white = 0xFAEBD7, // rgb(250,235,215)
19 aqua = 0x00FFFF, // rgb(0,255,255)
20 aquamarine = 0x7FFFD4, // rgb(127,255,212)
21 azure = 0xF0FFFF, // rgb(240,255,255)
22 beige = 0xF5F5DC, // rgb(245,245,220)
23 bisque = 0xFFE4C4, // rgb(255,228,196)
24 black = 0x000000, // rgb(0,0,0)
25 blanched_almond = 0xFFEBCD, // rgb(255,235,205)
26 blue = 0x0000FF, // rgb(0,0,255)
27 blue_violet = 0x8A2BE2, // rgb(138,43,226)
28 brown = 0xA52A2A, // rgb(165,42,42)
29 burly_wood = 0xDEB887, // rgb(222,184,135)
30 cadet_blue = 0x5F9EA0, // rgb(95,158,160)
31 chartreuse = 0x7FFF00, // rgb(127,255,0)
32 chocolate = 0xD2691E, // rgb(210,105,30)
33 coral = 0xFF7F50, // rgb(255,127,80)
34 cornflower_blue = 0x6495ED, // rgb(100,149,237)
35 cornsilk = 0xFFF8DC, // rgb(255,248,220)
36 crimson = 0xDC143C, // rgb(220,20,60)
37 cyan = 0x00FFFF, // rgb(0,255,255)
38 dark_blue = 0x00008B, // rgb(0,0,139)
39 dark_cyan = 0x008B8B, // rgb(0,139,139)
40 dark_golden_rod = 0xB8860B, // rgb(184,134,11)
41 dark_gray = 0xA9A9A9, // rgb(169,169,169)
42 dark_green = 0x006400, // rgb(0,100,0)
43 dark_khaki = 0xBDB76B, // rgb(189,183,107)
44 dark_magenta = 0x8B008B, // rgb(139,0,139)
45 dark_olive_green = 0x556B2F, // rgb(85,107,47)
46 dark_orange = 0xFF8C00, // rgb(255,140,0)
47 dark_orchid = 0x9932CC, // rgb(153,50,204)
48 dark_red = 0x8B0000, // rgb(139,0,0)
49 dark_salmon = 0xE9967A, // rgb(233,150,122)
50 dark_sea_green = 0x8FBC8F, // rgb(143,188,143)
51 dark_slate_blue = 0x483D8B, // rgb(72,61,139)
52 dark_slate_gray = 0x2F4F4F, // rgb(47,79,79)
53 dark_turquoise = 0x00CED1, // rgb(0,206,209)
54 dark_violet = 0x9400D3, // rgb(148,0,211)
55 deep_pink = 0xFF1493, // rgb(255,20,147)
56 deep_sky_blue = 0x00BFFF, // rgb(0,191,255)
57 dim_gray = 0x696969, // rgb(105,105,105)
58 dodger_blue = 0x1E90FF, // rgb(30,144,255)
59 fire_brick = 0xB22222, // rgb(178,34,34)
60 floral_white = 0xFFFAF0, // rgb(255,250,240)
61 forest_green = 0x228B22, // rgb(34,139,34)
62 fuchsia = 0xFF00FF, // rgb(255,0,255)
63 gainsboro = 0xDCDCDC, // rgb(220,220,220)
64 ghost_white = 0xF8F8FF, // rgb(248,248,255)
65 gold = 0xFFD700, // rgb(255,215,0)
66 golden_rod = 0xDAA520, // rgb(218,165,32)
67 gray = 0x808080, // rgb(128,128,128)
68 green = 0x008000, // rgb(0,128,0)
69 green_yellow = 0xADFF2F, // rgb(173,255,47)
70 honey_dew = 0xF0FFF0, // rgb(240,255,240)
71 hot_pink = 0xFF69B4, // rgb(255,105,180)
72 indian_red = 0xCD5C5C, // rgb(205,92,92)
73 indigo = 0x4B0082, // rgb(75,0,130)
74 ivory = 0xFFFFF0, // rgb(255,255,240)
75 khaki = 0xF0E68C, // rgb(240,230,140)
76 lavender = 0xE6E6FA, // rgb(230,230,250)
77 lavender_blush = 0xFFF0F5, // rgb(255,240,245)
78 lawn_green = 0x7CFC00, // rgb(124,252,0)
79 lemon_chiffon = 0xFFFACD, // rgb(255,250,205)
80 light_blue = 0xADD8E6, // rgb(173,216,230)
81 light_coral = 0xF08080, // rgb(240,128,128)
82 light_cyan = 0xE0FFFF, // rgb(224,255,255)
83 light_golden_rod_yellow = 0xFAFAD2, // rgb(250,250,210)
84 light_gray = 0xD3D3D3, // rgb(211,211,211)
85 light_green = 0x90EE90, // rgb(144,238,144)
86 light_pink = 0xFFB6C1, // rgb(255,182,193)
87 light_salmon = 0xFFA07A, // rgb(255,160,122)
88 light_sea_green = 0x20B2AA, // rgb(32,178,170)
89 light_sky_blue = 0x87CEFA, // rgb(135,206,250)
90 light_slate_gray = 0x778899, // rgb(119,136,153)
91 light_steel_blue = 0xB0C4DE, // rgb(176,196,222)
92 light_yellow = 0xFFFFE0, // rgb(255,255,224)
93 lime = 0x00FF00, // rgb(0,255,0)
94 lime_green = 0x32CD32, // rgb(50,205,50)
95 linen = 0xFAF0E6, // rgb(250,240,230)
96 magenta = 0xFF00FF, // rgb(255,0,255)
97 maroon = 0x800000, // rgb(128,0,0)
98 medium_aquamarine = 0x66CDAA, // rgb(102,205,170)
99 medium_blue = 0x0000CD, // rgb(0,0,205)
100 medium_orchid = 0xBA55D3, // rgb(186,85,211)
101 medium_purple = 0x9370DB, // rgb(147,112,219)
102 medium_sea_green = 0x3CB371, // rgb(60,179,113)
103 medium_slate_blue = 0x7B68EE, // rgb(123,104,238)
104 medium_spring_green = 0x00FA9A, // rgb(0,250,154)
105 medium_turquoise = 0x48D1CC, // rgb(72,209,204)
106 medium_violet_red = 0xC71585, // rgb(199,21,133)
107 midnight_blue = 0x191970, // rgb(25,25,112)
108 mint_cream = 0xF5FFFA, // rgb(245,255,250)
109 misty_rose = 0xFFE4E1, // rgb(255,228,225)
110 moccasin = 0xFFE4B5, // rgb(255,228,181)
111 navajo_white = 0xFFDEAD, // rgb(255,222,173)
112 navy = 0x000080, // rgb(0,0,128)
113 old_lace = 0xFDF5E6, // rgb(253,245,230)
114 olive = 0x808000, // rgb(128,128,0)
115 olive_drab = 0x6B8E23, // rgb(107,142,35)
116 orange = 0xFFA500, // rgb(255,165,0)
117 orange_red = 0xFF4500, // rgb(255,69,0)
118 orchid = 0xDA70D6, // rgb(218,112,214)
119 pale_golden_rod = 0xEEE8AA, // rgb(238,232,170)
120 pale_green = 0x98FB98, // rgb(152,251,152)
121 pale_turquoise = 0xAFEEEE, // rgb(175,238,238)
122 pale_violet_red = 0xDB7093, // rgb(219,112,147)
123 papaya_whip = 0xFFEFD5, // rgb(255,239,213)
124 peach_puff = 0xFFDAB9, // rgb(255,218,185)
125 peru = 0xCD853F, // rgb(205,133,63)
126 pink = 0xFFC0CB, // rgb(255,192,203)
127 plum = 0xDDA0DD, // rgb(221,160,221)
128 powder_blue = 0xB0E0E6, // rgb(176,224,230)
129 purple = 0x800080, // rgb(128,0,128)
130 rebecca_purple = 0x663399, // rgb(102,51,153)
131 red = 0xFF0000, // rgb(255,0,0)
132 rosy_brown = 0xBC8F8F, // rgb(188,143,143)
133 royal_blue = 0x4169E1, // rgb(65,105,225)
134 saddle_brown = 0x8B4513, // rgb(139,69,19)
135 salmon = 0xFA8072, // rgb(250,128,114)
136 sandy_brown = 0xF4A460, // rgb(244,164,96)
137 sea_green = 0x2E8B57, // rgb(46,139,87)
138 sea_shell = 0xFFF5EE, // rgb(255,245,238)
139 sienna = 0xA0522D, // rgb(160,82,45)
140 silver = 0xC0C0C0, // rgb(192,192,192)
141 sky_blue = 0x87CEEB, // rgb(135,206,235)
142 slate_blue = 0x6A5ACD, // rgb(106,90,205)
143 slate_gray = 0x708090, // rgb(112,128,144)
144 snow = 0xFFFAFA, // rgb(255,250,250)
145 spring_green = 0x00FF7F, // rgb(0,255,127)
146 steel_blue = 0x4682B4, // rgb(70,130,180)
147 tan = 0xD2B48C, // rgb(210,180,140)
148 teal = 0x008080, // rgb(0,128,128)
149 thistle = 0xD8BFD8, // rgb(216,191,216)
150 tomato = 0xFF6347, // rgb(255,99,71)
151 turquoise = 0x40E0D0, // rgb(64,224,208)
152 violet = 0xEE82EE, // rgb(238,130,238)
153 wheat = 0xF5DEB3, // rgb(245,222,179)
154 white = 0xFFFFFF, // rgb(255,255,255)
155 white_smoke = 0xF5F5F5, // rgb(245,245,245)
156 yellow = 0xFFFF00, // rgb(255,255,0)
157 yellow_green = 0x9ACD32 // rgb(154,205,50)
158 }; // enum class color
159
160 enum class terminal_color : uint8_t {
161 black = 30,
162 red,
163 green,
164 yellow,
165 blue,
166 magenta,
167 cyan,
168 white,
169 bright_black = 90,
170 bright_red,
171 bright_green,
172 bright_yellow,
173 bright_blue,
174 bright_magenta,
175 bright_cyan,
176 bright_white
177 };
178
179 enum class emphasis : uint8_t {
180 bold = 1,
181 faint = 1 << 1,
182 italic = 1 << 2,
183 underline = 1 << 3,
184 blink = 1 << 4,
185 reverse = 1 << 5,
186 conceal = 1 << 6,
187 strikethrough = 1 << 7,
188 };
189
190 // rgb is a struct for red, green and blue colors.
191 // Using the name "rgb" makes some editors show the color in a tooltip.
192 struct rgb {
rgbrgb193 FMT_CONSTEXPR rgb() : r(0), g(0), b(0) {}
rgbrgb194 FMT_CONSTEXPR rgb(uint8_t r_, uint8_t g_, uint8_t b_) : r(r_), g(g_), b(b_) {}
rgbrgb195 FMT_CONSTEXPR rgb(uint32_t hex)
196 : r((hex >> 16) & 0xFF), g((hex >> 8) & 0xFF), b(hex & 0xFF) {}
rgbrgb197 FMT_CONSTEXPR rgb(color hex)
198 : r((uint32_t(hex) >> 16) & 0xFF),
199 g((uint32_t(hex) >> 8) & 0xFF),
200 b(uint32_t(hex) & 0xFF) {}
201 uint8_t r;
202 uint8_t g;
203 uint8_t b;
204 };
205
206 namespace detail {
207
208 // color is a struct of either a rgb color or a terminal color.
209 struct color_type {
color_typecolor_type210 FMT_CONSTEXPR color_type() noexcept : is_rgb(), value{} {}
color_typecolor_type211 FMT_CONSTEXPR color_type(color rgb_color) noexcept : is_rgb(true), value{} {
212 value.rgb_color = static_cast<uint32_t>(rgb_color);
213 }
color_typecolor_type214 FMT_CONSTEXPR color_type(rgb rgb_color) noexcept : is_rgb(true), value{} {
215 value.rgb_color = (static_cast<uint32_t>(rgb_color.r) << 16) |
216 (static_cast<uint32_t>(rgb_color.g) << 8) | rgb_color.b;
217 }
color_typecolor_type218 FMT_CONSTEXPR color_type(terminal_color term_color) noexcept
219 : is_rgb(), value{} {
220 value.term_color = static_cast<uint8_t>(term_color);
221 }
222 bool is_rgb;
223 union color_union {
224 uint8_t term_color;
225 uint32_t rgb_color;
226 } value;
227 };
228 } // namespace detail
229
230 /// A text style consisting of foreground and background colors and emphasis.
231 class text_style {
232 public:
233 FMT_CONSTEXPR text_style(emphasis em = emphasis()) noexcept
set_foreground_color()234 : set_foreground_color(), set_background_color(), ems(em) {}
235
236 FMT_CONSTEXPR auto operator|=(const text_style& rhs) -> text_style& {
237 if (!set_foreground_color) {
238 set_foreground_color = rhs.set_foreground_color;
239 foreground_color = rhs.foreground_color;
240 } else if (rhs.set_foreground_color) {
241 if (!foreground_color.is_rgb || !rhs.foreground_color.is_rgb)
242 report_error("can't OR a terminal color");
243 foreground_color.value.rgb_color |= rhs.foreground_color.value.rgb_color;
244 }
245
246 if (!set_background_color) {
247 set_background_color = rhs.set_background_color;
248 background_color = rhs.background_color;
249 } else if (rhs.set_background_color) {
250 if (!background_color.is_rgb || !rhs.background_color.is_rgb)
251 report_error("can't OR a terminal color");
252 background_color.value.rgb_color |= rhs.background_color.value.rgb_color;
253 }
254
255 ems = static_cast<emphasis>(static_cast<uint8_t>(ems) |
256 static_cast<uint8_t>(rhs.ems));
257 return *this;
258 }
259
260 friend FMT_CONSTEXPR auto operator|(text_style lhs, const text_style& rhs)
261 -> text_style {
262 return lhs |= rhs;
263 }
264
265 FMT_CONSTEXPR auto has_foreground() const noexcept -> bool {
266 return set_foreground_color;
267 }
268 FMT_CONSTEXPR auto has_background() const noexcept -> bool {
269 return set_background_color;
270 }
271 FMT_CONSTEXPR auto has_emphasis() const noexcept -> bool {
272 return static_cast<uint8_t>(ems) != 0;
273 }
274 FMT_CONSTEXPR auto get_foreground() const noexcept -> detail::color_type {
275 FMT_ASSERT(has_foreground(), "no foreground specified for this style");
276 return foreground_color;
277 }
278 FMT_CONSTEXPR auto get_background() const noexcept -> detail::color_type {
279 FMT_ASSERT(has_background(), "no background specified for this style");
280 return background_color;
281 }
282 FMT_CONSTEXPR auto get_emphasis() const noexcept -> emphasis {
283 FMT_ASSERT(has_emphasis(), "no emphasis specified for this style");
284 return ems;
285 }
286
287 private:
text_style(bool is_foreground,detail::color_type text_color)288 FMT_CONSTEXPR text_style(bool is_foreground,
289 detail::color_type text_color) noexcept
290 : set_foreground_color(), set_background_color(), ems() {
291 if (is_foreground) {
292 foreground_color = text_color;
293 set_foreground_color = true;
294 } else {
295 background_color = text_color;
296 set_background_color = true;
297 }
298 }
299
300 friend FMT_CONSTEXPR auto fg(detail::color_type foreground) noexcept
301 -> text_style;
302
303 friend FMT_CONSTEXPR auto bg(detail::color_type background) noexcept
304 -> text_style;
305
306 detail::color_type foreground_color;
307 detail::color_type background_color;
308 bool set_foreground_color;
309 bool set_background_color;
310 emphasis ems;
311 };
312
313 /// Creates a text style from the foreground (text) color.
314 FMT_CONSTEXPR inline auto fg(detail::color_type foreground) noexcept
315 -> text_style {
316 return text_style(true, foreground);
317 }
318
319 /// Creates a text style from the background color.
320 FMT_CONSTEXPR inline auto bg(detail::color_type background) noexcept
321 -> text_style {
322 return text_style(false, background);
323 }
324
325 FMT_CONSTEXPR inline auto operator|(emphasis lhs, emphasis rhs) noexcept
326 -> text_style {
327 return text_style(lhs) | rhs;
328 }
329
330 namespace detail {
331
332 template <typename Char> struct ansi_color_escape {
ansi_color_escapeansi_color_escape333 FMT_CONSTEXPR ansi_color_escape(color_type text_color,
334 const char* esc) noexcept {
335 // If we have a terminal color, we need to output another escape code
336 // sequence.
337 if (!text_color.is_rgb) {
338 bool is_background = esc == string_view("\x1b[48;2;");
339 uint32_t value = text_color.value.term_color;
340 // Background ASCII codes are the same as the foreground ones but with
341 // 10 more.
342 if (is_background) value += 10u;
343
344 size_t index = 0;
345 buffer[index++] = static_cast<Char>('\x1b');
346 buffer[index++] = static_cast<Char>('[');
347
348 if (value >= 100u) {
349 buffer[index++] = static_cast<Char>('1');
350 value %= 100u;
351 }
352 buffer[index++] = static_cast<Char>('0' + value / 10u);
353 buffer[index++] = static_cast<Char>('0' + value % 10u);
354
355 buffer[index++] = static_cast<Char>('m');
356 buffer[index++] = static_cast<Char>('\0');
357 return;
358 }
359
360 for (int i = 0; i < 7; i++) {
361 buffer[i] = static_cast<Char>(esc[i]);
362 }
363 rgb color(text_color.value.rgb_color);
364 to_esc(color.r, buffer + 7, ';');
365 to_esc(color.g, buffer + 11, ';');
366 to_esc(color.b, buffer + 15, 'm');
367 buffer[19] = static_cast<Char>(0);
368 }
ansi_color_escapeansi_color_escape369 FMT_CONSTEXPR ansi_color_escape(emphasis em) noexcept {
370 uint8_t em_codes[num_emphases] = {};
371 if (has_emphasis(em, emphasis::bold)) em_codes[0] = 1;
372 if (has_emphasis(em, emphasis::faint)) em_codes[1] = 2;
373 if (has_emphasis(em, emphasis::italic)) em_codes[2] = 3;
374 if (has_emphasis(em, emphasis::underline)) em_codes[3] = 4;
375 if (has_emphasis(em, emphasis::blink)) em_codes[4] = 5;
376 if (has_emphasis(em, emphasis::reverse)) em_codes[5] = 7;
377 if (has_emphasis(em, emphasis::conceal)) em_codes[6] = 8;
378 if (has_emphasis(em, emphasis::strikethrough)) em_codes[7] = 9;
379
380 size_t index = 0;
381 for (size_t i = 0; i < num_emphases; ++i) {
382 if (!em_codes[i]) continue;
383 buffer[index++] = static_cast<Char>('\x1b');
384 buffer[index++] = static_cast<Char>('[');
385 buffer[index++] = static_cast<Char>('0' + em_codes[i]);
386 buffer[index++] = static_cast<Char>('m');
387 }
388 buffer[index++] = static_cast<Char>(0);
389 }
390 FMT_CONSTEXPR operator const Char*() const noexcept { return buffer; }
391
392 FMT_CONSTEXPR auto begin() const noexcept -> const Char* { return buffer; }
393 FMT_CONSTEXPR20 auto end() const noexcept -> const Char* {
394 return buffer + basic_string_view<Char>(buffer).size();
395 }
396
397 private:
398 static constexpr size_t num_emphases = 8;
399 Char buffer[7u + 3u * num_emphases + 1u];
400
to_escansi_color_escape401 static FMT_CONSTEXPR void to_esc(uint8_t c, Char* out,
402 char delimiter) noexcept {
403 out[0] = static_cast<Char>('0' + c / 100);
404 out[1] = static_cast<Char>('0' + c / 10 % 10);
405 out[2] = static_cast<Char>('0' + c % 10);
406 out[3] = static_cast<Char>(delimiter);
407 }
408 static FMT_CONSTEXPR auto has_emphasis(emphasis em, emphasis mask) noexcept
409 -> bool {
410 return static_cast<uint8_t>(em) & static_cast<uint8_t>(mask);
411 }
412 };
413
414 template <typename Char>
415 FMT_CONSTEXPR auto make_foreground_color(color_type foreground) noexcept
416 -> ansi_color_escape<Char> {
417 return ansi_color_escape<Char>(foreground, "\x1b[38;2;");
418 }
419
420 template <typename Char>
421 FMT_CONSTEXPR auto make_background_color(color_type background) noexcept
422 -> ansi_color_escape<Char> {
423 return ansi_color_escape<Char>(background, "\x1b[48;2;");
424 }
425
426 template <typename Char>
427 FMT_CONSTEXPR auto make_emphasis(emphasis em) noexcept
428 -> ansi_color_escape<Char> {
429 return ansi_color_escape<Char>(em);
430 }
431
reset_color(buffer<Char> & buffer)432 template <typename Char> inline void reset_color(buffer<Char>& buffer) {
433 auto reset_color = string_view("\x1b[0m");
434 buffer.append(reset_color.begin(), reset_color.end());
435 }
436
437 template <typename T> struct styled_arg : view {
438 const T& value;
439 text_style style;
styled_argstyled_arg440 styled_arg(const T& v, text_style s) : value(v), style(s) {}
441 };
442
443 template <typename Char>
vformat_to(buffer<Char> & buf,const text_style & ts,basic_string_view<Char> fmt,basic_format_args<buffered_context<Char>> args)444 void vformat_to(buffer<Char>& buf, const text_style& ts,
445 basic_string_view<Char> fmt,
446 basic_format_args<buffered_context<Char>> args) {
447 bool has_style = false;
448 if (ts.has_emphasis()) {
449 has_style = true;
450 auto emphasis = make_emphasis<Char>(ts.get_emphasis());
451 buf.append(emphasis.begin(), emphasis.end());
452 }
453 if (ts.has_foreground()) {
454 has_style = true;
455 auto foreground = make_foreground_color<Char>(ts.get_foreground());
456 buf.append(foreground.begin(), foreground.end());
457 }
458 if (ts.has_background()) {
459 has_style = true;
460 auto background = make_background_color<Char>(ts.get_background());
461 buf.append(background.begin(), background.end());
462 }
463 vformat_to(buf, fmt, args);
464 if (has_style) reset_color<Char>(buf);
465 }
466 } // namespace detail
467
vprint(FILE * f,const text_style & ts,string_view fmt,format_args args)468 inline void vprint(FILE* f, const text_style& ts, string_view fmt,
469 format_args args) {
470 auto buf = memory_buffer();
471 detail::vformat_to(buf, ts, fmt, args);
472 print(f, FMT_STRING("{}"), string_view(buf.begin(), buf.size()));
473 }
474
475 /**
476 * Formats a string and prints it to the specified file stream using ANSI
477 * escape sequences to specify text formatting.
478 *
479 * **Example**:
480 *
481 * fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
482 * "Elapsed time: {0:.2f} seconds", 1.23);
483 */
484 template <typename... T>
print(FILE * f,const text_style & ts,format_string<T...> fmt,T &&...args)485 void print(FILE* f, const text_style& ts, format_string<T...> fmt,
486 T&&... args) {
487 vprint(f, ts, fmt.str, vargs<T...>{{args...}});
488 }
489
490 /**
491 * Formats a string and prints it to stdout using ANSI escape sequences to
492 * specify text formatting.
493 *
494 * **Example**:
495 *
496 * fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
497 * "Elapsed time: {0:.2f} seconds", 1.23);
498 */
499 template <typename... T>
print(const text_style & ts,format_string<T...> fmt,T &&...args)500 void print(const text_style& ts, format_string<T...> fmt, T&&... args) {
501 return print(stdout, ts, fmt, std::forward<T>(args)...);
502 }
503
504 inline auto vformat(const text_style& ts, string_view fmt, format_args args)
505 -> std::string {
506 auto buf = memory_buffer();
507 detail::vformat_to(buf, ts, fmt, args);
508 return fmt::to_string(buf);
509 }
510
511 /**
512 * Formats arguments and returns the result as a string using ANSI escape
513 * sequences to specify text formatting.
514 *
515 * **Example**:
516 *
517 * ```
518 * #include <fmt/color.h>
519 * std::string message = fmt::format(fmt::emphasis::bold | fg(fmt::color::red),
520 * "The answer is {}", 42);
521 * ```
522 */
523 template <typename... T>
524 inline auto format(const text_style& ts, format_string<T...> fmt, T&&... args)
525 -> std::string {
526 return fmt::vformat(ts, fmt.str, vargs<T...>{{args...}});
527 }
528
529 /// Formats a string with the given text_style and writes the output to `out`.
530 template <typename OutputIt,
531 FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
532 auto vformat_to(OutputIt out, const text_style& ts, string_view fmt,
533 format_args args) -> OutputIt {
534 auto&& buf = detail::get_buffer<char>(out);
535 detail::vformat_to(buf, ts, fmt, args);
536 return detail::get_iterator(buf, out);
537 }
538
539 /**
540 * Formats arguments with the given text style, writes the result to the output
541 * iterator `out` and returns the iterator past the end of the output range.
542 *
543 * **Example**:
544 *
545 * std::vector<char> out;
546 * fmt::format_to(std::back_inserter(out),
547 * fmt::emphasis::bold | fg(fmt::color::red), "{}", 42);
548 */
549 template <typename OutputIt, typename... T,
550 FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
551 inline auto format_to(OutputIt out, const text_style& ts,
552 format_string<T...> fmt, T&&... args) -> OutputIt {
553 return vformat_to(out, ts, fmt.str, vargs<T...>{{args...}});
554 }
555
556 template <typename T, typename Char>
557 struct formatter<detail::styled_arg<T>, Char> : formatter<T, Char> {
558 template <typename FormatContext>
559 auto format(const detail::styled_arg<T>& arg, FormatContext& ctx) const
560 -> decltype(ctx.out()) {
561 const auto& ts = arg.style;
562 auto out = ctx.out();
563
564 bool has_style = false;
565 if (ts.has_emphasis()) {
566 has_style = true;
567 auto emphasis = detail::make_emphasis<Char>(ts.get_emphasis());
568 out = detail::copy<Char>(emphasis.begin(), emphasis.end(), out);
569 }
570 if (ts.has_foreground()) {
571 has_style = true;
572 auto foreground =
573 detail::make_foreground_color<Char>(ts.get_foreground());
574 out = detail::copy<Char>(foreground.begin(), foreground.end(), out);
575 }
576 if (ts.has_background()) {
577 has_style = true;
578 auto background =
579 detail::make_background_color<Char>(ts.get_background());
580 out = detail::copy<Char>(background.begin(), background.end(), out);
581 }
582 out = formatter<T, Char>::format(arg.value, ctx);
583 if (has_style) {
584 auto reset_color = string_view("\x1b[0m");
585 out = detail::copy<Char>(reset_color.begin(), reset_color.end(), out);
586 }
587 return out;
588 }
589 };
590
591 /**
592 * Returns an argument that will be formatted using ANSI escape sequences,
593 * to be used in a formatting function.
594 *
595 * **Example**:
596 *
597 * fmt::print("Elapsed time: {0:.2f} seconds",
598 * fmt::styled(1.23, fmt::fg(fmt::color::green) |
599 * fmt::bg(fmt::color::blue)));
600 */
601 template <typename T>
602 FMT_CONSTEXPR auto styled(const T& value, text_style ts)
603 -> detail::styled_arg<remove_cvref_t<T>> {
604 return detail::styled_arg<remove_cvref_t<T>>{value, ts};
605 }
606
607 FMT_END_EXPORT
608 FMT_END_NAMESPACE
609
610 #endif // FMT_COLOR_H_
611