color_print/lib.rs
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483
//! Colorize and stylize strings for terminal at compile-time, by using an HTML-like syntax.
//!
//! This library provides the following macros:
//!
//! - `cformat!(<FORMAT_STRING> [, ARGS...])`
//! - `cprint!(<FORMAT_STRING> [, ARGS...])`
//! - `cprintln!(<FORMAT_STRING> [, ARGS...])`
//! - `ceprint!(<FORMAT_STRING> [, ARGS...])`
//! - `ceprintln!(<FORMAT_STRING> [, ARGS...])`
//! - `cwrite!(f, <FORMAT_STRING> [, ARGS...])`
//! - `cwriteln!(f, <FORMAT_STRING> [, ARGS...])`
//! - `cstr!(<FORMAT_STRING>)`
//! - `untagged!(<FORMAT_STRING>)`
//!
//! The macros have the same syntax as their corresponding [`std`] variants:
//! - [`cformat!()`] as [`format!()`]
//! - [`cprint!()`] as [`print!()`]
//! - [`cprintln!()`] as [`println!()`]
//! - [`ceprint!()`] as [`eprint!()`]
//! - [`ceprintln!()`] as [`eprintln!()`]
//! - [`cwrite!()`] as [`write!()`]
//! - [`cwriteln!()`] as [`writeln!()`]
//!
//! But they accept an additional syntax inside the
//! format string: HTML-like tags which add ANSI colors/styles at compile-time.
//!
//! [`cstr!()`] only transforms the given string literal into another string literal, without
//! formatting anything else than the colors tag.
//!
//! [`untagged!()`] removes all the tags found in the given string literal.
//!
//! ## What does it do ?
//!
//! By default, the provided macros will replace the tags found in the format string by ANSI
//! hexadecimal escape codes. E.g.:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! cprintln!("HELLO <green>WORLD</green>");
//! cprintln!("HELLO <green>WORLD</>"); // Alternative, shorter syntax
//! # }
//! ```
//!
//! will be replaced by:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! println!("HELLO \u{1b}[31mWORLD\u{1b}[39m")
//! # }
//! ```
//!
//! *Note*: it is possible to change this behaviour by activating the feature `terminfo`. Then it
//! will question the `terminfo` database at runtime in order to know which sequence to write for
//! each kind of styling/colorizing (see below for more detail).
//!
//! # Pros/cons of this crate
//!
//! ## Pros
//!
//! * Styling is processed at compile-time, so the runtime payload is inexistant (unless the
//! feature `terminfo` is activated);
//! * Nested tags are well handled, e.g. `"<green>...<blue>...</blue>...</green>"`;
//! * Some optimizations are performed to avoid redundant ANSI sequences, because these
//! optimizations can be done at compile-time without impacting the runtime;
//! * Almost every tag has a short name, so colorizing can be done quickly: `"my <b>blue</> word"`;
//! * Each provided macro can be used exactly in the same way as the standard `format!`-like
//! macros; e.g., positional arguments and named arguments can be used as usual;
//! * Supports 16, 256 and 16M colors;
//! * Fine-grained error handling (errors will be given at compile-time).
//!
//! ## Cons
//!
//! * Not compatible with non-ANSI terminals.
//!
//! # Introduction
//!
//! ## Basic example
//!
//! ```
//! use color_print::cprintln;
//! cprintln!("Hello <green>world</green>!");
//! ```
//!
//! ## Closing a tag more simply: the `</>` tag
//!
//! Basically, tags must be closed by giving *exactly* the same colors/styles as their matching
//! open tag (with a slash `/` at the beginning), e.g: `<blue,bold>...</blue,bold>`. But it can be
//! tedious!
//!
//! So, it is also possible to close the last open tag simply with `</>`:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! cprintln!("Hello <green>world</>!");
//! # }
//! ```
//!
//! ## Combining colors and styles
//!
//! Multiple styles and colors can be combined into a single tag by separating them with the `,`
//! comma character:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! cprintln!("This a <green,bold>green and bold text</green,bold>.");
//! // The same, but closing with the </> tag:
//! cprintln!("This a <green,bold>green and bold text</>.");
//! # }
//! ```
//!
//! ## Nesting tags
//!
//! Any tag can be nested with any other.
//!
//! *Note*: The closing tags must match correctly (following the basic rules of nesting for HTML
//! tags), but it can always be simplified by using the tag `</>`.
//!
//! Example of nested tags:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! cprintln!("<green>This is green, <bold>then green and bold</bold>, then green again</green>");
//! cprintln!("<green>This is green, <bold>then green and bold</>, then green again</>");
//!
//! // Colors can be nested as well:
//! cprintln!("<green>This is green, <blue>then blue</blue>, then green again</green>");
//! cprintln!("<green>This is green, <blue>then blue</>, then green again</>");
//! # }
//! ```
//!
//! ## Unclosed tags are automatically closed at the end of the format string
//!
//! Tags which have not been closed manually will be closed automatically, which means that the
//! ANSI sequences needed to go back to the original state will be added:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! // The two following lines are strictly equivalent:
//! cprintln!("<green><bold>Hello");
//! cprintln!("<green><bold>Hello</></>");
//! # }
//! ```
//!
//! ## How to display the chars `<` and `>` verbatim
//!
//! As for `{` and `}` in standard format strings, the chars `<` and `>` have to be doubled in
//! order to display them verbatim:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! cprintln!("This is an angle bracket character: <<, and here is another one: >>");
//! # }
//! ```
//!
//! # Optimization: no redundant ANSI codes
//!
//! The expanded format string will only contain the *needed* ANSI codes. This is done by making a
//! diff of the different style attributes, each time a tag is encountered, instead of mechanically
//! adding the ANSI codes.
//!
//! E.g., several nested `<bold>` tags will only produce one bold ANSI sequence:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! cprintln!("<bold><bold> A <bold,blue> B </> C </></>")
//! # }
//! ```
//!
//! will be replaced by:
//!
//! ```
//! # use color_print::cprintln;
//! # fn main() {
//! println!("\u{1b}[1m A \u{1b}[34m B \u{1b}[39m C \u{1b}[22m")
//! // ^-------^ ^--------^ ^--------^ ^--------^
//! // bold blue color bold
//! // reset reset
//! # }
//! ```
//!
//! # The feature `terminfo`
//!
//! Instead of inserting ANSI sequences directly into the format string, it is possible to activate
//! the feature `terminfo`: this will add the format sequences at runtime, by consulting the
//! `terminfo` database.
//!
//! This has one pro and several cons:
//!
//! #### Pros
//!
//! * This adds a level of compatibility for some terminals.
//!
//! #### Cons
//!
//! * This adds a little runtime payload;
//! * This adds two dependencies: [`lazy_static`] and [`terminfo`];
//! * The styles `<strike>` and `<conceal>` are not handled;
//! * With `terminfo`, many styles are not resettable individually, which implies longer format
//! sequences for the same result;
//! * For now, the provided macros can only be used in one thread.
//!
//! [`lazy_static`]: https://crates.io/crates/lazy_static
//! [`terminfo`]: https://crates.io/crates/terminfo
//!
//! # Naming rules of the tags:
//!
//! Each tag has at least a **long name**, like `<magenta>` or `<underline>`.
//!
//! The tags directly relative to *colors* (like `<red>`, `<bg:blue>`, `<bg:bright-green>`..., as
//! opposed to *style* tags like `<bold>`, `<italics>`...) have some common naming rules:
//!
//! * Each tag has four variants:
//! - `<mycolor>`: the normal, foreground color;
//! - `<bright-mycolor>` or `<mycolor!>`: the bright, foreground color;
//! - `<bg:mycolor>`, `<MYCOLOR>`: the normal, background color;
//! - `<bg:bright-mycolor>`, `<bg:mycolor!>`, `<BRIGHT-MYCOLOR>` or `<MYCOLOR!>`: the bright,
//! background color;
//! * Each tag has a *shortcut*, with a base letter for each color; example with the `x` letter:
//! - `<x>`: the normal, foreground color;
//! - `<x!>`: the bright, foreground color;
//! - `<bg:x>`, `<X>`: the normal, background color;
//! - `<bg:x!>`, `<X!>`: the bright, background color;
//! * Each color's shortcut letter is simply the **first letter of its name** (excepted for `<k>`
//! which is the shortcut for `<black>`), e.g. `<y>` is the shortcut for `<yellow>`;
//! * Each color's tag which is uppercase is a **background color**;
//! * Each tag which has a trailing exclamation point `!` is a **bright color**;
//!
//! # List of accepted tags:
//!
//! The two first columns show which styles are supported, respectively with the default crate
//! features (ANSI column), and with the feature `terminfo` being activated.
//!
//! | ANSI | Terminfo | Shortcuts | Long names | Aliases |
//! | ---- | -------- | --------- | ----------------------- | ----------------------------------------------- |
//! | X | X | `<s>` | `<strong>` | `<em>` `<bold>` |
//! | X | X | | `<dim>` | |
//! | X | X | `<u>` | `<underline>` | |
//! | X | | | `<strike>` | |
//! | X | X | | `<reverse>` | `<rev>` |
//! | X | | | `<conceal>` | `<hide>` |
//! | X | X | `<i>` | `<italics>` | `<italic>` |
//! | X | X | | `<blink>` | |
//! | X | X | `<k>` | `<black>` | |
//! | X | X | `<r>` | `<red>` | |
//! | X | X | `<g>` | `<green>` | |
//! | X | X | `<y>` | `<yellow>` | |
//! | X | X | `<b>` | `<blue>` | |
//! | X | X | `<m>` | `<magenta>` | |
//! | X | X | `<c>` | `<cyan>` | |
//! | X | X | `<w>` | `<white>` | |
//! | X | X | `<k!>` | `<bright-black>` | `<black!>` |
//! | X | X | `<r!>` | `<bright-red>` | `<red!>` |
//! | X | X | `<g!>` | `<bright-green>` | `<green!>` |
//! | X | X | `<y!>` | `<bright-yellow>` | `<yellow!>` |
//! | X | X | `<b!>` | `<bright-blue>` | `<blue!>` |
//! | X | X | `<m!>` | `<bright-magenta>` | `<magenta!>` |
//! | X | X | `<c!>` | `<bright-cyan>` | `<cyan!>` |
//! | X | X | `<w!>` | `<bright-white>` | `<white!>` |
//! | X | X | `<K>` | `<bg:black>` | `<BLACK>` |
//! | X | X | `<R>` | `<bg:red>` | `<RED>` |
//! | X | X | `<G>` | `<bg:green>` | `<GREEN>` |
//! | X | X | `<Y>` | `<bg:yellow>` | `<YELLOW>` |
//! | X | X | `<B>` | `<bg:blue>` | `<BLUE>` |
//! | X | X | `<M>` | `<bg:magenta>` | `<MAGENTA>` |
//! | X | X | `<C>` | `<bg:cyan>` | `<CYAN>` |
//! | X | X | `<W>` | `<bg:white>` | `<WHITE>` |
//! | X | X | `<K!>` | `<bg:bright-black>` | `<BLACK!>` `<bg:black!>` `<BRIGHT-BLACK>` |
//! | X | X | `<R!>` | `<bg:bright-red>` | `<RED!>` `<bg:red!>` `<BRIGHT-RED>` |
//! | X | X | `<G!>` | `<bg:bright-green>` | `<GREEN!>` `<bg:green!>` `<BRIGHT-GREEN>` |
//! | X | X | `<Y!>` | `<bg:bright-yellow>` | `<YELLOW!>` `<bg:yellow!>` `<BRIGHT-YELLOW>` |
//! | X | X | `<B!>` | `<bg:bright-blue>` | `<BLUE!>` `<bg:blue!>` `<BRIGHT-BLUE>` |
//! | X | X | `<M!>` | `<bg:bright-magenta>` | `<MAGENTA!>` `<bg:magenta!>` `<BRIGHT-MAGENTA>` |
//! | X | X | `<C!>` | `<bg:bright-cyan>` | `<CYAN!>` `<bg:cyan!>` `<BRIGHT-CYAN>` |
//! | X | X | `<W!>` | `<bg:bright-white>` | `<WHITE!>` `<bg:white!>` `<BRIGHT-WHITE>` |
//! | X | | | `<rgb(r,g,b)>` | `<#RRGGBB>` |
//! | X | | | `<bg:rgb(r,g,b)>` | `<bg:#RRGGBB>` `<RGB(r,g,b)>` |
//! | X | | `<0>`...`<255>` | `<palette(...)>` | `<p(...)>` `<pal(...)>` |
//! | X | | `<P(...)>` | `<bg:palette(...)>` | `<PALETTE(...)>` `<PAL(...)>` `<bg:p(...)>` `<bg:pal(...)>` |
pub use color_print_proc_macro::{
ceprint, ceprintln, cformat, cprint, cprintln, cstr, cwrite, cwriteln, untagged,
};
#[cfg(feature = "terminfo")]
mod terminfo;
#[cfg(feature = "terminfo")]
pub use terminfo::*;
#[cfg(test)]
mod tests {
use std::fmt::Write as _;
use super::*;
#[cfg(feature = "terminfo")]
pub mod color_print {
pub use super::*;
}
#[test]
fn format_no_arg() {
assert_eq!(cformat!(), "");
cprint!();
cprintln!();
}
#[test]
fn format_no_color() {
assert_eq!(cformat!(""), "");
assert_eq!(cformat!("Hi"), "Hi");
assert_eq!(cformat!("Hi {}", 12), "Hi 12");
assert_eq!(cformat!("Hi {n} {}", 12, n = 24), "Hi 24 12");
let mut s = String::new();
cwrite!(&mut s, "").unwrap();
assert_eq!(s, "");
let mut s = String::new();
cwrite!(&mut s, "Hi").unwrap();
assert_eq!(s, "Hi");
let mut s = String::new();
cwrite!(&mut s, "Hi {}", 12).unwrap();
assert_eq!(s, "Hi 12");
let mut s = String::new();
cwrite!(&mut s, "Hi {n} {}", 12, n = 24).unwrap();
assert_eq!(s, "Hi 24 12");
}
#[test]
#[cfg(not(feature = "terminfo"))]
#[rustfmt::skip]
fn format_basic() {
assert_eq!(cformat!("<red>Hi</red>"), "\u{1b}[31mHi\u{1b}[39m");
assert_eq!(cformat!("<red>Hi</r>"), "\u{1b}[31mHi\u{1b}[39m");
assert_eq!(cformat!("<red>Hi</>"), "\u{1b}[31mHi\u{1b}[39m");
assert_eq!(cformat!("<bg:red>Hi</bg:red>"), "\u{1b}[41mHi\u{1b}[49m");
assert_eq!(cformat!("<bg:red>Hi</R>"), "\u{1b}[41mHi\u{1b}[49m");
assert_eq!(cformat!("<bg:red>Hi</>"), "\u{1b}[41mHi\u{1b}[49m");
assert_eq!(
cformat!("Hi <bold>word</bold> !"),
"Hi \u{1b}[1mword\u{1b}[22m !"
);
assert_eq!(cformat!("Hi <em>word</em> !"), "Hi \u{1b}[1mword\u{1b}[22m !");
assert_eq!(cformat!("Hi <em>word</> !"), "Hi \u{1b}[1mword\u{1b}[22m !");
assert_eq!(
cformat!("
<bold>bold</>
<dim>dim</>
<underline>underline</>
<strike>strike</>
<reverse>reverse</>
<conceal>conceal</>
<italics>italics</>
<blink>blink</>
"),
"
\u{1b}[1mbold\u{1b}[22m
\u{1b}[2mdim\u{1b}[22m
\u{1b}[4munderline\u{1b}[24m
\u{1b}[9mstrike\u{1b}[29m
\u{1b}[7mreverse\u{1b}[27m
\u{1b}[8mconceal\u{1b}[28m
\u{1b}[3mitalics\u{1b}[23m
\u{1b}[5mblink\u{1b}[25m
"
);
let mut s = String::new();
cwrite!(&mut s, "Hi <r>{v}</> {}", 12, v = "Hi").unwrap();
assert_eq!(s, "Hi \u{1b}[31mHi\u{1b}[39m 12");
let mut s = String::new();
cwriteln!(&mut s, "Hi <r>{v} {}", 12, v = "Hi").unwrap();
assert_eq!(s, "Hi \u{1b}[31mHi 12\u{1b}[39m\n");
}
#[test]
#[ignore]
#[cfg(not(feature = "terminfo"))]
fn bold_and_dim_should_be_optimized() {
assert_eq!(
cformat!("<bold>BOLD</><dim>DIM</>"),
"\u{1b}[1mBOLD\u{1b}[2mDIM\u{1b}[22m"
);
}
#[test]
#[cfg(not(feature = "terminfo"))]
fn format_multiple() {
assert_eq!(
cformat!("Hi <bold>word</bold> <red>red</red> !"),
"Hi \u{1b}[1mword\u{1b}[22m \u{1b}[31mred\u{1b}[39m !"
);
}
#[test]
#[cfg(not(feature = "terminfo"))]
fn format_optimization() {
assert_eq!(
cformat!("<red>RED<blue>BLUE</>RED</>"),
"\u{1b}[31mRED\u{1b}[34mBLUE\u{1b}[31mRED\u{1b}[39m"
);
assert_eq!(
cformat!("<red><blue>BLUE</>RED</>"),
"\u{1b}[34mBLUE\u{1b}[31mRED\u{1b}[39m"
);
assert_eq!(cformat!("<red></>Text"), "Text");
}
#[test]
#[cfg(not(feature = "terminfo"))]
#[rustfmt::skip]
fn format_auto_close_tag() {
assert_eq!(
cformat!("<red>RED<blue>BLUE"),
"\u{1b}[31mRED\u{1b}[34mBLUE\u{1b}[39m"
);
assert!(
cformat!("<red>RED<em>BOLD") == "\u{1b}[31mRED\u{1b}[1mBOLD\u{1b}[22m\u{1b}[39m"
||
cformat!("<red>RED<em>BOLD") == "\u{1b}[31mRED\u{1b}[1mBOLD\u{1b}[39m\u{1b}[22m"
);
}
#[test]
#[cfg(feature = "terminfo")]
fn terminfo_format_basic() {
assert_eq!(cformat!("<red>Hi</red>"), format!("{}Hi{}", *RED, *CLEAR));
assert_eq!(
cformat!("Hi <bold>word</bold> !"),
format!("Hi {}word{} !", *BOLD, *CLEAR)
);
let mut s = String::new();
cwrite!(&mut s, "<r>Hi</> {}", 12).unwrap();
assert_eq!(s, format!("{}Hi{} 12", *RED, *CLEAR));
}
#[test]
#[cfg(feature = "terminfo")]
fn terminfo_format_multiple() {
assert_eq!(
cformat!("Hi <bold>word</bold> <red>red</red> !"),
format!("Hi {}word{} {}red{} !", *BOLD, *CLEAR, *RED, *CLEAR)
);
}
#[test]
#[cfg(feature = "terminfo")]
fn terminfo_format_auto_close_tag() {
assert_eq!(
cformat!("<red>RED<blue>BLUE"),
format!("{}RED{}BLUE{}", *RED, *BLUE, *CLEAR)
);
assert_eq!(
cformat!("<red>RED<em>BOLD"),
format!("{}RED{}BOLD{}", *RED, *BOLD, *CLEAR)
);
}
#[test]
fn untagged() {
assert_eq!(untagged!(""), "");
assert_eq!(untagged!("hi"), "hi");
assert_eq!(untagged!("<red>hi"), "hi");
assert_eq!(untagged!("<red>hi</>"), "hi");
assert_eq!(untagged!("<red>hi <em,blue>all"), "hi all");
assert_eq!(untagged!("<red>hi <em>all</></>"), "hi all");
}
}