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
use style::{Colour, Style};

use std::fmt;

use write::AnyWrite;


// ---- generating ANSI codes ----

impl Style {

    /// Write any bytes that go *before* a piece of text to the given writer.
    fn write_prefix<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {

        // If there are actually no styles here, then don’t write *any* codes
        // as the prefix. An empty ANSI code may not affect the terminal
        // output at all, but a user may just want a code-free string.
        if self.is_plain() {
            return Ok(());
        }

        // Write the codes’ prefix, then write numbers, separated by
        // semicolons, for each text style we want to apply.
        write!(f, "\x1B[")?;
        let mut written_anything = false;

        {
            let mut write_char = |c| {
                if written_anything { write!(f, ";")?; }
                written_anything = true;
                write!(f, "{}", c)?;
                Ok(())
            };

            if self.is_bold           { write_char('1')? }
            if self.is_dimmed         { write_char('2')? }
            if self.is_italic         { write_char('3')? }
            if self.is_underline      { write_char('4')? }
            if self.is_blink          { write_char('5')? }
            if self.is_reverse        { write_char('7')? }
            if self.is_hidden         { write_char('8')? }
            if self.is_strikethrough  { write_char('9')? }
        }

        // The foreground and background colours, if specified, need to be
        // handled specially because the number codes are more complicated.
        // (see `write_background_code` and `write_foreground_code`)
        if let Some(bg) = self.background {
            if written_anything { write!(f, ";")?; }
            written_anything = true;
            bg.write_background_code(f)?;
        }

        if let Some(fg) = self.foreground {
            if written_anything { write!(f, ";")?; }
            fg.write_foreground_code(f)?;
        }

        // All the codes end with an `m`, because reasons.
        write!(f, "m")?;

        Ok(())
    }

    /// Write any bytes that go *after* a piece of text to the given writer.
    fn write_suffix<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
        if self.is_plain() {
            Ok(())
        }
        else {
            write!(f, "{}", RESET)
        }
    }
}


/// The code to send to reset all styles and return to `Style::default()`.
pub static RESET: &str = "\x1B[0m";



impl Colour {
    fn write_foreground_code<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
        match *self {
            Colour::Black      => write!(f, "30"),
            Colour::Red        => write!(f, "31"),
            Colour::Green      => write!(f, "32"),
            Colour::Yellow     => write!(f, "33"),
            Colour::Blue       => write!(f, "34"),
            Colour::Purple     => write!(f, "35"),
            Colour::Cyan       => write!(f, "36"),
            Colour::White      => write!(f, "37"),
            Colour::Fixed(num) => write!(f, "38;5;{}", &num),
            Colour::RGB(r,g,b) => write!(f, "38;2;{};{};{}", &r, &g, &b),
        }
    }

    fn write_background_code<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
        match *self {
            Colour::Black      => write!(f, "40"),
            Colour::Red        => write!(f, "41"),
            Colour::Green      => write!(f, "42"),
            Colour::Yellow     => write!(f, "43"),
            Colour::Blue       => write!(f, "44"),
            Colour::Purple     => write!(f, "45"),
            Colour::Cyan       => write!(f, "46"),
            Colour::White      => write!(f, "47"),
            Colour::Fixed(num) => write!(f, "48;5;{}", &num),
            Colour::RGB(r,g,b) => write!(f, "48;2;{};{};{}", &r, &g, &b),
        }
    }
}


/// Like `ANSIString`, but only displays the style prefix.
///
/// This type implements the `Display` trait, meaning it can be written to a
/// `std::fmt` formatting without doing any extra allocation, and written to a
/// string with the `.to_string()` method. For examples, see
/// [`Style::prefix`](struct.Style.html#method.prefix).
#[derive(Clone, Copy, Debug)]
pub struct Prefix(Style);

/// Like `ANSIString`, but only displays the difference between two
/// styles.
///
/// This type implements the `Display` trait, meaning it can be written to a
/// `std::fmt` formatting without doing any extra allocation, and written to a
/// string with the `.to_string()` method. For examples, see
/// [`Style::infix`](struct.Style.html#method.infix).
#[derive(Clone, Copy, Debug)]
pub struct Infix(Style, Style);

/// Like `ANSIString`, but only displays the style suffix.
///
/// This type implements the `Display` trait, meaning it can be written to a
/// `std::fmt` formatting without doing any extra allocation, and written to a
/// string with the `.to_string()` method. For examples, see
/// [`Style::suffix`](struct.Style.html#method.suffix).
#[derive(Clone, Copy, Debug)]
pub struct Suffix(Style);


impl Style {

    /// The prefix bytes for this style. These are the bytes that tell the
    /// terminal to use a different colour or font style.
    ///
    /// # Examples
    ///
    /// ```
    /// use ansi_term::{Style, Colour::Blue};
    ///
    /// let style = Style::default().bold();
    /// assert_eq!("\x1b[1m",
    ///            style.prefix().to_string());
    ///
    /// let style = Blue.bold();
    /// assert_eq!("\x1b[1;34m",
    ///            style.prefix().to_string());
    ///
    /// let style = Style::default();
    /// assert_eq!("",
    ///            style.prefix().to_string());
    /// ```
    pub fn prefix(self) -> Prefix {
        Prefix(self)
    }

    /// The infix bytes between this style and `next` style. These are the bytes
    /// that tell the terminal to change the style to `next`. These may include
    /// a reset followed by the next colour and style, depending on the two styles.
    ///
    /// # Examples
    ///
    /// ```
    /// use ansi_term::{Style, Colour::Green};
    ///
    /// let style = Style::default().bold();
    /// assert_eq!("\x1b[32m",
    ///            style.infix(Green.bold()).to_string());
    ///
    /// let style = Green.normal();
    /// assert_eq!("\x1b[1m",
    ///            style.infix(Green.bold()).to_string());
    ///
    /// let style = Style::default();
    /// assert_eq!("",
    ///            style.infix(style).to_string());
    /// ```
    pub fn infix(self, next: Style) -> Infix {
        Infix(self, next)
    }

    /// The suffix for this style. These are the bytes that tell the terminal
    /// to reset back to its normal colour and font style.
    ///
    /// # Examples
    ///
    /// ```
    /// use ansi_term::{Style, Colour::Green};
    ///
    /// let style = Style::default().bold();
    /// assert_eq!("\x1b[0m",
    ///            style.suffix().to_string());
    ///
    /// let style = Green.normal().bold();
    /// assert_eq!("\x1b[0m",
    ///            style.suffix().to_string());
    ///
    /// let style = Style::default();
    /// assert_eq!("",
    ///            style.suffix().to_string());
    /// ```
    pub fn suffix(self) -> Suffix {
        Suffix(self)
    }
}


impl Colour {

    /// The prefix bytes for this colour as a `Style`. These are the bytes
    /// that tell the terminal to use a different colour or font style.
    ///
    /// See also [`Style::prefix`](struct.Style.html#method.prefix).
    ///
    /// # Examples
    ///
    /// ```
    /// use ansi_term::Colour::Green;
    ///
    /// assert_eq!("\x1b[0m",
    ///            Green.suffix().to_string());
    /// ```
    pub fn prefix(self) -> Prefix {
        Prefix(self.normal())
    }

    /// The infix bytes between this colour and `next` colour. These are the bytes
    /// that tell the terminal to use the `next` colour, or to do nothing if
    /// the two colours are equal.
    ///
    /// See also [`Style::infix`](struct.Style.html#method.infix).
    ///
    /// # Examples
    ///
    /// ```
    /// use ansi_term::Colour::{Red, Yellow};
    ///
    /// assert_eq!("\x1b[33m",
    ///            Red.infix(Yellow).to_string());
    /// ```
    pub fn infix(self, next: Colour) -> Infix {
        Infix(self.normal(), next.normal())
    }

    /// The suffix for this colour as a `Style`. These are the bytes that
    /// tell the terminal to reset back to its normal colour and font style.
    ///
    /// See also [`Style::suffix`](struct.Style.html#method.suffix).
    ///
    /// # Examples
    ///
    /// ```
    /// use ansi_term::Colour::Purple;
    ///
    /// assert_eq!("\x1b[0m",
    ///            Purple.suffix().to_string());
    /// ```
    pub fn suffix(self) -> Suffix {
        Suffix(self.normal())
    }
}


impl fmt::Display for Prefix {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let f: &mut fmt::Write = f;
        self.0.write_prefix(f)
    }
}


impl fmt::Display for Infix {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        use difference::Difference;

        match Difference::between(&self.0, &self.1) {
            Difference::ExtraStyles(style) => {
                let f: &mut fmt::Write = f;
                style.write_prefix(f)
            },
            Difference::Reset => {
                let f: &mut fmt::Write = f;
                write!(f, "{}{}", RESET, self.1.prefix())
            },
            Difference::NoDifference => {
                Ok(())   // nothing to write
            },
        }
    }
}


impl fmt::Display for Suffix {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let f: &mut fmt::Write = f;
        self.0.write_suffix(f)
    }
}



#[cfg(test)]
mod test {
    use style::Style;
    use style::Colour::*;

    macro_rules! test {
        ($name: ident: $style: expr; $input: expr => $result: expr) => {
            #[test]
            fn $name() {
                assert_eq!($style.paint($input).to_string(), $result.to_string());

                let mut v = Vec::new();
                $style.paint($input.as_bytes()).write_to(&mut v).unwrap();
                assert_eq!(v.as_slice(), $result.as_bytes());
            }
        };
    }

    test!(plain:                 Style::default();                  "text/plain" => "text/plain");
    test!(red:                   Red;                               "hi" => "\x1B[31mhi\x1B[0m");
    test!(black:                 Black.normal();                    "hi" => "\x1B[30mhi\x1B[0m");
    test!(yellow_bold:           Yellow.bold();                     "hi" => "\x1B[1;33mhi\x1B[0m");
    test!(yellow_bold_2:         Yellow.normal().bold();            "hi" => "\x1B[1;33mhi\x1B[0m");
    test!(blue_underline:        Blue.underline();                  "hi" => "\x1B[4;34mhi\x1B[0m");
    test!(green_bold_ul:         Green.bold().underline();          "hi" => "\x1B[1;4;32mhi\x1B[0m");
    test!(green_bold_ul_2:       Green.underline().bold();          "hi" => "\x1B[1;4;32mhi\x1B[0m");
    test!(purple_on_white:       Purple.on(White);                  "hi" => "\x1B[47;35mhi\x1B[0m");
    test!(purple_on_white_2:     Purple.normal().on(White);         "hi" => "\x1B[47;35mhi\x1B[0m");
    test!(yellow_on_blue:        Style::new().on(Blue).fg(Yellow);  "hi" => "\x1B[44;33mhi\x1B[0m");
    test!(yellow_on_blue_2:      Cyan.on(Blue).fg(Yellow);          "hi" => "\x1B[44;33mhi\x1B[0m");
    test!(cyan_bold_on_white:    Cyan.bold().on(White);             "hi" => "\x1B[1;47;36mhi\x1B[0m");
    test!(cyan_ul_on_white:      Cyan.underline().on(White);        "hi" => "\x1B[4;47;36mhi\x1B[0m");
    test!(cyan_bold_ul_on_white: Cyan.bold().underline().on(White); "hi" => "\x1B[1;4;47;36mhi\x1B[0m");
    test!(cyan_ul_bold_on_white: Cyan.underline().bold().on(White); "hi" => "\x1B[1;4;47;36mhi\x1B[0m");
    test!(fixed:                 Fixed(100);                        "hi" => "\x1B[38;5;100mhi\x1B[0m");
    test!(fixed_on_purple:       Fixed(100).on(Purple);             "hi" => "\x1B[45;38;5;100mhi\x1B[0m");
    test!(fixed_on_fixed:        Fixed(100).on(Fixed(200));         "hi" => "\x1B[48;5;200;38;5;100mhi\x1B[0m");
    test!(rgb:                   RGB(70,130,180);                   "hi" => "\x1B[38;2;70;130;180mhi\x1B[0m");
    test!(rgb_on_blue:           RGB(70,130,180).on(Blue);          "hi" => "\x1B[44;38;2;70;130;180mhi\x1B[0m");
    test!(blue_on_rgb:           Blue.on(RGB(70,130,180));          "hi" => "\x1B[48;2;70;130;180;34mhi\x1B[0m");
    test!(rgb_on_rgb:            RGB(70,130,180).on(RGB(5,10,15));  "hi" => "\x1B[48;2;5;10;15;38;2;70;130;180mhi\x1B[0m");
    test!(bold:                  Style::new().bold();               "hi" => "\x1B[1mhi\x1B[0m");
    test!(underline:             Style::new().underline();          "hi" => "\x1B[4mhi\x1B[0m");
    test!(bunderline:            Style::new().bold().underline();   "hi" => "\x1B[1;4mhi\x1B[0m");
    test!(dimmed:                Style::new().dimmed();             "hi" => "\x1B[2mhi\x1B[0m");
    test!(italic:                Style::new().italic();             "hi" => "\x1B[3mhi\x1B[0m");
    test!(blink:                 Style::new().blink();              "hi" => "\x1B[5mhi\x1B[0m");
    test!(reverse:               Style::new().reverse();            "hi" => "\x1B[7mhi\x1B[0m");
    test!(hidden:                Style::new().hidden();             "hi" => "\x1B[8mhi\x1B[0m");
    test!(stricken:              Style::new().strikethrough();      "hi" => "\x1B[9mhi\x1B[0m");

    #[test]
    fn test_infix() {
        assert_eq!(Style::new().dimmed().infix(Style::new()).to_string(), "\x1B[0m");
        assert_eq!(White.dimmed().infix(White.normal()).to_string(), "\x1B[0m\x1B[37m");
        assert_eq!(White.normal().infix(White.bold()).to_string(), "\x1B[1m");
        assert_eq!(White.normal().infix(Blue.normal()).to_string(), "\x1B[34m");
        assert_eq!(Blue.bold().infix(Blue.bold()).to_string(), "");
    }
}