ansi_text 1.5.0

A library for styling and formatting terminal text using the ANSI escape codes.

example/example.dart

import 'dart:io';

import 'package:ansi_text/ansi_text.dart';

void main() {
  // disable markup, colors, and hyperlinks if the terminal does not support it
  AnsiText.enabled = stdout.hasTerminal && stdout.supportsAnsiEscapes;

  stdout
    ..writeln(AnsiText('AnsiText example page')
      ..boldUnderline()
      ..hyperlink(Uri.parse('https://github.com/drillster/ansi_text')))
    ..writeln();
  _printMarkupExamples();
  _printStandardColorExamples();
  _printBrightColorExamples();
  _printEightBitColorExamples();
  _printEightBitGrayscaleExamples();
  _printTrueColorExamples();
}

void _printMarkupExamples() {
  stdout
    ..writeln('Text markup:')
    ..write(' - ')
    ..writeln(AnsiText('Bold')..bold())
    ..write(' - ')
    ..writeln(AnsiText('Faint')..faint())
    ..write(' - ')
    ..writeln(AnsiText('Italic')..italic())
    ..write(' - ')
    ..writeln(AnsiText('Bold italic')..boldItalic())
    ..write(' - ')
    ..writeln(AnsiText('Underline')..underline())
    ..write(' - ')
    ..writeln(AnsiText('Bold underline')..boldUnderline())
    ..write(' - ')
    ..writeln(AnsiText('Blinking')..blink())
    ..write(' - ')
    ..writeln(AnsiText('Inverted')..inverted())
    ..write(' - ')
    ..write(AnsiText('Concealed')..concealed())
    ..writeln(' (concealed)')
    ..write(' - ')
    ..writeln(AnsiText('Strikethrough')..strikethrough())
    ..writeln();
}

void _printStandardColorExamples() {
  stdout
    ..writeln('Standard colors:')
    ..write(AnsiText(' Black   ')
      ..bold()
      ..bgBlack()
      ..brightWhite())
    ..write('  ')
    ..write(AnsiText(' Red     ')
      ..bold()
      ..bgRed()
      ..brightWhite())
    ..write('  ')
    ..write(AnsiText(' Green   ')
      ..bold()
      ..bgGreen()
      ..black())
    ..write('  ')
    ..write(AnsiText(' Yellow  ')
      ..bold()
      ..bgYellow()
      ..black())
    ..write('  ')
    ..write(AnsiText(' Blue    ')
      ..bold()
      ..bgBlue()
      ..black())
    ..write('  ')
    ..write(AnsiText(' Magenta ')
      ..bold()
      ..bgMagenta()
      ..white())
    ..write('  ')
    ..write(AnsiText(' Cyan    ')
      ..bold()
      ..bgCyan()
      ..black())
    ..write('  ')
    ..write(AnsiText(' White   ')
      ..bold()
      ..bgWhite()
      ..black())
    ..writeln()
    ..writeln();
}

void _printBrightColorExamples() {
  stdout
    ..writeln('Bright colors:')
    ..write(AnsiText(' Black   ')
      ..bold()
      ..bgBrightBlack()
      ..brightWhite())
    ..write('  ')
    ..write(AnsiText(' Red     ')
      ..bold()
      ..bgBrightRed()
      ..brightWhite())
    ..write('  ')
    ..write(AnsiText(' Green   ')
      ..bold()
      ..bgBrightGreen()
      ..black())
    ..write('  ')
    ..write(AnsiText(' Yellow  ')
      ..bold()
      ..bgBrightYellow()
      ..black())
    ..write('  ')
    ..write(AnsiText(' Blue    ')
      ..bold()
      ..bgBrightBlue()
      ..black())
    ..write('  ')
    ..write(AnsiText(' Magenta ')
      ..bold()
      ..bgBrightMagenta()
      ..white())
    ..write('  ')
    ..write(AnsiText(' Cyan    ')
      ..bold()
      ..bgBrightCyan()
      ..black())
    ..write('  ')
    ..write(AnsiText(' White   ')
      ..bold()
      ..bgBrightWhite()
      ..black())
    ..writeln()
    ..writeln();
}

void _printEightBitColorExamples() {
  stdout.writeln('216 RGB colors:');
  for (var r = 0; r <= 5; r++) {
    for (var g = 0; g <= 5; g++) {
      for (var b = 0; b <= 5; b++) {
        stdout
          ..write(AnsiText(' Color $r $g $b ')
            ..apply(Styles.color.background.rgb(r, g, b))
            ..apply(Styles.color.text.rgb(5 - r, 5 - g, 5 - b))
            ..bold())
          ..write('  ');
      }
      stdout.writeln();
    }
  }
  stdout.writeln();
}

void _printEightBitGrayscaleExamples() {
  stdout.writeln('Grayscale values:');
  for (var i = 0; i <= 23; i++) {
    stdout
      ..write(AnsiText(' Gray $i ${i < 10 ? ' ' : ''}')
        ..apply(Styles.color.background.gray(i))
        ..apply(Styles.color.text.gray(23 - i))
        ..bold())
      ..write('  ');
    if ((i + 1) % 6 == 0) {
      stdout.writeln();
    }
  }
  stdout.writeln();
}

void _printTrueColorExamples() {
  stdout.writeln('24-bit true color:');
  for (var mask = 1; mask < 8; mask++) {
    for (var i = 0; i < 256; i += 3) {
      stdout.write(
        AnsiText(' ')
          ..apply(
            Styles.color.background.trueColor(
              (mask & 4) != 0 ? i : 0,
              (mask & 2) != 0 ? i : 0,
              (mask & 1) != 0 ? i : 0,
            ),
          ),
      );
    }
    stdout.writeln();
  }
  stdout.writeln();
}