🖍 Kokuban

Kokuban simplifies styling strings in the terminal for .NET applications. (Kokuban is "blackboard" in Japanese.)

Kokuban is based on JavaScript library Chalk for many of its concepts and some of its code.

Features

• Expressive API
• Auto detects color support
• Auto enables escape sequence support on Windows 10 20H1 or later
• 256 (8-bit) / TrueColor (24-bit) colors support

Requirements

• .NET Standard 2.0 or higher
• Linux, macOS, Windows ...
  • Windows 10 Anniversary Update or later

Install

dotnet package add Kokuban

Usage

using Kokuban;

// Use `+` operator.
Console.WriteLine(Chalk.Red + "Hello");
Console.WriteLine(Chalk.Red + ("Hello " + (Chalk.Underline.BgBlue + "World")) + "!");

// Use indexer.
Console.WriteLine(Chalk.Red.Underline["Hello"]);
Console.WriteLine(Chalk.Red.Underline["Hello " + Chalk.Underline.BgBlue["World"]]);

// Use `ToStyledString` extension method.
Console.WriteLine("Foo Bar Baz".ToStyledString(Chalk.White.Blue));

// Use `Render` method.
Console.WriteLine(Chalk.Rgb(255, 128, 128).Render("Hello Konnichiwa!"));

Nested styles

If you nest styled strings, the styles will be automatically stacked.

Console.WriteLine(
    Chalk.Bold.Gray.BgYellow[
        "＼" + 
        Chalk.White.BgRed["Hello"] +
        " " +
        Chalk.White.BgBlue["コンニチハ"] +
        "!!／"
    ]
);
// or
Console.WriteLine(
    Chalk.Bold.Gray.BgYellow + (
        "＼" + (Chalk.White.BgRed + "Hello") + " " + (Chalk.White.BgBlue + "コンニチハ") + "!!／"
    )
);

API

Chalk.<style>{.<style>...}[string] (indexer)

Chalk.Red.Underline["Hello"] // => "Hello" (Red + Underlined)

Chalk.<style>{.<style>...} + string (+ operator)

(Chalk.Red.Underline + "Hello") // => "Hello" (Red + Underlined)

ToStyledString extension method

Console.WriteLine("Foo Bar Baz".ToStyledString(Chalk.White.Blue));

Chalk.Create method

You can customize the behavior by explicitly instancing the AnsiStyle and use it.

var chalk = Chalk.Create(new KokubanOptions
{
    // The output will be forced to plain text, whether the terminal supports colors or not.
    Mode = KokubanColorMode.None,
});

Console.WriteLine(chalk.Red.Underline["Hello"]); // => "Hello" without escape sequences.

KokubanColorValue struct

KokubanColorValue struct represents a color of AnsiStyle.

var byColor = KokubanColorValue.FromColor(KokubanColor.Blue);
var byCode = KokubanColorValue.FromBasic(31); // 4-bit
var byIndex = KokubanColorValue.FromIndex(196); // 8-bit (Index)
var byRgb = KokubanColorValue.FromRgb(128, 0, 0); // 24-bit

Console.WriteLine(Chalk.Foreground(byColor) + "Foo Bar");

Styles

• Decorations
  • Bold
  • Dim
  • Italic
  • Underline
  • Inverse
  • Overline
• Foreground colors
  • Black
  • Red
  • Green
  • Yellow
  • Blue
  • Magenta
  • Cyan
  • White
  • Gray
  • Grey
  • BrightBlack
  • BrightRed
  • BrightGreen
  • BrightYellow
  • BrightBlue
  • BrightMagenta
  • BrightCyan
  • BrightWhite
  • Foreground (for 3 or 4-bit)
  • Ansi256 (for 8-bit)
  • Rgb (for 24-bit)
• Background colors
  • BgBlack
  • BgRed
  • BgGreen
  • BgYellow
  • BgBlue
  • BgMagenta
  • BgCyan
  • BgWhite
  • BgGray
  • BgGrey
  • BgBrightBlack
  • BgBrightRed
  • BgBrightGreen
  • BgBrightYellow
  • BgBrightBlue
  • BgBrightMagenta
  • BgBrightCyan
  • BgBrightWhite
  • Background (for 3 or 4-bit)
  • BgAnsi256 (for 8-bit)
  • BgRgb (for 24-bit)

256 colors (8-bit) and TrueColor (24-bit) support

Kokuban also supports 256 colors (8-bit) and TrueColors (24-bit) on supported terminals, same as Chalk.

The automatic detection of support states and color downsampling are derived from Chalk.

Kokuban supports ANSI 256-palette index (Ansi256 method) and RGB format (Rgb method). However, Hex format (e.g. #AABBCC) is not yet supported.

License

MIT License

Copyright (c) Cysharp, Inc.
Copyright (c) Mayuki Sawatari <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

---- 
Part of the source code of this library is derived from the following libraries.
The original source codes are licensed under the MIT License.

chalk/supports-color
Copyright (c) Sindre Sorhus <[email protected]> (https://sindresorhus.com)

chalk/ansi-styles
Copyright (c) Sindre Sorhus <[email protected]> (https://sindresorhus.com)

Qix-/color-convert
Copyright © 2011-2016, Heather Arthur. Copyright © 2016-2021, Josh Junon.