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tonerdo/readline: A Pure C# GNU-Readline like library for .NET/.NET Core

ReadLine is a GNU Readline like library built in pure C#. It can serve as a drop in replacement for the inbuilt Console.ReadLine() and brings along with it some of the terminal goodness you get from unix shells, like command history navigation and tab auto completion.

It is cross platform and runs anywhere .NET is supported, targeting netstandard1.3 means that it can be used with .NET Core as well as the full .NET Framework.

Shortcut Comment Ctrl+A / HOME Beginning of line Ctrl+B / ← Backward one character Ctrl+C Send EOF Ctrl+E / END End of line Ctrl+F / → Forward one character Ctrl+H / Backspace Delete previous character Tab Command line completion Shift+Tab Backwards command line completion Ctrl+J / Enter Line feed Ctrl+K Cut text to the end of line Ctrl+L / Esc Clear line Ctrl+M Same as Enter key Ctrl+N / ↓ Forward in history Ctrl+P / ↑ Backward in history Ctrl+U Cut text to the start of line Ctrl+W Cut previous word Backspace Delete previous character Ctrl + D / Delete Delete succeeding character

Available on NuGet

Visual Studio:

PM> Install-Package ReadLine

.NET Core CLI:

dotnet add package ReadLine

Read input from the console

string input = ReadLine.Read("(prompt)> ");

Read password from the console

string password = ReadLine.ReadPassword("(prompt)> ");

Note: The (prompt>) is optional

// Get command history
ReadLine.GetHistory();

// Add command to history
ReadLine.AddHistory("dotnet run");

// Clear history
ReadLine.ClearHistory();

// Disable history
ReadLine.HistoryEnabled = false;

Note: History information is persisted for an entire application session. Also, calls to ReadLine.Read() automatically adds the console input to history

class AutoCompletionHandler : IAutoCompleteHandler
{
    // characters to start completion from
    public char[] Separators { get; set; } = new char[] { ' ', '.', '/' };

    // text - The current text entered in the console
    // index - The index of the terminal cursor within {text}
    public string[] GetSuggestions(string text, int index)
    {
        if (text.StartsWith("git "))
            return new string[] { "init", "clone", "pull", "push" };
        else
            return null;
    }
}

ReadLine.AutoCompletionHandler = new AutoCompletionHandler();

Note: If no "AutoCompletionHandler" is set, tab autocompletion will be disabled

Contributions are highly welcome. If you have found a bug or if you have a feature request, please report them at this repository issues section.

Things you can help with:

Achieve better command parity with GNU Readline.
Add more test cases.

This project is licensed under the MIT license. See the LICENSE file for more info.

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