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Copy of AnsiConsole from aspnet/dnx/dev/src/Microsoft.Extensions.CommandLineUtils.Sources

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Pranav K 2015-11-19 02:14:03 -08:00 • committed by Krzysztof Wicher
parent da70b047e9
commit 6e465818c5
1 changed files with 143 additions and 0 deletions
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src/Microsoft.DotNet.Cli.Utils/AnsiConsole.cs Normal file
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.IO;
namespace Microsoft.DotNet.Cli.Utils
{
internal class AnsiConsole
{
private AnsiConsole(TextWriter writer, bool useConsoleColor)
{
Writer = writer;
_useConsoleColor = useConsoleColor;
if (_useConsoleColor)
{
OriginalForegroundColor = Console.ForegroundColor;
}
}
private int _boldRecursion;
private bool _useConsoleColor;
public static AnsiConsole GetOutput(bool useConsoleColor)
{
return new AnsiConsole(Console.Out, useConsoleColor);
}
public static AnsiConsole GetError(bool useConsoleColor)
{
return new AnsiConsole(Console.Error, useConsoleColor);
}
public TextWriter Writer { get; }
public ConsoleColor OriginalForegroundColor { get; }
private void SetColor(ConsoleColor color)
{
Console.ForegroundColor = (ConsoleColor)(((int)Console.ForegroundColor & 0x08) | ((int)color & 0x07));
}
private void SetBold(bool bold)
{
_boldRecursion += bold ? 1 : -1;
if (_boldRecursion > 1 || (_boldRecursion == 1 && !bold))
{
return;
}
Console.ForegroundColor = (ConsoleColor)((int)Console.ForegroundColor ^ 0x08);
}
public void WriteLine(string message)
{
if (!_useConsoleColor)
{
Writer.WriteLine(message);
return;
}
var escapeScan = 0;
for (;;)
{
var escapeIndex = message.IndexOf("\x1b[", escapeScan);
if (escapeIndex == -1)
{
var text = message.Substring(escapeScan);
Writer.Write(text);
break;
}
else
{
var startIndex = escapeIndex + 2;
var endIndex = startIndex;
while (endIndex != message.Length &&
message[endIndex] >= 0x20 &&
message[endIndex] <= 0x3f)
{
endIndex += 1;
}
var text = message.Substring(escapeScan, escapeIndex - escapeScan);
Writer.Write(text);
if (endIndex == message.Length)
{
break;
}
switch (message[endIndex])
{
case 'm':
int value;
if (int.TryParse(message.Substring(startIndex, endIndex - startIndex), out value))
{
switch (value)
{
case 1:
SetBold(true);
break;
case 22:
SetBold(false);
break;
case 30:
SetColor(ConsoleColor.Black);
break;
case 31:
SetColor(ConsoleColor.Red);
break;
case 32:
SetColor(ConsoleColor.Green);
break;
case 33:
SetColor(ConsoleColor.Yellow);
break;
case 34:
SetColor(ConsoleColor.Blue);
break;
case 35:
SetColor(ConsoleColor.Magenta);
break;
case 36:
SetColor(ConsoleColor.Cyan);
break;
case 37:
SetColor(ConsoleColor.Gray);
break;
case 39:
SetColor(OriginalForegroundColor);
break;
}
}
break;
}
escapeScan = endIndex + 1;
}
}
Writer.WriteLine();
}
}
}