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// ConsoleCrayon.cs
//
// Author:
// Aaron Bockover <abockover@novell.com>
//
// Copyright (C) 2008 Novell, Inc.
//
// 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.
//
using System;
namespace Docky.Services.Logging
{
internal static class ConsoleCrayon
{
#region Public API
private static ConsoleColor foreground_color;
public static ConsoleColor ForegroundColor {
get { return foreground_color; }
set {
foreground_color = value;
SetColor (foreground_color, true);
}
}
private static ConsoleColor background_color;
public static ConsoleColor BackgroundColor {
get { return background_color; }
set {
background_color = value;
SetColor (background_color, false);
}
}
public static void ResetColor ()
{
if (XtermColors) {
Console.Write (GetAnsiResetControlCode ());
} else if (Environment.OSVersion.Platform != PlatformID.Unix &&
!RuntimeIsMono) {
Console.ResetColor ();
}
}
private static void SetColor (ConsoleColor color, bool isForeground)
{
if (color < ConsoleColor.Black || color > ConsoleColor.White) {
throw new ArgumentOutOfRangeException ("color",
"Not a ConsoleColor value.");
}
if (XtermColors) {
Console.Write (GetAnsiColorControlCode (color, isForeground));
} else if (Environment.OSVersion.Platform != PlatformID.Unix &&
!RuntimeIsMono) {
if (isForeground) {
Console.ForegroundColor = color;
} else {
Console.BackgroundColor = color;
}
}
}
#endregion
#region Ansi/VT Code Calculation
// Modified from Mono's System.TermInfoDriver
// License: MIT/X11
// Authors: Gonzalo Paniagua Javier <gonzalo@ximian.com>
// (C) 2005-2006 Novell, Inc <http://www.novell.com>
private static int TranslateColor (ConsoleColor desired, out bool light)
{
light = false;
switch (desired) {
// Dark colors
case ConsoleColor.Black: return 0;
case ConsoleColor.DarkRed: return 1;
case ConsoleColor.DarkGreen: return 2;
case ConsoleColor.DarkYellow: return 3;
case ConsoleColor.DarkBlue: return 4;
case ConsoleColor.DarkMagenta: return 5;
case ConsoleColor.DarkCyan: return 6;
case ConsoleColor.Gray: return 7;
// Light colors
case ConsoleColor.DarkGray: light = true; return 0;
case ConsoleColor.Red: light = true; return 1;
case ConsoleColor.Green: light = true; return 2;
case ConsoleColor.Yellow: light = true; return 3;
case ConsoleColor.Blue: light = true; return 4;
case ConsoleColor.Magenta: light = true; return 5;
case ConsoleColor.Cyan: light = true; return 6;
case ConsoleColor.White: default: light = true; return 7;
}
}
private static string GetAnsiColorControlCode (ConsoleColor color, bool isForeground)
{
// lighter fg colours are 90 -> 97 rather than 30 -> 37
// lighter bg colours are 100 -> 107 rather than 40 -> 47
bool light;
int code = TranslateColor (color, out light) + (isForeground ? 30 : 40) + (light ? 60 : 0);
return String.Format ("\x001b[{0}m", code);
}
private static string GetAnsiResetControlCode ()
{
return "\x001b[0m";
}
#endregion
#region xterm Detection
private static bool? xterm_colors = null;
public static bool XtermColors {
get {
if (xterm_colors == null) {
DetectXtermColors ();
}
return xterm_colors.Value;
}
}
[System.Runtime.InteropServices.DllImport ("libc", EntryPoint="isatty")]
private extern static int _isatty (int fd);
private static bool isatty (int fd)
{
try {
return _isatty (fd) == 1;
} catch {
return false;
}
}
private static void DetectXtermColors ()
{
bool _xterm_colors = false;
switch (Environment.GetEnvironmentVariable ("TERM")) {
case "xterm":
case "rxvt":
case "rxvt-unicode":
if (Environment.GetEnvironmentVariable ("COLORTERM") != null) {
_xterm_colors = true;
}
break;
case "xterm-color":
_xterm_colors = true;
break;
}
xterm_colors = _xterm_colors && isatty (1) && isatty (2);
}
#endregion
#region Runtime Detection
private static bool? runtime_is_mono;
public static bool RuntimeIsMono {
get {
if (runtime_is_mono == null) {
runtime_is_mono = Type.GetType ("System.MonoType") != null;
}
return runtime_is_mono.Value;
}
}
#endregion
}
}
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