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Viewing changes to Do.Platform.Windows/src/Do.Platform/ConsoleCrayon.cs

  • Committer: Chris S.
  • Date: 2009-06-21 03:37:34 UTC
  • Revision ID: chris@szikszoy.com-20090621033734-ud2jdcd5pq9r3ue9
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Do.Platform.Windows/src/Do.Platform/ConsoleCrayon.cs
 
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// ConsoleCrayon.cs
 
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//
 
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// Author:
 
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//   Aaron Bockover <abockover@novell.com>
 
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//
 
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// Copyright (C) 2008 Novell, Inc.
 
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//
 
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// Permission is hereby granted, free of charge, to any person obtaining
 
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// a copy of this software and associated documentation files (the
 
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// "Software"), to deal in the Software without restriction, including
 
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// without limitation the rights to use, copy, modify, merge, publish,
 
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// distribute, sublicense, and/or sell copies of the Software, and to
 
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// permit persons to whom the Software is furnished to do so, subject to
 
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// the following conditions:
 
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//
 
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// The above copyright notice and this permission notice shall be
 
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// included in all copies or substantial portions of the Software.
 
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//
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
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//
 
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using System;
 
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namespace Do.Platform
 
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{
 
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        public static class ConsoleCrayon
 
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        {
 
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#region Public API
 
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                private static ConsoleColor foreground_color;
 
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                public static ConsoleColor ForegroundColor {
 
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                        get { return foreground_color; }
 
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                        set {
 
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                                foreground_color = value;
 
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                                SetColor (foreground_color, true);
 
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                        }
 
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                }
 
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                private static ConsoleColor background_color;
 
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                public static ConsoleColor BackgroundColor {
 
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                        get { return background_color; }
 
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                        set {
 
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                                background_color = value;
 
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                                SetColor (background_color, false);
 
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                        }
 
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                }
 
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                public static void ResetColor ()
 
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                {
 
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                        if (XtermColors) {
 
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                                Console.Write (GetAnsiResetControlCode ());
 
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                        } else if (Environment.OSVersion.Platform != PlatformID.Unix &&
 
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                                                !RuntimeIsMono) {
 
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                                Console.ResetColor ();
 
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                        }
 
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                }
 
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                private static void SetColor (ConsoleColor color, bool isForeground)
 
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                {
 
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                        if (color < ConsoleColor.Black || color > ConsoleColor.White) {
 
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                                throw new ArgumentOutOfRangeException ("color",
 
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                                        "Not a ConsoleColor value.");
 
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                        }
 
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                        if (XtermColors) {
 
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                                Console.Write (GetAnsiColorControlCode (color, isForeground));
 
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                        } else if (Environment.OSVersion.Platform != PlatformID.Unix &&
 
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                                                !RuntimeIsMono) {
 
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                                if (isForeground) {
 
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                                        Console.ForegroundColor = color;
 
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                                } else {
 
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                                        Console.BackgroundColor = color;
 
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                                }
 
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                        }
 
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                }
 
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#endregion
 
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#region Ansi/VT Code Calculation
 
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                // Modified from Mono's System.TermInfoDriver
 
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                // License: MIT/X11
 
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                // Authors: Gonzalo Paniagua Javier <gonzalo@ximian.com>
 
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                // (C) 2005-2006 Novell, Inc <http://www.novell.com>
 
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                private static int TranslateColor (ConsoleColor desired, out bool light)
 
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                {
 
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                        light = false;
 
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                        switch (desired) {
 
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                                // Dark colors
 
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                                case ConsoleColor.Black: return 0;
 
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                                case ConsoleColor.DarkRed: return 1;
 
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                                case ConsoleColor.DarkGreen: return 2;
 
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                                case ConsoleColor.DarkYellow: return 3;
 
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                                case ConsoleColor.DarkBlue: return 4;
 
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                                case ConsoleColor.DarkMagenta: return 5;
 
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                                case ConsoleColor.DarkCyan: return 6;
 
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                                case ConsoleColor.Gray: return 7;
 
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                                                                                // Light colors
 
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                                case ConsoleColor.DarkGray: light = true; return 0;
 
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                                case ConsoleColor.Red: light = true; return 1;
 
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                                case ConsoleColor.Green: light = true; return 2;
 
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                                case ConsoleColor.Yellow: light = true; return 3;
 
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                                case ConsoleColor.Blue: light = true; return 4;
 
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                                case ConsoleColor.Magenta: light = true; return 5;
 
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                                case ConsoleColor.Cyan: light = true; return 6;
 
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                                case ConsoleColor.White: default: light = true; return 7;
 
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                        }
 
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                }
 
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                private static string GetAnsiColorControlCode (ConsoleColor color, bool isForeground)
 
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                {
 
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                        // lighter fg colours are 90 -> 97 rather than 30 -> 37
 
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                        // lighter bg colours are 100 -> 107 rather than 40 -> 47
 
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                        bool light;
 
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                        int code = TranslateColor (color, out light) + (isForeground ? 30 : 40) + (light ? 60 : 0);
 
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                        return String.Format ("\x001b[{0}m", code);
 
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                }
 
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                private static string GetAnsiResetControlCode ()
 
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                {
 
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                        return "\x001b[0m";
 
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                }
 
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#endregion
 
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#region xterm Detection
 
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                private static bool? xterm_colors = null;
 
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                public static bool XtermColors { 
 
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                        get {
 
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                                if (xterm_colors == null) {
 
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                                        DetectXtermColors ();
 
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                                }
 
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                                return xterm_colors.Value;
 
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                        }
 
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                }
 
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                [System.Runtime.InteropServices.DllImport ("libc", EntryPoint="isatty")]
 
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                        private extern static int _isatty (int fd);
 
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                private static bool isatty (int fd)
 
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                {
 
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                        try {
 
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                                return _isatty (fd) == 1;
 
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                        } catch {
 
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                                return false;
 
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                        }
 
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                }
 
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                private static void DetectXtermColors ()
 
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                {
 
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                        bool _xterm_colors = false;
 
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                        switch (Environment.GetEnvironmentVariable ("TERM")) {
 
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                                case "xterm":
 
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                                        case "rxvt":
 
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                                        case "rxvt-unicode": 
 
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                                        if (Environment.GetEnvironmentVariable ("COLORTERM") != null) {
 
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                                                _xterm_colors = true;
 
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                                        }
 
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                                break;
 
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                                case "xterm-color":
 
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                                        _xterm_colors = true;
 
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                                break;
 
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                        }
 
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                        xterm_colors = _xterm_colors && isatty (1) && isatty (2);
 
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                }
 
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#endregion
 
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#region Runtime Detection
 
183
 
 
184
                private static bool? runtime_is_mono;
 
185
                public static bool RuntimeIsMono {
 
186
                        get { 
 
187
                                if (runtime_is_mono == null) {
 
188
                                        runtime_is_mono = Type.GetType ("System.MonoType") != null;
 
189
                                }
 
190
 
 
191
                                return runtime_is_mono.Value;
 
192
                        }
 
193
                }
 
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#endregion
 
196
        }
 
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}
 
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