Feature - 256-color support

- Added new Color object.

src/Color.h

@@ -0,0 +1,75 @@
+////////////////////////////////////////////////////////////////////////////////
+// task - a command line task list manager.
+//
+// Copyright 2006 - 2009, Paul Beckingham.
+// All rights reserved.
+//
+// This program is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation; either version 2 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the
+//
+//     Free Software Foundation, Inc.,
+//     51 Franklin Street, Fifth Floor,
+//     Boston, MA
+//     02110-1301
+//     USA
+//
+////////////////////////////////////////////////////////////////////////////////
+#ifndef INCLUDED_COLOR
+#define INCLUDED_COLOR
+
+#include <string>
+
+
+////////////////////////////////////////////////////////////////////////////////
+// TODO Define how these bits are used.
+#define COLOR_256       0x00200000
+#define COLOR_NOBG      0x00100000
+#define COLOR_NOFG      0x00080000
+#define COLOR_UNDERLINE 0x00040000
+#define COLOR_BOLD      0x00020000
+#define COLOR_BRIGHT    0x00010000
+#define COLOR_BG        0x0000FF00
+#define COLOR_FG        0x000000FF
+
+class Color
+{
+public:
+  enum color_id {nocolor = 0, black, red, blue, green, magenta, cyan, yellow, white};
+
+  Color ();
+  Color (const Color&);
+  Color (unsigned int);                         // 256 | UNDERLINE | BOLD | BRIGHT | (BG << 8) | FG
+  Color (const std::string&);                   // "red on bright black"
+  Color (color_id, color_id, bool, bool, bool); // fg, bg, underline, bold, bright
+  ~Color ();
+  Color& operator= (const Color&);
+  operator std::string ();
+  operator int ();
+
+  void blend (const Color&);
+
+  std::string colorize (const std::string&);
+  std::string colorize (const std::string&, const std::string&);
+
+private:
+  int find (const std::string&);
+  std::string fg ();
+  std::string bg ();
+
+private:
+  unsigned int value;
+};
+
+#endif
+
+////////////////////////////////////////////////////////////////////////////////