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+# Copyright (c) 2011 The Chromium OS Authors.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+"""Terminal utilities
+
+This module handles terminal interaction including ANSI color codes.
+"""
+
+class Color(object):
+ """Conditionally wraps text in ANSI color escape sequences."""
+ BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8)
+ BOLD = -1
+ COLOR_START = '\033[1;%dm'
+ BOLD_START = '\033[1m'
+ RESET = '\033[0m'
+
+ def __init__(self, enabled=True):
+ """Create a new Color object, optionally disabling color output.
+
+ Args:
+ enabled: True if color output should be enabled. If False then this
+ class will not add color codes at all.
+ """
+ self._enabled = enabled
+
+ def Start(self, color):
+ """Returns a start color code.
+
+ Args:
+ color: Color to use, .e.g BLACK, RED, etc.
+
+ Returns:
+ If color is enabled, returns an ANSI sequence to start the given color,
+ otherwise returns empty string
+ """
+ if self._enabled:
+ return self.COLOR_START % (color + 30)
+ return ''
+
+ def Stop(self):
+ """Retruns a stop color code.
+
+ Returns:
+ If color is enabled, returns an ANSI color reset sequence, otherwise
+ returns empty string
+ """
+ if self._enabled:
+ return self.RESET
+ return ''
+
+ def Color(self, color, text):
+ """Returns text with conditionally added color escape sequences.
+
+ Keyword arguments:
+ color: Text color -- one of the color constants defined in this class.
+ text: The text to color.
+
+ Returns:
+ If self._enabled is False, returns the original text. If it's True,
+ returns text with color escape sequences based on the value of color.
+ """
+ if not self._enabled:
+ return text
+ if color == self.BOLD:
+ start = self.BOLD_START
+ else:
+ start = self.COLOR_START % (color + 30)
+ return start + text + self.RESET