87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
# Copyright (c) 2011 The Chromium OS Authors.
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#
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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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"""Terminal utilities
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This module handles terminal interaction including ANSI color codes.
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"""
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class Color(object):
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"""Conditionally wraps text in ANSI color escape sequences."""
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BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8)
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BOLD = -1
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COLOR_START = '\033[1;%dm'
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BOLD_START = '\033[1m'
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RESET = '\033[0m'
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def __init__(self, enabled=True):
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"""Create a new Color object, optionally disabling color output.
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Args:
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enabled: True if color output should be enabled. If False then this
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class will not add color codes at all.
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"""
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self._enabled = enabled
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def Start(self, color):
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"""Returns a start color code.
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Args:
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color: Color to use, .e.g BLACK, RED, etc.
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Returns:
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If color is enabled, returns an ANSI sequence to start the given color,
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otherwise returns empty string
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"""
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if self._enabled:
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return self.COLOR_START % (color + 30)
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return ''
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def Stop(self):
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"""Retruns a stop color code.
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Returns:
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If color is enabled, returns an ANSI color reset sequence, otherwise
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returns empty string
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"""
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if self._enabled:
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return self.RESET
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return ''
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def Color(self, color, text):
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"""Returns text with conditionally added color escape sequences.
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Keyword arguments:
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color: Text color -- one of the color constants defined in this class.
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text: The text to color.
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Returns:
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If self._enabled is False, returns the original text. If it's True,
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returns text with color escape sequences based on the value of color.
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"""
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if not self._enabled:
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return text
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if color == self.BOLD:
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start = self.BOLD_START
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else:
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start = self.COLOR_START % (color + 30)
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return start + text + self.RESET
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