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1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
80 lines
2.2 KiB
Python
80 lines
2.2 KiB
Python
# Copyright (c) 2011 The Chromium OS Authors.
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#
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# SPDX-License-Identifier: GPL-2.0+
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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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import os
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import sys
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# Selection of when we want our output to be colored
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COLOR_IF_TERMINAL, COLOR_ALWAYS, COLOR_NEVER = range(3)
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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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BRIGHT_START = '\033[1;%dm'
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NORMAL_START = '\033[22;%dm'
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BOLD_START = '\033[1m'
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RESET = '\033[0m'
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def __init__(self, colored=COLOR_IF_TERMINAL):
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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 = (colored == COLOR_ALWAYS or
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(colored == COLOR_IF_TERMINAL and os.isatty(sys.stdout.fileno())))
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def Start(self, color, bright=True):
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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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base = self.BRIGHT_START if bright else self.NORMAL_START
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return base % (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, bright=True):
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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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base = self.BRIGHT_START if bright else self.NORMAL_START
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start = base % (color + 30)
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return start + text + self.RESET
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