81 lines
2.2 KiB
Python
81 lines
2.2 KiB
Python
# Copyright (c) 2011 The Chromium OS Authors.
|
|
#
|
|
# SPDX-License-Identifier: GPL-2.0+
|
|
#
|
|
|
|
"""Terminal utilities
|
|
|
|
This module handles terminal interaction including ANSI color codes.
|
|
"""
|
|
|
|
import os
|
|
import sys
|
|
|
|
# Selection of when we want our output to be colored
|
|
COLOR_IF_TERMINAL, COLOR_ALWAYS, COLOR_NEVER = range(3)
|
|
|
|
class Color(object):
|
|
"""Conditionally wraps text in ANSI color escape sequences."""
|
|
BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8)
|
|
BOLD = -1
|
|
BRIGHT_START = '\033[1;%dm'
|
|
NORMAL_START = '\033[22;%dm'
|
|
BOLD_START = '\033[1m'
|
|
RESET = '\033[0m'
|
|
|
|
def __init__(self, colored=COLOR_IF_TERMINAL):
|
|
"""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 = (colored == COLOR_ALWAYS or
|
|
(colored == COLOR_IF_TERMINAL and os.isatty(sys.stdout.fileno())))
|
|
|
|
def Start(self, color, bright=True):
|
|
"""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:
|
|
base = self.BRIGHT_START if bright else self.NORMAL_START
|
|
return base % (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, bright=True):
|
|
"""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:
|
|
base = self.BRIGHT_START if bright else self.NORMAL_START
|
|
start = base % (color + 30)
|
|
return start + text + self.RESET
|