162 lines
4.4 KiB
Python
162 lines
4.4 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2011 The Chromium OS Authors.
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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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from __future__ import print_function
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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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# Initially, we are set up to print to the terminal
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print_test_mode = False
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print_test_list = []
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class PrintLine:
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"""A line of text output
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Members:
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text: Text line that was printed
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newline: True to output a newline after the text
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colour: Text colour to use
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"""
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def __init__(self, text, newline, colour):
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self.text = text
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self.newline = newline
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self.colour = colour
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def __str__(self):
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return 'newline=%s, colour=%s, text=%s' % (self.newline, self.colour,
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self.text)
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def Print(text='', newline=True, colour=None):
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"""Handle a line of output to the terminal.
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In test mode this is recorded in a list. Otherwise it is output to the
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terminal.
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Args:
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text: Text to print
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newline: True to add a new line at the end of the text
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colour: Colour to use for the text
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"""
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if print_test_mode:
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print_test_list.append(PrintLine(text, newline, colour))
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else:
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if colour:
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col = Color()
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text = col.Color(colour, text)
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print(text, end='')
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if newline:
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print()
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else:
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sys.stdout.flush()
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def SetPrintTestMode():
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"""Go into test mode, where all printing is recorded"""
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global print_test_mode
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print_test_mode = True
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def GetPrintTestLines():
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"""Get a list of all lines output through Print()
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Returns:
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A list of PrintLine objects
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"""
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global print_test_list
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ret = print_test_list
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print_test_list = []
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return ret
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def EchoPrintTestLines():
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"""Print out the text lines collected"""
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for line in print_test_list:
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if line.colour:
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col = Color()
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print(col.Color(line.colour, line.text), end='')
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else:
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print(line.text, end='')
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if line.newline:
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print()
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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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try:
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self._enabled = (colored == COLOR_ALWAYS or
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(colored == COLOR_IF_TERMINAL and
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os.isatty(sys.stdout.fileno())))
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except:
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self._enabled = False
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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
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color, 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,
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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.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
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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
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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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