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