1 # Copyright (c) 2011 The Chromium OS Authors.
3 # SPDX-License-Identifier: GPL-2.0+
8 This module handles terminal interaction including ANSI color codes.
14 # Selection of when we want our output to be colored
15 COLOR_IF_TERMINAL, COLOR_ALWAYS, COLOR_NEVER = range(3)
17 # Initially, we are set up to print to the terminal
18 print_test_mode = False
22 """A line of text output
25 text: Text line that was printed
26 newline: True to output a newline after the text
27 colour: Text colour to use
29 def __init__(self, text, newline, colour):
31 self.newline = newline
35 return 'newline=%s, colour=%s, text=%s' % (self.newline, self.colour,
38 def Print(text='', newline=True, colour=None):
39 """Handle a line of output to the terminal.
41 In test mode this is recorded in a list. Otherwise it is output to the
46 newline: True to add a new line at the end of the text
47 colour: Colour to use for the text
50 print_test_list.append(PrintLine(text, newline, colour))
54 text = col.Color(colour, text)
61 def SetPrintTestMode():
62 """Go into test mode, where all printing is recorded"""
63 global print_test_mode
65 print_test_mode = True
67 def GetPrintTestLines():
68 """Get a list of all lines output through Print()
71 A list of PrintLine objects
73 global print_test_list
79 def EchoPrintTestLines():
80 """Print out the text lines collected"""
81 for line in print_test_list:
84 print col.Color(line.colour, line.text),
92 """Conditionally wraps text in ANSI color escape sequences."""
93 BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8)
95 BRIGHT_START = '\033[1;%dm'
96 NORMAL_START = '\033[22;%dm'
97 BOLD_START = '\033[1m'
100 def __init__(self, colored=COLOR_IF_TERMINAL):
101 """Create a new Color object, optionally disabling color output.
104 enabled: True if color output should be enabled. If False then this
105 class will not add color codes at all.
108 self._enabled = (colored == COLOR_ALWAYS or
109 (colored == COLOR_IF_TERMINAL and
110 os.isatty(sys.stdout.fileno())))
112 self._enabled = False
114 def Start(self, color, bright=True):
115 """Returns a start color code.
118 color: Color to use, .e.g BLACK, RED, etc.
121 If color is enabled, returns an ANSI sequence to start the given
122 color, otherwise returns empty string
125 base = self.BRIGHT_START if bright else self.NORMAL_START
126 return base % (color + 30)
130 """Retruns a stop color code.
133 If color is enabled, returns an ANSI color reset sequence,
134 otherwise returns empty string
140 def Color(self, color, text, bright=True):
141 """Returns text with conditionally added color escape sequences.
144 color: Text color -- one of the color constants defined in this
146 text: The text to color.
149 If self._enabled is False, returns the original text. If it's True,
150 returns text with color escape sequences based on the value of
153 if not self._enabled:
155 if color == self.BOLD:
156 start = self.BOLD_START
158 base = self.BRIGHT_START if bright else self.NORMAL_START
159 start = base % (color + 30)
160 return start + text + self.RESET