# Copyright (C) 2000-2014 Bastian Kleineidam
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
ANSI Color definitions and functions. For Windows systems, the colorama module
uses ctypes and Windows DLLs to generate colored output.
From Term::ANSIColor, applies also to this module:
The codes output by this module are standard terminal control codes,
complying with ECMA-48 and ISO 6429 (generally referred to as "ANSI color"
for the color codes). The non-color control codes (bold, dark, italic,
underline, and reverse) are part of the earlier ANSI X3.64 standard for
control sequences for video terminals and peripherals.
Note that not all displays are ISO 6429-compliant, or even X3.64-compliant
(or are even attempting to be so).
Jean Delvare provided the following table of different common terminal
emulators and their support for the various attributes and others have
helped me flesh it out::
clear bold dark under blink reverse conceal
------------------------------------------------------------------------
xterm yes yes no yes bold yes yes
linux yes yes yes bold yes yes no
rxvt yes yes no yes bold/black yes no
dtterm yes yes yes yes reverse yes yes
teraterm yes reverse no yes rev/red yes no
aixterm kinda normal no yes no yes yes
PuTTY yes color no yes no yes no
Windows yes no no no no yes no
Cygwin SSH yes yes no color color color yes
SEE ALSO
ECMA-048 is available on-line (at least at the time of this writing) at
http://www.ecma-international.org/publications/standards/ECMA-048.HTM.
ISO 6429 is available from ISO for a charge; the author of this module does
not own a copy of it. Since the source material for ISO 6429 was ECMA-048
and the latter is available for free, there seems little reason to obtain
the ISO standard.
"""
import os
import logging
import types
from .fileutil import has_module, is_tty
if os.name == 'nt':
from . import colorama
has_curses = has_module("curses")
# Color constants
# Escape for ANSI colors
AnsiEsc = "\x1b[%sm"
# Control constants
bold = 'bold'
light = 'light'
underline = 'underline'
blink = 'blink'
invert = 'invert'
concealed = 'concealed'
# Control numbers
AnsiControl = {
None: '',
bold: '1',
light: '2',
# italic: '3', # unsupported
underline: '4',
blink: '5',
# rapidblink: '6', # unsupported
invert: '7',
concealed: '8',
# strikethrough: '9', # unsupported
}
# Color constants
default = 'default'
black = 'black'
red = 'red'
green = 'green'
yellow = 'yellow'
blue = 'blue'
purple = 'purple'
cyan = 'cyan'
white = 'white'
# inverse colors
Black = 'Black'
Red = 'Red'
Green = 'Green'
Yellow = 'Yellow'
Blue = 'Blue'
Purple = 'Purple'
Cyan = 'Cyna'
White = 'White'
InverseColors = (Black, Red, Green, Yellow, Blue, Purple, Cyan, White)
# Ansi color numbers; capitalized colors are inverse
AnsiColor = {
None: '0',
default: '0',
black: '30',
red: '31',
green: '32',
yellow: '33',
blue: '34',
purple: '35',
cyan: '36',
white: '37',
Black: '40',
Red: '41',
Green: '42',
Yellow: '43',
Blue: '44',
Purple: '45',
Cyan: '46',
White: '47',
}
if os.name == 'nt':
# Windows color numbers; capitalized colors are used as background
WinColor = {
None: None,
default: colorama.GREY,
black: colorama.BLACK,
red: colorama.RED,
green: colorama.GREEN,
yellow: colorama.YELLOW,
blue: colorama.BLUE,
purple: colorama.MAGENTA,
cyan: colorama.CYAN,
white: colorama.GREY,
Black: colorama.BLACK,
Red: colorama.RED,
Green: colorama.GREEN,
Yellow: colorama.YELLOW,
Blue: colorama.BLUE,
Purple: colorama.MAGENTA,
Cyan: colorama.CYAN,
White: colorama.GREY,
}
else:
WinColor = {
None: None,
}
# pc speaker beep escape code
Beep = "\007"
[docs]
def esc_ansicolor(color):
"""convert a named color definition to an escaped ANSI color"""
control = ''
if ";" in color:
control, color = color.split(";", 1)
control = AnsiControl.get(control, '') + ";"
cnum = AnsiColor.get(color, '0')
return AnsiEsc % (control + cnum)
AnsiReset = esc_ansicolor(default)
[docs]
def get_win_color(color):
"""Convert a named color definition to Windows console color foreground,
background and style numbers."""
foreground = background = style = None
control = ''
if ";" in color:
control, color = color.split(";", 1)
if control == bold:
style = colorama.BRIGHT
if color in InverseColors:
background = WinColor[color]
else:
foreground = WinColor.get(color)
return foreground, background, style
[docs]
def has_colors(fp):
"""Test if given file is an ANSI color enabled tty."""
# The is_tty() function ensures that we do not colorize
# redirected streams, as this is almost never what we want
if not is_tty(fp):
return False
if os.name == 'nt':
return True
elif has_curses:
import curses
try:
curses.setupterm(os.environ.get("TERM"), fp.fileno())
# More than 8 colors are good enough.
return curses.tigetnum("colors") >= 8
except curses.error:
return False
return False
[docs]
def get_columns(fp):
"""Return number of columns for given file."""
if not is_tty(fp):
return 80
if os.name == 'nt':
return colorama.get_console_size().X
if has_curses:
import curses
try:
curses.setupterm(os.environ.get("TERM"), fp.fileno())
return curses.tigetnum("cols")
except curses.error:
pass
return 80
def _write_color_colorama(fp, text, color):
"""Colorize text with given color."""
foreground, background, style = get_win_color(color)
colorama.set_console(foreground=foreground, background=background, style=style)
fp.write(text)
colorama.reset_console()
def _write_color_ansi(fp, text, color):
"""Colorize text with given color."""
fp.write(esc_ansicolor(color))
fp.write(text)
fp.write(AnsiReset)
if os.name == 'nt':
write_color = _write_color_colorama
colorama.init()
else:
write_color = _write_color_ansi
[docs]
class Colorizer:
"""Prints colored messages to streams."""
def __init__(self, fp):
"""Initialize with given stream (file-like object)."""
self.fp = fp
if has_colors(fp):
self.write = self._write_color
else:
self.write = self._write
def _write(self, text, color=None):
"""Print text as-is."""
self.fp.write(text)
def _write_color(self, text, color=None):
"""Print text with given color. If color is None, print text as-is."""
if color is None:
self.fp.write(text)
else:
write_color(self.fp, text, color)
def __getattr__(self, name):
"""Delegate attribute access to the stored stream object."""
return getattr(self.fp, name)
[docs]
class ColoredStreamHandler(logging.StreamHandler):
"""Send colored log messages to streams (file-like objects)."""
def __init__(self, strm=None):
"""Log to given stream (a file-like object) or to stderr if
strm is None.
"""
super().__init__(strm)
self.stream = Colorizer(self.stream)
# standard log level colors (used by get_color)
self.colors = {
logging.WARN: 'bold;yellow',
logging.ERROR: 'light;red',
logging.CRITICAL: 'bold;red',
logging.DEBUG: 'white',
}
[docs]
def get_color(self, record):
"""Get appropriate color according to log level.
"""
return self.colors.get(record.levelno, 'default')
[docs]
def emit(self, record):
"""Emit a record.
If a formatter is specified, it is used to format the record.
The record is then written to the stream with a trailing newline
[N.B. this may be removed depending on feedback].
"""
color = self.get_color(record)
msg = self.format(record)
if not hasattr(types, "UnicodeType"):
# no unicode support
self.stream.write("%s" % msg, color=color)
else:
try:
self.stream.write("%s" % msg, color=color)
except UnicodeError:
self.stream.write("%s" % msg.encode("UTF-8"), color=color)
self.stream.write(os.linesep)
self.flush()