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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Terminal colorization utilities.
"""
from StringIO import StringIO
import atexit
import re
import colorama
from ..utils.formatting import safe_str
def _restore_terminal():
colorama.deinit()
colorama.init()
atexit.register(_restore_terminal)
class StringStylizer(object):
def __init__(self, str_, color_spec=None):
self._str = str_
self._color_spec = color_spec
def __repr__(self):
if self._color_spec:
return '{schema}{str}{reset}'.format(
schema=self._color_spec, str=safe_str(self._str), reset=Colors.Style.RESET_ALL)
return self._str
def __add__(self, other):
return safe_str(self) + other
def __radd__(self, other):
return other + safe_str(self)
def color(self, color_spec):
self._color_spec = color_spec
def replace(self, old, new, **kwargs):
self._str = self._str.replace(safe_str(old), safe_str(new), **kwargs)
def format(self, *args, **kwargs):
self._str = self._str.format(*args, **kwargs)
def highlight(self, pattern, schema):
if pattern is None:
return
for match in set(re.findall(re.compile(pattern), self._str)):
self.replace(match, schema + match + Colors.Style.RESET_ALL + self._color_spec)
def _get_colors(color_type):
for name in dir(color_type):
if not name.startswith('_'):
yield (name.lower(), getattr(color_type, name))
class Colors(object):
Fore = colorama.Fore
Back = colorama.Back
Style = colorama.Style
_colors = {
'fore': dict(_get_colors(Fore)),
'back': dict(_get_colors(Back)),
'style': dict(_get_colors(Style))
}
class ColorSpec(object):
def __init__(self, fore=None, back=None, style=None):
"""
It is possible to provide fore, back and style arguments. Each could be either the color as
lowercase letters, or the full color name for Colorama.
"""
self._kwargs = dict(fore=fore, back=back, style=style)
self._str = StringIO()
for type_, colors in Colors._colors.items():
value = self._kwargs.get(type_, None)
# the former case is if the value is a string, the latter is in case of an object.
self._str.write(colors.get(value) or value)
def __str__(self):
return self._str.getvalue()
def __add__(self, other):
return str(self) + str(other)
def __radd__(self, other):
return str(other) + str(self)
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