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# -*- coding: utf-8 -*-
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"""Tools for coloring text in ANSI terminals.
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"""
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#*****************************************************************************
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# Copyright (C) 2002-2006 Fernando Perez. <fperez@colorado.edu>
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#*****************************************************************************
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__all__ = ['TermColors','InputTermColors','ColorScheme','ColorSchemeTable']
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import os
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from IPython.utils.ipstruct import Struct
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color_templates = (
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# Dark colors
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("Black" , "0;30"),
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("Red" , "0;31"),
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("Green" , "0;32"),
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("Brown" , "0;33"),
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("Blue" , "0;34"),
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("Purple" , "0;35"),
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("Cyan" , "0;36"),
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("LightGray" , "0;37"),
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# Light colors
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("DarkGray" , "1;30"),
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("LightRed" , "1;31"),
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("LightGreen" , "1;32"),
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("Yellow" , "1;33"),
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("LightBlue" , "1;34"),
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("LightPurple" , "1;35"),
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("LightCyan" , "1;36"),
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("White" , "1;37"),
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# Blinking colors. Probably should not be used in anything serious.
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("BlinkBlack" , "5;30"),
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("BlinkRed" , "5;31"),
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("BlinkGreen" , "5;32"),
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("BlinkYellow" , "5;33"),
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("BlinkBlue" , "5;34"),
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("BlinkPurple" , "5;35"),
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("BlinkCyan" , "5;36"),
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("BlinkLightGray", "5;37"),
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)
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def make_color_table(in_class):
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"""Build a set of color attributes in a class.
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Helper function for building the :class:`TermColors` and
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:class`InputTermColors`.
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"""
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for name,value in color_templates:
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setattr(in_class,name,in_class._base % value)
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class TermColors:
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"""Color escape sequences.
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This class defines the escape sequences for all the standard (ANSI?)
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colors in terminals. Also defines a NoColor escape which is just the null
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string, suitable for defining 'dummy' color schemes in terminals which get
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confused by color escapes.
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This class should be used as a mixin for building color schemes."""
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NoColor = '' # for color schemes in color-less terminals.
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Normal = '\033[0m' # Reset normal coloring
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_base = '\033[%sm' # Template for all other colors
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# Build the actual color table as a set of class attributes:
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make_color_table(TermColors)
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class InputTermColors:
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"""Color escape sequences for input prompts.
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This class is similar to TermColors, but the escapes are wrapped in \\001
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and \\002 so that readline can properly know the length of each line and
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can wrap lines accordingly. Use this class for any colored text which
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needs to be used in input prompts, such as in calls to raw_input().
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This class defines the escape sequences for all the standard (ANSI?)
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colors in terminals. Also defines a NoColor escape which is just the null
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string, suitable for defining 'dummy' color schemes in terminals which get
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confused by color escapes.
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This class should be used as a mixin for building color schemes."""
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NoColor = '' # for color schemes in color-less terminals.
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if os.name == 'nt' and os.environ.get('TERM','dumb') == 'emacs':
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# (X)emacs on W32 gets confused with \001 and \002 so we remove them
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Normal = '\033[0m' # Reset normal coloring
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_base = '\033[%sm' # Template for all other colors
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else:
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Normal = '\001\033[0m\002' # Reset normal coloring
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_base = '\001\033[%sm\002' # Template for all other colors
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# Build the actual color table as a set of class attributes:
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make_color_table(InputTermColors)
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class NoColors:
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"""This defines all the same names as the colour classes, but maps them to
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empty strings, so it can easily be substituted to turn off colours."""
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NoColor = ''
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Normal = ''
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for name, value in color_templates:
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setattr(NoColors, name, '')
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class ColorScheme:
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"""Generic color scheme class. Just a name and a Struct."""
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def __init__(self,__scheme_name_,colordict=None,**colormap):
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self.name = __scheme_name_
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if colordict is None:
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self.colors = Struct(**colormap)
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else:
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self.colors = Struct(colordict)
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def copy(self,name=None):
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"""Return a full copy of the object, optionally renaming it."""
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if name is None:
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name = self.name
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return ColorScheme(name, self.colors.dict())
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class ColorSchemeTable(dict):
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"""General class to handle tables of color schemes.
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It's basically a dict of color schemes with a couple of shorthand
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attributes and some convenient methods.
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active_scheme_name -> obvious
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active_colors -> actual color table of the active scheme"""
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def __init__(self, scheme_list=None, default_scheme=''):
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"""Create a table of color schemes.
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The table can be created empty and manually filled or it can be
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created with a list of valid color schemes AND the specification for
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the default active scheme.
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"""
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# create object attributes to be set later
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self.active_scheme_name = ''
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self.active_colors = None
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if scheme_list:
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if default_scheme == '':
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raise ValueError('you must specify the default color scheme')
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for scheme in scheme_list:
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self.add_scheme(scheme)
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self.set_active_scheme(default_scheme)
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def copy(self):
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"""Return full copy of object"""
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return ColorSchemeTable(self.values(),self.active_scheme_name)
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def add_scheme(self,new_scheme):
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"""Add a new color scheme to the table."""
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if not isinstance(new_scheme,ColorScheme):
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raise ValueError('ColorSchemeTable only accepts ColorScheme instances')
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self[new_scheme.name] = new_scheme
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def set_active_scheme(self,scheme,case_sensitive=0):
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"""Set the currently active scheme.
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Names are by default compared in a case-insensitive way, but this can
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be changed by setting the parameter case_sensitive to true."""
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scheme_names = list(self.keys())
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if case_sensitive:
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valid_schemes = scheme_names
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scheme_test = scheme
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else:
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valid_schemes = [s.lower() for s in scheme_names]
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scheme_test = scheme.lower()
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try:
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scheme_idx = valid_schemes.index(scheme_test)
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except ValueError as e:
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raise ValueError('Unrecognized color scheme: ' + scheme + \
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'\nValid schemes: '+str(scheme_names).replace("'', ",'')) from e
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else:
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active = scheme_names[scheme_idx]
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self.active_scheme_name = active
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self.active_colors = self[active].colors
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# Now allow using '' as an index for the current active scheme
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self[''] = self[active]
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