116 lines
3.6 KiB
Python
116 lines
3.6 KiB
Python
# Copyright 2011-2015, Damian Johnson and The Tor Project
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# See LICENSE for licensing information
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"""
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Utilities for working with the terminal.
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**Module Overview:**
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::
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format - wrap text with ANSI for the given colors or attributes
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.. data:: Color (enum)
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.. data:: BgColor (enum)
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Enumerations for foreground or background terminal color.
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=========== ===========
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Color Description
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=========== ===========
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**BLACK** black color
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**BLUE** blue color
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**CYAN** cyan color
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**GREEN** green color
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**MAGENTA** magenta color
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**RED** red color
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**WHITE** white color
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**YELLOW** yellow color
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=========== ===========
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.. data:: Attr (enum)
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Enumerations of terminal text attributes.
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=================== ===========
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Attr Description
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=================== ===========
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**BOLD** heavy typeface
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**HILIGHT** inverted foreground and background
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**UNDERLINE** underlined text
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**READLINE_ESCAPE** wrap encodings in `RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE sequences <https://stackoverflow.com/questions/9468435/look-how-to-fix-column-calculation-in-python-readline-if-use-color-prompt>`_
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=================== ===========
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"""
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import stem.util.enum
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import stem.util.str_tools
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TERM_COLORS = ('BLACK', 'RED', 'GREEN', 'YELLOW', 'BLUE', 'MAGENTA', 'CYAN', 'WHITE')
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# DISABLE_COLOR_SUPPORT is *not* being vended to Stem users. This is likely to
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# go away if I can think of a more graceful method for color toggling.
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DISABLE_COLOR_SUPPORT = False
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Color = stem.util.enum.Enum(*TERM_COLORS)
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BgColor = stem.util.enum.Enum(*['BG_' + color for color in TERM_COLORS])
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Attr = stem.util.enum.Enum('BOLD', 'UNDERLINE', 'HILIGHT', 'READLINE_ESCAPE')
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# mappings of terminal attribute enums to their ANSI escape encoding
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FG_ENCODING = dict([(list(Color)[i], str(30 + i)) for i in range(8)])
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BG_ENCODING = dict([(list(BgColor)[i], str(40 + i)) for i in range(8)])
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ATTR_ENCODING = {Attr.BOLD: '1', Attr.UNDERLINE: '4', Attr.HILIGHT: '7'}
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CSI = '\x1B[%sm'
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RESET = CSI % '0'
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def format(msg, *attr):
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"""
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Simple terminal text formatting using `ANSI escape sequences
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<https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_codes>`_.
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The following are some toolkits providing similar capabilities:
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* `django.utils.termcolors <https://github.com/django/django/blob/master/django/utils/termcolors.py>`_
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* `termcolor <https://pypi.python.org/pypi/termcolor>`_
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* `colorama <https://pypi.python.org/pypi/colorama>`_
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:param str msg: string to be formatted
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:param str attr: text attributes, this can be :data:`~stem.util.term.Color`,
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:data:`~stem.util.term.BgColor`, or :data:`~stem.util.term.Attr` enums
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and are case insensitive (so strings like 'red' are fine)
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:returns: **str** wrapped with ANSI escape encodings, starting with the given
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attributes and ending with a reset
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"""
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if DISABLE_COLOR_SUPPORT:
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return msg
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# if we have reset sequences in the message then apply our attributes
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# after each of them
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if RESET in msg:
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return ''.join([format(comp, *attr) for comp in msg.split(RESET)])
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encodings = []
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for text_attr in attr:
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text_attr, encoding = stem.util.str_tools._to_camel_case(text_attr), None
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encoding = FG_ENCODING.get(text_attr, encoding)
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encoding = BG_ENCODING.get(text_attr, encoding)
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encoding = ATTR_ENCODING.get(text_attr, encoding)
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if encoding:
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encodings.append(encoding)
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if encodings:
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prefix, suffix = CSI % ';'.join(encodings), RESET
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if Attr.READLINE_ESCAPE in attr:
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prefix = '\001%s\002' % prefix
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suffix = '\001%s\002' % suffix
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return prefix + msg + suffix
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else:
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return msg
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