Convenience functions for ANSI terminal colour sequences [color].

Latest release 20220227:

• New TerminalColors class parsing /etc/terminal-colors.d and honouring $*_COLORS.
• New colour_escape(code) to make the escape sequence for a colour code.
• New COLOUR_CODES mapping of known colour names.

Mapping and function for adding ANSI terminal colour escape sequences to strings for colour highlighting of output.

Function colour_escape(code)

Return the ANSI escape sequence to activate the colour code. code may be an int or a str which indexes COLOUR_CODES.

Function colourise(s, colour=None, uncolour=None)

Return a string enclosed in colour-on and colour-off ANSI sequences.

• colour: names the desired ANSI colour.
• uncolour: may be used to specify the colour-off colour; the default is 'normal' (from NORMAL_COLOUR).

Function colourise_patterns(s, patterns, default_colour=None)

Colourise a string s according to patterns.

Parameters:

• s: the string.
• patterns: a sequence of patterns.
• default_colour: if a string pattern has no colon, or starts with a colon, use this colour; default "cyan" (from DEFAULT_HIGHLIGHT).

Each pattern may be:

• a string of the form "[colour]:regexp"
• a string containing no colon, taken to be a regexp
• a tuple of the form (colour,regexp)
• a regexp object

Returns the string with ANSI colour escapes embedded.

Function env_no_color(environ=None)

Test the $NO_COLOR environment variable per the specification at https://no-color.org/

Function make_pattern(pattern, default_colour=None)

Convert a pattern specification into a (colour,regexp) tuple.

Parameters:

• pattern: the pattern to parse
• default_colour: the highlight colour, default "cyan" (from DEFAULT_HIGHLIGHT).

Each pattern may be:

• a string of the form "[colour]:regexp"
• a string containing no colon, taken to be a regexp
• a tuple of the form (colour,regexp)
• a regexp object

Function make_patterns(patterns, default_colour=None)

Convert an iterable of pattern specifications into a list of (colour,regexp) tuples.

Parameters:

• patterns: an iterable of patterns to parse
• default_colour: the highlight colour, default "cyan" (from DEFAULT_HIGHLIGHT).

Each pattern may be:

• a string of the form "[colour]:regexp"
• a string containing no colon, taken to be a regexp
• a tuple of the form (colour, regexp)
• a regexp object

Class TerminalColors

A parser for /etc/terminal-colors.d' files.

Method TerminalColors.__init__(self, util_name=None, term_name=None, type_name=None, colors_dirpath=None, envvar=None): Initialise the TerminalColors instance.

Parameters:

• util_name: optional utility name, default from sys.argv[0]
• term_name: optional terminal name, default from the $TERM envvar
• type_name: optional type name, default 'enable'
• colors_dirpath: optional specification files directory path, default from TerminalColors.TERMINAL_COLORS_D
• envvar: environment variable to override matches; the default util_name+'_COLORS', thus $LS_COLORS if util_name=='ls'. That may be the value False if no environment variable should be an override.

Method TerminalColors.convert_sequence(sequence): Convert a colour specification to an escape sequence.

Method TerminalColors.find_specfile(self): Locate the most specific specification file matching our criteria. Return None if no file matches.

Property TerminalColors.mapping: The mapping of name to escape sequence.

Method TerminalColors.scan(self, path=None): Scan the colour specification in path and yield (name,escape_sequence) tuples.

Release Log

Release 20220227:

• New TerminalColors class parsing /etc/terminal-colors.d and honouring $*_COLORS.
• New colour_escape(code) to make the escape sequence for a colour code.
• New COLOUR_CODES mapping of known colour names.

Release 20200729:

• New env_no_color() test function honouring the $NO_COLOUR envvar per https://no-color.org/
• colourise: get the "normal" default from the global NORMAL_COLOUR.

Release 20180726: greater markdowning of docstrings

Release 20180725.2: some markdown, still release testing

Release 20180725.1: Trivial changes, testing release process.

Release 20180725: rename second colourise function to colourise_patterns, was shadowing things

Release 20180422:

• New function colourise to colour strings with regexp matches.
• New helper functions make_pattern and make_patterns to construct (colour, regexp)s from specifications.
• New public names NORMAL_COLOUR and DEFAULT_HIGHLIGHT.

Release 20170902: Release metadata changes.

Release 20160828: Add PyPI category, other minor tweaks.

Release 20150112: PyPI release.

Release 20150107: first standalone pypi release