A TextMate command that converts rgb(x, y, z) to #pqr

css_colour_convert.py

#!/usr/bin/env python

# See a demo: <http://www.vimeo.com/4195472>
# Here are the settings: <http://www.quicksnapper.com/sneeu/image/css-colour-convert-settings>

import os
import re
import sys


_HEX_COLOUR_RE = re.compile('#[0-9a-f]{3}|[0-9a-f]{6}', re.IGNORECASE)


def _split_list(my_list, sublist_length):
    """
    Splits a list of length n into a list of lists of length sublist_length.
    """
    list_of_lists = []
    for i in xrange(0, len(my_list), sublist_length):
        list_of_lists.append(my_list[i:i + sublist_length])
    return list_of_lists


def _convert_3_to_6(text):
    """
    Expands a three digit hex code into a six digit hex code.

    >>> _convert_3_to_6('333')
    333333
    >>> _convert_3_to_6('888')
    888888
    """
    r = ''
    for c in text:
        r = r + c + c
    return r


def _convert_6_to_3(text):
    """
    Potentially converts a 6 digit hex code into a three digit hex code.

    >>> _convert_6_to_3('665544')
    654
    >>> _convert_6_to_3('665543')
    665543
    """
    r = ''
    for i in range(0, len(text), 2):
        if text[i] == text[i + 1]:
            r += text[i]
        else:
            return text
    return r


def hex_to_ints(h):
    """Converts a list of hex values, into a list of base 10 values."""
    return [str(int(x, 16)) for x in h]


def ints_to_hex(i):
    """Converts a list of base 10 values, into a list of hex values."""
    return [hex(int(n))[2:].rjust(2, '0') for n in i]


def bidi_colour(text):
    """
    Changes a colour from a hex code to an rgb(), or an rgb() to a hex colour
    code.

    >>> bidi_colour(bidi_colour('#333'))
    #333
    >>> bidi_colour(bidi_colour('#123456'))
    #123456
    >>> bidi_colour(bidi_colour('#665544'))
    #654
    """
    if _HEX_COLOUR_RE.match(text):
        text = text[1:].strip()
        if len(text) == 3:
            text = _convert_3_to_6(text)
        text = _split_list(text, len(text) / 3)
        colour = 'rgb(%s)' % ', '.join(hex_to_ints(text))
    elif text.lower().startswith('rgb('):
        colour = '#' + _convert_6_to_3(''.join(ints_to_hex(
            text.lower().replace('rgb(', '').replace(')', '').split(','))))
    else:
        colour = text
    return colour


if __name__ == '__main__':
    sys.stdout.write(bidi_colour(os.environ['TM_SELECTED_TEXT']))