Prototype of urwid coloring approach in topydo

urwidColoring.py

import re
import urwid

from string import ascii_uppercase

from topydo.lib.Color import Color
from topydo.lib.Config import config
from topydo.ui.TodoWidget import _to_urwid_color

if config().colors():
    project_color = _to_urwid_color(config().project_color())
    context_color = _to_urwid_color(config().context_color())
    metadata_color = _to_urwid_color(config().metadata_color())
    link_color = _to_urwid_color(config().link_color())
    neutral_color = _to_urwid_color(Color('NEUTRAL'))

PRJ_CON_PATTERN = r'\B(?:\+|@)(?:\S*\w)'
TAG_PATTERN = r'\b\S+:[^/\s]\S*\b'
URL_PATTERN = r'(?:^|\s)(?:\w+:){1}(?://\S+)'

todo_item = '(A) Tomorrow is +yet @another busy:day http://at.work lol'
pattern = r'|'.join([PRJ_CON_PATTERN, TAG_PATTERN, URL_PATTERN])
pattern = r'(' + pattern + r')'

palette = [
    ('project_color', 'default', 'default', 'default', project_color, 'default'),
    ('context_color', 'default', 'default', 'default', context_color, 'default'),
    ('metadata_color', 'default', 'default', 'default', metadata_color, 'default'),
    ('link_color', 'default', 'default', 'default', link_color, 'default'),
]

for C in ascii_uppercase:
    pri_color = _to_urwid_color(config().priority_color(C))
    palette.append((
        'pri_' + C, 'default', 'default', 'default', pri_color, 'default'
    ))

splitted = re.split(pattern, todo_item)
markup = []

for substring in splitted:
    if not substring:
        continue
    if re.match(TAG_PATTERN, substring):
        markup.append(('metadata_color', substring))
    elif re.match(URL_PATTERN, substring):
        markup.append(('link_color', substring))
    elif re.match(PRJ_CON_PATTERN, substring):
        if substring.startswith('+'):
            markup.append(('project_color', substring))
        else:
            markup.append(('context_color', substring))
    else:
        markup.append(substring)

txt = urwid.AttrMap(urwid.Text(markup), 'pri_A')
fill = urwid.Filler(txt, 'top')
screen = urwid.raw_display.Screen()
loop = urwid.MainLoop(fill, screen=screen)
screen.register_palette(palette)
screen.set_terminal_properties(256)
loop.run()