"""

Sets up the terminal color scheme.

"""

import sys

from django.utils import termcolors

def supports_color():

    """

    Returns True if the running system's terminal supports color, and False

    otherwise.

    """

    unsupported_platform = (sys.platform in ('win32', 'Pocket PC'))

    # isatty is not always implemented, #6223.

    is_a_tty = hasattr(sys.stdout, 'isatty') and sys.stdout.isatty()

    if unsupported_platform or not is_a_tty:

        return False

    return True

def color_style():

    """Returns a Style object with the Django color scheme."""

    if not supports_color():

        return no_style()

    class dummy: pass

    style = dummy()

    style.ERROR = termcolors.make_style(fg='red', opts=('bold',))

    style.ERROR_OUTPUT = termcolors.make_style(fg='red', opts=('bold',))

    style.NOTICE = termcolors.make_style(fg='red')

    style.SQL_FIELD = termcolors.make_style(fg='green', opts=('bold',))

    style.SQL_COLTYPE = termcolors.make_style(fg='green')

    style.SQL_KEYWORD = termcolors.make_style(fg='yellow')

    style.SQL_TABLE = termcolors.make_style(opts=('bold',))

    return style

def no_style():

    """Returns a Style object that has no colors."""

    class dummy:

        def __getattr__(self, attr):

            return lambda x: x

    return dummy()