def convert_flip(ctx, param, value):
if value is None:
return
value = value.lower()
if value in ('lr', 'leftright'):
return (Image.FLIP_LEFT_RIGHT, 'left to right')
if value in ('tb', 'topbottom', 'upsidedown', 'ud'):
return (Image.FLIP_LEFT_RIGHT, 'top to bottom')
raise click.BadParameter('invalid flip "%s"' % value)
def convert_rotation(ctx, param, value):
if value is None:
return
value = value.lower()
if value in ('90', 'r', 'right'):
return (Image.ROTATE_90, 90)
if value in ('180', '-180'):
return (Image.ROTATE_180, 180)
if value in ('-90', '270', 'l', 'left'):
return (Image.ROTATE_270, 270)
raise click.BadParameter('invalid rotation "%s"' % value)
def cli(count, foo, url):
"""Validation.
This example validates parameters in different ways. It does it
through callbacks, through a custom type as well as by validating
manually in the function.
"""
if foo is not None and foo != 'wat':
raise click.BadParameter(
'If a value is provided it needs to be the '
'value "wat".',
param_hint=['--foo'])
click.echo('count: %s' % count)
click.echo('foo: %s' % foo)
click.echo('url: %s' % repr(url))
def validate_pos_int(ctx, param, value):
if value < 0:
raise click.BadParameter('Value needs to be positive')
return value
def validate_count(ctx, param, value):
if value < 0 or value % 2 != 0:
raise click.BadParameter('Should be a positive, even integer.')
return value