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import click
try:
from urllib import parser as urlparse
except ImportError:
import urlparse
def validate_count(ctx, param, value):
if value < 0 or value % 2 != 0:
raise click.BadParameter('Should be a positive, even integer.')
return value
class URL(click.ParamType):
name = 'url'
def convert(self, value, param, ctx):
if not isinstance(value, tuple):
value = urlparse.urlparse(value)
if value.scheme not in ('http', 'https'):
self.fail('invalid URL scheme (%s). Only HTTP URLs are '
'allowed' % value.scheme, param, ctx)
return value
@click.command()
@click.option('--count', default=2, callback=validate_count,
help='A positive even number.')
@click.option('--foo', help='A mysterious parameter.')
@click.option('--url', help='A URL', type=URL())
@click.version_option()
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))
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