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from urllib import parse as urlparse
import click
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(
f"invalid URL scheme ({value.scheme}). Only HTTP URLs are allowed",
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(f"count: {count}")
click.echo(f"foo: {foo}")
click.echo(f"url: {url!r}")
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