49 lines
1.4 KiB
Python
49 lines
1.4 KiB
Python
from urllib import parse as urlparse
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import click
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def validate_count(ctx, param, value):
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if value < 0 or value % 2 != 0:
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raise click.BadParameter("Should be a positive, even integer.")
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return value
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class URL(click.ParamType):
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name = "url"
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def convert(self, value, param, ctx):
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if not isinstance(value, tuple):
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value = urlparse.urlparse(value)
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if value.scheme not in ("http", "https"):
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self.fail(
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f"invalid URL scheme ({value.scheme}). Only HTTP URLs are allowed",
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param,
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ctx,
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)
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return value
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@click.command()
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@click.option(
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"--count", default=2, callback=validate_count, help="A positive even number."
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)
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@click.option("--foo", help="A mysterious parameter.")
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@click.option("--url", help="A URL", type=URL())
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@click.version_option()
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def cli(count, foo, url):
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"""Validation.
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This example validates parameters in different ways. It does it
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through callbacks, through a custom type as well as by validating
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manually in the function.
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"""
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if foo is not None and foo != "wat":
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raise click.BadParameter(
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'If a value is provided it needs to be the value "wat".',
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param_hint=["--foo"],
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)
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click.echo(f"count: {count}")
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click.echo(f"foo: {foo}")
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click.echo(f"url: {url!r}")
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