Log message:
url2pkg: extract code for analyzing the distfile URL

In a few commits, this will allow url2pkg to be run from a category
directory, thereby omitting the need to create the package directory
manually.

No functional change.

Log message:
url2pkg: add type annotation for usage

Log message:
url2pkg: improve MASTER_SITES and HOMEPAGE for PyPI packages

https://mail-index.netbsd.org/tech-pkg/2021/12/31/msg025908.html

Bump version.

Log message:
url2pkg: test current behavior for PyPI downloads

Log message:
url2pkg: remove interactivity

In the first phase, url2pkg generates a minimal package Makefile, barely
enough for downloading the distfile from the given URL.  That part runs
fully automated in almost all cases, so there is no need to invoke the
editor at this point.

After adjusting the package Makefile based on the downloaded and
extracted distfile, url2pkg has done its job, so there is no reason to
run the editor there as well.

Bump version.

Log message:
pkgtools/url2pkg: update to 21.3.0

Changes since 21.1.0:

When creating a package from a GitHub archive URL, make the generated
package simpler and place the distfile in the main directory instead of
using DIST_SUBDIR.

Log message:
pkgtools/url2pkg: add test for overly complicated package definition

Seen in wip/netmask.

Log message:
url2pkg: fix dependency pattern for buildlink3 Python dependencies

This includes the PYPKGPREFIX for Python dependencies, whether or not
they use buildlink3.

Log message:
url2pkg: generate proper package name for Python dependencies

Reported by Brook Milligan via private mail.

Log message:
url2pkg: break long lines, no functional change