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automation: support building Windows wheels for Python 3.7 and 3.8...
automation: support building Windows wheels for Python 3.7 and 3.8 The time has come to support Python 3 on Windows. Let's teach our automation code to produce Windows wheels for Python 3.7 and 3.8. We could theoretically support 3.5 and 3.6. But I don't think it is worth it. People on Windows generally use the Mercurial installers, not wheels. And I'd prefer we limit variability and not have to worry about supporting earlier Python versions if it can be helped. As part of this, we change the invocation of pip to `python.exe -m pip`, as this is what is being recommended in Python docs these days. And it seemed to be required to avoid a weird build error. Why, I'm not sure. But it looks like pip was having trouble finding a Visual Studio files when invoked as `pip.exe` but not when using `python.exe -m pip`. Who knows. Differential Revision: https://phab.mercurial-scm.org/D8478
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Oxidized Mercurial

This project provides a Rust implementation of the Mercurial (hg)
version control tool.

Under the hood, the project uses
PyOxidizer to embed a Python
interpreter in a binary built with Rust. At run-time, the Rust fn main()
is called and Rust code handles initial process startup. An in-process
Python interpreter is started (if needed) to provide additional
functionality.

Building

This project currently requires an unreleased version of PyOxidizer
(0.7.0-pre). For best results, build the exact PyOxidizer commit
as defined in the pyoxidizer.bzl file:

$ git clone https://github.com/indygreg/PyOxidizer.git
$ cd PyOxidizer
$ git checkout <Git commit from pyoxidizer.bzl>
$ cargo build --release

Then build this Rust project using the built pyoxidizer executable::

$ /path/to/pyoxidizer/target/release/pyoxidizer build

If all goes according to plan, there should be an assembled application
under build/<arch>/debug/app/ with an hg executable:

$ build/x86_64-unknown-linux-gnu/debug/app/hg version
Mercurial Distributed SCM (version 5.3.1+433-f99cd77d53dc+20200331)
(see https://mercurial-scm.org for more information)

Copyright (C) 2005-2020 Matt Mackall and others
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Running Tests

To run tests with a built hg executable, you can use the --with-hg
argument to run-tests.py. But there's a wrinkle: many tests run custom
Python scripts that need to import modules provided by Mercurial. Since
these modules are embedded in the produced hg executable, a regular
Python interpreter can't access them! To work around this, set PYTHONPATH
to the Mercurial source directory. e.g.:

$ cd /path/to/hg/src/tests
$ PYTHONPATH=`pwd`/.. python3.7 run-tests.py \
    --with-hg `pwd`/../rust/hgcli/build/x86_64-unknown-linux-gnu/debug/app/hg