contrib/packaging/pyoxidizer.bzl

templater: introduce wrapper for smartset (API)

I want to add a template function which takes a revset as an argument:

  {somefunc(..., revset(...))}
                 ^^^^^^^^^^^
                 evaluates to a revslist

This wrapper will provide a method to get an underlying smartset. It should
also be good for performance since count(revset(...)) will no longer have to
fully consume the smartset for example, but that isn't the point of this
change.

# Instructions:
#
# 1. cargo install --version 0.5.0 pyoxidizer
# 2. cd /path/to/hg
# 3. pyoxidizer build --path contrib/packaging [--release]
# 4. Run build/pyoxidizer/<arch>/<debug|release>/app/hg
#
# If you need to build again, you need to remove the build/lib.* and
# build/temp.* directories, otherwise PyOxidizer fails to pick up C
# extensions. This is a bug in PyOxidizer.

ROOT = CWD + "/../.."

set_build_path(ROOT + "/build/pyoxidizer")

def make_exe():
    dist = default_python_distribution()

    code = "import hgdemandimport; hgdemandimport.enable(); from mercurial import dispatch; dispatch.run()"

    config = PythonInterpreterConfig(
        raw_allocator = "system",
        run_eval = code,
        # We want to let the user load extensions from the file system
        filesystem_importer = True,
        # We need this to make resourceutil happy, since it looks for sys.frozen.
        sys_frozen = True,
        legacy_windows_stdio = True,
    )

    exe = dist.to_python_executable(
        name = "hg",
        config = config,
    )

    # Use setup.py install to build Mercurial and collect Python resources to
    # embed in the executable.
    resources = dist.setup_py_install(ROOT)
    exe.add_python_resources(resources)

    return exe

def make_install(exe):
    m = FileManifest()

    # `hg` goes in root directory.
    m.add_python_resource(".", exe)

    templates = glob(
        include=[ROOT + "/mercurial/templates/**/*"],
        strip_prefix = ROOT + "/mercurial/",
    )
    m.add_manifest(templates)

    return m

register_target("exe", make_exe)
register_target("app", make_install, depends = ["exe"], default = True)

resolve_targets()