build backend: use custom wrapper around flit

For pkgcore we need to run multiple preparations of generating files
before creating sdist or wheel. Flit is a very simple and nice build
backend, much more than setuptools.

Also migrate to use snakeoil.dist sphinx extension for generating man
and html, to remove various logic from `doc/conf.py`.

Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/py_build.py b/py_build.py
new file mode 100644
index 0000000..f224a1b
--- /dev/null
+++ b/py_build.py
@@ -0,0 +1,44 @@
+from functools import partial
+from pathlib import Path
+
+from flit_core import buildapi
+
+
+def write_verinfo(cleanup_files):
+    cleanup_files.append(path := Path.cwd() / "src/pkgdev/_verinfo.py")
+    path.parent.mkdir(parents=True, exist_ok=True)
+    print(f"generating version info: {path}")
+    from snakeoil.version import get_git_version
+    path.write_text(f"version_info={get_git_version(Path.cwd())!r}")
+
+
+def prepare_pkgcore(callback):
+    cleanup_files = []
+    try:
+        write_verinfo(cleanup_files)
+
+        return callback()
+    finally:
+        for path in cleanup_files:
+            try:
+                path.unlink()
+            except OSError:
+                pass
+
+
+def build_wheel(wheel_directory, config_settings=None, metadata_directory=None):
+    """Builds a wheel, places it in wheel_directory"""
+    callback = partial(buildapi.build_wheel, wheel_directory, config_settings, metadata_directory)
+    return prepare_pkgcore(callback)
+
+
+def build_editable(wheel_directory, config_settings=None, metadata_directory=None):
+    """Builds an "editable" wheel, places it in wheel_directory"""
+    callback = partial(buildapi.build_editable, wheel_directory, config_settings, metadata_directory)
+    return prepare_pkgcore(callback)
+
+
+def build_sdist(sdist_directory, config_settings=None):
+    """Builds an sdist, places it in sdist_directory"""
+    callback = partial(buildapi.build_sdist, sdist_directory, config_settings)
+    return prepare_pkgcore(callback)