build: Port from MANIFEST.in to setuptools_scm

Using `setuptools_scm` allows us to reliably ensure that all files in
git are in the sdist, which avoids problems caused by occasionally
forgetting to update `MANIFEST.in` when adding a new directory.

`MANIFEST.in` still needs to be kept (in a reduced form) because there
are a few files needed by webpack and by kolibri-installer-android which
are only created at dist time, and exist outside setuptools.

References:
 - https://github.com/pypa/setuptools_scm#readme
 - https://pip.pypa.io/en/stable/reference/build-system/pyproject-toml/
 - pypa/setuptools-scm#190
 - https://packaging.python.org/en/latest/guides/using-manifest-in/

Signed-off-by: Philip Withnall <[email protected]>

#647

MANIFEST.in

@@ -1,19 +1,10 @@
-include AUTHORS.rst
-include CONTRIBUTING.rst
-include CHANGELOG.rst
-include LICENSE
-include README.rst
-include kolibri_explore_plugin/VERSION
-include kolibri_explore_plugin/content_types.json
-recursive-exclude kolibri_explore_plugin/* *pyc
-recursive-exclude kolibri_explore_plugin/assets *
-recursive-include kolibri_explore_plugin/migrations *
-recursive-include kolibri_explore_plugin/management *
-recursive-include kolibri_explore_plugin/templates *.*
-recursive-include kolibri_explore_plugin/static *.*
-recursive-exclude kolibri_explore_plugin/static/collections *
-recursive-include kolibri_explore_plugin/build *.json
-recursive-include kolibri_explore_plugin/locale *.mo
-recursive-include kolibri_explore_plugin/locale *.json
-recursive-include kolibri_explore_plugin/vendor *.py
+# webpack build-info is needed at runtime, but it’s only built at build time
+# by yarn, so setuptools doesn’t know about it.
+include kolibri_explore_plugin/static/build-info.json
+
+# This is the dist form of welcomeScreen, which is not committed to git (but its
+# source in packages/welcome-screen, is). It needs to be in the dist tarball
+# because it’s consumed by kolibri-installer-android to show a welcome screen,
+# and kolibri-installer-android consumes the kolibri-explore-plugin wheel
+# directly.
 recursive-include kolibri_explore_plugin/welcomeScreen *.*

pyproject.toml

@@ -1,3 +1,11 @@
+[build-system]
+# As per https://peps.python.org/pep-0518, list only the minimal dependencies
+# needed here to get the build started. All other dependencies and built
+# dependencies should be listed in [packages]/[dev-packages] in Pipfile.
+# If changing the requires list here, please also update it in [dev-packages]
+# in Pipfile.
+requires = ["build", "setuptools>=45", "setuptools_scm[toml]>=6.2"]
+
 [tool.black]
 line-length = 79
 include = '\.pyi?$'