Use jupyter-packaging for npm build

dev-requirements.txt

@@ -1,3 +1,4 @@
+jupyter_packaging>=0.10
 six
 pytest
 pytest-cov

pyproject.toml

@@ -0,0 +1,7 @@
+[build-system]
+requires = [
+  "build",
+  "jupyter_packaging>=0.10",
+  "setuptools",
+]
+build-backend = "setuptools.build_meta"

setup.py

@@ -1,6 +1,20 @@
+from jupyter_packaging import wrap_installers, npm_builder
 from setuptools import find_packages, setup
 from distutils.util import convert_path
-import subprocess
+import os.path
+
+HERE = os.path.abspath(os.path.dirname(__file__))
+
+# Representative files that should exist after a successful build
+jstargets = [
+    os.path.join(HERE, "nbgitpuller", "static", "dist", "bundle.js"),
+]
+
+# https://github.com/jupyter/jupyter-packaging/blob/0.10.4/README.md#as-a-build-requirement
+jsdeps = npm_builder(build_cmd="webpack")
+cmdclass = wrap_installers(
+    pre_develop=jsdeps, pre_dist=jsdeps,
+    ensured_targets=jstargets, skip_if_exists=jstargets)
 
 # Imports __version__, reference: https://stackoverflow.com/a/24517154/2220152
 ns = {}
@@ -9,16 +23,14 @@
     exec(ver_file.read(), ns)
 __version__ = ns['__version__']
 
-subprocess.check_call(['npm', 'install'])
-subprocess.check_call(['npm', 'run', 'webpack'])
-
 setup(
     name='nbgitpuller',
     version=__version__,
     url='https://github.com/jupyterhub/nbgitpuller',
     license='3-clause BSD',
     author='Peter Veerman, YuviPanda',
     author_email='[email protected]',
+    cmdclass=cmdclass,
     description='Notebook Extension to do one-way synchronization of git repositories',
     long_description=open('README.md').read(),
     long_description_content_type='text/markdown',