Merge pull request #331 from mdboom/mkpkg

Add a mkpkg tool to make new packages.

docs/new_packages.md

@@ -41,6 +41,13 @@ expect Conda packages to "just work" with Pyodide. (In the longer term, Pyodide
 may use conda as its packaging system, and this should hopefully ease that
 transition.)
 
+There is a helper tool that will generate a `meta.yaml` for packages on PyPI
+that will work for many pure Python packages. This tool will populate the latest
+version, download link and sha256 hash by querying PyPI. It doesn't currently
+handle package dependencies. To run it, do:
+
+`bin/pyodide mkpkg $PACKAGE_NAME`
+
 The supported keys in the `meta.yaml` file are described below.
 
 ### `package`

pyodide_build/__main__.py

@@ -5,6 +5,7 @@ from . import buildall
 from . import buildpkg
 from . import pywasmcross
 from . import serve
+from . import mkpkg
 
 
 def main():
@@ -14,7 +15,8 @@ def main():
     for command_name, module in (("buildpkg", buildpkg),
                                  ("buildall", buildall),
                                  ("pywasmcross", pywasmcross),
-                                 ("serve", serve)):
+                                 ("serve", serve),
+                                 ("mkpkg", mkpkg)):
         parser = module.make_parser(subparsers.add_parser(command_name))
         parser.set_defaults(func=module.main)
 

pyodide_build/mkpkg.py

+#!/usr/bin/env python3
+
+import argparse
+import json
+import os
+from pathlib import Path
+import urllib.request
+
+
+PACKAGES_ROOT = Path(__file__).parent.parent / 'packages'
+
+
+def make_package(package):
+    import yaml
+
+    url = f'https://pypi.org/pypi/{package}/json'
+
+    with urllib.request.urlopen(url) as fd:
+        json_content = json.load(fd)
+
+    entry = json_content['urls'][0]
+    download_url = entry['url']
+    sha256 = entry['digests']['sha256']
+    version = json_content['info']['version']
+
+    yaml_content = {
+        'package': {
+            'name': package,
+            'version': version
+        },
+        'source': {
+            'url': download_url,
+            'sha256': sha256
+        },
+        'test': {
+            'imports': [
+                package
+            ]
+        }
+    }
+
+    if not (PACKAGES_ROOT / package).is_dir():
+        os.makedirs(PACKAGES_ROOT / package)
+    with open(PACKAGES_ROOT / package / 'meta.yaml', 'w') as fd:
+        yaml.dump(yaml_content, fd, default_flow_style=False)
+
+
+def make_parser(parser):
+    parser.description = '''
+Make a new pyodide package. Creates a simple template that will work
+for most pure Python packages, but will have to be edited for more wv
+complex things.'''.strip()
+    parser.add_argument(
+        'package', type=str, nargs=1,
+        help="The package name on PyPI")
+    return parser
+
+
+def main(args):
+    package = args.package[0]
+    make_package(package)
+
+
+if __name__ == '__main__':
+    parser = make_parser(argparse.ArgumentParser())
+    args = parser.parse_args()
+    main(args)