Add pre-commit hook to generate external dependencies

.pre-commit-hooks.yaml

@@ -32,3 +32,10 @@
   pass_filenames: false
   language: python
   files: (__manifest__\.py|__openerp__\.py|__terp__\.py)$
+
+- id: oca-gen-external-dependencies
+  name: Generate requirements.txt for an addons directory
+  entry: oca-gen-external-dependencies
+  language: python
+  pass_filenames: false
+  files: (__manifest__\.py|__openerp__\.py|__terp__\.py|setup\.py|pyproject\.toml)$

setup.py

@@ -38,6 +38,8 @@
         "selenium",
         "twine",
         "wheel",
+        "setuptools-odoo",  # for oca-gen-external-dependencies
+        "whool",  # for oca-gen-external-dependencies
     ],
     python_requires=">=3.6",
     classifiers=[
@@ -64,6 +66,7 @@
             "oca-publish-modules = tools.publish_modules:main",
             "oca-gen-addon-readme = tools.gen_addon_readme:gen_addon_readme",
             "oca-gen-addon-icon = tools.gen_addon_icon:gen_addon_icon",
+            "oca-gen-external-dependencies = tools.gen_external_dependencies:main",
             "oca-towncrier = tools.oca_towncrier:oca_towncrier",
             "oca-create-migration-issue = tools.create_migration_issue:main",
             "oca-update-pre-commit-excluded-addons = "

tools/gen_external_dependencies.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+"""Generate requirements.txt with external dependencies of Odoo addons."""
+
+import os
+import subprocess
+import sys
+from itertools import chain
+from pathlib import Path
+
+
+def main():
+    projects = chain(
+        Path.glob(Path.cwd(), "*/pyproject.toml"),
+        Path.glob(Path.cwd(), "setup/*/setup.py"),
+    )
+
+    env = os.environ.copy()
+    env.update(
+        {
+            # for better performance
+            "WHOOL_POST_VERSION_STRATEGY_OVERRIDE": "none",
+            "SETUPTOOLS_ODOO_POST_VERSION_STRATEGY_OVERRIDE": "none",
+        }
+    )
+
+    result = subprocess.run(
+        [
+            sys.executable,
+            "-m",
+            "pyproject_dependencies",
+            "--no-isolation",  # whool and setuptools Odoo must be preinstalled
+            "--ignore-build-errors",  # ignore uninstallable modules etc
+            "--name-filter",
+            r"^(odoo$|odoo\d*-addon-)",  # filter out odoo and odoo addons
+            *projects,
+        ],
+        env=env,
+        check=False,
+        stdout=subprocess.PIPE,
+        text=True,
+    )
+
+    if result.returncode != 0:
+        sys.exit(result.returncode)
+
+    requirements = result.stdout
+
+    requirements_path = Path("requirements.txt")
+    if requirements:
+        with requirements_path.open("w") as f:
+            f.write("# generated from manifests external_dependencies\n")
+            f.write(requirements)
+    else:
+        if requirements_path.exists():
+            requirements_path.unlink()
+
+
+if __name__ == "__main__":
+    main()