[`application`] Added `application.install` action.

It can be used to programmatically install extensions.

docs/source/_ext/add_dependencies.py

@@ -12,10 +12,9 @@ base_path = os.path.abspath(
 
 sys.path.insert(0, base_path)
 
-from platypush.common.reflection import Integration  # noqa
-from platypush.utils import get_plugin_name_by_class, import_file  # noqa
-from platypush.utils.mock import auto_mocks  # noqa
-from platypush.utils.mock.modules import mock_imports  # noqa
+from platypush.common.reflection import Integration  # noqa: E402
+from platypush.utils import get_plugin_name_by_class  # noqa: E402
+from platypush.utils.mock import auto_mocks  # noqa: E402
 
 
 class IntegrationEnricher:

platypush/plugins/application/__init__.py

@@ -1,7 +1,15 @@
+import inspect
+import pathlib
+import subprocess
 from typing import Optional
+
 from platypush.commands import CommandStream, RestartCommand, StopCommand
+from platypush.common.db import override_definitions
 from platypush.config import Config
 from platypush.plugins import Plugin, action
+from platypush.utils import get_backend_class_by_name, get_plugin_class_by_name
+from platypush.utils.manifest import Manifest
+from platypush.utils.mock import auto_mocks
 
 
 class ApplicationPlugin(Plugin):
@@ -29,3 +37,34 @@ class ApplicationPlugin(Plugin):
         Restart the application.
         """
         CommandStream(self._ctrl_sock).write(RestartCommand())
+
+    @action
+    def install(self, extension: str):
+        """
+        Install the dependencies of an extension.
+
+        :param extension: Extension name. For plugins, it will be the plugin
+        name (e.g. ``light.hue`` or ``music.mpd``); for backend, the name will
+        be prefixed by ``backend.`` (e.g. ``backend.http`` or ``backend.tcp``).
+        """
+        getter = get_plugin_class_by_name
+        if extension.startswith('backend.'):
+            extension = extension[len('backend.') :]
+            getter = get_backend_class_by_name
+
+        with auto_mocks(), override_definitions():
+            ext = getter(extension)
+
+        assert ext, f'Could not find extension {extension}'
+        manifest_file = str(pathlib.Path(inspect.getfile(ext)).parent / 'manifest.yaml')
+        install_cmds = list(
+            Manifest.from_file(manifest_file).install.to_install_commands()
+        )
+
+        if not install_cmds:
+            self.logger.info('No extra requirements found for extension %s', extension)
+            return
+
+        for cmd in install_cmds:
+            self.logger.info('> %s', cmd)
+            subprocess.check_call(cmd, shell=True)