cli: add headless command-line layer (bal_* commands for the daemon, cmdline entry point, manifest 'cmdline' support, offline controller tests)

bal/cli/plugin.py

@@ -0,0 +1,21 @@
+"""
+bal.cli.plugin
+==============
+
+The headless (command-line) entry point of the plugin.
+
+:class:`Plugin` subclasses :class:`bal.core.plugin_base.BalPlugin` without
+adding any Qt hooks or per-window state.  Electrum instantiates this class when
+the plugin runs with ``gui_name='cmdline'`` (the daemon loads
+``bal/cmdline.py``, which re-exports it), and it is the object injected as
+``plugin`` into every ``bal_*`` command by ``electrum.commands.plugin_command``.
+"""
+
+from ..core.plugin_base import BalPlugin
+
+
+class Plugin(BalPlugin):
+    """Minimal ``BasePlugin`` subclass for the command-line front-end."""
+
+    def __init__(self, parent, config, name):
+        BalPlugin.__init__(self, parent, config, name)