feat: restructure plugin and options in listconfigs

This will change the command `listconfigs` output in several ways:

 - Deprecated the duplicated "plugin" JSON output by replacing it with
 - a "plugins" array with substructures for each plugin with:
 - path, name and their options

Changelog-Changed: JSON-RPC: `listconfigs` now structures plugins and include their options
Changelog-Deprecated: JSON-RPC: `listconfigs` duplicated "plugin" paths

lightningd/plugin.c

@@ -1086,9 +1086,49 @@ void json_add_opt_plugins(struct json_stream *response,
 			  const struct plugins *plugins)
 {
 	struct plugin *p;
+	struct plugin_opt *opt;
+	const char *plugin_name;
+	const char *opt_name;
+
+	/* DEPRECATED: duplicated JSON "plugin" entries */
+	if (deprecated_apis) {
+		list_for_each(&plugins->plugins, p, list) {
+			json_add_string(response, "plugin", p->cmd);
+		}
+	}
+
+	/* we output 'plugins' and their options as an array of substructures */
+	json_array_start(response, "plugins");
 	list_for_each(&plugins->plugins, p, list) {
-		json_add_string(response, "plugin", p->cmd);
+		json_object_start(response, NULL);
+		json_add_string(response, "path", p->cmd);
+
+		/* FIXME: use executables basename until plugins can define their names */
+		plugin_name = path_basename(NULL, p->cmd);
+		json_add_string(response, "name", plugin_name); // basename(p->cmd));
+		tal_free(plugin_name);
+
+		if (!list_empty(&p->plugin_opts)) {
+			json_object_start(response, "options");
+			list_for_each(&p->plugin_opts, opt, list)
+			{
+				/* Trim the `--` that we added before */
+				opt_name = opt->name + 2;
+				if (opt->value->as_bool) {
+					json_add_bool(response, opt_name, opt->value->as_bool);
+				} else if (opt->value->as_int) {
+					json_add_bool(response, opt_name, opt->value->as_int);
+				} else if (opt->value->as_str) {
+					json_add_string(response, opt_name, opt->value->as_str);
+				} else {
+					json_add_null(response, opt_name);
+				}
+			}
+			json_object_end(response);
+		}
+		json_object_end(response);
 	}
+	json_array_end(response);
 }
 
 /**

tests/test_misc.py

@@ -745,12 +745,25 @@ def test_listconfigs(node_factory, bitcoind, chainparams):
 
     # Test one at a time.
     for c in configs.keys():
-        if c.startswith('#'):
+        if c.startswith('#') or c.startswith('plugins'):
             continue
         oneconfig = l1.rpc.listconfigs(config=c)
         assert(oneconfig[c] == configs[c])
 
 
+def test_listconfigs_plugins(node_factory, bitcoind, chainparams):
+    l1 = node_factory.get_node()
+
+    # assert that we have pay plugin and that plugins have a name and path
+    configs = l1.rpc.listconfigs()
+    assert configs['plugins']
+    assert len([p for p in configs['plugins'] if p['name'] == "pay"]) == 1
+    for p in configs['plugins']:
+        assert p['name'] and len(p['name']) > 0
+        assert p['path'] and len(p['path']) > 0
+        assert os.path.isfile(p['path']) and os.access(p['path'], os.X_OK)
+
+
 def test_multirpc(node_factory):
     """Test that we can do multiple RPC without waiting for response"""
     l1 = node_factory.get_node()