All: Add support for application plugins (#3257)

ReactNativeClient/lib/services/plugins/reducer.ts

@@ -0,0 +1,102 @@
+import { Draft } from 'immer';
+
+export interface ViewInfo {
+	view: any,
+	plugin: any,
+}
+
+interface PluginViewState {
+	id: string,
+	type: string,
+}
+
+interface PluginViewStates {
+	[key:string]: PluginViewState,
+}
+
+interface PluginState {
+	id:string,
+	views:PluginViewStates,
+}
+
+export interface PluginStates {
+	[key:string]: PluginState;
+}
+
+export interface State {
+	plugins: PluginStates,
+}
+
+export const stateRootKey = 'pluginService';
+
+export const defaultState:State = {
+	plugins: {},
+};
+
+export const utils = {
+	viewInfosByType: function(plugins:PluginStates, type:string):ViewInfo[] {
+		const output:ViewInfo[] = [];
+
+		for (const pluginId in plugins) {
+			const plugin = plugins[pluginId];
+			for (const viewId in plugin.views) {
+				const view = plugin.views[viewId];
+				if (view.type !== type) continue;
+
+				output.push({
+					plugin: plugin,
+					view: view,
+				});
+			}
+		}
+
+		return output;
+	},
+
+	commandNamesFromViews: function(plugins:PluginStates, toolbarType:string):string[] {
+		const infos = utils.viewInfosByType(plugins, 'toolbarButton');
+
+		return infos
+			.filter((info:ViewInfo) => info.view.location === toolbarType)
+			.map((info:ViewInfo) => info.view.commandName);
+	},
+};
+
+const reducer = (draft: Draft<any>, action:any) => {
+	if (action.type.indexOf('PLUGIN_') !== 0) return;
+
+	// All actions should be scoped to a plugin, except when adding a new plugin
+	if (!action.pluginId && action.type !== 'PLUGIN_ADD') throw new Error(`action.pluginId is required. Action was: ${JSON.stringify(action)}`);
+
+	try {
+		switch (action.type) {
+
+		case 'PLUGIN_ADD':
+
+			if (draft.pluginService.plugins[action.plugin.id]) throw new Error(`Plugin is already loaded: ${JSON.stringify(action)}`);
+			draft.pluginService.plugins[action.plugin.id] = action.plugin;
+			break;
+
+		case 'PLUGIN_VIEW_ADD':
+
+			draft.pluginService.plugins[action.pluginId].views[action.view.id] = { ...action.view };
+			break;
+
+		case 'PLUGIN_VIEW_PROP_SET':
+
+			draft.pluginService.plugins[action.pluginId].views[action.id][action.name] = action.value;
+			break;
+
+		case 'PLUGIN_VIEW_PROP_PUSH':
+
+			draft.pluginService.plugins[action.pluginId].views[action.id][action.name].push(action.value);
+			break;
+
+		}
+	} catch (error) {
+		error.message = `In plugin reducer: ${error.message} Action: ${JSON.stringify(action)}`;
+		throw error;
+	}
+};
+
+export default reducer;