event and timer helpers

src/index.js

@@ -6,6 +6,8 @@ const {resolve} = require("path");
 const config = require("../config.json");
 const Command = require("./lib/command.js");
 const CommandDispatcher = require("./lib/commandDispatcher.js");
+const events = require("./lib/events.js");
+const timer = require("./lib/timer.js");
 
 const bot = new Eris(config.token, {
   defaultImageFormat: "png",
@@ -32,6 +34,8 @@ global.hf = {
   config,
   commands,
   registerCommand,
+  events,
+  timer,
 };
 
 for (const file of fs.readdirSync(resolve(__dirname, "modules"))) {

src/lib/events.js

@@ -0,0 +1,43 @@
+const logger = require("npmlog");
+
+const eventTable = {};
+
+function getTable() {
+  return eventTable;
+}
+
+function add(event, identifier, callback) {
+  if (eventTable[event] == null) eventTable[event] = {};
+
+  if (eventTable[event][identifier] != null) {
+    hf.bot.off(event, eventTable[event][identifier]);
+  }
+
+  function wrapper() {
+    try {
+      callback.apply(this, arguments);
+    } catch (error) {
+      logger.error(
+        "hf:event",
+        `Event "${event}:${identifier}" failed: ${error}`
+      );
+    }
+  }
+
+  eventTable[event][identifier] = wrapper;
+  hf.bot.on(event, wrapper);
+}
+
+function remove(event, identifier) {
+  if (eventTable[event] == null) eventTable[event] = {};
+
+  if (eventTable[event][identifier] != null) {
+    hf.bot.off(event, eventTable[event][identifier]);
+  }
+}
+
+module.exports = {
+  getTable,
+  add,
+  remove,
+};

src/lib/timer.js

@@ -0,0 +1,35 @@
+const logger = require("npmlog");
+
+const timerTable = {};
+
+function getTable() {
+  return timerTable;
+}
+
+function add(identifier, callback, delay) {
+  if (timerTable[identifier] != null) {
+    clearInterval(timerTable[identifier]);
+  }
+
+  function wrapper() {
+    try {
+      callback();
+    } catch (error) {
+      logger.error("hf:timer", `Timer "${identifier}" failed: ${error}`);
+    }
+  }
+
+  timerTable[identifier] = setInterval(wrapper, delay);
+}
+
+function remove(identifier) {
+  if (timerTable[identifier] != null) {
+    clearInterval(timerTable[identifier]);
+  }
+}
+
+module.exports = {
+  getTable,
+  add,
+  remove,
+};