feat plugin/rand: support dice xdy

src/plugins/rand/index.ts

@@ -1,13 +1,11 @@
 import { App } from '@/types/app.js';
 import { PluginInit } from '@/types/plugin.js';
+import { getName } from '@/util/string.js';
 import { Message } from 'node-telegram-bot-api';
 
 function rand(app: App, msg: Message, msgTxt?: string) {
   const result = Math.floor(Math.random() * 101);
-  let username = msg.from?.first_name ? msg.from?.first_name : msg.from?.username;
-  if (msg.from?.last_name) {
-    username += ' ' + msg.from?.last_name;
-  }
+  const username = getName(msg.from);
   if (msgTxt) {
     void app.bot.sendMessage(msg.chat.id, `${username} ${msgTxt} 的概率是: ${result}%`);
   } else {
@@ -22,18 +20,34 @@ function randnoid(app: App, msg: Message, msgTxt?: string) {
   }
 }
 
+function dice(app: App, msg: Message, txt?: string) {
+  const sub = txt?.trim().match(/^(\d+)d(\d+)$/);
+  if (!sub || sub.length < 3) return void app.bot.sendMessage(msg.chat.id, '只支持xdy的格式');
+  const res = Array.from({ length: Number(sub[1]) }, () =>
+    Math.floor(Math.random() * Number(sub[2]))
+  );
+  const sum = res.reduce((a, b) => a + b);
+  void app.bot.sendMessage(msg.chat.id, `${getName(msg.from)} 掷出了${sum}: ${res.join(', ')}`);
+}
+
 export const init: PluginInit = (app) => {
   console.log('rand loaded!');
   app.registCommand({
     chat_type: 'all',
     command: 'rand',
     handle: rand,
-    description: 'rand [事件?]：投掷骰子',
+    description: 'rand [事件?]：投掷骰子, 结果是一个百分比',
   });
   app.registCommand({
     chat_type: 'all',
     command: 'randnoid',
     handle: randnoid,
-    description: 'randnoid [事件]：投掷骰子，但不显示投掷者名字',
+    description: 'randnoid [事件]：投掷骰子, 结果是一个百分比，但不显示投掷者名字',
+  });
+  app.registCommand({
+    chat_type: 'all',
+    command: 'dice',
+    handle: dice,
+    description: 'dice 配置: 投掷骰子, 以xdy的格式投掷x次y面骰子',
   });
 };