fix: output help message when parameter is empty

src/i18n/en-US/macrodict.yml

@@ -10,6 +10,7 @@ commands:
       lang: Specify the language of the output.
 
     messages:
+      no_macro: 'Error: Please enter the command with macro.'
       wrong_language: 'Invalid language {0}. Trying to search macros with default language {1}.'
       not_found_puppeteer: 'Plugin puppeteer was not found, could not render text commands.'
       not_found_macro: 'Macro not found.'

src/i18n/zh-CN/macrodict.yml

@@ -12,6 +12,7 @@ commands:
       textMode: 输出为文本模式
 
     messages:
+      no_macro: 错误：使用指令时应当传递宏名称。
       wrong_language: '不存在语言 {0}，将采用默认语言 {1} 进行搜索。'
       not_found_puppeteer: '未找到 koishi-plugin-puppeteer 插件，无法渲染宏指令。'
       not_found_macro: '找不到宏指令。'

src/index.ts

@@ -1,4 +1,4 @@
-import { Context } from 'koishi'
+import { Context, h } from 'koishi'
 
 import { Config } from './config'
 import i18n from './i18n'
@@ -29,6 +29,9 @@ export async function apply(ctx: Context, config: Config): Promise<void> {
     .channelFields(['macrodict'])
     .option('lang', '-l <language:string>')
     .action(async ({ session, options }, macro) => {
+      if (!macro?.trim?.()) {
+        return h('message', [h('p', session?.text('.no_macro')), h('br'), h('execute', 'help macrodict')])
+      }
       let lang = (options?.lang as Locale) ?? config.defaultLanguage
       if (!lang || !locales.includes(lang)) {
         session?.sendQueued(session.text('.wrong_language', [lang, config.defaultLanguage]))