feat: add image bed command

src/main/kotlin/cn/rtast/fancybot/commands/parse/ImageURLCommand.kt

@@ -10,21 +10,30 @@ package cn.rtast.fancybot.commands.parse
 import cn.rtast.rob.entity.GetMessage
 import cn.rtast.rob.entity.GroupMessage
 import cn.rtast.rob.enums.ArrayMessageType
-import cn.rtast.rob.util.ob.MessageChain
 
 object ImageURLCommand {
-    suspend fun callback(groupMessage: GroupMessage, message: GetMessage.Data) {
-        val msg = MessageChain.Builder()
-            .addReply(message.messageId)
-            .addText("哈哈哈哈图片来咯~")
-            .addNewLine()
-        val image = message.message.find { it.type == ArrayMessageType.image }
-        if (image == null) {
-            val gif = message.message.find { it.type == ArrayMessageType.mface }!!
-            msg.addText(gif.data.url!!)
-        } else {
-            msg.addText(image.data.file!!)
+
+    fun getImageUrl(message: GetMessage.Data): String? {
+        try {
+            val image = message.message.find { it.type == ArrayMessageType.image }
+            val url = if (image == null) {
+                val gif = message.message.find { it.type == ArrayMessageType.mface }!!
+                gif.data.url!!
+            } else {
+                image.data.file!!
+            }
+            return url
+        } catch (_: NullPointerException) {
+            return null
+        }
+    }
+
+    suspend fun callback(groupMessage: GroupMessage, message: GetMessage.Data) {
+        val url = getImageUrl(message)
+        if (url == null) {
+            groupMessage.reply("这个消息里没有图片呢!")
+        } else {
+            groupMessage.reply(url)
         }
-        groupMessage.reply(msg.build())
     }
 }