chore: improve use experience

src/main/kotlin/cn/rtast/fancybot/FancyBot.kt

@@ -65,6 +65,8 @@ class FancyBot : OneBotListener {
         val messageId = message.messageId
         println("$sender($senderId: $groupId >>> $messageId): $msg")
 
+        AsciiArtCommand.callback(message)
+
         if (message.rawMessage.startsWith("https://github.com/") || message.rawMessage.startsWith("git@github.com:")) {
             GitHubParseCommand.parse(this, message)
         }

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

@@ -22,10 +22,12 @@ import javax.imageio.ImageIO
 import kotlin.math.roundToInt
 
 class AsciiArtCommand : BaseCommand() {
-    override val commandNames = listOf("/ascii")
+    override val commandNames = listOf("/ascii", "/asc")
 
-    private val fontSize = 12
-    private val font = Font("Monospaced", Font.PLAIN, fontSize)
+    companion object {
+        private const val FONT_SIZE = 12
+        private val font = Font("Monospaced", Font.PLAIN, FONT_SIZE)
+        val waitingList = mutableListOf<Long>()
 
         private fun BufferedImage.convertToAscii(): String {
             val width = this.width
@@ -60,9 +62,10 @@ class AsciiArtCommand : BaseCommand() {
             return asciiArt.toString()
         }
 
+
         private fun String.saveAsciiArtToImage(width: Int, height: Int): String {
-        val imgWidth = width * fontSize / 2
-        val imgHeight = height * fontSize / 2
+            val imgWidth = width * FONT_SIZE / 2
+            val imgHeight = height * FONT_SIZE / 2
             val img = BufferedImage(imgWidth, imgHeight, BufferedImage.TYPE_INT_RGB)
             val g2d = img.createGraphics()
             g2d.color = Color.BLACK
@@ -71,30 +74,40 @@ class AsciiArtCommand : BaseCommand() {
             g2d.font = font
             val lines = this.split("\n")
             for ((index, line) in lines.withIndex()) {
-            g2d.drawString(line, 0, (index + 1) * fontSize)
+                g2d.drawString(line, 0, (index + 1) * FONT_SIZE)
             }
             g2d.dispose()
             return img.toByteArray().encodeToBase64()
         }
 
-    override suspend fun executeGroup(listener: OneBotListener, message: GroupMessage, args: List<String>) {
-        if (args.isEmpty()) {
-            val msg = MessageChain.Builder().addText("发送`/ascii <图片>`可以将图片转成ascii字符").build()
+        suspend fun callback(message: GroupMessage) {
+            if (message.sender.userId in waitingList) {
+                if (message.message.any { it.type == ArrayMessageType.image }) {
+                    val url = message.message.find { it.type == ArrayMessageType.image }!!.data.file!!
+                    val bufferedImage = ImageIO.read(URI(url).toURL())
+                    val imageBase64 =
+                        bufferedImage.convertToAscii().saveAsciiArtToImage(bufferedImage.width, bufferedImage.height)
+                    val msg = MessageChain.Builder().addImage(imageBase64, true).build()
                     message.reply(msg)
-            return
+                } else {
+                    message.reply("回复错误已取消本次操作")
                 }
-        val image = message.message.find { it.type == ArrayMessageType.image }
-        if (image == null) {
-            val msg = MessageChain.Builder().addText("输入一个图片来继续操作").build()
+                waitingList.removeIf { it == message.sender.userId }
+            }
+        }
+    }
+
+    override suspend fun executeGroup(listener: OneBotListener, message: GroupMessage, args: List<String>) {
+        if (message.sender.userId !in waitingList) {
+            val msg = MessageChain.Builder()
+                .addText("请继续发送一张图片，如果输入错误则取消本次操作")
+                .build()
             message.reply(msg)
+            waitingList.add(message.sender.userId)
             return
         } else {
-            val url = image.data.file!!
-            val bufferedImage = ImageIO.read(URI(url).toURL())
-            val ascii = bufferedImage.convertToAscii()
-            val image = ascii.saveAsciiArtToImage(bufferedImage.width, bufferedImage.height)
-            val msg = MessageChain.Builder().addImage(image, true).build()
-            message.reply(msg)
+            message.reply("先发送`/ascii`再继续操作吧~")
+            return
         }
     }
 }