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

@@ -22,79 +22,92 @@ 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
-        val height = this.height
-        val asciiArt = StringBuilder()
-        for (y in 0 until height step 2) {
-            for (x in 0 until width) {
-                val pixel = Color(this.getRGB(x, y))
-                val luminance = (0.2126 * pixel.red + 0.7152 * pixel.green + 0.0722 * pixel.blue).roundToInt()
-                val asciiChar = when (luminance) {
-                    in 0..15 -> ' '
-                    in 16..31 -> '.'
-                    in 32..47 -> ':'
-                    in 48..63 -> '-'
-                    in 64..79 -> '='
-                    in 80..95 -> '+'
-                    in 96..111 -> '*'
-                    in 112..127 -> '#'
-                    in 128..143 -> '%'
-                    in 144..159 -> '@'
-                    in 160..175 -> 'a'
-                    in 176..191 -> 'o'
-                    in 192..207 -> 'e'
-                    in 208..223 -> 'h'
-                    in 224..239 -> 'u'
-                    else -> '$'
+        private fun BufferedImage.convertToAscii(): String {
+            val width = this.width
+            val height = this.height
+            val asciiArt = StringBuilder()
+            for (y in 0 until height step 2) {
+                for (x in 0 until width) {
+                    val pixel = Color(this.getRGB(x, y))
+                    val luminance = (0.2126 * pixel.red + 0.7152 * pixel.green + 0.0722 * pixel.blue).roundToInt()
+                    val asciiChar = when (luminance) {
+                        in 0..15 -> ' '
+                        in 16..31 -> '.'
+                        in 32..47 -> ':'
+                        in 48..63 -> '-'
+                        in 64..79 -> '='
+                        in 80..95 -> '+'
+                        in 96..111 -> '*'
+                        in 112..127 -> '#'
+                        in 128..143 -> '%'
+                        in 144..159 -> '@'
+                        in 160..175 -> 'a'
+                        in 176..191 -> 'o'
+                        in 192..207 -> 'e'
+                        in 208..223 -> 'h'
+                        in 224..239 -> 'u'
+                        else -> '$'
+                    }
+                    asciiArt.append(asciiChar)
                 }
-                asciiArt.append(asciiChar)
+                asciiArt.append("\n")
             }
-            asciiArt.append("\n")
+            return asciiArt.toString()
         }
-        return asciiArt.toString()
-    }
 
-    private fun String.saveAsciiArtToImage(width: Int, height: Int): String {
-        val imgWidth = width * fontSize / 2
-        val imgHeight = height * fontSize / 2
-        val img = BufferedImage(imgWidth, imgHeight, BufferedImage.TYPE_INT_RGB)
-        val g2d = img.createGraphics()
-        g2d.color = Color.BLACK
-        g2d.fillRect(0, 0, imgWidth, imgHeight)
-        g2d.color = Color.WHITE
-        g2d.font = font
-        val lines = this.split("\n")
-        for ((index, line) in lines.withIndex()) {
-            g2d.drawString(line, 0, (index + 1) * fontSize)
+
+        private fun String.saveAsciiArtToImage(width: Int, height: Int): String {
+            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
+            g2d.fillRect(0, 0, imgWidth, imgHeight)
+            g2d.color = Color.WHITE
+            g2d.font = font
+            val lines = this.split("\n")
+            for ((index, line) in lines.withIndex()) {
+                g2d.drawString(line, 0, (index + 1) * FONT_SIZE)
+            }
+            g2d.dispose()
+            return img.toByteArray().encodeToBase64()
+        }
+
+        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)
+                } else {
+                    message.reply("回复错误已取消本次操作")
+                }
+                waitingList.removeIf { it == message.sender.userId }
+            }
         }
-        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()
-            message.reply(msg)
-            return
-        }
-        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()
+        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
         }
     }
 }