JDice/src/main/kotlin/JDice.kt

package top.jie65535

import net.mamoe.mirai.console.plugin.jvm.JvmPluginDescription
import net.mamoe.mirai.console.plugin.jvm.KotlinPlugin
import net.mamoe.mirai.event.globalEventChannel
import net.mamoe.mirai.event.subscribeMessages
import net.mamoe.mirai.message.data.MessageSource.Key.quote
import net.mamoe.mirai.message.data.PlainText
import net.mamoe.mirai.utils.info
import kotlin.random.Random

object JDice : KotlinPlugin(
    JvmPluginDescription(
        id = "top.jie65535.dice",
        name = "J Dice",
        version = "0.1.2",
    ) {
        author("jie65535")
    }
) {
    private val regex = Regex("""\b(\d{0,3})[dD](\d{1,3})\b""")
    private val random = Random(System.currentTimeMillis())

    override fun onEnable() {
        globalEventChannel().subscribeMessages {
            has<PlainText> { plainText ->
                regex.findAll(plainText.content).map {
                    val (c, d) = it.destructured
                    val count = if (c.isEmpty()) 1 else c.toInt()
                    val top = d.toInt()
                    if (count in 1..100 && top in 2..100) {
                        var value = 0
                        for (i in 1..count) {
                            value += random.nextInt(1, top + 1)
                        }
                        value.toString()
                    } else {
                        null
                    }
                }.joinToString().let {
                    if (it.isNotEmpty())
                        subject.sendMessage(message.quote() + it)
                }
            }
        }

        logger.info { "Plugin loaded. https://github.com/jie65535/JDice" }
    }
}