TelegramBotAPI-bot_template/src/main/kotlin/App.kt

import config.Config
import dev.inmo.tgbotapi.bot.ktor.telegramBot
import dev.inmo.tgbotapi.extensions.api.bot.getMe
import dev.inmo.tgbotapi.extensions.api.send.reply
import dev.inmo.tgbotapi.extensions.behaviour_builder.buildBehaviourWithLongPolling
import dev.inmo.tgbotapi.extensions.behaviour_builder.triggers_handling.onCommand
import io.ktor.client.*
import io.ktor.client.engine.okhttp.*
import java.io.File
import kotlinx.coroutines.*
import kotlinx.serialization.json.Json

/**
 * This method by default expects one argument in [args] field: telegram bot configuration
 */
suspend fun main(args: Array<String>) {
    // create json to decode config
    val json = Json { ignoreUnknownKeys = true }
    // decode config
    val config: Config = json.decodeFromString(Config.serializer(), File(args.first()).readText())
    // that is your bot
    val bot = telegramBot(config.token) {
        client = HttpClient(OkHttp) {
            config.client ?.apply {
                // setting up telegram bot client
                setupConfig()
            }
        }
    }

    // that is kotlin coroutine scope which will be used in requests and parallel works under the hood
    val scope = CoroutineScope(Dispatchers.Default)

    // here should be main logic of your bot
    bot.buildBehaviourWithLongPolling(scope) {
        // in this lambda you will be able to call methods without "bot." prefix
        val me = getMe()

        // this method will create point to react on each /start command
        onCommand("start", requireOnlyCommandInMessage = true) {
            // simply reply :)
            reply(it, "Hello, I am ${me.firstName}")
        }

        // That will be called on the end of bot initiation. After that println will be started long polling and bot will
        // react on your commands
        println(me)
    }.join()
}