add partially working native sample

NativeRandomFileSenderBot/README.md

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+# RandomFileSenderBot
+
+This bot will send random file from input folder OR from bot working folder
+
+## Launch
+
+```bash
+../gradlew run --args="BOT_TOKEN[ optional/folder/path]"
+```

NativeRandomFileSenderBot/build.gradle

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+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+plugins {
+    id "org.jetbrains.kotlin.multiplatform"
+}
+
+
+kotlin {
+    def hostOs = System.getProperty("os.name")
+    def isMingwX64 = hostOs.startsWith("Windows")
+    def nativeTarget
+    if (hostOs == "Linux") nativeTarget = linuxX64("native") { binaries { executable() } }
+    else if (isMingwX64) nativeTarget = mingwX64("native") { binaries { executable() } }
+    else throw new GradleException("Host OS is not supported in Kotlin/Native.")
+
+    sourceSets {
+        commonMain {
+            dependencies {
+                implementation kotlin('stdlib')
+
+                api "dev.inmo:tgbotapi:$telegram_bot_api_version"
+            }
+        }
+
+        nativeMain {
+            dependencies {
+                def engine
+
+                if (hostOs == "Linux") engine = "curl"
+                else if (isMingwX64) engine = "winhttp"
+                else throw new GradleException("Host OS is not supported in Kotlin/Native.")
+
+                api "io.ktor:ktor-client-$engine:$ktor_version"
+            }
+        }
+    }
+}

NativeRandomFileSenderBot/src/nativeMain/kotlin/RandomFileSenderBot.kt

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+import dev.inmo.micro_utils.common.MPPFile
+import dev.inmo.micro_utils.common.filesize
+import dev.inmo.micro_utils.coroutines.runCatchingSafely
+import dev.inmo.micro_utils.coroutines.subscribeSafelyWithoutExceptions
+import dev.inmo.tgbotapi.bot.ktor.telegramBot
+import dev.inmo.tgbotapi.bot.TelegramBot
+import dev.inmo.tgbotapi.extensions.api.bot.getMe
+import dev.inmo.tgbotapi.extensions.api.bot.setMyCommands
+import dev.inmo.tgbotapi.extensions.api.send.*
+import dev.inmo.tgbotapi.extensions.api.send.media.sendDocument
+import dev.inmo.tgbotapi.extensions.api.send.media.sendDocumentsGroup
+import dev.inmo.tgbotapi.extensions.behaviour_builder.buildBehaviourWithLongPolling
+import dev.inmo.tgbotapi.extensions.behaviour_builder.triggers_handling.onCommandWithArgs
+import dev.inmo.tgbotapi.requests.abstracts.asMultipartFile
+import dev.inmo.tgbotapi.types.BotCommand
+import dev.inmo.tgbotapi.types.chat.Chat
+import dev.inmo.tgbotapi.types.files.DocumentFile
+import dev.inmo.tgbotapi.types.media.TelegramMediaDocument
+import dev.inmo.tgbotapi.types.mediaCountInMediaGroup
+import kotlinx.coroutines.runBlocking
+import okio.FileSystem
+import okio.Path.Companion.toPath
+
+private const val command = "send_file"
+
+/**
+ * This bot will send files inside of working directory OR from directory in the second argument.
+ * You may send /send_file command to this bot to get random file from the directory OR
+ * `/send_file $number` when you want to receive required number of files. For example,
+ * /send_file and `/send_file 1` will have the same effect - bot will send one random file.
+ * But if you will send `/send_file 5` it will choose 5 random files and send them as group
+ */
+fun main(args: Array<String>) = runBlocking {
+    val botToken = args.first()
+    val directoryOrFile = args.getOrNull(1) ?.toPath() ?: "".toPath()
+
+    fun pickFile(currentRoot: MPPFile = directoryOrFile): MPPFile? {
+        if (FileSystem.SYSTEM.exists(currentRoot) && FileSystem.SYSTEM.listOrNull(currentRoot) == null) {
+            return currentRoot
+        } else {
+            return pickFile(FileSystem.SYSTEM.list(currentRoot).takeIf { it.isNotEmpty() } ?.random() ?: return null)
+        }
+    }
+
+    suspend fun TelegramBot.sendFiles(chat: Chat, files: List<MPPFile>) {
+        when (files.size) {
+            1 -> {
+                sendDocument(
+                    chat.id,
+                    files.first().asMultipartFile(),
+                    protectContent = true
+                )
+            }
+            else -> sendDocumentsGroup(
+                chat,
+                files.map { TelegramMediaDocument(it.asMultipartFile()) },
+                protectContent = true
+            )
+        }
+    }
+
+    val bot = telegramBot(botToken)
+
+    bot.buildBehaviourWithLongPolling (defaultExceptionsHandler = { it.printStackTrace() }) {
+        onCommandWithArgs(command) { message, args ->
+            withUploadDocumentAction(message.chat) {
+                val count = args.firstOrNull() ?.toIntOrNull() ?: 1
+                var sent = false
+
+                var left = count
+                val chosen = mutableListOf<MPPFile>()
+
+                while (left > 0) {
+                    val picked = pickFile() ?.takeIf { it.filesize > 0 } ?: continue
+                    chosen.add(picked)
+                    left--
+                    if (chosen.size >= mediaCountInMediaGroup.last) {
+                        runCatchingSafely {
+                            sendFiles(message.chat, chosen)
+                        }.onFailure {
+                            it.printStackTrace()
+                        }
+                        chosen.clear()
+                        sent = true
+                    }
+                }
+
+                if (chosen.isNotEmpty()) {
+                    sendFiles(message.chat, chosen)
+                    sent = true
+                }
+
+                if (!sent) {
+                    reply(message, "Nothing selected :(")
+                }
+            }
+        }
+
+        setMyCommands(
+            BotCommand(command, "Send some random file in picker directory")
+        )
+
+        allUpdatesFlow.subscribeSafelyWithoutExceptions(this) {
+            println(it)
+        }
+
+        println(getMe())
+    }.join()
+}