Telega

Telegram bot API implementation.

Run examples

To run examples from examples/ dir you need to create a bot and put it as BOT_TOKEN variable in .env file at the root of this repository.

$ cat .env
BOT_TOKEN=123456789:BotTokenHere

Now you can run examples using make command

$ make run-example-echobot
$ make run-example-keyboard
$ make run-example-pollbot

Quickstart

Simple echo bot example

import vibe.core.core : runApplication, runTask;
import vibe.core.log : setLogLevel, logInfo, LogLevel;
import std.process : environment;
import std.exception : enforce;

int main(string[] args)
{
    string botToken = environment.get("BOT_TOKEN");

    if (args.length > 1 && args[1] != null) {
        logInfo("Setting token from first argument");
        botToken = args[1];
    }

    enforce(botToken !is null, "Please provide bot token as a first argument or set BOT_TOKEN env variable");

    setLogLevel(LogLevel.diagnostic);
    runTask(&listenUpdates, botToken);

    return runApplication();
}

void listenUpdates(string token)
{
    import telega.botapi : BotApi;
    import telega.telegram.basic : Update, getUpdates, sendMessage;
    import std.algorithm.iteration : filter, each;
    import std.algorithm.comparison : max;

    int offset;
    auto api = new BotApi(token);

    while (true)
    {
        api.getUpdates(offset)
            .filter!(u => !u.message.text.isNull) // we need all updates with text message
            .each!((Update u) {
                logInfo("Text from %s: %s", u.message.chat.id, u.message.text);
                api.sendMessage(u.message.chat.id, u.message.text);
                offset = max(offset, u.id)+1;
            });
    }
}

Installation

You can add package to your project using dub:

dub add telega

Todo

• Sending files
• Inline mode
• Bot API 4.3 and newer

Help

You can find some examples in the examples dir

API types and methods can be found in telega.telegram.* modules.

Each method is typically implemented using 3 constructs:

• structure for the method fully describing its signature;
• a function that accepts a few arguments representing required method arguments
• a function that accepts a reference to a method struct for calling method with required and optional arguments

For example:

// full method structure
struct SendMessageMethod
{
    mixin TelegramMethod!"/sendMessage";

    ChatId    chat_id;
    string    text;
    Nullable!ParseMode parse_mode;
    Nullable!bool      disable_web_page_preview;
    Nullable!bool      disable_notification;
    Nullable!uint      reply_to_message_id;

    ReplyMarkup reply_markup;
}

// short form - only required args
Message sendMessage(T)(BotApi api, T chatId, string text) if (isTelegramId!T)

// full form - need to build SendTelegramMethod struct first
Message sendMessage(BotApi api, ref SendMessageMethod m)

Some hints

ChatId type is actually long or string

isTelegramId!T template checks T to be some string or number

Support

Issues and PR's are welcome.