Extract default wallpapers

main.rs

// First you should prepare all themes with default wallpapers using
// tdesktop. Go to Settings -> Chat Settings -> Choose from gallery,
// choose a wallpaper, go back -> Launch theme editor -> ... -> Export
// theme -> Export, and name it `n.tdesktop-theme` where n is an
// inremeneted counter. Repeat for all wallpapers.

// Specify the last value of `n` here
const N: u8 = 1;
// Specify the channel where the wallpapers will be sent
const CHANNEL: &str = "@defaultwallpapers";

use tbot::{
    prelude::*,
    types::{Document, Photo},
    Bot,
};
use tdesktop_theme::TdesktopTheme;

fn main() {
    let bot = &Bot::from_env("BOT_TOKEN");

    for nth in 1..=N {
        let picture = TdesktopTheme::from_bytes(
            &std::fs::read(format!("./{}.tdesktop-theme", nth))
                .unwrap_or_else(|_| {
                    panic!("theme {} does not exist", nth);
                }),
        )
        .unwrap_or_else(|_| {
            panic!("theme {} is invalid valid", nth);
        })
        .wallpaper
        .unwrap_or_else(|| {
            panic!("theme {} has no wallpaper", nth);
        })
        .bytes;

        let mock = bot.mock();
        let preview = bot
            .send_photo(CHANNEL, Photo::bytes(&picture))
            .into_future()
            .map_err(|error| {
                dbg!(error);
            })
            // Parsing of the response fails atm, so an error is
            // returned though everything is actually okay. Once this
            // is fixed, change it to `and_then`
            .or_else(move |_| {
                mock.send_document(
                    CHANNEL,
                    Document::bytes("wallpaper.jpg", &picture),
                )
                .into_future()
            })
            .map_err(|error| {
                dbg!(error);
            });

        tbot::run(preview);
    }
}