src/main.rs


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mod protos;
use protos::protos::gtfs_realtime::FeedMessage;

use protobuf::Message;
use clap::Parser;

#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
struct Args {
   /// uri of the GTFS RT feed to fetch & display
   url: String,
   /// emit the feed as json
   #[arg(long)]
   json: bool
}


#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let args = Args::parse();
    let resp = reqwest::get(&args.url)
        .await?
        .bytes().await?;

    let proto = FeedMessage::parse_from_bytes(&resp[..])?;

    match args.json {
        true => 
            println!("{}", protobuf_json_mapping::print_to_string(&proto)?),
        false => 
            println!("{}", protobuf::text_format::print_to_string_pretty(&proto))
    }
    Ok(())
}