osmgraphing 0.4.0

Playing around with graphs created via parsing OpenStreetMap data
Documentation 
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use clap;

//------------------------------------------------------------------------------------------------//

fn parse_cmdline<'a>() -> clap::ArgMatches<'a> {
    clap::App::new(env!("CARGO_PKG_NAME"))
        .version(env!("CARGO_PKG_VERSION"))
        .author(env!("CARGO_PKG_AUTHORS"))
        .about(env!("CARGO_PKG_DESCRIPTION"))
        .long_about(
            (&[
                "",
                "For all supported example files, please use",
                "    `cargo run --example`",
                "",
                "You can set up the logger by setting RUST_LOG, e.g. to",
                "    export RUST_LOG='warn,osmgraphing=info,parser=info,dijkstra=info'",
                "",
                "for getting `warn`s per default, but `info` about the others (e.g. `parser`).",
            ]
            .join("\n"))
                .as_ref(),
        )
        .arg(
            clap::Arg::with_name("verbose")
                .short("v")
                .long("verbose")
                .help(
                    &[
                        "Logs `info` in addition to `warn` and `error`.",
                        "Env-variable `RUST_LOG` is set, this flag is ignored.",
                    ]
                    .join("\n"),
                ),
        )
        .get_matches()
}

fn setup_logging(verbosely: bool) {
    let mut builder = env_logger::Builder::new();
    // minimum filter-level: `warn`
    builder.filter(None, log::LevelFilter::Warn);
    // if verbose logging: log `info` for the server and this repo
    if verbosely {
        builder.filter(Some("actix"), log::LevelFilter::Info);
        builder.filter(Some("osmgraphing"), log::LevelFilter::Info);
    }
    // overwrite default with environment-variables
    if let Ok(filters) = std::env::var("RUST_LOG") {
        builder.parse_filters(&filters);
    }
    if let Ok(write_style) = std::env::var("RUST_LOG_STYLE") {
        builder.parse_write_style(&write_style);
    }
    // init
    builder.init();
}

fn main() {
    let matches = parse_cmdline();
    setup_logging(matches.is_present("verbose"));

    if matches.args.len() == 0 {
        println!("Execute `cargo run -- -h` (or `.../osmgraphing -h`) for more info.");
    }
}