wowcpe 0.2.2

Command-line tool for the classical radio station WCPE
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// Copyright 2017 Mitchell Kember. Subject to the MIT License.

use {
    chrono::{DateTime, Local, Timelike},
    clap::{App, Arg},
    std::path::PathBuf,
    wowcpe::{Request, Response},
};

fn main() {
    let matches = App::new("WOWCPE")
        .version("0.2.2")
        .about("Show what is playing on WCPE - theclassicalstation.org")
        .arg(
            Arg::with_name("time")
                .short("t")
                .long("time")
                .value_name("HH:MM")
                .takes_value(true)
                .help("Look up a specific time today"),
        )
        .arg(
            Arg::with_name("no_cache")
                .short("n")
                .long("--no-cache")
                .takes_value(false)
                .help("Disable caching"),
        )
        .get_matches();

    let time = if let Some(arg) = matches.value_of("time") {
        parse_time(arg).unwrap_or_else(|| invalid_arg(arg))
    } else {
        current_time()
    };

    let request = &Request { time };
    let cache = cache_file_path();
    let result = match (cache, matches.is_present("no_cache")) {
        (Some(path), false) => wowcpe::lookup_cached(request, &path),
        _ => wowcpe::lookup(request),
    };
    match result {
        Ok(response) => print_response(&response),
        Err(err) => fail(&err.to_string()),
    }
}

fn cache_file_path() -> Option<PathBuf> {
    xdg::BaseDirectories::with_prefix("wowcpe")
        .ok()?
        .place_cache_file("playlist.html")
        .ok()
}

fn current_time() -> DateTime<Local> {
    Local::now().with_nanosecond(0).unwrap()
}

fn parse_time(input: &str) -> Option<DateTime<Local>> {
    let input: &str = &input.trim().to_lowercase();
    let (input, hour_offset) = if input.len() >= 2 {
        match input.split_at(input.len() - 2) {
            (x, "am") => (x, 0),
            (x, "pm") => (x, 12),
            _ => (input, 0),
        }
    } else {
        (input, 0)
    };
    let (hour, minute): (u32, u32) = if let Some(index) = input.find(':') {
        let (hh, colon_mm) = input.split_at(index);
        let mm = &colon_mm[1..];
        if let (Ok(hour), Ok(minute)) = (hh.parse(), mm.parse()) {
            (hour, minute)
        } else {
            return None;
        }
    } else if let Ok(hour) = input.parse() {
        (hour, 0)
    } else {
        return None;
    };

    Local::now()
        .with_hour(hour + hour_offset)
        .and_then(|t| t.with_minute(minute))
        .and_then(|t| t.with_nanosecond(0))
}

fn print_response(r: &Response) {
    let fmt = "%l:%M %p";
    let start = r.start_time.time().format(fmt).to_string();
    let end = r.end_time.time().format(fmt).to_string();

    println!("Program       {}", r.program);
    println!("Time          {} - {}", start.trim(), end.trim());
    println!("Composer      {}", r.composer);
    println!("Title         {}", r.title);
    println!("Performers    {}", r.performers);
    println!("Record Label  {}", r.record_label);
}

fn fail(message: &str) -> ! {
    eprintln!("{}", message);
    std::process::exit(1);
}

fn invalid_arg(arg: &str) -> ! {
    eprintln!("{}: Invalid argument", arg);
    eprintln!("For more information try --help");
    std::process::exit(1)
}