gol 0.1.9

Conway's game of life in OpenGL.
Documentation 
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extern crate gol;
extern crate clap;

use gol::rendering;
use gol::data::Grid;
use clap::{Arg, App, ArgMatches};
use std::str::FromStr;
use std::fmt::Display;

fn main() {

    let matches = App::new("Game of Life")
        .version(version().as_ref())
        .about("Conway's Game of Life in OpenGL!")
        .arg(Arg::with_name("grid-width")
                 .short("w")
                 .long("grid-width")
                 .default_value("100")
                 .help("Width of the grid"))
        .arg(Arg::with_name("grid-height")
                 .short("h")
                 .long("grid-height")
                 .default_value("80")
                 .help("Height of the grid"))
        .arg(Arg::with_name("window-width")
                 .long("window-width")
                 .default_value("1024")
                 .help("Width of the window"))
        .arg(Arg::with_name("window-height")
                 .long("window-height")
                 .default_value("768")
                 .help("Height of the window"))
        .arg(Arg::with_name("update-rate")
                 .short("u")
                 .long("update-rate")
                 .default_value("30")
                 .help("Number of updates to the game board per second"))
        .get_matches();

    let grid_width = get_number("grid-width", Some(0), &matches);
    let grid_height = get_number("grid-height", Some(0), &matches);
    let window_width = get_number("window-width", Some(0), &matches);
    let window_height = get_number("window-height", Some(0), &matches);
    let updates_per_second = get_number("update-rate", None, &matches);

    let grid = Grid::new(grid_width, grid_height);
    let mut app = rendering::App::new(grid, window_width, window_height, updates_per_second);
    app.run();
}

fn version() -> String {
    let (maj, min, pat) = (option_env!("CARGO_PKG_VERSION_MAJOR"),
                           option_env!("CARGO_PKG_VERSION_MINOR"),
                           option_env!("CARGO_PKG_VERSION_PATCH"));
    match (maj, min, pat) {
        (Some(maj), Some(min), Some(pat)) => format!("{}.{}.{}", maj, min, pat),
        _ => "".to_owned(),
    }
}

fn get_number<'a, A>(name: &str, maybe_min: Option<A>, matches: &ArgMatches<'a>) -> A
    where A: FromStr + PartialOrd + Display + Copy,
          <A as FromStr>::Err: std::fmt::Debug
{
    matches
        .value_of(name)
        .and_then(|s| s.parse::<A>().ok())
        .and_then(|u| match maybe_min {
                      Some(min) => if u > min { Some(u) } else { None },
                      _ => Some(u),
                  })
        .expect(&{
                     if let Some(min) = maybe_min {
                         format!("{} should be a positive number greater than {}.", name, min)
                     } else {
                         format!("{} should be a positive number.", name)
                     }
                 }
                     [..])
}