//! Handles arg parsing
use super::*;
use std::fmt;

mod usage;
mod data;

/// The name of the process that was invoked
#[inline] pub fn prog_name() -> &'static str
{
    lazy_static! {
	static ref NAME: String = std::env::args().next().unwrap();
    }
    &NAME[..]
}

/// Print usage
pub fn print_usage()
{    
    println!(r#"batchtask v{version} - advanced process batching
 by {author} with <3 (licensed GPL3+)"#,
	     version = env!("CARGO_PKG_VERSION"),
	     author = env!("CARGO_PKG_AUTHORS"));
    println!(r#"
Usage: {prog} [OPTIONS] [TASKS]...
Usage: {prog} --help

{opts}

Compiled with:
{features}
"#,
	     prog = prog_name(),
	     opts = usage::sections().join("\n").trim(),
	     features = usage::features().join("\n"));
}

/// Print usage then exit with code 0
#[inline(always)] pub fn usage() -> !
{
    print_usage();
    std::process::exit(0)
}