Exception handling

gistfile1.cpp

extern mod std;
extern mod docopt;

use send_map::linear::LinearMap;
use io::{ReaderUtil, WriterUtil};


/// Reads whole stream and outputs it as string
fn read_whole_stream_to_str(input_stream: io::Reader) -> ~str {
    let mut buf = ~[];
    loop {
        let ch = input_stream.read_byte();
        if input_stream.eof() { break; }
        buf.push(ch as u8);
    }
    str::from_bytes(buf)
}


fn main () {

    let input_stream = io::stdin();

    // let doc: ~str = read_whole_stream_to_str(input_stream);
    let doc = ~"some fancy docstring";

    let docopt_result: Result<~LinearMap<~str, ~str>, ()> = do task::try {
	let options = docopt::docopt(copy doc);
	move options
    };

    match docopt_result {
	Ok(options) => io::println(
            fmt!("%?", options)),
	Err(options) => io::println(fmt!("%?", options.to_str()))

    }

/**
* I get this:
*
~{ k0: 4644902254958875435, k1: 16078254338373962874, resize_at: 24, size: 1, buckets: 
~[ None, Some({ hash: 7004769276290571297, key: ~"some fancy string", value: ~"some fancy string" }), 
None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, 
None, None, None, None, None, None, None, None, None, None, None, None, None, None ] }
*/
}