grnenv-rs 0.2.0

grnenv is a tool to switch using multiple Groonga versions.
Documentation 
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use std::fs::File;
use std::io::prelude::*;
use std::path::PathBuf;

use hyper::Client;
use hyper::error::Error as HyperError;
use hyper::header::{Connection, UserAgent};

pub fn file_download<'a>(client: &'a Client,
                         url: &str,
                         mut base_dir: PathBuf,
                         filename: &'a str)
                         -> Result<PathBuf, HyperError> {

    let mut res = client.get(url)
        .header(Connection::close())
        .header(UserAgent(format!("grnenv-rs {}", crate_version!())))
        .send()?;
    println!("{:?}", res);
    let mut body = vec![];
    res.read_to_end(&mut body)?;
    base_dir.push(filename);
    let mut f = File::create(base_dir.to_str().unwrap()).expect("Could not create file.");
    println!("{:?}", f);
    f.write_all(&body)?;
    f.sync_data()?;
    Ok(base_dir)
}