#[crate_id(name="printenv", vers="1.0.0", author="Seldaek")]; /* * This file is part of the uutils coreutils package. * * (c) Jordi Boggiano * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ /* last synced with: printenv (GNU coreutils) 8.13 */ extern mod extra; use std::os; use std::io::stderr; use extra::getopts::groups; fn main() { let args = os::args(); let program = args[0].clone(); let opts = ~[ groups::optflag("0", "null", "end each output line with 0 byte rather than newline"), groups::optflag("h", "help", "display this help and exit"), groups::optflag("V", "version", "output version information and exit"), ]; let matches = match groups::getopts(args.tail(), opts) { Ok(m) => m, Err(f) => { writeln!(&mut stderr() as &mut Writer, "Invalid options\n{}", f.to_err_msg()); os::set_exit_status(1); return } }; if matches.opt_present("help") { println("printenv 1.0.0"); println(""); println("Usage:"); println!(" {0:s} [VARIABLE]... [OPTION]...", program); println(""); print(groups::usage("Prints the given environment VARIABLE(s), otherwise prints them all.", opts)); return; } if matches.opt_present("version") { println("printenv 1.0.0"); return; } let mut separator = "\n"; if matches.opt_present("null") { separator = "\x00"; }; exec(matches.free, separator); } pub fn exec(args: ~[~str], separator: &str) { if args.is_empty() { let vars = os::env(); for (env_var, value) in vars.move_iter() { print!("{0:s}={1:s}", env_var, value); print(separator); } return; } for env_var in args.iter() { match os::getenv(*env_var) { Some(var) => { print(var); print(separator); } _ => () } } }