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https://github.com/uutils/coreutils
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Implement tee
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commit
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@ -121,7 +121,6 @@ To do
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- tac-pipe
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- tac
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- tail
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- tee
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- test
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- timeout
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- touch
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108
tee/tee.rs
Normal file
108
tee/tee.rs
Normal file
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@ -0,0 +1,108 @@
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#[link(name="tee", vers="1.0.0", author="Aleksander Bielawski")];
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/*
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* This file is part of the uutils coreutils package.
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*
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* (c) Aleksander Bielawski <pabzdzdzwiagief@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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extern mod extra;
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use std::io::{stdin, stdout, Append, File, Truncate, Write};
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use std::io::{io_error, result, EndOfFile};
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use std::io::signal::{Interrupt, Listener};
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use std::io::util::{copy, MultiWriter};
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use std::os::{args, set_exit_status};
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use extra::getopts::groups::{getopts, optflag, usage};
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static NAME: &'static str = "tee";
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static VERSION: &'static str = "1.0.0";
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fn main() {
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match options(args()).and_then(exec) {
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Err(message) => {
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error!("{}: {}", args()[0], message);
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set_exit_status(1)
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},
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Ok(status) => set_exit_status(status)
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}
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}
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struct Options {
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program: ~str,
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append: bool,
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ignore_interrupts: bool,
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print_and_exit: Option<~str>,
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files: ~[Path]
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}
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fn options(args: &[~str]) -> Result<Options, ~str> {
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let opts = ~[
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optflag("a", "append", "append to the given FILEs, do not overwrite"),
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optflag("i", "ignore-interrupts", "ignore interrupt signals"),
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optflag("", "help", "display this help and exit"),
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optflag("", "version", "output version information and exit")];
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getopts(args.tail(), opts).map_err(|e| e.to_err_msg()).and_then(|m| {
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let version = format!("{} {}", NAME, VERSION);
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let program = args[0].clone();
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let arguments = "[OPTION]... [FILE]...";
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let brief = "Copy standard input to each FILE, and also to standard " +
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"output.";
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let comment = "If a FILE is -, copy again to standard output.";
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let help = format!("{}\n\nUsage:\n {} {}\n\n{}\n{}",
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version, program, arguments, usage(brief, opts),
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comment);
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let names = m.free + ~[~"-"];
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let to_print = if m.opt_present("help") { Some(help) }
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else if m.opt_present("version") { Some(version) }
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else { None };
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Ok(Options {
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program: program,
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append: m.opt_present("append"),
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ignore_interrupts: m.opt_present("ignore-interrupts"),
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print_and_exit: to_print,
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files: names.map(|name| Path::new(name.clone()))
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})
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})
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}
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fn open(path: &Path, append: bool) -> ~Writer {
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if *path == Path::new("-") {
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~stdout() as ~Writer
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} else {
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let mode = if append { Append } else { Truncate };
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~File::open_mode(path, mode, Write) as ~Writer
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}
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}
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fn exec(options: Options) -> Result<int, ~str> {
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match options.print_and_exit {
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Some(text) => {
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println(text);
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Ok(0)
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},
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None => tee(options)
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}
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}
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fn tee(options: Options) -> Result<int, ~str> {
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let mut handler = Listener::new();
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if options.ignore_interrupts {
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handler.register(Interrupt);
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}
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result(|| io_error::cond.trap(|e| {
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if e.kind != EndOfFile {
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io_error::cond.raise(e);
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}
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}).inside(|| {
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let writers = options.files.map(|path| open(path, options.append));
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let output = &mut MultiWriter::new(writers);
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let input = &mut stdin();
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copy(input, output);
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output.flush();
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0
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})).map_err(|err| err.desc.to_owned())
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}
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