mirror of
https://github.com/uutils/coreutils
synced 2024-12-15 15:52:42 +00:00
157 lines
4.7 KiB
Rust
157 lines
4.7 KiB
Rust
#[crate_id(name="tee", vers="1.0.0", author="Aleksander Bielawski")];
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#[license="MIT"];
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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, EndOfFile};
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use std::io::signal::{Interrupt, Listener};
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use std::io::util::{copy, NullWriter, 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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Ok(_) => set_exit_status(0),
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Err(_) => set_exit_status(1)
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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, ()> {
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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("h", "help", "display this help and exit"),
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optflag("V", "version", "output version information and exit"),
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];
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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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}).map_err(|message| warn(message))
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}
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fn exec(options: Options) -> Result<(), ()> {
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match options.print_and_exit {
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Some(text) => Ok(println(text)),
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None => tee(options)
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}
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}
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fn tee(options: Options) -> Result<(), ()> {
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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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let mut ok = true;
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io_error::cond.trap(|_| ok = false).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 NamedReader { inner: ~stdin() as ~Reader };
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copy(input, output);
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output.flush();
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});
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if ok { Ok(()) } else { Err(()) }
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}
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fn open(path: &Path, append: bool) -> ~Writer {
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let inner = with_path(path, || 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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match File::open_mode(path, mode, Write) {
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Some(file) => ~file as ~Writer,
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None => ~NullWriter as ~Writer
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}
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});
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~NamedWriter { inner: inner, path: ~path.clone() } as ~Writer
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}
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struct NamedWriter {
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priv inner: ~Writer,
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priv path: ~Path
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}
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impl Writer for NamedWriter {
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fn write(&mut self, buf: &[u8]) {
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with_path(self.path, || io_error::cond.trap(|e| {
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self.inner = ~NullWriter as ~Writer;
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io_error::cond.raise(e);
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}).inside(|| self.inner.write(buf)))
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}
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fn flush(&mut self) {
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with_path(self.path, || io_error::cond.trap(|e| {
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self.inner = ~NullWriter as ~Writer;
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io_error::cond.raise(e);
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}).inside(|| self.inner.flush()))
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}
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}
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struct NamedReader {
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priv inner: ~Reader
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}
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impl Reader for NamedReader {
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fn read(&mut self, buf: &mut [u8]) -> Option<uint> {
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with_path(&Path::new("stdin"), || 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(|| self.inner.read(buf)))
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}
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fn eof(&mut self) -> bool {
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self.inner.eof()
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}
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}
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fn with_path<T>(path: &Path, cb: || -> T) -> T {
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io_error::cond.trap(|e| {
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warn(format!("{}: {}", path.display(), e.desc));
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io_error::cond.raise(e);
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}).inside(cb)
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}
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fn warn(message: &str) {
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error!("{}: {}", args()[0], message);
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}
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