coreutils/cat/cat.rs
2014-05-28 08:33:39 +02:00

188 lines
6.9 KiB
Rust

#![crate_id(name="cat", vers="1.0.0", author="Seldaek")]
#![feature(managed_boxes)]
/*
* This file is part of the uutils coreutils package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/* last synced with: cat (GNU coreutils) 8.13 */
extern crate getopts;
use std::os;
use std::io::{print, File};
use std::io::stdio::{stdout_raw, stdin_raw};
use std::io::{BufferedWriter};
fn main() {
let args = os::args();
let program = args.get(0).as_slice();
let opts = ~[
getopts::optflag("A", "show-all", "equivalent to -vET"),
getopts::optflag("b", "number-nonblank", "number nonempty output lines, overrides -n"),
getopts::optflag("e", "", "equivalent to -vE"),
getopts::optflag("E", "show-ends", "display $ at end of each line"),
getopts::optflag("n", "number", "number all output lines"),
getopts::optflag("s", "squeeze-blank", "suppress repeated empty output lines"),
getopts::optflag("t", "", "equivalent to -vT"),
getopts::optflag("T", "show-tabs", "display TAB characters as ^I"),
getopts::optflag("v", "show-nonprinting", "use ^ and M- notation, except for LF (\\n) and TAB (\\t)"),
getopts::optflag("h", "help", "display this help and exit"),
getopts::optflag("V", "version", "output version information and exit"),
];
let matches = match getopts::getopts(args.tail(), opts) {
Ok(m) => m,
Err(f) => fail!("Invalid options\n{}", f.to_err_msg())
};
if matches.opt_present("help") {
println!("cat 1.0.0");
println!("");
println!("Usage:");
println!(" {0:s} [OPTION]... [FILE]...", program);
println!("");
print(getopts::usage("Concatenate FILE(s), or standard input, to standard output.", opts).as_slice());
println!("");
println!("With no FILE, or when FILE is -, read standard input.");
return;
}
if matches.opt_present("version") {
println!("cat 1.0.0");
return;
}
let mut number_mode = NumberNone;
if matches.opt_present("number") {
number_mode = NumberAll;
}
if matches.opt_present("number-nonblank") {
number_mode = NumberNonEmpty;
}
let show_nonprint = matches.opts_present(["show-nonprinting".to_string(), "show-all".to_string(), "t".to_string(), "e".to_string()]);
let show_ends = matches.opts_present(["show-ends".to_string(), "show-all".to_string(), "e".to_string()]);
let show_tabs = matches.opts_present(["show-tabs".to_string(), "show-all".to_string(), "t".to_string()]);
let squeeze_blank = matches.opt_present("squeeze-blank");
let mut files = matches.free;
if files.is_empty() {
files = vec!("-".to_string());
}
exec(files, number_mode, show_nonprint, show_ends, show_tabs, squeeze_blank);
}
#[deriving(Eq)]
pub enum NumberingMode {
NumberNone,
NumberNonEmpty,
NumberAll,
}
static TAB: u8 = '\t' as u8;
#[allow(dead_code)]
static CR: u8 = '\r' as u8;
static LF: u8 = '\n' as u8;
#[cfg(windows)]
fn is_newline_char(byte: u8) -> bool {
byte == LF || byte == CR
}
#[cfg(unix)]
fn is_newline_char(byte: u8) -> bool {
byte == LF
}
pub fn exec(files: Vec<String>, number: NumberingMode, show_nonprint: bool, show_ends: bool, show_tabs: bool, squeeze_blank: bool) {
if NumberNone != number || show_nonprint || show_ends || show_tabs || squeeze_blank {
let mut counter: uint = 1;
let is_numbering = number == NumberAll || number == NumberNonEmpty;
for path in files.iter() {
let mut reader = match open(path.as_slice()) {
Some(f) => f,
None => { continue }
};
let mut writer = BufferedWriter::with_capacity(1024 * 8, stdout_raw());
let mut at_line_start = true;
let mut buf = ~[0, .. 1024 * 4];
loop {
// reading from a TTY seems to raise a condition on
// EOF, rather than return Some(0) like a file.
match reader.read(buf) {
Ok(n) if n != 0 => {
for &byte in buf.slice_to(n).iter() {
if at_line_start && (number == NumberAll || (number == NumberNonEmpty && !is_newline_char(byte))) {
(write!(&mut writer as &mut Writer, "{0:6u}\t", counter)).unwrap();
counter += 1;
at_line_start = false;
}
if is_numbering && byte == LF {
at_line_start = true;
}
if show_tabs && byte == TAB {
writer.write(bytes!("^I")).unwrap();
} else if show_ends && byte == LF {
writer.write(bytes!("$\n")).unwrap();
} else if show_nonprint && (byte < 32 || byte >= 127) && !is_newline_char(byte) {
let mut byte = byte;
if byte >= 128 {
writer.write(bytes!("M-")).unwrap();
byte = byte - 128;
}
if byte < 32 {
writer.write(['^' as u8, byte + 64]).unwrap();
} else if byte == 127 {
writer.write(['^' as u8, byte - 64]).unwrap();
} else {
writer.write_u8(byte).unwrap();
}
} else {
writer.write_u8(byte).unwrap();
}
}
},
_ => break
}
}
}
return;
}
let mut writer = stdout_raw();
let mut buf = ~[0, .. 1024 * 64];
// passthru mode
for path in files.iter() {
let mut reader = match open(path.as_slice()) {
Some(f) => f,
None => { continue }
};
loop {
// reading from a TTY seems to raise a condition on EOF,
// rather than return Some(0) like a file.
match reader.read(buf) {
Ok(n) if n != 0 => {
writer.write(buf.slice_to(n)).unwrap();
}, _ => break
}
}
}
}
fn open(path: &str) -> Option<Box<Reader>> {
if "-" == path {
return Some(box stdin_raw() as Box<Reader>);
}
match File::open(&std::path::Path::new(path.as_slice())) {
Ok(fd) => return Some(box fd as Box<Reader>),
Err(e) => fail!("cat: {0:s}: {1:s}", path, e.to_str())
}
}
/* vim: set ai ts=4 sw=4 sts=4 et : */