mirror of
https://github.com/uutils/coreutils
synced 2024-12-18 17:14:42 +00:00
30bba07f9c
squashed: a2c6b27 - build: automatically generate main() files c942f0f - remove MULTICALL=1 build from travis cb7b35b - make: remove unnecessary shell command 69bbb31 - update README 03a3168 - all: move main() into separate file that links against util crate 8276384 - make: always build multicall binary aa4edeb - make: avoid 'rustc --crate-file-name'
102 lines
3.3 KiB
Rust
102 lines
3.3 KiB
Rust
#![crate_id(name = "tac", vers = "1.0.0", author = "Arcterus")]
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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) Arcterus <arcterus@mail.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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#![feature(macro_rules)]
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extern crate getopts;
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extern crate libc;
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use std::io;
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#[path = "../common/util.rs"]
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mod util;
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static NAME: &'static str = "tac";
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static VERSION: &'static str = "1.0.0";
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pub fn uumain(args: Vec<String>) -> int {
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let program = args.get(0).clone();
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let opts = [
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getopts::optflag("b", "before", "attach the separator before instead of after"),
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getopts::optflag("r", "regex", "interpret the sequence as a regular expression (NOT IMPLEMENTED)"),
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getopts::optopt("s", "separator", "use STRING as the separator instead of newline", "STRING"),
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getopts::optflag("h", "help", "display this help and exit"),
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getopts::optflag("V", "version", "output version information and exit")
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];
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let matches = match getopts::getopts(args.tail(), opts) {
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Ok(m) => m,
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Err(f) => crash!(1, "{}", f)
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};
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if matches.opt_present("help") {
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println!("tac {}", VERSION);
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println!("");
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println!("Usage:");
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println!(" {0:s} [OPTION]... [FILE]...", program);
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println!("");
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print!("{}", getopts::usage("Write each file to standard output, last line first.", opts));
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} else if matches.opt_present("version") {
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println!("tac {}", VERSION);
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} else {
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let before = matches.opt_present("b");
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let regex = matches.opt_present("r");
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let separator = match matches.opt_str("s") {
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Some(m) => {
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if m.len() == 0 {
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crash!(1, "separator cannot be empty")
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} else {
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m
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}
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}
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None => "\n".to_string()
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};
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let files = if matches.free.is_empty() {
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vec!("-".to_string())
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} else {
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matches.free
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};
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tac(files, before, regex, separator.as_slice());
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}
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0
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}
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fn tac(filenames: Vec<String>, before: bool, _: bool, separator: &str) {
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for filename in filenames.move_iter() {
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let mut file = io::BufferedReader::new(
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if filename.as_slice() == "-" {
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box io::stdio::stdin_raw() as Box<Reader>
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} else {
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box crash_if_err!(1, io::File::open(&Path::new(filename))) as Box<Reader>
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}
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);
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let mut data = crash_if_err!(1, file.read_to_str());
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if data.as_slice().ends_with("\n") {
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// removes blank line that is inserted otherwise
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let mut buf = data.into_string();
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let len = buf.len();
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buf.truncate(len - 1);
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data = buf.into_string();
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}
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let split_vec: Vec<&str> = data.as_slice().split_str(separator).collect();
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let rev: String = split_vec.iter().rev().fold(String::new(), |mut a, &b| {
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if before {
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a.push_str(separator);
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a.push_str(b);
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} else {
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a.push_str(b);
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a.push_str(separator);
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}
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a
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});
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print!("{}", rev);
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}
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}
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