mirror of
https://github.com/uutils/coreutils
synced 2024-12-14 23:32:39 +00:00
77d92883c7
Implement the `--line-bytes` option to `split`. In this mode, the program tries to write as many lines of the input as possible to each chunk of output without exceeding a specified byte limit. The new `LineBytesChunkWriter` struct represents this functionality.
607 lines
18 KiB
Rust
607 lines
18 KiB
Rust
// * This file is part of the uutils coreutils package.
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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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// spell-checker:ignore xzaaa sixhundredfiftyonebytes ninetyonebytes threebytes asciilowercase fghij klmno pqrst uvwxyz fivelines twohundredfortyonebytes onehundredlines nbbbb
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extern crate rand;
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extern crate regex;
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use self::rand::{thread_rng, Rng};
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use self::regex::Regex;
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use crate::common::util::*;
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use rand::SeedableRng;
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#[cfg(not(windows))]
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use std::env;
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use std::path::Path;
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use std::{
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fs::{read_dir, File},
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io::{BufWriter, Read, Write},
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};
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fn random_chars(n: usize) -> String {
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thread_rng()
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.sample_iter(&rand::distributions::Alphanumeric)
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.map(char::from)
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.take(n)
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.collect::<String>()
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}
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struct Glob {
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directory: AtPath,
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regex: Regex,
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}
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impl Glob {
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fn new(at: &AtPath, directory: &str, regex: &str) -> Self {
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Self {
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directory: AtPath::new(Path::new(&at.plus_as_string(directory))),
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regex: Regex::new(regex).unwrap(),
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}
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}
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fn count(&self) -> usize {
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self.collect().len()
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}
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/// Get all files in `self.directory` that match `self.regex`
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fn collect(&self) -> Vec<String> {
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read_dir(Path::new(&self.directory.subdir))
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.unwrap()
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.filter_map(|entry| {
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let path = entry.unwrap().path();
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let name = self
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.directory
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.minus_as_string(path.as_path().to_str().unwrap_or(""));
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if self.regex.is_match(&name) {
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Some(name)
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} else {
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None
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}
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})
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.collect()
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}
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/// Accumulate bytes of all files in `self.collect()`
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fn collate(&self) -> Vec<u8> {
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let mut files = self.collect();
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files.sort();
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let mut data: Vec<u8> = vec![];
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for name in &files {
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data.extend(self.directory.read_bytes(name));
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}
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data
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}
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}
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/// File handle that user can add random bytes (line-formatted or not) to
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struct RandomFile {
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inner: File,
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}
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impl RandomFile {
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/// Size of each line that's being generated
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const LINESIZE: usize = 32;
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/// `create()` file handle located at `at` / `name`
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fn new(at: &AtPath, name: &str) -> Self {
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Self {
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inner: File::create(&at.plus(name)).unwrap(),
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}
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}
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fn add_bytes(&mut self, bytes: usize) {
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// Note that just writing random characters isn't enough to cover all
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// cases. We need truly random bytes.
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let mut writer = BufWriter::new(&self.inner);
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// Seed the rng so as to avoid spurious test failures.
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let mut rng = rand::rngs::StdRng::seed_from_u64(123);
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let mut buffer = [0; 1024];
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let mut remaining_size = bytes;
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while remaining_size > 0 {
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let to_write = std::cmp::min(remaining_size, buffer.len());
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let buf = &mut buffer[..to_write];
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rng.fill(buf);
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writer.write_all(buf).unwrap();
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remaining_size -= to_write;
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}
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}
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/// Add n lines each of size `RandomFile::LINESIZE`
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fn add_lines(&mut self, lines: usize) {
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let mut n = lines;
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while n > 0 {
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writeln!(self.inner, "{}", random_chars(Self::LINESIZE)).unwrap();
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n -= 1;
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}
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}
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}
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#[test]
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fn test_split_default() {
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "split_default";
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RandomFile::new(&at, name).add_lines(2000);
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ucmd.args(&[name]).succeeds();
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let glob = Glob::new(&at, ".", r"x[[:alpha:]][[:alpha:]]$");
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assert_eq!(glob.count(), 2);
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assert_eq!(glob.collate(), at.read_bytes(name));
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}
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#[test]
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fn test_split_numeric_prefixed_chunks_by_bytes() {
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "split_num_prefixed_chunks_by_bytes";
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RandomFile::new(&at, name).add_bytes(10000);
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ucmd.args(&[
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"-d", // --numeric-suffixes
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"-b", // --bytes
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"1000", name, "a",
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])
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.succeeds();
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let glob = Glob::new(&at, ".", r"a\d\d$");
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assert_eq!(glob.count(), 10);
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for filename in glob.collect() {
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assert_eq!(glob.directory.metadata(&filename).len(), 1000);
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}
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assert_eq!(glob.collate(), at.read_bytes(name));
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}
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#[test]
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fn test_split_str_prefixed_chunks_by_bytes() {
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "split_str_prefixed_chunks_by_bytes";
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RandomFile::new(&at, name).add_bytes(10000);
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// Important that this is less than 1024 since that's our internal buffer
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// size. Good to test that we don't overshoot.
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ucmd.args(&["-b", "1000", name, "b"]).succeeds();
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let glob = Glob::new(&at, ".", r"b[[:alpha:]][[:alpha:]]$");
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assert_eq!(glob.count(), 10);
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for filename in glob.collect() {
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assert_eq!(glob.directory.metadata(&filename).len(), 1000);
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}
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assert_eq!(glob.collate(), at.read_bytes(name));
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}
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// This is designed to test what happens when the desired part size is not a
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// multiple of the buffer size and we hopefully don't overshoot the desired part
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// size.
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#[test]
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fn test_split_bytes_prime_part_size() {
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "test_split_bytes_prime_part_size";
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RandomFile::new(&at, name).add_bytes(10000);
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// 1753 is prime and greater than the buffer size, 1024.
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ucmd.args(&["-b", "1753", name, "b"]).succeeds();
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let glob = Glob::new(&at, ".", r"b[[:alpha:]][[:alpha:]]$");
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assert_eq!(glob.count(), 6);
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let mut fns = glob.collect();
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// glob.collect() is not guaranteed to return in sorted order, so we sort.
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fns.sort();
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#[allow(clippy::needless_range_loop)]
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for i in 0..5 {
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assert_eq!(glob.directory.metadata(&fns[i]).len(), 1753);
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}
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assert_eq!(glob.directory.metadata(&fns[5]).len(), 1235);
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assert_eq!(glob.collate(), at.read_bytes(name));
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}
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#[test]
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fn test_split_num_prefixed_chunks_by_lines() {
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "split_num_prefixed_chunks_by_lines";
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RandomFile::new(&at, name).add_lines(10000);
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ucmd.args(&["-d", "-l", "1000", name, "c"]).succeeds();
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let glob = Glob::new(&at, ".", r"c\d\d$");
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assert_eq!(glob.count(), 10);
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assert_eq!(glob.collate(), at.read_bytes(name));
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}
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#[test]
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fn test_split_str_prefixed_chunks_by_lines() {
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "split_str_prefixed_chunks_by_lines";
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RandomFile::new(&at, name).add_lines(10000);
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ucmd.args(&["-l", "1000", name, "d"]).succeeds();
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let glob = Glob::new(&at, ".", r"d[[:alpha:]][[:alpha:]]$");
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assert_eq!(glob.count(), 10);
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assert_eq!(glob.collate(), at.read_bytes(name));
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}
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#[test]
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fn test_split_additional_suffix() {
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "split_additional_suffix";
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RandomFile::new(&at, name).add_lines(2000);
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ucmd.args(&["--additional-suffix", ".txt", name]).succeeds();
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let glob = Glob::new(&at, ".", r"x[[:alpha:]][[:alpha:]].txt$");
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assert_eq!(glob.count(), 2);
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assert_eq!(glob.collate(), at.read_bytes(name));
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}
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#[test]
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fn test_additional_suffix_no_slash() {
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new_ucmd!()
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.args(&["--additional-suffix", "a/b"])
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.fails()
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.usage_error("invalid suffix 'a/b', contains directory separator");
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}
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// note: the test_filter* tests below are unix-only
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// windows support has been waived for now because of the difficulty of getting
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// the `cmd` call right
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// see https://github.com/rust-lang/rust/issues/29494
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#[test]
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#[cfg(unix)]
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fn test_filter() {
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// like `test_split_default()` but run a command before writing
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "filtered";
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let n_lines = 3;
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RandomFile::new(&at, name).add_lines(n_lines);
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// change all characters to 'i'
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ucmd.args(&["--filter=sed s/./i/g > $FILE", name])
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.succeeds();
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// assert all characters are 'i' / no character is not 'i'
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// (assert that command succeeded)
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let glob = Glob::new(&at, ".", r"x[[:alpha:]][[:alpha:]]$");
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assert!(
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glob.collate().iter().find(|&&c| {
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// is not i
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c != (b'i')
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// is not newline
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&& c != (b'\n')
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}) == None
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);
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}
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#[test]
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#[cfg(unix)]
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fn test_filter_with_env_var_set() {
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// This test will ensure that if $FILE env var was set before running --filter, it'll stay that
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// way
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// implemented like `test_split_default()` but run a command before writing
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "filtered";
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let n_lines = 3;
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RandomFile::new(&at, name).add_lines(n_lines);
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let env_var_value = "some-value";
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env::set_var("FILE", &env_var_value);
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ucmd.args(&[format!("--filter={}", "cat > $FILE").as_str(), name])
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.succeeds();
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let glob = Glob::new(&at, ".", r"x[[:alpha:]][[:alpha:]]$");
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assert_eq!(glob.collate(), at.read_bytes(name));
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assert!(env::var("FILE").unwrap_or_else(|_| "var was unset".to_owned()) == env_var_value);
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}
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#[test]
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#[cfg(unix)]
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fn test_filter_command_fails() {
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let (at, mut ucmd) = at_and_ucmd!();
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let name = "filter-will-fail";
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RandomFile::new(&at, name).add_lines(4);
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ucmd.args(&["--filter=/a/path/that/totally/does/not/exist", name])
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.fails();
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}
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#[test]
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fn test_split_lines_number() {
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// Test if stdout/stderr for '--lines' option is correct
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let scene = TestScenario::new(util_name!());
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let at = &scene.fixtures;
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at.touch("file");
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scene
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.ucmd()
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.args(&["--lines", "2", "file"])
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.succeeds()
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.no_stderr()
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.no_stdout();
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scene
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.ucmd()
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.args(&["--lines", "2fb", "file"])
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.fails()
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.code_is(1)
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.stderr_only("split: invalid number of lines: '2fb'");
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}
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#[test]
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fn test_split_invalid_bytes_size() {
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new_ucmd!()
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.args(&["-b", "1024R"])
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.fails()
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.code_is(1)
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.stderr_only("split: invalid number of bytes: '1024R'");
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#[cfg(not(target_pointer_width = "128"))]
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new_ucmd!()
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.args(&["-b", "1Y"])
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.fails()
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.code_is(1)
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.stderr_only("split: invalid number of bytes: '1Y': Value too large for defined data type");
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#[cfg(target_pointer_width = "32")]
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{
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let sizes = ["1000G", "10T"];
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for size in &sizes {
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new_ucmd!().args(&["-b", size]).succeeds();
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}
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}
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}
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#[test]
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fn test_split_chunks_num_chunks_oversized_32() {
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#[cfg(target_pointer_width = "32")]
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{
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let scene = TestScenario::new(util_name!());
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let at = &scene.fixtures;
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at.touch("file");
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scene
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.ucmd()
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.args(&["--number", "5000000000", "file"])
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.fails()
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.code_is(1)
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.stderr_only("split: Number of chunks too big");
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}
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}
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#[test]
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fn test_split_stdin_num_chunks() {
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new_ucmd!()
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.args(&["--number=1"])
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.fails()
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.code_is(1)
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.stderr_only("split: -: cannot determine file size");
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}
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fn file_read(at: &AtPath, filename: &str) -> String {
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let mut s = String::new();
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at.open(filename).read_to_string(&mut s).unwrap();
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s
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}
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// TODO Use char::from_digit() in Rust v1.51.0 or later.
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fn char_from_digit(n: usize) -> char {
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(b'a' + n as u8) as char
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}
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/// Test for the default suffix length behavior: dynamically increasing size.
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#[test]
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fn test_alphabetic_dynamic_suffix_length() {
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let (at, mut ucmd) = at_and_ucmd!();
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// Split into chunks of one byte each.
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//
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// The input file has (26^2) - 26 + 1 = 651 bytes. This is just
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// enough to force `split` to dynamically increase the length of
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// the filename for the very last chunk.
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//
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// We expect the output files to be named
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//
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// xaa, xab, xac, ..., xyx, xyy, xyz, xzaaa
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//
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ucmd.args(&["-b", "1", "sixhundredfiftyonebytes.txt"])
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.succeeds();
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for i in 0..25 {
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for j in 0..26 {
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let filename = format!("x{}{}", char_from_digit(i), char_from_digit(j),);
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let contents = file_read(&at, &filename);
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assert_eq!(contents, "a");
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}
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}
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assert_eq!(file_read(&at, "xzaaa"), "a");
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}
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/// Test for the default suffix length behavior: dynamically increasing size.
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#[test]
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fn test_numeric_dynamic_suffix_length() {
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let (at, mut ucmd) = at_and_ucmd!();
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// Split into chunks of one byte each, use numbers instead of
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// letters as file suffixes.
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//
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// The input file has (10^2) - 10 + 1 = 91 bytes. This is just
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// enough to force `split` to dynamically increase the length of
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// the filename for the very last chunk.
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//
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// x00, x01, x02, ..., x87, x88, x89, x9000
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//
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ucmd.args(&["-d", "-b", "1", "ninetyonebytes.txt"])
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.succeeds();
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for i in 0..90 {
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let filename = format!("x{:02}", i);
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let contents = file_read(&at, &filename);
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assert_eq!(contents, "a");
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}
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assert_eq!(file_read(&at, "x9000"), "a");
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}
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#[test]
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fn test_hex_dynamic_suffix_length() {
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let (at, mut ucmd) = at_and_ucmd!();
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// Split into chunks of one byte each, use hexadecimal digits
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// instead of letters as file suffixes.
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//
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// The input file has (16^2) - 16 + 1 = 241 bytes. This is just
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// enough to force `split` to dynamically increase the length of
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// the filename for the very last chunk.
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//
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// x00, x01, x02, ..., xed, xee, xef, xf000
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//
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ucmd.args(&["-x", "-b", "1", "twohundredfortyonebytes.txt"])
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.succeeds();
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for i in 0..240 {
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let filename = format!("x{:02x}", i);
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let contents = file_read(&at, &filename);
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assert_eq!(contents, "a");
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}
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assert_eq!(file_read(&at, "xf000"), "a");
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}
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#[test]
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fn test_suffixes_exhausted() {
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new_ucmd!()
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.args(&["-b", "1", "-a", "1", "asciilowercase.txt"])
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.fails()
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.stderr_only("split: output file suffixes exhausted");
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}
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#[test]
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fn test_verbose() {
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new_ucmd!()
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.args(&["-b", "5", "--verbose", "asciilowercase.txt"])
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.succeeds()
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.stdout_only(
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"creating file 'xaa'
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creating file 'xab'
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creating file 'xac'
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creating file 'xad'
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creating file 'xae'
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creating file 'xaf'
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",
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);
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}
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#[test]
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fn test_number() {
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let (at, mut ucmd) = at_and_ucmd!();
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let file_read = |f| {
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let mut s = String::new();
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at.open(f).read_to_string(&mut s).unwrap();
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s
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};
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ucmd.args(&["-n", "5", "asciilowercase.txt"]).succeeds();
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assert_eq!(file_read("xaa"), "abcde");
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assert_eq!(file_read("xab"), "fghij");
|
|
assert_eq!(file_read("xac"), "klmno");
|
|
assert_eq!(file_read("xad"), "pqrst");
|
|
assert_eq!(file_read("xae"), "uvwxyz\n");
|
|
}
|
|
|
|
#[test]
|
|
fn test_split_number_with_io_blksize() {
|
|
let (at, mut ucmd) = at_and_ucmd!();
|
|
let file_read = |f| {
|
|
let mut s = String::new();
|
|
at.open(f).read_to_string(&mut s).unwrap();
|
|
s
|
|
};
|
|
ucmd.args(&["-n", "5", "asciilowercase.txt", "---io-blksize", "1024"])
|
|
.succeeds();
|
|
assert_eq!(file_read("xaa"), "abcde");
|
|
assert_eq!(file_read("xab"), "fghij");
|
|
assert_eq!(file_read("xac"), "klmno");
|
|
assert_eq!(file_read("xad"), "pqrst");
|
|
assert_eq!(file_read("xae"), "uvwxyz\n");
|
|
}
|
|
|
|
#[test]
|
|
fn test_split_default_with_io_blksize() {
|
|
let (at, mut ucmd) = at_and_ucmd!();
|
|
let name = "split_default_with_io_blksize";
|
|
RandomFile::new(&at, name).add_lines(2000);
|
|
ucmd.args(&[name, "---io-blksize", "2M"]).succeeds();
|
|
|
|
let glob = Glob::new(&at, ".", r"x[[:alpha:]][[:alpha:]]$");
|
|
assert_eq!(glob.count(), 2);
|
|
assert_eq!(glob.collate(), at.read_bytes(name));
|
|
}
|
|
|
|
#[test]
|
|
fn test_invalid_suffix_length() {
|
|
new_ucmd!()
|
|
.args(&["-a", "xyz"])
|
|
.fails()
|
|
.no_stdout()
|
|
.stderr_contains("invalid suffix length: 'xyz'");
|
|
}
|
|
|
|
#[test]
|
|
fn test_include_newlines() {
|
|
let (at, mut ucmd) = at_and_ucmd!();
|
|
ucmd.args(&["-l", "2", "fivelines.txt"]).succeeds();
|
|
|
|
let mut s = String::new();
|
|
at.open("xaa").read_to_string(&mut s).unwrap();
|
|
assert_eq!(s, "1\n2\n");
|
|
|
|
let mut s = String::new();
|
|
at.open("xab").read_to_string(&mut s).unwrap();
|
|
assert_eq!(s, "3\n4\n");
|
|
|
|
let mut s = String::new();
|
|
at.open("xac").read_to_string(&mut s).unwrap();
|
|
assert_eq!(s, "5\n");
|
|
}
|
|
|
|
#[test]
|
|
fn test_allow_empty_files() {
|
|
let (at, mut ucmd) = at_and_ucmd!();
|
|
ucmd.args(&["-n", "4", "threebytes.txt"])
|
|
.succeeds()
|
|
.no_stdout()
|
|
.no_stderr();
|
|
assert_eq!(at.read("xaa"), "a");
|
|
assert_eq!(at.read("xab"), "b");
|
|
assert_eq!(at.read("xac"), "c");
|
|
assert_eq!(at.read("xad"), "");
|
|
}
|
|
|
|
#[test]
|
|
fn test_elide_empty_files() {
|
|
let (at, mut ucmd) = at_and_ucmd!();
|
|
ucmd.args(&["-e", "-n", "4", "threebytes.txt"])
|
|
.succeeds()
|
|
.no_stdout()
|
|
.no_stderr();
|
|
assert_eq!(at.read("xaa"), "a");
|
|
assert_eq!(at.read("xab"), "b");
|
|
assert_eq!(at.read("xac"), "c");
|
|
assert!(!at.plus("xad").exists());
|
|
}
|
|
|
|
#[test]
|
|
fn test_lines() {
|
|
let (at, mut ucmd) = at_and_ucmd!();
|
|
|
|
let file_read = |f| {
|
|
let mut s = String::new();
|
|
at.open(f).read_to_string(&mut s).unwrap();
|
|
s
|
|
};
|
|
|
|
// Split into two files without splitting up lines.
|
|
ucmd.args(&["-n", "l/2", "fivelines.txt"]).succeeds();
|
|
|
|
assert_eq!(file_read("xaa"), "1\n2\n3\n");
|
|
assert_eq!(file_read("xab"), "4\n5\n");
|
|
}
|
|
|
|
#[test]
|
|
fn test_lines_kth() {
|
|
new_ucmd!()
|
|
.args(&["-n", "l/3/10", "onehundredlines.txt"])
|
|
.succeeds()
|
|
.stdout_only("20\n21\n22\n23\n24\n25\n26\n27\n28\n29\n");
|
|
}
|
|
|
|
#[test]
|
|
fn test_line_bytes() {
|
|
let (at, mut ucmd) = at_and_ucmd!();
|
|
ucmd.args(&["-C", "8", "letters.txt"]).succeeds();
|
|
assert_eq!(at.read("xaa"), "aaaaaaaa");
|
|
assert_eq!(at.read("xab"), "a\nbbbb\n");
|
|
assert_eq!(at.read("xac"), "cccc\ndd\n");
|
|
assert_eq!(at.read("xad"), "ee\n");
|
|
}
|