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split: implement -n option

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Implement the `-n` command-line option to `split`, which splits a file
into a specified number of chunks by byte.
This commit is contained in:
Jeffrey Finkelstein 2022-01-02 19:31:43 -05:00
parent b816e80e2f
commit b636ff04a0
4 changed files with 144 additions and 27 deletions
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21
tests/by-util/test_split.rs
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@ -2,7 +2,7 @@
// *
// * For the full copyright and license information, please view the LICENSE
// * file that was distributed with this source code.
// spell-checker:ignore xzaaa sixhundredfiftyonebytes ninetyonebytes asciilowercase
// spell-checker:ignore xzaaa sixhundredfiftyonebytes ninetyonebytes asciilowercase fghij klmno pqrst uvwxyz
extern crate rand;
extern crate regex;
@ -12,11 +12,10 @@ use crate::common::util::*;
use rand::SeedableRng;
#[cfg(not(windows))]
use std::env;
use std::io::Write;
use std::path::Path;
use std::{
fs::{read_dir, File},
io::{BufWriter, Read},
io::{BufWriter, Read, Write},
};
fn random_chars(n: usize) -> String {
@ -425,3 +424,19 @@ creating file 'xaf'
",
);
}
#[test]
fn test_number() {
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"]).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");
}