RGBCube/uutils-coreutils
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Allow truncate to take --size and --reference

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This commit is contained in:
James Robson 2021-04-26 18:39:32 +01:00
parent 7dcc8c2960
commit a7037b1ca9
2 changed files with 52 additions and 22 deletions
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61
src/uu/truncate/src/truncate.rs
View file

@ -16,6 +16,7 @@ use std::path::Path;
#[derive(Eq, PartialEq)]
enum TruncateMode {
Absolute,
Reference,
Extend,
Reduce,
@ -131,18 +132,30 @@ fn truncate(
size: Option<String>,
filenames: Vec<String>,
) {
let (refsize, mode) = match reference {
Some(rfilename) => {
let _ = match File::open(Path::new(&rfilename)) {
let (modsize, mode) = match size {
Some(size_string) => parse_size(&size_string),
None => (0, TruncateMode::Reference),
};
let refsize = match reference {
Some(ref rfilename) => {
match mode {
// Only Some modes work with a reference
TruncateMode::Reference => (), //No --size was given
TruncateMode::Extend => (),
TruncateMode::Reduce => (),
_ => crash!(1, "you must specify a relative ‘--size’ with ‘--reference’"),
};
let _ = match File::open(Path::new(rfilename)) {
Ok(m) => m,
Err(f) => crash!(1, "{}", f.to_string()),
};
match metadata(rfilename) {
Ok(meta) => (meta.len(), TruncateMode::Reference),
Ok(meta) => meta.len(),
Err(f) => crash!(1, "{}", f.to_string()),
}
}
None => parse_size(size.unwrap().as_ref()),
None => 0,
};
for filename in &filenames {
let path = Path::new(filename);
@ -153,33 +166,37 @@ fn truncate(
.open(path)
{
Ok(file) => {
let fsize = match metadata(filename) {
Ok(meta) => meta.len(),
Err(f) => {
show_warning!("{}", f.to_string());
continue;
}
let fsize = match reference {
Some(_) => refsize,
None => match metadata(filename) {
Ok(meta) => meta.len(),
Err(f) => {
show_warning!("{}", f.to_string());
continue;
}
},
};
let tsize: u64 = match mode {
TruncateMode::Reference => refsize,
TruncateMode::Extend => fsize + refsize,
TruncateMode::Reduce => fsize - refsize,
TruncateMode::Absolute => modsize,
TruncateMode::Reference => fsize,
TruncateMode::Extend => fsize + modsize,
TruncateMode::Reduce => fsize - modsize,
TruncateMode::AtMost => {
if fsize > refsize {
refsize
if fsize > modsize {
modsize
} else {
fsize
}
}
TruncateMode::AtLeast => {
if fsize < refsize {
refsize
if fsize < modsize {
modsize
} else {
fsize
}
}
TruncateMode::RoundDown => fsize - fsize % refsize,
TruncateMode::RoundUp => fsize + fsize % refsize,
TruncateMode::RoundDown => fsize - fsize % modsize,
TruncateMode::RoundUp => fsize + fsize % modsize,
};
match file.set_len(tsize) {
Ok(_) => {}
@ -200,10 +217,10 @@ fn parse_size(size: &str) -> (u64, TruncateMode) {
'>' => TruncateMode::AtLeast,
'/' => TruncateMode::RoundDown,
'*' => TruncateMode::RoundUp,
_ => TruncateMode::Reference, /* assume that the size is just a number */
_ => TruncateMode::Absolute, /* assume that the size is just a number */
};
let bytes = {
let mut slice = if mode == TruncateMode::Reference {
let mut slice = if mode == TruncateMode::Absolute {
&clean_size
} else {
&clean_size[1..]

13
tests/by-util/test_truncate.rs
View file

@ -161,3 +161,16 @@ fn test_round_up() {
let actual = file.seek(SeekFrom::Current(0)).unwrap();
assert!(expected == actual, "expected '{}' got '{}'", expected, actual);
}
#[test]
fn test_size_and_reference() {
let expected = 15;
let (at, mut ucmd) = at_and_ucmd!();
let mut file1 = at.make_file(TFILE1);
let mut file2 = at.make_file(TFILE2);
file1.write_all(b"1234567890").unwrap();
ucmd.args(&["--reference", TFILE1, "--size", "+5", TFILE2]).succeeds();
file2.seek(SeekFrom::End(0)).unwrap();
let actual = file2.seek(SeekFrom::Current(0)).unwrap();
assert!(expected == actual, "expected '{}' got '{}'", expected, actual);
}