stat: fix precision when rendering mtime (%Y) #7115
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Support precision when rendering the time of last data modification
with `stat`. For example, after this commit
$ stat --printf='%.1Y\n' f
1668645806.7
Previously, the precision in the format specification was
ignored. This is implemented with a custom renderer because GNU `stat`
seems to truncate the number as opposed to rounding the number as
would happen when using `format!` with a specified number of digits of
precision.
Fixes uutils#3233
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Sweet, i was working on it but your implementation is better than mine :) Could you please add this test? It covers more cases |
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Yes, I'll definitely add those tests, thank you. Sorry for the overlapping work.
…On Saturday, January 11th, 2025 at 4:39 AM, Sylvestre Ledru ***@***.***> wrote:
Sweet, i was working on it but your implementation is better than mine :)
Could you please add this test? It covers more cases
#[cfg(feature = "touch")]
#[test]
fn test_timestamp_format() {
let ts = TestScenario::new(util_name!());
// Create a file with a specific timestamp for testing
ts.ccmd("touch")
.args(&["-d", "1970-01-01 18:43:33.023456789", "k"])
.succeeds()
.no_stderr();
let test_cases = vec![
// Basic timestamp formats
("%Y", "67413"),
("%.Y", "67413.023456789"),
("%.1Y", "67413.0"),
("%.3Y", "67413.023"),
("%.6Y", "67413.023456"),
("%.9Y", "67413.023456789"),
// Width and padding tests
("%13.6Y", " 67413.023456"),
("%013.6Y", "067413.023456"),
("%-13.6Y", "67413.023456 "),
// Longer width/precision combinations
("%18.10Y", " 67413.0234567890"),
("%I18.10Y", " 67413.0234567890"),
("%018.10Y", "0067413.0234567890"),
("%-18.10Y", "67413.0234567890 "),
];
for (format_str, expected) in test_cases {
let result = ts
.ucmd()
.args(&["-c", format_str, "k"])
.succeeds()
.stdout_move_str();
assert_eq!(
result.trim(),
expected,
"Format '{}' failed.\nExpected: '{}'\nGot: '{}'",
format_str,
expected,
result.trim()
);
}
}
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In order to pass the new test cases, I needed to update the code a bit. There is now a There is still a few aspects of the code that are not quite right, but I think they can be fixed in separate pull requests. First, there is some numerical inaccuracy between getting the |
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Yeah, it is surprisingly complex :) |
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GNU testsuite comparison: |
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Support precision when rendering the time of last data modification with
stat. For example, after this commitPreviously, the precision in the format specification was ignored. This is implemented with a custom renderer because GNU
statseems to truncate the number as opposed to rounding the number as would happen when usingformat!with a specified number of digits of precision.Fixes #3233