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Improves commands that support range input (#13113)

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# Description
Fixes: #13105
Fixes: #13077

This pr makes `str substring`, `bytes at` work better with negative
index.

And it also fixes the false range semantic on `detect columns -c` in
some cases.

# User-Facing Changes
For `str substring`, `bytes at`, it will no-longer return an error if
start index is larger than end index. It makes sense to return an empty
string of empty bytes directly.

### Before
```nushell
# str substring
❯ ("aaa" | str substring 2..-3) == ""
Error: nu:🐚:type_mismatch

  × Type mismatch.
   ╭─[entry #23:1:10]
 1 │ ("aaa" | str substring 2..-3) == ""
   ·          ──────┬──────
   ·                ╰── End must be greater than or equal to Start
 2 │ true
   ╰────

# bytes at
❯ ("aaa" | encode utf-8 | bytes at 2..-3) == ("" | encode utf-8)
Error: nu:🐚:type_mismatch

  × Type mismatch.
   ╭─[entry #27:1:25]
 1 │ ("aaa" | encode utf-8 | bytes at 2..-3) == ("" | encode utf-8)
   ·                         ────┬───
   ·                             ╰── End must be greater than or equal to Start
   ╰────
```
### After
```nushell
# str substring
❯ ("aaa" | str substring 2..-3) == ""
true

# bytes at
❯  ("aaa" | encode utf-8 | bytes at 2..-3) == ("" | encode utf-8)
true
```
# Tests + Formatting
Added some tests, adjust existing tests
This commit is contained in:
Wind
2024-06-18 20:19:13 +08:00
committed by GitHub
parent ae6489f04b
commit 28ed0fe700
5 changed files with 85 additions and 98 deletions
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5
crates/nu-cmd-base/src/util.rs
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@ -20,13 +20,14 @@ pub fn get_guaranteed_cwd(engine_state: &EngineState, stack: &Stack) -> PathBuf
type MakeRangeError = fn(&str, Span) -> ShellError;
/// Returns a inclusive pair of boundary in given `range`.
pub fn process_range(range: &Range) -> Result<(isize, isize), MakeRangeError> {
match range {
Range::IntRange(range) => {
let start = range.start().try_into().unwrap_or(0);
let end = match range.end() {
Bound::Included(v) => (v + 1) as isize,
Bound::Excluded(v) => v as isize,
Bound::Included(v) => v as isize,
Bound::Excluded(v) => (v - 1) as isize,
Bound::Unbounded => isize::MAX,
};
Ok((start, end))