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Three limit problems in the find and ls tools.
**1. `limit: 0` and other values below 1.** find passed `limit` to fd
unchanged. fd treats `--max-results 0` as no limit, so `find({ pattern:
"*", limit: 0 })` returned every match, followed by `[0 results limit
reached. Use limit=0 for more, or refine pattern]`. ls with `limit: 0`
listed nothing and printed `(empty directory)`. A fractional limit such
as `1.5` printed `1.5 results limit reached. Use limit=3`.
Fix: both tools use `Math.max(1, Math.floor(limit ?? DEFAULT_LIMIT))`.
grep already clamps to at least 1. The fd path and the custom `glob`
path share this value.
**2. Notice at exactly N results (#7121).** With 3 matching files and
`limit: 3`, fd returned 3 results. find checked `results >= limit` and
printed `[3 results limit reached. Use limit=6 for more, or refine
pattern]`, even though there were no more files.
Fix: find asks fd for `limit + 1` results, shows the first `limit`, and
prints the notice only when the extra result exists. ls already worked
this way. Custom `FindOperations.glob` now also gets `limit + 1`. The
tool shows at most `limit` of the returned results and prints the notice
only when more were returned. The interface is unchanged. This follows
closed PR #7122 without its unrelated changes.
**3. Results past the 50KB cap.** find kept every fd line in memory.
`truncateHead` then dropped everything past 50KB. find now handles each
line as it arrives. It keeps lines up to the first one past the cap and
only counts the rest, as grep does in #11705. Because that first line
past the cap is kept, `truncateHead` makes the same truncation decision
as before. `details.truncation.totalLines` and `totalBytes` come from
the counts, so the notices and `details` are unchanged.
Behavior differences:
- A custom `glob` that ignores `options.limit` and returns more results
used to have all of them shown. Now the tool shows the first `limit`
results with the limit notice.
- Custom `glob` implementations get `limit + 1` instead of `limit`.
- In the fd path, output made only of blank lines with exit code 0 now
gives `No files found matching pattern` instead of empty text. fd does
not produce such output.
**Testing**
- New tests in `test/tools.test.ts`:
- find: exactly N matches gives no notice, and N+1 matches give the
notice with N lines (#7121). Fails on main.
- find: `limit` 0, -5, 0.5 and 1.9 each show 1 result with the `1
results` notice. Fails on main.
- find with custom `glob`: the operation gets `limit + 1`, and exact and
over-limit results give the right output. Fails on main.
- find past the byte cap: 300 names of 200 bytes each.
`details.truncation` equals `truncateHead` of the full output, except
for `content`. Passes on main too; it guards the counting. It fails if
the `totalLines` override is removed.
- ls: `limit` 0, -5, 0.5 and 1.9 each list 1 entry with the notice.
Fails on main.
- ls: exactly N entries gives no notice. Passes on main too; it guards
the existing behavior.
- `test/tools.test.ts` and the find regression suites 3302, 3303 and
6104 pass (110 tests). `npm run check` passes.
fixes #7121
This PR is AI-generated.
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