find: share output files across actions

[ruidosujeira]

Fixes #777.

Summary

• Open and truncate each output path only once while building the matcher tree.
• Reuse cloned file handles so -fprint, -fprintf, -fprint0, and -fls share the same file cursor.
• Prevent multiple output actions targeting the same file from overwriting each other's data.
• Add a regression test combining -fprintf and -fprint0 with the same output file.

Testing

• cargo test --lib --test test_find
• cargo fmt --all -- --check

All 234 unit tests and 71 find integration tests pass.

[Copilot]

Pull request overview

This PR fixes a find output corruption bug when multiple output actions (e.g., -fprintf and -fprint0) target the same output file by ensuring those actions share a single underlying file cursor rather than independently truncating/overwriting the file.

Changes:

• Thread an output_files map through matcher-tree construction to open/truncate each output path only once and reuse cloned handles.
• Update -fprint, -fprintf, -fprint0, and -fls to use the shared output-file handle logic.
• Add an integration regression test that combines -fprintf and -fprint0 writing to the same output file and asserts correct concatenated output.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/find/matchers/mod.rs	Cache output File handles by path during matcher construction and return cloned handles that share the same cursor across output actions.
tests/test_find.rs	Add regression coverage verifying -fprintf and -fprint0 can safely share the same output file without truncation/overwrites.

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[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.29%. Comparing base (f5f0f64) to head (104a111).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/find/matchers/mod.rs	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #846      +/-   ##
==========================================
+ Coverage   92.27%   92.29%   +0.01%     
==========================================
  Files          35       35              
  Lines        7435     7447      +12     
  Branches      386      387       +1     
==========================================
+ Hits         6861     6873      +12     
  Misses        433      433              
  Partials      141      141              

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[codspeed-hq]

Merging this PR will degrade performance by 14.66%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark
✅ 19 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	printf	31.6 ms	37.1 ms	-14.66%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing ruidosujeira:fix/777-shared-output-file (104a111) with main (f5f0f64)}