[sylvestre]

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Copilot review overview

3 open issues

• for arg in self.option_args moves option_args out of self, which will not compile if this… · New
• The docstring says \"control characters\" trigger quoting/escaping, but needs_quotes does not… · New
• This allocates a temporary String for every escaped byte. Since this runs per-byte, it’s more… · New

_{Review effort: Lite}

[codspeed]

Merging this PR will degrade performance by 6.91%

3 warnings

⚠️ 24 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

⚠️ 19 benchmarks with a significant change ran on different hardware

Their base and head results were measured on machines with a different CPU, core count or memory, so the changes might not come from the code. Run base and head on the same runner type.

Learn more about Macro Runners

See affected benchmarks

⚠️ 19 benchmarks with a significant change ran in a different software environment

Their base and head results were measured with a different OS or toolchain, such as compiler, runtime or library versions, so the changes might come from this difference rather than from the code. Open an affected benchmark to see what changed.

See affected benchmarks

⚡ 3 improved benchmarks
❌ 16 regressed benchmarks
✅ 7 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	cmd_diff_release_equal[25000]	24.3 µs	27.7 µs	-12.33%
❌	cmd_diff_gnu_equal[25000]	22.9 µs	25.9 µs	-11.4%
❌	cmd_diff_gnu_equal[10000]	23 µs	25.8 µs	-11.01%
❌	cmd_cmp_release_equal[25000]	24.4 µs	27.2 µs	-10.39%
❌	cmd_cmp_gnu_equal[25000]	22.9 µs	25.6 µs	-10.38%
❌	cmd_cmp_gnu_equal[10000]	23 µs	25.6 µs	-10.16%
❌	cmd_diff_release_equal[1000]	24.7 µs	27.5 µs	-10.16%
❌	cmd_diff_gnu_equal[100]	22.6 µs	25 µs	-9.95%
❌	cmd_diff_release_equal[10000]	24.2 µs	26.9 µs	-9.89%
❌	cmd_cmp_release_equal[1000]	24.6 µs	27.3 µs	-9.79%
❌	cmd_diff_gnu_equal[1000]	22.6 µs	25 µs	-9.52%
❌	cmd_cmp_release_equal[10000]	24.7 µs	27.2 µs	-9.17%
❌	cmd_diff_release_equal[100]	24.6 µs	27 µs	-9.14%
❌	cmd_cmp_release_equal[100]	25.3 µs	27.1 µs	-6.67%
❌	cmd_cmp_gnu_equal[100]	22.8 µs	24.4 µs	-6.66%
❌	cmd_cmp_gnu_equal[1000]	22.8 µs	24.3 µs	-6.24%
⚡	cmp_parser	12.4 µs	10.7 µs	+15.11%
⚡	diff_parser	6.1 ms	5.7 ms	+7.89%
⚡	cmp_compare_files_different[100]	79.3 µs	76.8 µs	+3.22%

Tip

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

---

_{Comparing diff-quote-names (5e71b16) with diff-recursive (2cfca73)¹}

Footnotes

1. No successful run was found on diff-recursive (7cada7e) during the generation of this report, so 3fb615a was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[github-actions]

GNU diffutils testsuite comparison:

Test results comparison:
  Current:   TOTAL: 33 / PASSED: 16 / FAILED: 13 / SKIPPED: 4
  Reference: TOTAL: 33 / PASSED: 8 / FAILED: 21 / SKIPPED: 4

Changes from main branch:
  TOTAL: +0
  PASSED: +8
  FAILED: -8

Test improvements (8):
  + binary
  + colors
  + excess-slash
  + filename-quoting
  + function-line-vs-leading-space
  + label-vs-func
  + new-file
  + stdin