Create the diff -y utility, this time introducing tests and changes focused
mainly on the construction of the utility and issues related to alignment
and response tabulation. New parameters were introduced such as the size
of the total width of the output in the parameters. A new calculation was
introduced to determine the size of the output columns and the maximum
total column size. The tab and spacing mechanism has the same behavior
as the original diff, with tabs and spaces formatted in the same way.
- Introducing tests for the diff 'main' function
- Introducing fuzzing for side diff utility
- Introducing tests for internal mechanisms
- Modular functions that allow consistent changes across the entire project
The utility should support all the arguments supported by GNU cmp and
perform slightly better.
On a "bad" scenario, ~36M files which are completely different, our
version runs in ~72% of the time of the original on my M1 Max:
> hyperfine --warmup 1 -i --output=pipe \
'cmp -l huge huge.3'
Benchmark 1: cmp -l huge huge.3
Time (mean ± σ): 3.237 s ± 0.014 s [User: 2.891 s, System: 0.341 s]
Range (min … max): 3.221 s … 3.271 s 10 runs
Warning: Ignoring non-zero exit code.
> hyperfine --warmup 1 -i --output=pipe \
'../target/release/diffutils cmp -l huge huge.3'
Benchmark 1: ../target/release/diffutils cmp -l huge huge.3
Time (mean ± σ): 2.392 s ± 0.009 s [User: 1.978 s, System: 0.406 s]
Range (min … max): 2.378 s … 2.406 s 10 runs
Warning: Ignoring non-zero exit code.
Our cmp runs in ~116% of the time when comparing libxul.so to the
chromium-browser binary with -l and -b. In a best case scenario of
comparing 2 files which are the same except for the last byte, our
tool is slightly faster.
pocopepe