Note: This feature has been assessed and deferred as low priority. These questions are documented for future reference if/when this feature is reconsidered.
Please answer these questions if you decide to implement this feature:
Current State:
- Sequential execution: ~13 seconds
- Parallel execution potential: ~9 seconds (~30% faster, 4s improvement)
Questions:
- Is the current ~13s execution time causing problems for developers?
- Have users complained about linting speed?
- Is CI/CD pipeline time a concern where this 4s would matter?
- What performance threshold would justify the implementation complexity?
Your Answer:
- Is the current ~13s execution time causing problems for developers?
Not really, it's acceptable for a pre-commit hook.
- Have users complained about linting speed?
No. I'm the only developer using it for now.
- Is CI/CD pipeline time a concern where this 4s would matter?
No, it's not a concern.
- What performance threshold would justify the implementation complexity?
If we had more linters added in the future, making the total time significantly longer (e.g., >25s), then parallel execution would be more justified.
Challenge: Current linters print errors immediately using println!() and eprintln!(). Parallel execution would create messy, interleaved output.
Solution Options:
- Option A: Refactor all linters to buffer output, display sequentially after parallel execution
- Option B: Use a synchronized output mechanism (mutex-protected stdout)
- Option C: Implement structured logging that handles concurrent output (e.g.,
tracingwith proper formatting)
Questions:
- Which output handling approach do you prefer?
- Should we maintain the current output format exactly, or can we redesign it?
- Is the current
println!()/eprintln!()approach acceptable to keep (which would rule out naive parallelization)?
Your Answer:
- Which output handling approach do you prefer?
I prefer Option B.
- Should we maintain the current output format exactly, or can we redesign it?
I would keep the current one unless it's too complex to implement as-is.
- Is the current
println!()/eprintln!()approach acceptable to keep (which would rule out naive parallelization)?
Mixing metadata (e.g., "Running linter X") is not a problem. The issue is mixing error reporting from different linters. We can collect the output from each linter and print it sequentially after all linters finish.
Proposed Groups:
- Group 1 (Parallel): markdown, yaml, toml, shellcheck, cspell
- Group 2 (Sequential): clippy → rustfmt
Questions:
- Is this grouping strategy correct?
- Should cspell (read-only, checks all files) be in a separate group?
- Are there any other file conflicts we haven't identified?
- Should we make grouping configurable?
Your Answer:
- Is this grouping strategy correct?
We can include "rustfmt" in the first group since it only modifies *.rs files, and clippy is the only one that needs to be in the sequential group.
- Should cspell (read-only, checks all files) be in a separate group?
Yes, cspell can be in its own group since it doesn't modify any files and can run safely in parallel with others.
- Are there any other file conflicts we haven't identified?
No, I do not see any other conflicts.
- Should we make grouping configurable?
No, the current grouping is sufficient for now.
Options:
- Option A:
tokio- Most popular, full-featured - Option B:
async-std- Alternative async runtime - Option C:
rayon- Data parallelism (simpler, no async/await)
Questions:
- Which async/parallel runtime should we use?
- Is adding
tokioas a dependency acceptable? - Would
rayonbe simpler since we don't need async I/O, just parallel execution?
Your Answer:
- Which async/parallel runtime should we use?
I think we should use tokio since it's the most popular and full-featured.
- Is adding
tokioas a dependency acceptable?
Yes, adding tokio is acceptable.
- Would
rayonbe simpler since we don't need async I/O, just parallel execution?
It could be simpler, but I prefer tokio for its ecosystem and flexibility.
Required Changes:
- All 7 linter modules need refactoring
- Create output buffering system
- Update error handling for parallel scenarios
- Add comprehensive testing
Questions:
- Should we refactor all linters at once, or incrementally?
- Start with a proof-of-concept (1-2 linters) first?
- What's the acceptable timeline for this refactoring?
Your Answer:
- Should we refactor all linters at once, or incrementally?
No, I think we should refactor them incrementally, one at a time, to ensure each linter works correctly before moving to the next. And commit the changes incrementally.
- Start with a proof-of-concept (1-2 linters) first?
Yes, starting with a proof-of-concept using 1-2 linters would be a good approach to validate the output handling and performance improvement.
- What's the acceptable timeline for this refactoring?
One day.
Integration:
pub async fn run_all_linters_parallel(fix: bool) -> Result<()> {
// Parallel execution with optional auto-fix
// Group 1: Parallel with fix support
// Group 2: Sequential (clippy, rustfmt)
}Questions:
- Should parallel execution support auto-fix from the start, or add it later?
- Any concerns about auto-fix + parallel execution interaction?
- Should parallel execution be opt-in (flag) or default behavior?
Your Answer:
- Should parallel execution support auto-fix from the start, or add it later?
Yes, auto-fix should be supported from the start. Auto-fix is going to be implemented first, and it's a more valuable feature.
- Any concerns about auto-fix + parallel execution interaction?
No, I don't foresee any major issues. As long as each linter's output is properly isolated, there shouldn't be any conflicts.
- Should parallel execution be opt-in (flag) or default behavior?
No, I think it should be the default behavior once implemented.
Test Scenarios:
- Parallel execution with all linters passing
- Parallel execution with some linters failing
- Output ordering and formatting
- Race conditions and file conflicts
- Integration with auto-fix (if applicable)
Questions:
- What level of testing is required before merging?
- Should we test on different machines/OSes for timing issues?
- How do we verify output is clean and not interleaved?
Your Answer:
- What level of testing is required before merging?
Testing parallel execution is hard. I would add an extra option to run the linters sequentially for testing purposes.
- Should we test on different machines/OSes for timing issues?
No, not necessary.
- How do we verify output is clean and not interleaved?
We will test it manually and visually verify the output.
Scenarios:
- One linter fails in parallel group - continue with others?
- Async task panics - how to handle?
- Output buffering fails - fallback to sequential?
Questions:
- How should errors in parallel tasks be aggregated?
- Should one failure stop all linters, or continue and report all failures?
- What's the fallback strategy if parallel execution fails?
Your Answer:
- One linter fails in parallel group - continue with others?
Yes, continue with others.
- Async task panics - how to handle?
We should catch panics and report them as errors without crashing the entire process. Although panics should be rare if we handle errors properly.
- Output buffering fails - fallback to sequential?
Yes, if output buffering fails, we can fallback to sequential execution as a safe fallback.
Options:
- Make parallelization configurable via CLI flag:
--parallel/--sequential - Configuration file setting
- Environment variable
- Always parallel (no option)
Questions:
- Should parallel execution be opt-in or default?
- Do we need a way to disable it for debugging?
- Should users be able to configure grouping strategy?
Your Answer:
- Should parallel execution be opt-in or default?
It should be default, but optionally can be disabled with a flag.
- Do we need a way to disable it for debugging?
Yes, we should have a way to disable it for debugging purposes.
- Should users be able to configure grouping strategy?
Not necessary for now.
Current Decision: Deferred as low priority
Questions:
- What would need to change to make this a higher priority?
- Is there a specific timeline when this might be reconsidered?
- What other features should be completed before this?
Your Answer:
- What would need to change to make this a higher priority?
If the auto-fix process takes too long, then we might reconsider this feature to speed it up. Or if we add more linters that increase the total linting time significantly.
- Is there a specific timeline when this might be reconsidered?
When the execution time goes over 25 seconds.
- What other features should be completed before this?
The auto-fix feature should be completed first.
Based on the cost-benefit analysis in the specification:
- ✅ Current performance (~13s) is acceptable
- ❌ Implementation complexity is significant
- ❌ Risk of bugs during refactoring
- ✅ YAGNI principle applies - implement only if needed
- ✅ Focus on auto-fix feature first (higher value)
Recommendation: Keep this feature deferred unless circumstances change (more linters added, performance complaints, CI/CD optimization becomes critical, etc.)
Once you've answered these questions and decided to implement:
- Create proof-of-concept with 1-2 linters
- Validate output handling approach
- Measure actual performance improvement
- Create detailed implementation plan
- Begin incremental refactoring
- Test thoroughly before merging