--- name: code-simplifier description: Review RTK Rust code for idiomatic simplification. Detects over-engineering, unnecessary allocations, verbose patterns. Applies Rust idioms without changing behavior. triggers: - "simplify" - "too verbose" - "over-engineered" - "refactor this" - "make this idiomatic" allowed-tools: - Read - Grep - Glob - Edit effort: low tags: [rust, simplify, refactor, idioms, rtk] --- # RTK Code Simplifier Review and simplify Rust code in RTK while respecting the project's constraints. ## Constraints (never simplify away) - `lazy_static!` regex — cannot be moved inside functions even if "simpler" - `.context()` on every `?` — verbose but mandatory - Fallback to raw command — never remove even if it looks like dead code - Exit code propagation — never simplify to `Ok(())` - `#[cfg(test)] mod tests` — never remove test modules ## Simplification Patterns ### 1. Iterator chains over manual loops ```rust // ❌ Verbose let mut result = Vec::new(); for line in input.lines() { let trimmed = line.trim(); if !trimmed.is_empty() && trimmed.starts_with("error") { result.push(trimmed.to_string()); } } // ✅ Idiomatic let result: Vec = input.lines() .map(|l| l.trim()) .filter(|l| !l.is_empty() && l.starts_with("error")) .map(str::to_string) .collect(); ``` ### 2. String building ```rust // ❌ Verbose push loop let mut out = String::new(); for (i, line) in lines.iter().enumerate() { out.push_str(line); if i < lines.len() - 1 { out.push('\n'); } } // ✅ join let out = lines.join("\n"); ``` ### 3. Option/Result chaining ```rust // ❌ Nested match let result = match maybe_value { Some(v) => match transform(v) { Ok(r) => r, Err(_) => default, }, None => default, }; // ✅ Chained let result = maybe_value .and_then(|v| transform(v).ok()) .unwrap_or(default); ``` ### 4. Struct destructuring ```rust // ❌ Repeated field access fn process(args: &MyArgs) -> String { format!("{} {}", args.command, args.subcommand) } // ✅ Destructure fn process(&MyArgs { ref command, ref subcommand, .. }: &MyArgs) -> String { format!("{} {}", command, subcommand) } ``` ### 5. Early returns over nesting ```rust // ❌ Deeply nested fn filter(input: &str) -> Option { if !input.is_empty() { if let Some(line) = input.lines().next() { if line.starts_with("error") { return Some(line.to_string()); } } } None } // ✅ Early return fn filter(input: &str) -> Option { if input.is_empty() { return None; } let line = input.lines().next()?; if !line.starts_with("error") { return None; } Some(line.to_string()) } ``` ### 6. Avoid redundant clones ```rust // ❌ Unnecessary clone fn filter_output(input: &str) -> String { let s = input.to_string(); // Pointless clone s.lines().filter(|l| !l.is_empty()).collect::>().join("\n") } // ✅ Work with &str fn filter_output(input: &str) -> String { input.lines().filter(|l| !l.is_empty()).collect::>().join("\n") } ``` ### 7. Use `if let` for single-variant match ```rust // ❌ Full match for one variant match output { Ok(s) => process(&s), Err(_) => {}, } // ✅ if let (but still handle errors in RTK — don't silently drop) if let Ok(s) = output { process(&s); } // Note: in RTK filters, always handle Err with eprintln! + fallback ``` ## RTK-Specific Checks Run these after simplification: ```bash # Verify no regressions cargo fmt --all && cargo clippy --all-targets && cargo test # Verify no new regex in functions grep -n "Regex::new" src/.rs # All should be inside lazy_static! blocks # Verify no new unwrap in production grep -n "\.unwrap()" src/.rs # Should only appear inside #[cfg(test)] blocks ``` ## What NOT to Simplify - `lazy_static! { static ref RE: Regex = Regex::new(...).unwrap(); }` — the `.unwrap()` here is acceptable, it's init-time - `.context("description")?` chains — verbose but required - The fallback match arm `Err(e) => { eprintln!(...); raw_output }` — looks redundant but is the safety net - `std::process::exit(code)` at end of run() — looks like it could be `Ok(())`but it isn't

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