# Complexity Review Report

**Branch**: feat/rskim-search-foundation -> main
**Date**: 2026-05-10

## Issues in Your Changes (BLOCKING)

_No blocking complexity issues found._

## Issues in Code You Touched (Should Fix)

_No should-fix complexity issues found._

## Pre-existing Issues (Not Blocking)

_No critical pre-existing complexity issues in reviewed files._

## Suggestions (Lower Confidence)

- **SearchQuery has 6 optional fields but no builder pattern** - `crates/rskim-search/src/types.rs:106` (Confidence: 65%) -- SearchQuery currently has 6 fields (lang, ast_pattern, temporal_flags, limit, offset) all individually settable. If this grows further (e.g., sort order, field filters), consider a builder pattern or method chaining to keep construction ergonomic and avoid wide struct literals in callers.

- **scan_extended_headers if-else chain has 7 branches** - `crates/rskim/src/cmd/git/diff/parse.rs:43-67` (Confidence: 62%) -- The `scan_extended_headers` function uses a linear if-else chain with 7 arms to detect file change types from extended header lines. Cyclomatic complexity is at the warning threshold. A lookup table or dispatch approach could improve maintainability if more header types are added, though the current form is readable at this size.

## Summary

| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 0 | 0 | 0 |
| Should Fix | 0 | 0 | 0 | 0 |
| Pre-existing | 0 | 0 | 0 | 0 |

**Complexity Score**: 9/10
**Recommendation**: APPROVED

### Rationale

This PR introduces a clean, minimal foundation crate (`rskim-search`) consisting of pure types, traits, and error handling. The new code is exemplary from a complexity perspective:

**rskim-search types (255 LOC, new)**: All types are flat data structures with no behavioral complexity. The SearchField enum has a simple exhaustive `name()` method. SearchQuery constructor is a single-expression function. Error types use thiserror derive with no manual control flow. Every function is well under the 30-line threshold. No nesting beyond 1 level. Zero cyclomatic complexity concerns.

**rskim-search lib.rs (17 LOC, new)**: A minimal re-export module. Switched from glob re-export (`pub use types::*`) to explicit named re-exports -- reduces cognitive load on consumers and eliminates implicit public surface area.

**cmd/search.rs (98 LOC, new)**: A stub CLI entry point with a single if-branch for help detection. Cyclomatic complexity is 2. Tests are simple and behavior-focused.

**Bulk changes (100+ files)**: The remaining ~100 files are mechanical Rust edition 2024 formatting changes (import alphabetization, let-else brace placement). These changes are complexity-neutral -- they reformat existing code without altering control flow, nesting depth, or function lengths. The `let ... && let ...` brace placement changes (e.g., in `install.rs:415-428`, `compound.rs:279-294`) actually improve readability by aligning the brace with the `if`, conforming to the standard Rust 2024 formatting.

No function in the changed code exceeds 50 lines. No nesting exceeds 3 levels. No function has more than 5 parameters. All new code is explainable in under 2 minutes.
