# Complexity Review Report

**Branch**: feat-rskim-search-foundation -> main
**Date**: 2026-05-10T15:00

## Issues in Your Changes (BLOCKING)

_No blocking complexity issues found._

All new code in `rskim-search` exhibits excellent complexity characteristics:

- **types.rs** (337 lines): Well within the 400-line file limit. Contains only flat data structures, a single enum, three trait definitions, and a small error enum. No function exceeds 10 lines. Cyclomatic complexity across the entire file is negligible (only `SearchField::name()` has an 8-arm match, which is the canonical Rust pattern for enum dispatch).
- **lib.rs** (39 lines): Module re-export and a single compile-time API surface test. Zero complexity.
- **search.rs** (66 lines): CLI stub with a single conditional branch (`args.is_empty() || --help`). Two functions, both under 15 lines. Cyclomatic complexity = 2.

### CRITICAL
(none)

### HIGH
(none)

## Issues in Code You Touched (Should Fix)

_No should-fix complexity issues found._

The clippy `collapsible_if` fixes across 20+ files in the `rskim` crate are uniformly **complexity reductions** -- they merge nested `if let` chains into edition 2024 `if-let && let` syntax, which:
- Reduces nesting depth by 1 level in every affected location
- Preserves identical control flow semantics
- Is an automated, mechanical transformation (cargo clippy --fix)

Notable examples of complexity improvement:

| File | Before (nesting) | After (nesting) |
|------|-------------------|------------------|
| `render.rs:215-220` | 3 levels (`if let && if insert && if let Some`) | 2 levels (single `if let && && let Some`) |
| `cargo.rs:287-294` | 2 levels (`if in_stdout_block { if let Some...`) | 1 level (`if in_stdout_block && let Some...`) |
| `cargo.rs:434-441` | 3 levels (`if find [ { if find ] { if strip_suffix s...`) | 2 levels (chained let-chain) |

These changes strictly reduce McCabe/cyclomatic complexity without changing behavior.

## Pre-existing Issues (Not Blocking)

### MEDIUM

**Deep nesting in `classify_lines`** - `crates/rskim/src/cmd/git/fetch.rs:150-184`
**Confidence**: 82%
- Problem: `classify_lines` has multiple 3-level nested `if let / if let / if let` blocks (lines 151-157, 163-166, 171-174, 179-182) that were not addressed by the edition 2024 clippy fixes. These remain at nesting depth 3 within the `for` loop body.
- The PR's clippy pass only collapsed `collapsible_if` warnings -- these particular blocks have interleaved `continue` statements that prevent collapsing, so they remain unchanged.
- Fix: Not blocking. Could be addressed in a future refactor by extracting each category (new branch, new tag, deleted, forced, updated) into dedicated classification helper functions.

## Suggestions (Lower Confidence)

- **`SearchQuery` has 6 fields, all public, no builder** - `crates/rskim-search/src/types.rs:99-112` (Confidence: 65%) -- As the query gains more filter options, a builder pattern would prevent the constructor from growing unwieldy. Currently fine with `SearchQuery::new()` + field mutation, but worth watching.

- **`SearchResult` has 6 fields with heterogeneous types** - `crates/rskim-search/src/types.rs:137-150` (Confidence: 62%) -- The mix of `f64`, `Range<usize>`, `Vec<Range<usize>>`, `Option<String>`, etc. is reasonable for a result struct but could benefit from a display/formatting helper as usage grows, to avoid scattered formatting logic in consumers.

## Summary
| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 0 | 0 | 0 |
| Should Fix | 0 | 0 | 0 | 0 |
| Pre-existing | 0 | 0 | 1 | 0 |

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

The new `rskim-search` crate is exemplary in its simplicity: pure types, thin traits, flat module structure, no control flow complexity. The `search.rs` CLI stub is minimal and well-bounded. The edition 2024 `collapsible_if` migration across the workspace is a net complexity reduction (52 sites flattened by 1 nesting level each). No complexity concerns warrant blocking or requesting changes.
