# Complexity Review Report

**Branch**: feat/188-cli-search-integration -> main
**Date**: 2026-05-19
**Scope**: Incremental (459d0af...HEAD, 2 commits)

## Issues in Your Changes (BLOCKING)

(none)

## Issues in Code You Touched (Should Fix)

(none)

## Pre-existing Issues (Not Blocking)

(none)

## Suggestions (Lower Confidence)

(none)

## Summary

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

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

## Analysis Notes

This incremental diff (2 commits) is a textbook complexity reduction. Every change moves the codebase toward lower cyclomatic complexity and better maintainability. Specific observations:

### Positive Changes

1. **SearchAction enum replaces boolean flag cascade** (`mod.rs:86-100`). The old code used six `bool` fields (`build`, `rebuild`, `update`, `stats`, `install_hooks`, `remove_hooks`) and dispatched via a waterfall of `if flags.X` checks. The new code encodes the mutually-exclusive action as a single `SearchAction` enum and dispatches via a `match` expression. This eliminates an entire class of invalid states (e.g. `build=true, rebuild=true` simultaneously) and reduces the cyclomatic complexity of `run()` from ~8 to ~2 (a single match with 8 arms vs. 6 sequential if-blocks plus a fallthrough).

2. **parse_flags returns Result** (`mod.rs:120`). The old code silently swallowed invalid `--limit` values and missing `--root` arguments. The new code returns `anyhow::Result<Flags>`, pushing errors to the caller. This is structurally simpler because callers no longer need to defensively handle silently-defaulted values.

3. **check_staleness 4-cell match table** (`staleness.rs:210-230`). The old code had a cascade of early returns with subtle interaction between `None`/`Some` on stored vs. current HEAD. The new code uses a single `match (stored.as_deref(), current.as_deref())` with 4 explicit arms, each documented inline. All 4 combinations are visible at once. The staleness truth table in the doc comment (lines 176-181) further aids comprehension.

4. **BTreeMap replaces HashMap + sort** (`manifest.rs:109-112, 270-275`). Eliminates two separate `sort_unstable()` calls in `sorted_paths()` and `save()`. The data structure itself now guarantees the ordering invariant, reducing the conceptual burden on callers.

5. **Snippet window avoids full-file Vec allocation** (`snippet.rs:79-96`). The old code collected all lines into a `Vec<&str>` then indexed into it. The new code uses `.skip(n).take(m)` on the iterator, reducing peak memory and removing an intermediate allocation. The function length stayed the same but the conceptual complexity dropped (no indexing arithmetic, no `as usize` cast on the index variable).

6. **write_hook_atomic uses NamedTempFile** (`hooks.rs:182-205`). Replaced a manual `write` + `set_permissions` + `rename` + `remove_file`-on-error pattern (4 error recovery branches) with `NamedTempFile::new_in` + `persist` (auto-cleanup on drop). The function dropped from 17 lines with 3 manual error-recovery branches to 12 lines with zero manual cleanup.

7. **Display for StalenessCheck** (`staleness.rs:36-50`). Replaces the `{:?}` Debug formatting used in `--stats` output with a human-readable `Display` impl. This is a minor readability improvement -- the match is straightforward with 4 arms.

All functions touched in this diff remain well under the 30-line warning threshold. Nesting depth never exceeds 2 in the changed code. No new magic values were introduced. The `parse_flags` function at 69 lines is the longest function modified but its structure is a flat `match` with no nesting beyond level 1, so cognitive complexity remains low.
