deduplicate

Included with Lifetime

$97 forever

Find and refactor duplicate code. Use this skill when the user wants to find near-duplicate code, check for copy-paste redundancy, or DRY up a codebase — optionally scoped to changed files.

Writing & Docs

What this skill does



# Deduplicate

Find near-duplicates with tree-sitter semantic similarity, then refactor to remove redundancy.

{% include "_partials/delegate-to-subagent" %}

## Process

1. **Scope:**
   - **Changed files** (default) — `{"op": "get changes"}` from `git`
   - **Specific files** — user-named
   - **Whole codebase** — broad sweep

2. **Check tree-sitter index**: `{"op": "get status"}` — must be ready before detection.

3. **Detect**: `treesitter` `op: "find duplicates"` on scoped files. For each cluster note: what's duplicated, severity, refactor opportunity (extract function, module, trait).

4. **Refactor** (if requested, not just analysis):
   - Extract shared logic
   - Replace duplicates with calls
   - Run tests after each extraction
   - Follow TDD — if no test covers it, write one

5. **Track on kanban** for clusters needing human decision:

   ```json
   {"op": "init board"}
   {"op": "add tag", "id": "duplicate", "name": "Duplicate Code", "color": "ff8800", "description": "Near-duplicate code needing refactoring"}
   {"op": "add task", "title": "<concise description>", "description": "<files and lines>\n\n<what's duplicated>\n\n<suggested refactoring>", "tags": ["duplicate"]}
   ```

6. **Summarize**: clusters by severity, refactors done, kanban tasks created, next-step recommendation.

## Rules

- Report only actionable duplication. Ignore test fixtures, generated code, trait-impl boilerplate, single-line matches.
- Prefer the smallest extraction; don't over-abstract.
- Note dependency implications when duplicates cross crates/packages.
- Kanban is the single source of truth — no TodoWrite/TaskCreate.

Files: 1

Size: 2.1 KB

Complexity: 11/100

Category: Writing & Docs

Source: https://github.com/swissarmyhammer/swissarmyhammer/tree/main/builtin/skills/deduplicate

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