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elixir-clause-grouping

Name: Elixir Clause Grouping
Author: blockscout

// Use when refactoring Elixir multi-clause functions, extracting helper functions, or fixing Credo readability warnings caused by placing `defp` helpers between clauses of the same function. Keeps function clauses contiguous and moves helpers below the full clause group.

Manus에서 실행

$ git log --oneline --stat

stars:4,552

forks:3,076

updated:2026년 4월 9일 12:45

SKILL.md

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name	elixir-clause-grouping
description	Use when refactoring Elixir multi-clause functions, extracting helper functions, or fixing Credo readability warnings caused by placing `defp` helpers between clauses of the same function. Keeps function clauses contiguous and moves helpers below the full clause group.

Overview

In Elixir modules, all clauses of the same function should stay together. Inserting a defp helper between clauses of a def or defp makes the function harder to read and can trigger Credo readability warnings. When shared logic needs to be extracted, keep the original clause group contiguous and place the helper after the full group.

When to Use

When refactoring a multi-clause def or defp
When extracting duplicated logic from multiple function clauses
When addressing Credo warnings about clause grouping or readability
When editing controller, view, or context modules with several clauses of the same function
During review when a helper was added in the middle of another function's clauses

Core Rule

Keep all clauses of the same function contiguous
Do not place defp helpers between clauses of another function
Extract shared logic into a helper placed after the full clause group

Anti-Pattern

def decoded_input_data(%Transaction{to_address: nil}, _, _, _, _), do: {:error, :no_to_address}

defp decode_input_data_with_fallback(data, abi, input, hash, skip_sig_provider?, options, methods_map, abi_map) do
  ...
end

def decoded_input_data(%Transaction{to_address: %NotLoaded{}}, _, _, _, _), do: {:error, :contract_not_verified, []}

This splits the decoded_input_data/5 clause group and makes the function harder to scan.

Preferred Pattern

def decoded_input_data(%Transaction{to_address: nil}, _, _, _, _), do: {:error, :no_to_address}

def decoded_input_data(%Transaction{to_address: %NotLoaded{}}, _, _, _, _), do: {:error, :contract_not_verified, []}

def decoded_input_data(%Transaction{to_address: %{smart_contract: smart_contract}} = transaction, skip_sig_provider?, options, methods_map, abi_map) do
  ...
end

defp decode_input_data_with_fallback(data, abi, input, hash, skip_sig_provider?, options, methods_map, abi_map) do
  ...
end

Refactoring Checklist

Identify every clause of the function being edited.
Keep those clauses adjacent to each other.
Extract shared logic only after the full clause group.
Re-check that no unrelated def or defp appears inside the group.
Run formatting after the refactor.

Notes

This applies to both public and private multi-clause functions.
If a helper is only used by one clause group, place it immediately after that group.
Preserving clause grouping is preferred even when the extracted helper is small.

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package.json

"author": "blockscout"

"repository": "blockscout/blockscout"

GitHub 저장소 열기 Creator 저장소 보기

$ install --global

$ download --local

Manus에서 실행

$ useful --forSOC

소프트웨어 개발자컴퓨터 및 수학직15-1252L4

name	elixir-clause-grouping
description	Use when refactoring Elixir multi-clause functions, extracting helper functions, or fixing Credo readability warnings caused by placing `defp` helpers between clauses of the same function. Keeps function clauses contiguous and moves helpers below the full clause group.

Overview

When to Use

When refactoring a multi-clause def or defp
When extracting duplicated logic from multiple function clauses
When addressing Credo warnings about clause grouping or readability
When editing controller, view, or context modules with several clauses of the same function
During review when a helper was added in the middle of another function's clauses

Core Rule

Keep all clauses of the same function contiguous
Do not place defp helpers between clauses of another function
Extract shared logic into a helper placed after the full clause group

Anti-Pattern

def decoded_input_data(%Transaction{to_address: nil}, _, _, _, _), do: {:error, :no_to_address}

defp decode_input_data_with_fallback(data, abi, input, hash, skip_sig_provider?, options, methods_map, abi_map) do
  ...
end

def decoded_input_data(%Transaction{to_address: %NotLoaded{}}, _, _, _, _), do: {:error, :contract_not_verified, []}

This splits the decoded_input_data/5 clause group and makes the function harder to scan.

Preferred Pattern

def decoded_input_data(%Transaction{to_address: nil}, _, _, _, _), do: {:error, :no_to_address}

def decoded_input_data(%Transaction{to_address: %NotLoaded{}}, _, _, _, _), do: {:error, :contract_not_verified, []}

def decoded_input_data(%Transaction{to_address: %{smart_contract: smart_contract}} = transaction, skip_sig_provider?, options, methods_map, abi_map) do
  ...
end

defp decode_input_data_with_fallback(data, abi, input, hash, skip_sig_provider?, options, methods_map, abi_map) do
  ...
end

Refactoring Checklist

Identify every clause of the function being edited.
Keep those clauses adjacent to each other.
Extract shared logic only after the full clause group.
Re-check that no unrelated def or defp appears inside the group.
Run formatting after the refactor.

Notes

This applies to both public and private multi-clause functions.
If a helper is only used by one clause group, place it immediately after that group.
Preserving clause grouping is preferred even when the extracted helper is small.

elixir-clause-grouping

Overview

When to Use

Core Rule

Anti-Pattern

Preferred Pattern

Refactoring Checklist

Notes

이 저장소의 다른 Skills

이 저장소의 다른 Skills

Overview

When to Use

Core Rule

Anti-Pattern

Preferred Pattern

Refactoring Checklist

Notes