> For the complete documentation index, see [llms.txt](https://kashiwara.gitbook.io/rubydesurufurusukuratchibe/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kashiwara.gitbook.io/rubydesurufurusukuratchibe/di-san-zhang-jing-de-jie-xi/rubocopnoinsutru.md).

# RuboCopのインストール

静的解析ツール(rubocop)をプロジェクトに導入してコードをキレイに保つようにしましょう。

## Gemfileの追加

以下のGemfileを作成し、codeフォルダ直下に配置してください。

```
# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }

gem 'rubocop', '~> 1.22', require: false
```

Gemfileを追加した後のフォルダ構造は、以下のようになります。

```
ruby-practice/
　├ docker-compose.yml
　├ code/
　│　└ Dockerfile
　│　└ main.rb
　│　└ Gemfile
　│　└ tic_tac_toe/
　│　   └ tic_tac_toe.rb
　│　└ test/
　│　   └ tic_tac_toe_test.rb
```

## build時にbundle installを追加

docker-compose build時に、rubocopが自動でインストールされるようにします。

Dockerファイルに以下の修正を加えてください。

```
FROM ruby:3.1
RUN gem update --system
RUN gem install bundler
COPY Gemfile ./Gemfile
RUN bundle install
WORKDIR /code
```

## rubocopがインストール出来た事を確認する

環境構築を実施した時と同じようにbuildとupを実行します。

```
docker-compose build
docker-compose up -d
```

コンテナの中に入り

```
docker exec -ti code /bin/bash
```

以下のコマンドを実行します。

```
gem list | grep "rubocop"
```

以下のような出力になればインストールに成功しています。

```
rubocop (1.22.3)
rubocop-ast (1.12.0)
```


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