はじめに

マルチスケールシミュレーション特論の講義メモです．講義メモのインデックスはコチラ

今回の参考資料はチャート式ruby-appendix-VI(thor, rubocop)です．

チャート式 Ruby

今回は Ruby 開発周辺情報のみです．

Ruby 開発周辺情報

参照記事はコチラ

thor

thor ときいたら MARVELSTUDIO の『マイティ・ソー』をイメージしてしまう．トーアと呼ぶらしい．thor はコマンドラインツールを作る際に用いる gem で，rake と似たような立ち位置にいる．

まず

gem install thor

で thor をインストールする．

以前に hello_rudy を作成したのでそれらを流用する．講義内で環境設定を行っていたが，私は既に【Week 7】gem, ruby_thirdで済ませていたのでそのまま進めていく．

./hello_rudy/lib/hello_rudy.rb を以下のように編集する．

require "thor"
require "hello_rudy/version"

class HelloRudyCLI < Thor
  desc "hello NAME", "say hello to NAME"
  def hello(name)
    puts "Hello " + name
  end
  # class Error < StandardError; end
  # # Your code goes here...
  # puts "Hello #{ARGV[0]}."
end

HelloRudyCLI.start(ARGV)

実行しようとしてみると

> bundle exec exe/hello_rudy
bundler: failed to load command: exe/hello_rudy (exe/hello_rudy)
LoadError: cannot load such file -- thor

エラーが出力される．どうやら先ほどインストールした thor が見つからない thor だ．

これは .gemspec に追記してインストールすることで解決できる．

> emacs hello_rudy.gemspec
  spec.add_runtime_dependency('thor') を追記

> bundle update
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Using rake 12.3.3
Following files may not be writable, so sudo is needed:
  /Library/Ruby/Gems/2.6.0
  /Library/Ruby/Gems/2.6.0/bin
  /Library/Ruby/Gems/2.6.0/build_info
  /Library/Ruby/Gems/2.6.0/cache
  /Library/Ruby/Gems/2.6.0/doc
  /Library/Ruby/Gems/2.6.0/extensions
  /Library/Ruby/Gems/2.6.0/gems
  /Library/Ruby/Gems/2.6.0/specifications
Using bundler 2.1.4
Using thor 1.0.1
Using hello_rudy 0.1.0 from source at `.`

Using minitest 5.14.2
Bundle updated!

> bundle install
Using rake 12.3.3
Following files may not be writable, so sudo is needed:
  /Library/Ruby/Gems/2.6.0
  /Library/Ruby/Gems/2.6.0/bin
  /Library/Ruby/Gems/2.6.0/build_info
  /Library/Ruby/Gems/2.6.0/cache
  /Library/Ruby/Gems/2.6.0/doc
  /Library/Ruby/Gems/2.6.0/extensions
  /Library/Ruby/Gems/2.6.0/gems
  /Library/Ruby/Gems/2.6.0/specifications
Using bundler 2.1.4
Using thor 1.0.1
Using hello_rudy 0.1.0 from source at `.`

Using minitest 5.14.2
Bundle complete! 3 Gemfile dependencies, 5 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.~

それではもう一度．実行できるだろうか．

> bundle exec exe/hello_rudy
Commands:
  hello_rudy hello NAME      # say hello to NAME
  hello_rudy help [COMMAND]  # Describe available commands or one specific command

> bundle exec exe/hello_rudy hello Rudy
Hello Rudy

問題なく実行できた．久しぶりに Rudy 登場．

続いて，実行できるようにインストールしてみる．

> sudo rake install:local
hello_rudy 0.1.0 built to pkg/hello_rudy-0.1.0.gem.
hello_rudy (0.1.0) installed.

> hello_rudy hello kitty
Hello kitty

無事サンリオのキャラクター名が出力された．

rake と似たような感じだが違いをあまり感じられなかった．後で調べてみる．

rubocop

またまた洋画名っぽいやつ．thor と rubocop で闘うつもりなのだろうか．

そんなことはおいておいて，rubocop とは code formatter の一種らしい．コードが規約どおり書かれているかチェックしてくれる．

フォーマット機能以外にも長いコードやったら怒られる機能もあるらしい．ついに PC にも怒られる時代が来たのか．

とりあえず気になったので使ってみる．まずはインストール．

sudo gem install rubocop                                                                                 333ms  Mon Dec 28 18:23:59 2020
Fetching parallel-1.20.1.gem
Fetching rubocop-ast-1.3.0.gem
Fetching ast-2.4.1.gem
Fetching regexp_parser-2.0.3.gem
Fetching parser-3.0.0.0.gem
Fetching ruby-progressbar-1.10.1.gem
Fetching rubocop-1.7.0.gem
Fetching unicode-display_width-1.7.0.gem
Successfully installed parallel-1.20.1
Successfully installed ast-2.4.1
Successfully installed parser-3.0.0.0
Successfully installed regexp_parser-2.0.3
Successfully installed rubocop-ast-1.3.0
Successfully installed ruby-progressbar-1.10.1
Successfully installed unicode-display_width-1.7.0
Successfully installed rubocop-1.7.0
Parsing documentation for parallel-1.20.1
Installing ri documentation for parallel-1.20.1
Parsing documentation for ast-2.4.1
Installing ri documentation for ast-2.4.1
Parsing documentation for parser-3.0.0.0
Installing ri documentation for parser-3.0.0.0
Parsing documentation for regexp_parser-2.0.3
Installing ri documentation for regexp_parser-2.0.3
Parsing documentation for rubocop-ast-1.3.0
Installing ri documentation for rubocop-ast-1.3.0
Parsing documentation for ruby-progressbar-1.10.1
Installing ri documentation for ruby-progressbar-1.10.1
Parsing documentation for unicode-display_width-1.7.0
Installing ri documentation for unicode-display_width-1.7.0
Parsing documentation for rubocop-1.7.0
Installing ri documentation for rubocop-1.7.0
Done installing documentation for parallel, ast, parser, regexp_parser, rubocop-ast, ruby-progressbar, unicode-display_width, rubocop after 22 seconds
8 gems installed

めっちゃ parser 入れられたやん．なんだか嫌な予感．

とりあえず実行してみた．

/SpaceAroundOperators: Surrounding space missing for operator ==.
  return 0 if n==0
               ^^
fibonacci_copy.rb:5:3: C: [Corrected] Layout/EmptyLineAfterGuardClause: Add empty line after guard clause.
  return 1 if n==1
  ^^^^^^^^^^^^^^^^
fibonacci_copy.rb:5:16: C: [Corrected] Layout/SpaceAroundOperators: Surrounding space missing for operator ==.
  return 1 if n==1
               ^^
fibonacci_copy.rb:6:3: C: [Corrected] Style/RedundantReturn: Redundant return detected.
  return fib(n-1) + fib(n-2)
  ^^^^^^
fibonacci_copy.rb:6:15: C: [Corrected] Layout/SpaceAroundOperators: Surrounding space missing for operator -.
  return fib(n-1) + fib(n-2)
              ^
fibonacci_copy.rb:6:26: C: [Corrected] Layout/SpaceAroundOperators: Surrounding space missing for operator -.
  return fib(n-1) + fib(n-2)
                         ^
fibonacci_copy.rb:9:4: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
   ^
fibonacci_copy.rb:9:7: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
      ^
fibonacci_copy.rb:9:10: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
         ^
fibonacci_copy.rb:9:13: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
            ^
fibonacci_copy.rb:9:16: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
               ^
fibonacci_copy.rb:9:19: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                  ^
fibonacci_copy.rb:9:22: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                     ^
fibonacci_copy.rb:9:25: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                        ^
fibonacci_copy.rb:9:28: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                           ^
fibonacci_copy.rb:9:31: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                              ^
fibonacci_copy.rb:9:34: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                                 ^
fibonacci_copy.rb:9:37: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                                    ^
fibonacci_copy.rb:9:40: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                                       ^
fibonacci_copy.rb:9:43: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                                          ^
fibonacci_copy.rb:9:46: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                                             ^
fibonacci_copy.rb:9:50: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                                                 ^
fibonacci_copy.rb:9:53: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
[[0,0],[1,1],[2,1],[3,2],[4,3],[5,5],[6,8],[7,13],[8,21]].each do |index, expected|
                                                    ^
fibonacci_copy.rb:10:1: C: [Corrected] Layout/IndentationWidth: Use 2 (not 4) spaces for indentation.
    puts assert_equal(expected,fib(index))
^^^^
fibonacci_copy.rb:10:31: C: [Corrected] Layout/SpaceAfterComma: Space missing after comma.
    puts assert_equal(expected,fib(index))
                              ^

1 file inspected, 29 offenses detected, 26 offenses corrected, 2 more offenses can be corrected with `rubocop -A`~

嫌な予感的中．すごい怒られた．もう一生使わんとこ．

まとめ

講義の記事はこれにて終了．ruby は rails でアプリケーション作るためだけのものやと思っていたけど，どうやら違うみたい．

はじめの環境構築は大変だったけどTDDやオブジェクト指向，Rake，それとemacs，org，github，qiita 色々学べたのでなんだかんだ楽しかった．コロナ禍のオンライン授業お疲れ様でした．

source ~/grad_members_20f/members/e79a93e5b7b1/posts/class/c12_20201216.org