Vim and Ruby

Rails Developers Meetup 2017(飛び込みLT)

Transcript

1. Vim and Ruby
   Rails Developers Meetup 2017(LT)
   Dec. 9, 2017
   

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2. $ cat /path/to/pocke
   ● Masataka Kuwabara (Pocke)
   ● SideCI
   ● RuboCop's core developer
   ● RuboCop-JP Organizer ← New
   

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4. Vim and Ruby
   

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5. Q. attendees.use?(Vim)
   

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6. OK, everyone uses Vim!
   

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7. Vim Plugins
   ● We can get more powerful Vim with plugins.
   ○ Plugin examples: vim-rails (I don't use it), Denite.nvim,
   NeoSnippet, …
   ● Vim plug-ins are written in Vim script.
   ○ And, many "dark-powered" Vim plug-ins are written in
   Python.
   

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8. Vim script and Python...
   

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9. You can write Vim plugins
   in Ruby
   

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10. Vim Ruby
    ● We can write Vim plugins in native language.
    ● We can use gems e.g.) ActiveSupport
    ● We can use Ruby's powerful standard
    libraries
    ○ https://docs.ruby-lang.org/ja/latest/class/String.html
    ● See more information → :help ruby
    ○ http://vim-jp.org/vimdoc-ja/if_ruby.html
    

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11. How to write ruby code
    

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12. Inline Ruby script
    " In .vimrc
    ruby << RUBY
    def hello(name)
    puts "Hello, #{name}!"
    end
    hello("pocke")
    RUBY
    ruby hello('pocke') "It prints Hello, pocke!
    

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13. Inline Ruby script
    " In .vimrc
    ruby << RUBY
    def hello(name)
    puts "Hello, #{name}!"
    end
    hello("pocke")
    RUBY
    ruby hello('pocke') "It prints Hello, pocke!
    

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14. Load a ruby file from Vim script
    $ tree
    autoload/
    ├── foo.vim
    └── foo.vim.rb
    

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15. Load a ruby file from Vim script
    " In foo.vim, it loads foo.vim.rb
    let s:self_path = expand("")
    execute 'ruby require "' .
    \ s:self_path . '.rb"'
    

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16. How to communicate with
    Vim and Ruby
    

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17. Vim → Ruby
    # In a ruby script
    source =
    Vim.evaluate("getbufline('.', 1, '$')")
    .join("\n")
    puts source # editing source code is printed
    

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18. Ruby → Vim(I think it is a workaround...)
    # In Ruby script, serialize the result,
    # and assign Vim script's variable
    Vim.command "let s:result = #{res.to_json}"
    " In Vim script
    echo s:result
    

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19. Vim plugins written in Ruby
    In the real world
    

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20. github.com/pocke/iro.vim
    

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21. Iro.vim
    ● A new syntax highlighter for Ruby, YAML, and
    Python (Python support is experimental).
    ● Use parser to highlight instead of regular
    expression.
    ○ Ripper, Psych, ...
    ● It highlights perfectly.
    

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22. Iro.vim
    ● See my slide also: "The new syntax
    highlighter for vim." in VimConf 2017
    ○ https://speakerdeck.com/pocke/the-new-syntax-highl
    ighter-for-vim
    

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23. github.com/pocke/
    yaml-path.vim
    

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24. YAML-Path.vim
    ● Display a path of YAML.
    ● It uses Psych to parse a YAML code.
    

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26. Conclusion
    

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27. Conclusion
    ● We can write Vim plugins in Ruby
    ● You can find examples, iro.vim and
    yaml-path.vim.
    ● Maybe it is helpful for Rails.
    Thank you for listening!
    Follow me Twitter: @p_ck_
    GitHub: @pocke
    

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