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Vim and Ruby
Rails Developers Meetup 2017(LT)
Dec. 9, 2017
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$ cat /path/to/pocke
● Masataka Kuwabara (Pocke)
● SideCI
● RuboCop's core developer
● RuboCop-JP Organizer ← New
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Vim and Ruby
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Q. attendees.use?(Vim)
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OK, everyone uses Vim!
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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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Vim script and Python...
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You can write Vim plugins
in Ruby
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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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How to write ruby code
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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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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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Load a ruby file from Vim script
$ tree
autoload/
├── foo.vim
└── foo.vim.rb
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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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How to communicate with
Vim and Ruby
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Vim → Ruby
# In a ruby script
source =
Vim.evaluate("getbufline('.', 1, '$')")
.join("\n")
puts source # editing source code is printed
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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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Vim plugins written in Ruby
In the real world
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github.com/pocke/iro.vim
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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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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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github.com/pocke/
yaml-path.vim
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YAML-Path.vim
● Display a path of YAML.
● It uses Psych to parse a YAML code.
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Conclusion
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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