Strip Whitespace from Heredocs in Ruby/Rails


UPDATE!

Simple way - it's use:


class Template

  def self.base

    <<~TEXT

      Lorem Ipsum is simply dummy

      Lorem Ipsum is simply dummy

    TEXT

  end

end



> Template.base

=> "Lorem Ipsum is simply dummy\nLorem Ipsum is simply dummy\n"

I forgot about <<~, and that's why I got this TIL bike.


You use heredoc in Ruby/Rails app?

Then you're familiar with the problem..


class Template

  def self.base

    <<-TEXT

      Lorem Ipsum is simply dummy

      Lorem Ipsum is simply dummy

      Lorem Ipsum is simply dummy

    TEXT

  end

end



> Template.base

=> "      Lorem Ipsum is simply dummy\n      Lorem Ipsum is simply dummy\n      Lorem Ipsum is simply dummy\n"

hmm...

I don't want to have so many gaps in the text.

Maybe use them:


class Template

  def self.base

    <<-TEXT

Lorem Ipsum is simply dummy

Lorem Ipsum is simply dummy

    TEXT

  end

end



> Template.base

=> "Lorem Ipsum is simply dummy\nLorem Ipsum is simply dummy\n"

It's good, but the code looks like 💩.

This problem can be solved by using activesupport #strip_heredoc:


class Template

  def self.base

    <<-TEXT.strip_heredoc

      Lorem Ipsum is simply dummy

      Lorem Ipsum is simply dummy

    TEXT

  end

end



> Template.base

=> "Lorem Ipsum is simply dummy\nLorem Ipsum is simply dummy\n"

If you don't have active_support, use refine String with #strip_heredoc which will give similar result:


module Utils 

  refine String do 

    def strip_heredoc

      gsub(/^#{scan(/^[ \t]*(?=\S)/).min}/, "".freeze)

    end

  end

end



class Template

  using Utils

  def self.base

    <<-TEXT.strip_heredoc

      Lorem Ipsum is simply dummy

      Lorem Ipsum is simply dummy

    TEXT

  end

end



> Template.base 

=> "Lorem Ipsum is simply dummy\nLorem Ipsum is simply dummy\n"


Andrey
Morozov

Backend Developer at JetRockets

Explore more of JetRockets