BEM true-way for Haml

gistfile1.haml

/views/blocks/header.haml
- b 'header', attrs: { title: "Header title" } do |b|
  - e 'title', tag: 'h1', content: 'Title example'
  - e 'subtitle', tag: 'h3', content: 'Subtitle here'



/views/index.haml
= b 'header'

/ Result
.b-header{title: "Header title"}
  %h1.b-header__title Title example
  %h3.b-header__subtitle Subtitle here



/views/test.haml
= b 'header'
  = e 'title' do
    = 'test'

/Result
.b-header{title: "Header title", onClick: "javascript:void(0)"}
  %h1.b-header__title test
  %h3.b-header__subtitle Subtitle here