Module: ActionView::Helpers::TextHelper

Defined in:
lib/auto_link_email_addresses.rb

Instance Method Summary collapse

Instance Method Details

Turns all email addresses into clickable links. If a block is given, each email is yielded and the result is used as the link text. Example:

auto_link_email_addresses(post.body) do |text|
  truncate(text, 15)
end



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# File 'lib/auto_link_email_addresses.rb', line 9

def auto_link_email_addresses(content)
  re = %r{
          (<\w+[^\<\>]*?\>|[\s[:punct:]]|mailto:|^) # leading text
          (
            [\w\.\!\#\$\%\-\+\.]+                   # username
            \@
            [-\w]+                                  # subdomain or domain
            (?:\.[-\w]+)+                           # remaining subdomains or domain
          ) 
          ([[:punct:]]|\s|\<|$)                     # trailing text
         }x
  
  content.gsub(re) do |all|
    # this seems incredibly stupid, but $1, $2, $3 weren't being set
    re.match(all)
    
    a, b, c = $1, $2, $3
    
    if a =~ /\<a\s|[='"]$/i
      all
    elsif a =~ /mailto:/i
      url_src = b
      
      url = ''
      url_src.length.times do |i|
        url << (i % 2 == 0 ? sprintf("%%%x", url_src[i].ord) : url_src[i])
      end
      
      "#{a}#{url}#{c}"
    else
      url_src = b
      text_src = b
      text_src = yield(text_src) if block_given?
      
      unless url_src && text_src
        all
      else
        url = ''
        text = ''
        url_src.length.times do |i|
          url << (i % 2 == 0 ? sprintf("%%%x", url_src[i].ord) : url_src[i])
        end
        text_src.length.times do |i|
          text << (i % 4 == 0 ? '<span>' << text_src[i] << '</span>' : text_src[i])
        end
        
        "#{a}<a href=\"mailto:#{url}\">#{text}</a>#{c}"
      end
    end
  end.html_safe
end