module ActionView::Helpers::TextHelper

# => "Once upon a time in a wo...Continue"
truncate("Once upon a time in a world far far away") { link_to "Continue", "#" }

# => "

Once upon a time in a wo..."
truncate("

Once upon a time in a world far far away

", escape: false)

# => "<p>Once upon a time in a wo..."
truncate("

Once upon a time in a world far far away

")

# => "And they f... (continued)"
truncate("And they found that many people were sleeping better.", length: 25, omission: '... (continued)')

# => "Once upon a..."
truncate("Once upon a time in a world far far away", length: 17, separator: ' ')

# => "Once upon a ti..."
truncate("Once upon a time in a world far far away", length: 17)

# => "Once upon a time in a world..."
truncate("Once upon a time in a world far far away")

may produce invalid HTML (such as unbalanced or incomplete tags).
+false+. Care should be taken if +text+ contains HTML tags or entities, because truncation
The result is marked as HTML-safe, but it is escaped by default, unless :escape is

Pass a block if you want to show extra content when the text is truncated.

Pass a :separator to truncate +text+ at a natural break.

for a total length not exceeding :length.
(defaults to 30). The last characters will be replaced with the :omission (defaults to "...")
Truncates a given +text+ after a given :length if +text+ is longer than :length

def truncate(text, options = {}, &block)
  if text
    length  = options.fetch(:length, 30)
    content = text.truncate(length, options)
    content = options[:escape] == false ? content.html_safe : ERB::Util.html_escape(content)
    content << capture(&block) if block_given? && text.length > length
    content
  end
end