Added truncate_words method to activesupport strings

1 files changed, 21 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/string/filters.rb b/activesupport/lib/active_support/core_ext/string/filters.rb
index 49c0df6026..2029909486 100644
--- a/activesupport/lib/active_support/core_ext/string/filters.rb
+++ b/activesupport/lib/active_support/core_ext/string/filters.rb
@@ -62,4 +62,25 @@ class String
 
     "#{self[0, stop]}#{omission}"
   end
+
+  # Truncates a given +text+ after a given number of words<tt>words_count</tt>:
+  #
+  #   'Once upon a time in a world far far away'.truncate_words(4)
+  #   # => "Once upon a time..."
+  #
+  # Pass a string or regexp <tt>:separator</tt> to specify a different separator of words:
+  #
+  #   'Once<br>upon<br>a<br>time<br>in<br>a<br>world'.truncate_words(5, separator: '<br>')
+  #   # => "Once<br>upon<br>a<br>time<br>in..."
+  #
+  # The last characters will be replaced with the <tt>:omission</tt> string (defaults to "..."):
+  #
+  #   'And they found that many people were sleeping better.'.truncate_words(5, omission: '... (continued)')
+  #   # => "And they found that many... (continued)"
+  def truncate_words(words_count, options = {})
+    sep = options[:separator] || /\s+/
+    sep = Regexp.escape(sep.to_s) unless Regexp === sep
+    return dup unless self =~ /^((?:.+?#{sep}){#{words_count - 1}}.+?)#{sep}.*/
+    $1 + (options[:omission] || '...')
+  end
 end