lib/logging/utils.rb in logging-0.9.0 vs lib/logging/utils.rb in logging-0.9.1

@@ -38,6 +38,35 @@
     when :Symbol;  String(val).intern
     else val end
   end
 end
 
+class String
+
+  # call-seq:
+  #    reduce( width, ellipses = '...' )    #=> string
+  #
+  # Reduce the size of the current string to the given _width_ by remove
+  # characters from the middle of ths tring and replacing them with
+  # _ellipses_. If the _width_ is greater than the length of the string, the
+  # string is returned unchanged. If the _width_ is less than the length of
+  # the _ellipses_, then the _ellipses_ are returned.
+  #
+  def reduce( width, ellipses = '...')
+    raise ArgumentError, "width cannot be negative: #{width}" if width < 0
+
+    return self if length <= width
+
+    remove = length - width + ellipses.length
+    return ellipses.dup if remove >= length
+
+    left_end = (length + 1 - remove) / 2
+    right_start = left_end + remove
+
+    left = self[0,left_end]
+    right = self[right_start,length-right_start]
+
+    left << ellipses << right
+  end
+end
+
 # EOF