consolidate a sequence of concurrent numbers with hyphens

gistfile1.rb

# take list of 1,2,3,5,6,7,10 and turn into 1-3,5-7,10
def self.consolidate_pdsh_values(vals)
  # vals is an array 
  # Examples:
  # 005,006,007,008,009,010,011,012         => 005-0012
  # 123,4,5,6,7,8,9,10,11,12,1234,1235,1236 => 4-12,123,1234-1236
  sorted_vals = vals.sort{|a,b| a.to_i <=> b.to_i}
  skipped_vals = sorted_vals.each_with_index.map do |x,i|
    # replace with "-" if we are in the middle of a set of concurrent numbers
    (i > 0 and i + 1 < sorted_vals.size  and        # make sure we are in bounds
     sorted_vals[i-1].to_i == x.to_i - 1 and        # did we increment by 1
     sorted_vals[i+1].to_i == x.to_i + 1) ? "-" : x # and will we increment by 1
  end
  vals = skipped_vals.join(",")
  vals.gsub(/(,-)+/,"-").gsub("-,","-")  # get rid of the commas
end