Created
November 9, 2011 21:23
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consolidate a sequence of concurrent numbers with hyphens
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# 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 |
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