generate .gml from space-separated-values.

gml.rb

#!/usr/bin/env ruby

i = 0
hash = {}
edges = ''

ARGF.each do |line|
  id1, id2s = line.strip.split /\s/
  id2s.split(",").each do |id2|
    hash[id1] ||= i += 1
    hash[id2] ||= i += 1
    next if id1 == id2
    edges.concat <<EOF
  edge [
    source #{hash[id1]}
    target #{hash[id2]}
  ]
EOF
  end
end

puts "graph ["
hash.keys.each do |node|
  print <<EOF
  node [
    id #{hash[node]}
    label "#{node}"
  ]
EOF
end

print edges

puts "]"