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#!/usr/bin/ruby

require 'optparse'
require 'csv'

options = {:in => nil, :out => nil, :format => :yaml}

OptionParser.new do |opts|
  opts.banner = "Converter for extlookup CSV files into Hiera JSON and YAML files"

opts.on("--in FILE", "-i", "Input CSV file") do |v|
    options[:in] = v
  end

opts.on("--out FILE", "-o", "Output Hiera file") do |v|
    options[:out] = v
  end

opts.on("--json", "-j", "Create JSON format file") do |v|
    options[:format] = :json
  end
end.parse!

if options[:in].nil? || options[:out].nil?
  STDERR.puts "Please specify an input and output file with --in and --out"
  exit 1
end

unless File.exist?(options[:in])
  STDERR.puts "Cannot find input file #{options[:in]}"
  exit 1
end

csvdata = CSV.read(options[:in])
hieradata = {}

csvdata.each do |d|
  d = d.map{|item| item.to_s}

if d.size > 2
    hieradata[d[0]] = d[1, d.size].flatten
  else
    hieradata[d[0]] = d[1]
  end
end

case options[:format]
when :yaml
  require 'yaml'
  File.open(options[:out], "w") {|f| f.write hieradata.to_yaml}
when :json
  require 'rubygems'
  require 'json'
  File.open(options[:out], "w") {|f| f.write JSON.pretty_generate hieradata}
end