Lightweight xml utility to pluck elements

jq is an awesome utility for parsing and transforming json via the command line. I wanted something similar for xml. The following is a short ruby script which does a tiny tiny (did I say tiny?) bit of what jq does for xml. Hope you find it useful.

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#!/usr/bin/env ruby
# Author: Khaja Minhajuddin

require 'nokogiri'
require 'parallel'
require 'etc'

if ARGV.count < 2
  puts <<-EOS
  Usage:
    xml_pluck xpath file1.xml file2.xml

  e.g.
    xml_pluck "//children/name/text()" <(echo '<?xml version="1.0"?><children><name>Zainab</name><name>Mujju</name></children>')
    # prints
    Zainab
    Mujju
  EOS
  exit -1
end

xpath = ARGV.shift
Parallel.each(ARGV, in_processes: Etc.nprocessors) do |file|
  doc = Nokogiri::XML(File.read(file))
  puts doc.xpath(xpath)
end
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