ruby validate-links.rb /mnt/hgfs/daustin/work/linkQA.csv validate-links.rb:6:in `<main>': undefined local variable or method `hit_links' for main:Object (NameError)

validate-links.rb

#!/usr/bin/env ruby

require 'net/http'
require 'csv'

write_to_file(hit_links)

def read_file
  file = File.open(ARGV[0]).read
  return file
end

def hit_links
  responses = []
  urls = read_file
  urls.each_line {|l|
    url = URI.parse(l)
    req = Net::HTTP.new(url.host, url.port)
    res = req.get(url.path)
    responses.push({ url => l, status => res.code})
  }
  return responses
end

def write_to_csv(responses) 
  CSV.open('results.csv', 'wb') {|csv|
    responses.each {|k,v|
      csv << [k, v]
    }
  }
end