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namespace :data do

  desc 'Data loader'
  task :load, [:data_file] do |t, args|
    puts "in rake task"
    p args
  end

end

#! /usr/bin/env bash

set -o nounset
set -o errexit

if ( ! getopts ":c:" opt); then
  rake data:load
else
  while getopts ":c:" opt; do
    case $opt in
      c)
        if [[ -f $OPTARG ]] && [[ -r $OPTARG ]]; then
          rake "data:load[${OPTARG}]"
        else
          echo "${OPTARG} is not a readable file"
          exit 1
        fi
        ;;
      \?)
        echo "Invalid option: -$OPTARG" >&2
        ;;
      :)
        echo "Option -$OPTARG requires an argument." >&2
        exit 1
        ;;
    esac
  done
fi