Compile mustache template

mustache_cr.cr

# Beware arguments have a limit size ...
require "./mustache_cr/*"
require "option_parser"
require "json"
require "crustache"
require "base64"

module MustacheCr
  template = ""
  json = {} of String => String

  OptionParser.parse! do |parser|
    parser.banner = "Usage: mustache_cr [arguments]"
    parser.on("-t NAME", "--template=NAME", "Mustache Template as base64") { |t| template = Base64.decode_string(t) }
    parser.on("-j JSON", "--json=JSON", "JSON data to load as base64") { |j|
      json = JSON.parse(Base64.decode_string(j)).as_h
    }
  end

  # Parse a mustache template
  unless template.empty?
    renderer = Crustache.parse(template)
    # Render!
    puts Crustache.render renderer, json
  end
end