princely study

pricne.rb

#   lib/princely/asset_support.rb
#   Rails.application.assets.find_asset is useful to find asset.
#   you could get the content through
#   Rails.application.assets.find_asset('analytics.css.sass').body
#   get pathname through
#   Rails.application.assets.find_asset('analytics.css.sass').pathname
    def asset_file_path(asset)
      # Remove /assets/ from generated names and try and find a matching asset
      Rails.application.assets.find_asset(asset.gsub(%r{/assets/}, "")).try(:pathname) || asset
    end
    
# IO.popen is useful.
# http://www.ruby-doc.org/core-2.1.1/IO.html#method-c-popen
# You could use other tool, give them data or take data from them.
    def initialize_pdf_from_string(string, output_file, options = {})
      options = {:log_command => true, :output_to_log_file => true}.merge(options)
      path = exe_path
      # Don't spew errors to the standard out...and set up to take IO
      # as input and output
      path << " --silent - -o #{output_file}"
      path << " >> '#{log_file}' 2>> '#{log_file}'" if options[:output_to_log_file]

      log_command path if options[:log_command]

      # Actually call the prince command, and pass the entire data stream back.
      pdf = IO.popen(path, "w+")
      pdf.puts string
      pdf
    end

#   # Makes a pdf from a passed in string.
    #
    # Returns PDF as a stream, so we can use send_data to shoot
    # it down the pipe using Rails.
    #
    # http://www.ruby-doc.org/core-2.1.1/IO.html#method-i-close_read
    # http://www.ruby-doc.org/core-2.1.1/IO.html#method-i-close_write
    # http://www.ruby-doc.org/core-2.1.1/IO.html#method-i-gets
    # 
    def pdf_from_string(string, output_file = '-')
      pdf = initialize_pdf_from_string(string, output_file, {:output_to_log_file => false})
      pdf.close_write
      result = pdf.gets(nil)  #  nil  parameters will make it read the entire contents.
      pdf.close_read
      result.force_encoding('BINARY') if RUBY_VERSION >= "1.9"

      result
    end