class Paperclip::FileCommandContentTypeDetector

def detect
  type_from_file_command
end

def initialize(filename)
  @filename = filename
end

def type_from_file_command
  # On BSDs, `file` doesn't give a result code of 1 if the file doesn't exist.
  type = begin
           Paperclip.run("file", "-b --mime :file", file: @filename)
         rescue Terrapin::CommandLineError => e
           Paperclip.log("Error while determining content type: #{e}")
           SENSIBLE_DEFAULT
         end
  if type.nil? || type.match(/\(.*?\)/)
    type = SENSIBLE_DEFAULT
  end
  type.split(/[:;\s]+/)[0]
end