Method: Argos::Ascii.type

Defined in:
lib/argos/ascii.rb

.type(filename) ⇒ String

Detect Argos ASCII filetype (“ds” or “diag” or nil)

“ds”|“diag”

Parameters:

  • filename (String) —

    Argos (DS or DIAG) file

Returns:

  • (String) 


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# File 'lib/argos/ascii.rb', line 9

def self.type filename
  
  if File.file? filename
    # Avoid invalid byte sequence in UTF-8 (ArgumentError)
    firstline = File.open(filename, :encoding => "iso-8859-1") {|f| f.readline}
  else
    firstline = filename
  end
  
  case firstline
    when Argos::Ds::START_REGEX, Argos::Ds::START_REGEX_LEGACY
      "ds"
    when Argos::Diag::START_REGEX
      "diag"
    when "", nil
      raise ArgumentError, "Not a file or empty string: #{filename}"
    else nil
  end 
end