class Erubis::Main

def usage(command=nil)
  command ||= File.basename($0)
  buf = []
  buf << "erubis - embedded program converter for multi-language"
  buf << "Usage: #{command} [..options..] [file ...]"
  buf << "  -h, --help    : help"
  buf << "  -v            : version"
  buf << "  -x            : show converted code"
  buf << "  -X            : show converted code, only ruby code and no text part"
  buf << "  -N            : numbering: add line numbers            (for '-x/-X')"
  buf << "  -U            : unique: compress empty lines to a line (for '-x/-X')"
  buf << "  -C            : compact: remove empty lines            (for '-x/-X')"
  buf << "  -b            : body only: no preamble nor postamble   (for '-x/-X')"
  buf << "  -z            : syntax checking"
  buf << "  -e            : escape (equal to '--E Escape')"
  buf << "  -p pattern    : embedded pattern (default '<% %>')"
  buf << "  -l lang       : convert but no execute (ruby/php/c/cpp/java/scheme/perl/js)"
  buf << "  -E e1,e2,...  : enhancer names (Escape, PercentLine, BiPattern, ...)"
  buf << "  -I path       : library include path"
  buf << "  -K kanji      : kanji code (euc/sjis/utf8) (default none)"
  buf << "  -c context    : context data string (yaml inline style or ruby code)"
  buf << "  -f datafile   : context data file ('*.yaml', '*.yml', or '*.rb')"
  #buf << "  -t            : expand tab characters in YAML file"
  buf << "  -T            : don't expand tab characters in YAML file"
  buf << "  -S            : convert mapping key from string to symbol in YAML file"
  buf << "  -B            : invoke 'result(binding)' instead of 'evaluate(context)'"
  buf << "  --pi=name     : parse '<?name ... ?>' instead of '<% ... %>'"
  #'
  #  -T            : don't trim spaces around '<% %>'
  #  -c class      : class name (XmlEruby/PercentLineEruby/...) (default Eruby)
  #  -r library    : require library
  #  -a            : action (convert/execute)
  return buf.join("\n")
end