Convert binary to Base Pairs (Experimental, for encoding files to DNA - Related to my Internship)

todna.rb

#There are 4 bases in DNA (ATGC)
#There are 4 combinations of 2 bits.
class String
    def is_i?
       !!(self =~ /^[-+]?[0-9]+$/)
    end
end
puts "Autodetecting type of input..."
inp = ARGV[0]
if inp.is_i?
	puts "Binary to BP"
else
	puts "BP to Binary"
end
out = ""
dec = ""
bptobin = {
	'A' => '00',
	'T' => '01',
	'G' => '10',
	'C' => '11'
}
bintobp = {
	'00' => 'A',
	'01' => 'T',
	'10' => 'G',
	'11' => 'C'
}
if inp.is_i?
	data = inp.scan(/../)
	data.each do |item|
		out = out + bintobp[item]
	end
	puts out
else
	out = inp.split(//)
	out.each do |char|
		#puts char
		dec = dec + bptobin[char]
	end
	puts dec
end