Zero Width Encoder

from sys import argv
if len(argv) <= 1:
    exit("Synthax:\npython3 script.py string to encode goes here, spaces are allowed")

def textToBits(text, encoding='utf-8', errors='surrogatepass'):
    bits = bin(int.from_bytes(text.encode(encoding, errors), 'big'))[2:]
    return bits.zfill(8 * ((len(bits) + 7) // 8))

# Used to separate bits
#zws = "\u200b" # Zero width space
# Represents a one
zwj = "\u200d" # Zero width joiner
#zwj = "a"
# Represents a zero
zwnj = "\u200c" # Zero width non-joiner
#zwnj = "b"

message = ""
for arg in argv[1:]:
    message += arg + " "
message = message[:-1]

msgBin = textToBits(message)

print("Original message: " + message)
#print("Binary message: " + msgBin)

msgZw = "".join([zwj if bit in "1" else zwnj for bit in msgBin])
print("\t==> Zero width message can be hard to copy from some terminal, they have been outputted to a text file along with instructions")
print("Zero Width message (len: {}): \"{}\"".format(len(msgZw), msgZw))
with open("zeroWidth.txt", "w") as txtFile:
        txtFile.write("vvvv COPY BELOW ({} chars) vvvv\n".format(len(msgZw)) + msgZw + "\n^^^^ COPY ABOVE ^^^^")
print("Zero width message has been saved to 'zeroWidth.txt'")