$ @span .sh-fn {-zbarimg} -q my-qr-code.svg  @span .sh-cmt {-# Also works with jpg, png, etc.}
QR-Code:otpauth://totp/GitHub:Mango0x45?secret=O1AIWMONKWVRJY4H&issuer=GitHub
$ @span .sh-fn {-zbarimg} -q my-qr-code.svg | @span .sh-fn {-sed} s/QR-Code:// | @span .sh-fn {-totp} -u
554210