Intron Adder Quine

Question

In the context of quines, an intron (or payload) is a part of a quine that serves no purpose in producing output, but is still included in the data section. For example:

function quine() {
    const data = "function quine() {\n    const data=\"@\";\n    // Arr! This be an intron!\n    return data.replace(\"@\", JSON.stringify(data));\n}";
    // Arr! This be an intron!
    return data.replace("@", JSON.stringify(data));
}

My challenge is to write a quine that will normally run as a standard quine, but if an argument is passed in, then it returns a new quine with the argument placed somewhere in it. If that new quine is called with an argument, it should do the same. For example:

function quine(intron="") {
    const data = "function quine(intron=\"\0\") {\n    const data = \"%%%\";\n    //\0\n    return data.replace(/\u0000/g, intron).replace(\"%%%\", JSON.stringify(data));\n}";
    //
    return data.replace(/\u0000/g, intron).replace("%%%", JSON.stringify(data));
}

A few statements:

• If you have no input, then the output should be identical to the source code. If you have input, then the output only needs to:
  • Be in the same language
  • Contain the input
  • Be a solution to this challenge in its own right
• Quines only need to contain the latest intron. Introns from the program that generated it are optional.
• If your program already contains the input, then the same program is fine. For example, if it's called with the same input twice.
• The input can be assumed to be printable ASCII only.
• The shortest program in bytes wins.

Answer 1

Python 2, 70 bytes

def f(x=''):s='def f(x=%r):s=%r;print s%%(x,s,x)#%s';print s%(x,s,x)#

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A weird extension of the usual python quine s="s=%r;print s%%s";print s%s. This adds an extra %s after a comment, to output the data, and a %r in the default string to push the original string as default instead of an empty string.

Answer 2

V, 11 bytes

ñéÑvu"qpx:"

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Hexdump:

00000000: f1e9 d176 7522 7170 783a 22              ...vu"qpx:"

This is a simple modification of the standard V quine. Given the input:

Hello

this program will output:

ñéÑvu"qpx:"Hello

Which outputs:

ñéÑvu"qpx:"Hello

This works because the input is automatically appended to the end of ñéÑvu"qpx, and :" is a comment (essentially)

Answer 3

Python 3, 77 bytes

t='';s='t=input()or t;print(f"t={repr(t)};s={repr(s)};exec(s)#{t}")';exec(s)#

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Full programs. Input must be terminated with a newline, and output a trailing newline.

Equivalent Python 2 would be 76 bytes (I think).