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5-way multiquine
Python F# Common Lisp C++ Perl Shell
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README.md

Pentaquine

This is a 5-part multiquine. A multiquine should not be mistaken for a quine relay or ouroboros program - a great example of which can be found here.

logo

The multiquine is described in great detail by David Madore (creator of Unlambda) here, but can be summed up as follows:

"A multiquine is a set of r different programs (in r different languages — without this condition we could take them all equal to a single quine), each of which is able to print any of the r programs (including itself) according to the command line argument it is passed. (Note that cheating is not allowed: the command line arguments must not be too long — passing the full text of a program is considered cheating)."

Visually, we have a graph in which we can transition to each language from any other language by specifying the appropriate command-line flag.

As a consequence, one can generate a quine relay from the 5 languages, or a subset thereof, in any sequence that you fancy.

You could also think of each language as a state, and the flags as state transitions. This suddenly looks suspiciously like some sort of state-machine, composed of quines; an interesting phenomenon.

Running it

You can boostrap the pentaquine with

$ python bootstrapper.py > pentaquine.py

Pass command-line arguments to generate successive sources:

$ python pentaquine.py pl > pentaquine.pl

Have a look at test.sh for a more comprehensive, albeit crude, testing script.

Misc

This was tested on:

  • Ubuntu 12.04

with

  • Python 2.7.3

  • Perl v5.14.2

  • newLISP v.10.4.5

  • gcc version 4.6.3

  • F# 3.0 (Open Source Edition)

License

Copyright (c) 2013 Rijnard van Tonder, @_raikey

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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