quine-relay

# Quine Relay

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## What this is

[QR.rb](https://github.com/mame/quine-relay/blob/master/QR.rb) is a Ruby program that generates
a Rust program that generates
a Scala program that generates
...(through 128 languages in total)...
a REXX program that generates
the original Ruby code again.

![Language Uroboros][langs]

[langs]: langs.png

(If you want to see the old 50-language version, see the [50](https://github.com/mame/quine-relay/tree/50) branch.)

## Usage

### Ubuntu

If you are using Ubuntu 26.04 (Resolute Raccoon), you can follow these steps.

#### 1. Install all the interpreters/compilers.

First, you need to type the following apt-get command to install them all.

    $ sudo apt-get install afnix algol68g aspectj asymptote ats2-lang bash \
      bc bsh clisp clojure cmake coffeescript crystal dc dhall \
      dotnet-sdk-10.0 elixir emacs-nox erlang execline f2c fennel fish flex \
      fp-compiler g++ gambas3-gb-pcre gambas3-scripter gap gawk gcc gdb gdc \
      genius gforth gfortran ghc ghostscript gm2 gnat gnucobol4 gnuplot \
      gobjc golang gpt groovy guile-3.0 gzip haxe icont iconx intercal \
      iverilog jasmin-sable jq kotlin ksh libevent-dev libpolyml-dev \
      livescript llvm lua5.3 m4 make minizinc mono-devel nasm neko nickle \
      nim node-typescript nodejs ocaml octave openjdk-25-jdk pari-gp \
      parser3-cgi perl php-cli pike8.0 polyml python3 r-base rakudo ratfor \
      rc regina-rexx ruby ruby-mustache rustc scala scilab-cli sed slsh spin \
      squirrel3 surgescript swi-prolog swiftlang tcl tcsh valac vim wabt \
      xsltproc yabasic yorick zoem zsh

Then, build the bundled interpreters.

    $ sudo apt-get install cmake libpng-dev libgd-dev libfl-dev groff bison curl
    $ make -C vendor

#### 2. Run each program on each interpreter/compiler.

    $ ulimit -s unlimited
    $ ruby QR.rb > QR.rs
    $ rustc QR.rs && ./QR > QR.scala
    $ scalac QR.scala && scala QR > QR.scm
    $ guile QR.scm > QR.sci
    $ scilab-cli -nb -f QR.sci > QR.sed
    $ sed -E -f QR.sed QR.sed > QR.spl
    $ spl2c < QR.spl > QR.spl.c && gcc -z muldefs -o QR -I ./vendor/local/include -L ./vendor/local/lib QR.spl.c -lspl -lm &&
      ./QR > QR.sl
    $ slsh QR.sl > QR.nut
    $ squirrel QR.nut > QR.sml
    $ polyc -o QR QR.sml && ./QR > QR.sq
    $ ruby vendor/subleq.rb QR.sq > QR.ss
    $ surgescript QR.ss > QR.swift
    $ swiftc QR.swift && ./QR > QR.tcl
    $ tclsh QR.tcl > QR.tcsh
    $ tcsh QR.tcsh > QR.t
    $ ruby vendor/thue.rb QR.t > QR.ts
    $ tsc --outFile QR.ts.js QR.ts && nodejs QR.ts.js > QR.unl
    $ ruby vendor/unlambda.rb QR.unl > QR.vala
    $ valac QR.vala && ./QR > QR.mid
    $ mono vendor/local/bin/Vlt.exe /s QR.mid && mono QR.exe > QR.v
    $ iverilog -o QR QR.v && ./QR -vcd-none > QR.vim
    $ vim -EsS QR.vim > QR.vb
    $ echo '<Project Sdk="Microsoft.NET.Sdk"><PropertyGroup><Out