Common Lisp, Development, LISP

LET-OVER-LAMBDA broken in SBCL 1.2.2

As expected, the Quicklisp distribution of LET-OVER-LAMBDA is broken by the changes to the backquote reader macro in SBCL 1.2.2; although I expect this change breaks a good portion of Paul Graham’s macro code examples from On Lisp, as well.

A quick-fix suggested on Reddit is to use a “pseudo-flatten” for SBCL that also descends into sb-impl::comma-expr of sb-impl::comma. I will be testing this fix today, and hopefully pushing an updated version for the August release of Quicklisp.

Stay tuned.

UPDATE: modified LOL:FLATTEN to descend into comma-expr of sb-impl::comma objects, but no joy. I have currently disabled DEFMACRO! based code in LET-OVER-LAMBDA until I can find a better solution, and tested this against both v1.2.2 and v1.2.0-1 of SBCL (so if nothing else, it will at least build without errors).

If anyone knows of a better solution, feel free to leave a comment here or on the GitHub Issue thread.

Common Lisp, Development, LISP

Hacking Lisp in the Cloud, Part 2

This morning I got access to the new Cloud9 IDE beta—and I have to say… WOW. It’s slicker, it’s faster, it’s more stable, auto-complete recognizes Lisp definition forms from your open workspace files such as defun and defmacro, and most importantly, it only takes seconds to get your workspace set up with RLWRAP, SBCL and Quicklisp.

The new Cloud9 IDE is running on an Ubuntu backend workspace. Cloud9 has had terminal access to your project workspace for quite some time now, but I’ve found the terminal experience to be significantly smoother in the new beta. It stays connected now, no longer timing-out on you when switching tabs or stepping away from the computer for a minute. Users can also use sudo for root access, and as a result install any debian package from apt (amongst many other things, of course). Emacs 24 is already installed by default. I suspect that SSH tunneling to a remote SWANK server from the Cloud9 workspace is also now possible.

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Common Lisp, Development, LISP, Quantum Computing, Quantum Programming, Technology

Hacking D-Wave One in Common Lisp: Introducing SILVER-SWORD

I’m pleased to announce that BURGLED-BATTERIES has not failed me (despite being far from finished), and I have been making steady progress with my Common Lisp interface to D-Wave’s Python Pack and Adiabatic Quantum Computer Simulator: SILVER-SWORD. It is now available in alpha as a Quicklisp-installable ASDF package on GitHub:

Features left to implement: reading and writing of qubo files, ising to qubo to ising converter functions, chimera graph indexing, and the BlackBox Solver.

Of course, you still need D-Wave’s Python Pack first, so unless you’re already a registered D-Wave developer, SILVER-SWORD won’t be much use to you. You will also need a few other dependencies, which are all conveniently listed in the repo’s README file.

That being said, I have already included a few tutorials, so you can at least see Common Lisp quantum energy programming in action.

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Common Lisp, Development, LISP

Two Doug Hoyte Libraries, now ready for Quicklisp!

The other day I uploaded two of Doug Hoyte’s libraries that I’ve been sitting on to GitHub: the source code from his book Let Over Lambda, featuring a number of useful macros; and his Common Lisp version of the ISAAC-32 algorithm for fast cryptographic random number generation. The libraries are ASDF- and Quicklisp- installable, tested on SBCL 1.1.7+ on Arch Linux and OS X Lion.

Doug Hoyte’s code has been modified slightly to work under SBCL and load as libraries. Both libraries, just as Doug Hoyte’s original code, are released under the BSD Simplified License (attribution required).

You can get the repos here:



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