Zach's Journal

Franz code on github

2009-07-13T13:20:07Z

From Johan Lindberg I learned that Franz has an awful lot of Common Lisp code on GitHub. Enjoy!

Lisp Hacker of the Week: Jakub Higersberger

2009-07-10T12:54:34Z

Jakub "Ramarren" Higersberger is very active on github with a variety of useful Common Lisp projects. For example, cffi-clutter, a fork of Cells, cffi-j, png-read, opengl-text, unit-formula, cffi-redland, cl-parser-combinators, ropes, color-gradients, cl-transactional (a STM experiment), cl-symbolic-math, and cl-geometry. Go check that stuff out!

Meet Los Angeles Lisp nerds

2009-07-09T12:50:38Z

I've been slack on my Lisp user group calendar, sorry. If you have a user group meeting coming up, won't you please let me know? You can also tell me on twitter, where I'm xach.

The CRACL group is meeting on July 19th. The Twin Cities Lispers are meeting on July 14th. The Toronto group met a few days ago. You need a time-travelling debugger to catch that one, sorry.

Lisp time nerds, take note

2009-07-08T19:46:43Z

(multiple-value-list (decode-universal-time 3456789012 0)) 
=> (12 10 3 17 7 2009 4 NIL 0)

That's just a few short days away. Plan accordingly.

No more mudballs development for now

2009-07-07T13:15:03Z

I mentioned mudballs a few months ago. Its maintainer, Sean Ross, recently announced that he was no longer able to continue mudballs maintenance and development.

what does it mean?

2009-07-06T20:39:33Z

Do you read Russian? Can you tell me what this page says? I'm just trying to get a basic understanding: do they like it? Do they hate it? Do they have any criticism or praise?

Happy birthday, Isaac!

2009-07-01T13:21:46Z

Happy first birthday, Isaac! A year ago seems like just yesterday.

Bay Area Lisp meeting on July 19, 2009

2009-06-24T16:56:32Z

This sounds pretty cool:

So finally, here is the skinny on the Sunday, July 19th in the big
conference room at Franz Inc:

6:00pm ~ Meet in front of the Franz office (2201 Broadway, Suite 715,
Oakland, CA 94612). The kind folks at Franz Inc will herd us cats up
to their big conference room before 6:15.

6:15pm ~ Introduction to Clojure

Amit Rathore will give an introduction to Clojure aimed at lispers.

6:45pm ~ Milk and cookies (http://www.meetup.com/balisp/polls/189504/)

7:00pm ~ Coders at Work: The Lisp Perspective

Peter Seibel talks about the interviews from his new book Coders at
Work (http://www.codersatwork.com/),
particularly what his subjects had to say about Lisp and Lisp related
topics. Will include bits that didn't
make it into the book.

7:30pm ~ Coders at Work QA

7:45pm ~ &optional Belgian beer outside and around the corner at Lukas

Thanks for staying tuned, hope to see you there. For more info see:

http://www.meetup.com/balisp/calendar/10589286/

RIP, Erik Naggum

2009-06-21T11:47:53Z

Erik Naggum was the first person I killfiled in GNUS. His style was sometimes shockingly blunt and aggressive. After a while, though, I realized I was missing out, and I came to treasure the information and insight in his messages.

I learned yesterday that Erik died. I'm sorry to hear it; I occasionally contacted him to clarify or expand on some technical matter he wrote about in the past, and he was always helpful. I thought I would just be able to do that whenever I wanted, but now it's too late.

His death has, not surprisingly, led some people to go through the same initial experience I had, seeing some blunt and shocking language and wondering why anyone would care about its author. Here are some links that I hope show a small part of Erik's contributions to knowledge.

I think a newcomer would benefit from reading two in particular:

Erik Naggum's ideas and principles - each one is worth reading
The difference between interactions gone wrong and interactions gone right with Erik Naggum.

Here are the rest, taken from my bookmarks:

Lisp

Unix solutions vs. Lisp solutions for the same problems

A lengthy explanation of types as they relate to CL

How much use of CLOS?

Programming in Lisp, delivering in some other language

A cute read macro dispatch scheme

Lazy-loading with SLOT-UNBOUND

Using CHANGE-CLASS for object "deletion"

"Unix quality" vs "Lisp quality", with sockets as an example

"if you can't outperform C in CL, you're too good at C. " (see the whole thread for details)

Alist vs. plist

What Lisp could take from C

Destructors, finalizers, weak pointers

Kitchen hygiene compared to Lisp hygiene

Design patterns for Lisp

Misc

An introduction, written just two months ago

The Long, Painful History of Time

The oil industry in Norway is really big

The "Norwegian Dream" (vs the American Dream) is to win the lottery

"most everything worth doing is associated with effort and some pain"

"Western culture is favorable to mediocre people and hostile to smart ones"

Core ideas behind SGML and XML

Feedback loops of lisp, reward, punishment, psychotic environments

"the market does not in fact lead anything or anywhere"

"Just let other people have their desires and needs. Do not let them affect yours."

The purpose of a newsgroup

"Which is the best car? How do you choose?"

"One general concept of the free exchange of information on the Net is that people are equals in principle and that their differences are the nothing more than accidents of time."

Learning new things

"How come people with the most misguided political ideas believe revolution is the answer and people with reasonable political ideas manage to succeed in slowly transforming their society to their liking? Please think about it."

"If you have to subordinate your defense of truth or what you believe in to who else believes it, I seriously suggest you rethink your value system."

A tribute to Yuri Rabinsky

Adapting emacs for rapid prose editing

"It is a really bad idea to believe that one can learn to get it right from doing it wrong many times."

The purpose of higher education

Erik's computer-oriented biography

Books in Erik's library

Tokenizing/parsing

A bibop-style memory management scheme

"people seem unable to get over the fact that they no longer want to use a language and just move on to something better"

First TC Lispers meeting

2009-06-12T15:29:03Z

It sounds like the first TC Lispers meeting was a success. Patrick Stein really liked it.

Linux Google Chrome beta

2009-06-12T13:15:27Z

I got the Ubuntu Google chrome beta. It's really fast. A couple things about it surprised me.

First, I was surprised when apt-get upgrade automatically updated Chrome. The Chrome deb hooks into the apt update machinery, and adds a key to your approved key list. It even creates a crontab entry that restores the apt configuration:

# It creates the repository configuration file for package updates, and it
# monitors that config to see if it has been disabled by the overly aggressive
# distro upgrade process (e.g.  intrepid -> jaunty). When this situation is
# detected, the respository will be re-enabled.

Second, I heard that V8 was 32-bit only, and I have a 64-bit system. Is it 64-bit now? Nope. It installs a bunch of 32-bit libraries:

$ dpkg-query -L google-chrome-unstable | grep '\.so'
/opt/google/chrome/lib32/libssl3.so.1d
/opt/google/chrome/lib32/libnspr4.so.0d
/opt/google/chrome/lib32/libsqlite3.so.0.8.6
/opt/google/chrome/lib32/libsoftokn3.so
/opt/google/chrome/lib32/libplds4.so.0d
/opt/google/chrome/lib32/libplc4.so.0d
/opt/google/chrome/lib32/libfreebl3.so
/opt/google/chrome/lib32/libnss3.so.1d
/opt/google/chrome/lib32/libnssckbi.so
/opt/google/chrome/lib32/libsmime3.so.1d
/opt/google/chrome/lib32/libnssdbm3.so
/opt/google/chrome/lib32/libnssutil3.so.1d
/opt/google/chrome/lib32/libsqlite3.so.0

I was bummed it wasn't "real" 64-bit.

Survey results: Lisp-2-ness is used by many

2009-06-07T22:27:19Z

Thanks to the many who responded to my survey on comp.lang.lisp and on my blog. It seems like more than 80% of the more than 60 people who responded do not avoid using the same names for variables and functions.

The original statement that inspired the survey was posted to the arc forum a few days ago.

Survey: Do you use the "2" in Lisp-2?

2009-06-04T20:06:07Z

I came across this approximate statement today:

Lisp-2 programmers avoid using the same names for functions and variables.

That didn't sound right to me. I use Common Lisp, and I couldn't come up with any personal examples of avoiding that practice. I also couldn't remember actively thinking about the issue at all; I just use whatever variable names seem natural.

Then I tried to think of examples when I did use variables with the same name as a function: I often use the variable name list, and I often have variables with the same name as a slot accessor (I don't use the foo-of convention). But it hasn't been an active, conscious decision when writing, and it doesn't jump out at me when re-reading as some kind of clash.

So my survey question is this: Are you are a Lisp-2 programmer, and do you avoid using the same names for functions and variables? Let me know.

update Here is a short summary of the results.

Chipz vs. YA Deflate

2009-06-04T13:30:25Z

Pierre Mai released his new deflate inflating library yesterday, so I did little bit of testing against Chipz. On my Core 2 Duo system with 64-bit SBCL, Chipz is about 25% faster at inflating. Pierre says his program is "...for those who need something with a less restrictive license or better performance than is currently freely available", but it seems to me that the main advantage over Chipz is that it has a very simple interface and lives in a single file.

I didn't try it against inflate.cl because that file was recently updated and uses Allegro CL-specific code now.

Also, when fiddling around making a test file, I was pleased to see this:

(time (salza2:gzip-file "kjv10.txt" "kjv10.salza2.gz"))
Evaluation took:
  0.546 seconds of real time
  0.540000 seconds of total run time (0.540000 user, 0.000000 system)
  98.90% CPU
  981,743,175 processor cycles
  279,984 bytes consed

$ time gzip -c kjv10.txt > kjv10.gzip.gz

real    0m0.624s
user    0m0.630s
sys     0m0.000s

But sad to see this:

$ ls -l kjv10.*.gz 
-rw-r--r-- 1 xach xach 1403140 2009-06-04 06:52 kjv10.gzip.gz
-rw-r--r-- 1 xach xach 2014735 2009-06-04 06:52 kjv10.salza2.gz

It's not so hard to be fast when you do a bad job. :)

I'm sure they'll get right on it

2009-06-03T16:29:23Z

You can view past photos on bing, but only with the help of the silverlight plugin. I'm using Linux, but what the hell, I'll click the "Install Silverlight" link anyway. It goes here:

The site that you visited was built for an earlier, beta version of Silverlight - not the current one. Please contact the site owner to let them know that they must upgrade to the latest release of Silverlight 2. Let us know if the site is not updated shortly so we can try to assist in upgrading the site to the latest Silverlight technology.

Right hand, expect an email from the left hand shortly.

Lisp links

2009-06-03T11:51:58Z

If you're looking for interesting Lisp links, Rainer "lispm" Joswig and others are posting frequently to the Lisp subsite of reddit.com.

Un-American

2009-05-31T23:11:43Z

I was flipping through Eisenhower's Mandate for Change at random today, and came across this passage on page 331:

Supporters of McCarthyism represented it as simply a dramatic effort to awaken the public to the existence of some Communist penetration into all facets of our national life and to warn everyone of the need for universal alertness. Perhaps at its beginning the movement may have had some such usefulness. But almost immediately its methods defeated its purported objectives. Un-American activity cannot be prevented or routed out by employing un-American methods; to preserve freedom we must use the tools that freedom provides.

Animation fun

2009-05-28T19:43:53Z

I had an idea for visualizing the different curves and lines in a font's glyphs, and the above is an early stab at realizing it. I'm thinking of making a Wigflip generator out of it, but I need to tune it. This graphic took almost 8 seconds to draw on a fast system.

Movie charts

2009-05-28T14:06:16Z

If you're an LJ user, you should add moviecharts!

PSA: Do not read

2009-05-27T16:53:31Z

The Netscape LiveWire Sourcebook (1996) is not very good when it comes to JavaScript. For example, here's how it explains eval():

eval(5 + 3) => 8

It also mixes up server-side LiveWire features with client-side features.

Trailer trash

2009-05-24T14:44:58Z

The trailer for Sherlock Holmes made it look like crap, too.

Terminator Salvation stank

2009-05-24T11:47:27Z

Many of the things I disliked about Terminator Salvation weren't isolated but systemic. The camera work, for example, had a lot of arbitrary it-could-only-be-computer-generated shots a la David Fincher. Skynet was super-intelligent, except when it would be inconvenient to the plot; it would be a short movie if Skynet found the pathetically non-hidden hidden base and blew it up in the first couple minutes.

Also there was a pointless adorable moppet.

Much of the movie is obviously a computer simulation. That's not a crime. I enjoyed Watchmen, which had a similar level of fakery. But there was also a non-CGI scene in Terminator where helicopters roared overhead as napalm exploded in a forest, a clear echo of Apocalypse Now. Except the Terminator scene looked cheap and wimpy, and the Apocalypse scene looked audacious and excessive, a real spectacle.

The military configuration was unrealistic. The population of a modern military is dominated by the people who support and maintain the complex technology and equipment. In Terminator, it wasn't clear where "the resistance" hid all the technicians and mechanics needed to maintain their helicopters and jet aircraft.

The trailer shows a character who is a cyborg and doesn't know it. From this premise I constructed an interesting movie in my head about a resistance infiltrated by unwitting cyborgs and crippled by paranoia: who can you trust? Can you even trust yourself?

But it turns out that character isn't just any character, but in fact the main character, and if you saw the trailer you already know all about the cyborg thing and they don't do anything non-obvious with it.

A scene late in the movie reminded me of Syndrome line in The Incredibles: "You got me monologuing! You sly dog!"

So anyway, the trailer for Star Trek made me not want to watch it, but everyone loved it. The trailer for Terminator made me want to watch it, and everyone hated it. I guess the lesson is not to watch trailers.

Lisp as a game server - Neuroarena

2009-05-13T18:09:43Z

Rainer Joswig posted to reddit about a Flash game called Neuroarena. The forum discussion has some cool screenshots, and later in the discussion the developer Karol outlines the use of SBCL to support the game:

Battle server is written completely in Common Lisp (no C library used). We use SBCL (www.sbcl.org) which proved to be an absolutely fantastic development *and* production tool (we had just one minor hassle with garbage collector conservatism). It is used for all the actual game computation:

keeping correct state of world (collision detection, ...)
pathfinding
AI

For the AI, we have created our own visual language/compiler for describing AI based on graph representation, and that language is compiled using CL to quite performant native code. We are using library I wrote some time ago for matching graph patterns describing the the AI behaviour (http://common-lisp.net/project/patg)

Very cool.

New Lisp user group meeting

2009-05-08T18:35:34Z

Bill Clementson has the details of a new Minneapolis Lisp user group. The inaugural meeting is on June 9th.

CXML is a great Common Lisp XML processing library

2009-05-06T12:52:18Z

Closure XML aka CXML is a great library for consuming and producing XML data with Common Lisp. I use it to work with the Google Data APIs, the Flickr API, and a lot of other stuff. It supports everything I've ever needed to do. It's under active development. It has thorough documentation. If you ever need to process XML with Common Lisp, CXML is a safe bet.