Archive for the ‘Perl’ Category

Cool Tools To Know

Saturday, December 4th, 2010

chromatic mentioned something in the preface to his book Modern Perl that I had been looking for but hadn’t yet found.  He then went on to mention a couple of other things which were just plain neat.  I knew about one of them, but not the second and thought they were both great ideas and thought I’d try and get them wider attention. (more…)

Linking to CPAN

Saturday, November 27th, 2010

All through these blog pages, I’ve been linking to CPAN modules I’m talking about so that it’s easy for readers to find them.  I knew I was linking to specific versions, but couldn’t figure out how to link to the latest version of the module.  I noticed the docs for Task::Kensho do it, and am going to start doing it too.

The secret is to use links like this:

The %3A are the URI encoding of a : so this goes to and searches for the module name automatically.  Neat.

Shiny New Perl – Modern Perl!

Saturday, November 20th, 2010

I wrote a post last week talking about how outdated a lot of Perl seems to be, and the comments were full of people discussing it.  One of the things mentioned repeatedly was chromatic‘s new book Modern Perl.  I had seen several of the posts where he discussed the book on his blog and knew it was coming, but it was news to me that it was released

Not only is it released, but chromatic has graciously made the book available  for download as PDF.  His publisher has it as both letter-sized and A4 sized formats for print.  It’s released under one of the Creative Commons (by-nc-nd) licenses so you can use it, share it, and distribute it freely and widely.  The blog announcement mentioned above encourages you to do so. (more…)

Ugly Old Perl

Saturday, November 13th, 2010

I work as a professional Perl developer.  We have a large and complex system which is built around a lot of Perl.  This system has been in use and in place for years, and handles an astonishing amount of load, using thousands of computers to do it.

I work with some excellent engineers, who are thoughtful, intelligent, hard-working folks.  They want to make the best system they can, and they want it to be reliable and dependable.  I have great co-workers.

I keep finding Perl that looks like it was written in 1990.   I find code like this: (more…)

Stripping whitespace from both ends of a string…

Monday, March 1st, 2010

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I was just in a room with three competent, professional Perl developers, all of whom agreed that you can’t strip whitespace from both ends of a string in a single regexp. (more…)

Configuration Files and Config::JFDI

Thursday, December 10th, 2009

I wrote this some time ago, and it sat in the queue and got stale.  I’ve mentioned one place I’m not using Config::JFDI, but I’m using it other places and I thought it desrved a mention.

I mentioned my old framework had a way to infer which configuration file to use by examining the environment it was running in.  I’ve moved to the Catalyst Way of things (more or less) and that will make things easier.  A bunch of my old code can go away.

I have some useful tools to do things which do like to read the config file, too.  They used the same code.  They now use Config::JFDI.  It reads config files the same way Catalyst does, and gives you a very similar $config object you can use to look at things with.

I did have to dig in to the sources to get it to work right, even though it’s pretty well documented.


Calling Catalyst functions outside Catalyst.

Monday, November 30th, 2009

Several times, I’ve wished I could write command-line tools to manage Catalyst applications.  Those tools, invariably, needed to call some of the Catalyst functions, or at least get to the database.

I had struggled with Config::JFDI and tried to create DBIx::Class objects outside of the Catalyst models so they could be used standalone.  This sort of worked, but wasn’t as easy as I wanted.

I found a way, and it’s so simple it hurts.   I can’t help think this is one of those things the Catalyst team will read and think, “Well, duh!” but it was never clear to me and I struggled with it for months. (more…)

Reinstalling Perl.

Monday, October 26th, 2009

The break in my blogging was to start a new job.  It’s kept me incredibly busy.  I’m now a “Senior Infrastructure Architect” and being paid to write and maintain complex Perl scripts.  It means lots more things in Perl to learn and see, but may limit what I can blog about, as I have to be careful of the NDA.  I’m going to try and get back to this blog, though.

I reinstalled Perl the other day.  It was no trouble; it came with my Linux distribution.

Then I had to reinstall all the missing modules.

That should be easy!  I typed ‘autobundle’ in CPAN before I upgraded, and it wrote out a Bundle file.  All should be well!  I should just have to type “perl -MCPAN -e ‘install Bundle::Snapshot_2009_09_09 and let it go do what it needs to do.

Pity it doesn’t work that well.


Recursive Dependencies in CPAN

Saturday, June 20th, 2009

I’ve been quiet lately, as I’ve had hardware problems and haven’t done much development on my spare spare machine.  Finally got a new one, and am installing everything.


Autovivification bit me today

Tuesday, May 26th, 2009

For the first time in more than five years, I got bit by autovivification.  It’s one of those odd quirks of Perl that I’d read about, and heard the problems with but never bumped in to them.