Blog Posts

Get Firefox!

Those who know me know that I love linux and open source. One particular program that firmly committed me to open source software is the Mozilla project -- a project that took the Netscape browser's codebase and ran with it to places I know I never anticipated when I first heard of the project.

What do I like about Mozilla? Well, for starters, and most importantly, tabbed browsing changed the way I work. What is tabbed browsing? It's the ability to have multiple tabs in a browser window, allowing you to switch between web pages without needing to switch windows.

Mozilla came out with a standalone browser a number of months back called, first Phoenix, then Firebird, and now Firefox. This standalone browser has a conservative number of basic features, which allow for a lean download -- and yet, these basic features, which include tabbed browsing and disabling popups, far surpass Internet Explorer's features. And there are many extensions that you can download and integrate into the browser.

One such extension is a tabbed browsing extension that makes tabbed browsing even more useful. With it, I can choose to have any links leaving a site go to a new tab; or have bookmarks automatically load in a new tab; or group tabs and save them as bookmark folders; or drag a tab to a different location in the tabs (allowing easy grouping).

Frankly, there's few things I can find that Firefox can't do.

And, on top of that, it's not integrated into the operating system. So, if you're on Windows, that means if you use Firefox, you're less likely to end up with spyware and adware -- which often is downloaded and installed by special IE components just by visiting sites -- ruining your internet experience.

So, spread the word: Firefox is a speedy, featureful, SECURE alternative to Internet Explorer!

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Cgiapp Roadmap

I've had a few people contact me indicating interest in Cgiapp, and I've noticed a number of subscribers to the freshmeat project I've setup. In addition, we're using the library extensively at the National Gardening Association in developing our new site (the current site is using a mixture of ASP and Tango, with several newer applications using PHP). I've also been monitoring the CGI::Application mailing list. As a result of all this activity, I've decided I need to develop a roadmap for Cgiapp.

Currently, planned changes include:

  • Version 1.x series:
    • Adding a Smarty registration for stripslashes (the Smarty "function" call will be sslashes).
    • param() bugfix: currently, calling param() with no arguments simply gives you a list of parameters registered with the method, but not their values; this will be fixed.
    • error_mode() method. The CGI::Application ML brought up and implemented the idea of an error_mode() method to register an error_mode with the object (similar to run_modes()). While non-essential, it would offer a standard, built-in hook for error handling.
    • $PATH_INFO traversing. Again, on the CGI::App ML, a request was brought up for built-in support for using $PATH_INFO to determine the run mode. Basically, you would pass a parameter indicating which location in the $PATH_INFO string holds the run mode.
    • DocBook tutorials. I feel that too much information is given in the class-level documentation, and that usage tutorials need to be written. Since I'm documenting with PhpDoc and targetting PEAR, moving tutorials into DocBook is a logical step.
  • Version 2.x series:
    Yes, a Cgiapp2 is in the future. There are a few changes that are either necessitating (a) PHP5, or (b) API changes. In keeping with PEAR guidelines, I'll rename the module Cgiapp2 so as not to break applications designed for Cgiapp.

    Changes expected include:
    • Inherit from PEAR. This will allow for some built in error handling, among other things. I suspect that this will tie in with the error_mode(), and may also deprecate croak() and carp().
    • Changes to tmpl_path() and load_tmpl(). In the perl version, you would instantiate a template using load_tmpl(), assign your variables to it, and then do your fetch() on it. So, this:
      $this->tmpl_assign('var1', 'val1');
      $body = $this->load_tmpl('template.html');
                      
      Becomes this:
      $tmpl = $this->load_tmpl();
      $tmpl->assign('var1', 'val1');
      $body = $tmpl->fetch('template.html');
                      
      OR
      $tmpl = $this->load_tmpl('template.html');
      $tmpl->assign('var1', 'val1');
      $body = $tmpl->fetch();
                      
      (Both examples assume use of Smarty.) I want to revert to this behaviour for several reasons:
      • Portability with perl. This is one area in which the PHP and perl versions differ greatly; going to the perl way makes porting classes between the two languages simpler.
      • Decoupling. The current set of template methods create an object as a parameter of the application object - which is fine, unless the template object instantiator returns an object of a different kind.
      Cons:
      • Smarty can use the same object to fill multiple templates, and the current methods make use of this. By assigning the template object locally to each method, this could be lost.

        HOWEVER... an easy work-around would be for load_tmpl() to create the object and store it an a parameter; subsequent calls would return the same object reference. The difficulty then would be if load_tmpl() assumed a template name would be passed. However, even in CGI::App, you decide on a template engine and design for that engine; there is never an assumption that template engines should be swappable.
      • Existing Cgiapp1 applications would need to be rewritten.
    • Plugin Architecture: The CGI::App ML has produced a ::Plugin namespace that utilizes a common plugin architecture. The way it is done in perl is through some magic of namespaces and export routines... both of which are, notably, missing from PHP.

      However, I think I may know a workaround for this, if I use PHP5: the magic __call() overloader method.

      My idea is to have plugin classes register methods that should be accessible by a Cgiapp-based class a special key in the $_GLOBALS array. Then, the __call() method would check the key for registered methods; if one is found matching a method requested, that method is called (using call_user_func()), with the Cgiapp-based object reference as the first reference. Voila! instant plugins!

      Why do this? A library of 'standard' plugins could then be created, such as:
      • A form validation plugin
      • Alternate template engines as plugins (instead of overriding the tmpl_* methods)
      • An authorization plugin
      Since the 'exported' methods would have access to the Cgiapp object, they could even register objects or parameters with it.

If you have any requests or comments on the roadmap, please feel free to contact me.

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New site is up!

The new weierophinney.net/matthew/ site is now up and running!

The site has been many months in planning, and about a month or so in actual coding. I have written the site in, instead of flatfiles, PHP, so as to:

  • Allow easier updating (it includes its own content management system
  • Include a blog for my web development and IT interests
  • Allow site searching (everything is an article or download)

I've written it using a strict MVC model, which means that I have libraries for accessing and manipulating the database; all displays are template driven (meaning I can create them with plain-old HTML); and I can create customizable applications out of various controller libraries. I've called this concoction Dragonfly.

There will be more developments coming -- sitewide search comes to mind, as well as RSS feeds for the blog and downloads.

Stay Tuned!

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What's keeping that device in use?

Ever wonder what's keeping that device in use so you can't unmount it? It's happened to me a few times. The tool to discover this information? lsof.

Basically, you type something like: lsof /mnt/cdrom and it gives you a ps-style output detailing the PID and process of the processes that are using the cdrom. You can then go and manually stop those programs, or kill them yourself.

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PHP and Template Engines

On PhpPatterns, I recently read an article on Template Engines in PHP. It got my ire up, as it said (my interpretation):

  • "template engines are a bad idea"
  • "templating using PHP natively can be a good idea"
  • "template engines... are not worth the text their written in"

Okay, so that's actually direct quotes from the article. I took issue with it, immediately -- I use Smarty for everything I do, and the decision to do so was not done lightly. I have in fact been advocating the use of template engines in one language or another for several years with the various positions in which I've been employed; I think they are an essential tool for projects larger than a few pages. Why?

  • Mixing of languages causes inefficiency. When I'm programming, it's incredibly inefficient to be writing in up to four different languages: PHP or Perl, X/HTML, CSS, and Javascript. Switching between them while in the same file is cumbersome and confusing, and trying to find HTML entities buried within quoting can be a nightmare, even when done in heredocs. Separating the languages into different files seems not only natural, but essential.
  • Views contain their own logic. In an MVC pattern, the final web page View may be dependent on data passed to it via the Controller; however, this doesn't mean that I want the full functionality of a language like PHP or Perl to do that. I should only be doing simple logic or looping constructs -- and a full scripting language is overkill. (I do recognize, however, that template engines such as Smarty are written using PHP, so the language is being invoked regardless. What I speak of here is the language used to compose the template.)
  • Abstraction and Security. The fewer internals that are divulged on the template page, the better. For security purposes, I may not want clients able to know how data got to the page, only what data is available to them. In addition, if this data is abstracted enough, any number of backends could be connected to the page to produce output.

So, reading the aforementioned article really got my hackles up. However, it got me thinking, as well. One issue raised is that PHP can be used as your templating language. While I can understand why this might be desirable -- everything from load issues to flexibility -- I also feel that this doesn't give enough abstraction.

Using PHP seems to me to be inefficient on two fundamental levels, based on my understanding of The Pragmatic Programmer:

  • Domain Langauge. The Pragmatic Programmer suggests that subsets of a language should be used, or wholly new mini-languages developed, that speak to the domain at hand. As an example, you might want to use a sharp tool to open a can; an axe would be overkill, but a knife might work nicely. Using PHP to describe a template is like using an axe to open a can; it'll do the job, but it may also make a mess of it all, simply because it's too much sharp edge for the job.
  • Metadata. Metadata is data about data; to my thinking, templates describe the data they are communicating; the compiled template actually contains the data. In this regard, again, putting PHP into the script is overkill as doing so gives more than just some hints as to what the data is.

The author of the article also makes a case for teaching web designers PHP -- that the language is sufficiently easy to pick up that they typically will be able to learn it as easily, if not more easily, than a template language. I agree to a degree... But my experience has shown that web designers typically struggle with HTML, let alone PHP. (Note: my experience in this regard is not huge, and I'm sure that this is an exaggeration.) I find that it's typically easiest for me to give an example template, explain what the funny, non-HTML stuff can do, and let them go from there. Using this approach, they do not need to learn anything new -- they simply work with placeholders.

Still, I think the author raises some fine points. I wish he'd bothered to do more research into why people choose template engines and the benefits that arise from using them before simply outright slamming them. Of course, the article is also a bit dated; it was written over two years ago, and much has changed in the world of PHP and many of its template engines. I'm curious as to whether they would feel the same way today.

Me? My mind is made up -- the benefits, in my circumstances, far outweigh any costs associated. I'll be using template engines, and Smarty in particular, for years to come.

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Binary packages for Gentoo

I'd read that you could get binary packages for gentoo, thus alleviating the need to compile everything. (Of course, then you lose some of the benefits of compiling everything, but you gain in speed...) Unfortunately, I mistook this with ebuilds, and never quite figured it out.

The key is to throw the -g flag:

    % emerge -g gnumeric # which is like 'emerge --getbinpkg gnumeric'

I also learned how to update packages tonight:

    % emerge sync             # to sync your mirror with the gentoo mirrors
    % emerge --update portage # if necessary
    % emerge --update system  # updates core system files
    % emerge --update world   # updates all packages 

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Gentoo for several weeks

I've had a bunch of problems with my new computer -- it uses ACPI, but if I load the ACPI modules, it won't boot; if I don't load them, I have to go through contortions to get the ethernet working, and it won't power down; and a bunch of other little stuff.

So, a few weeks ago, I thought, what the heck? Why not try Gentoo? I've been reading about it since it first came out, and I remember talking with Duane about it once, and it has a reputation for both being cutting edge and stable. Heck, even Wil Wheaton's endorsing it... it can't be all bad, right?

I had a few misstarts -- bad CDs, not quite getting how the chroot thing worked, problems with DNS (which I still don't understand; and Rob has them as well, so it's not just me). But once I got it installed... well, I'm impressed.

The thing about Gentoo is, it compiles everything from source. It's like Debian, in that it fetches all dependencies and installs those... but it's all source. So it's not exactly fast. But because everything is compiled, and because you setup C flags specific to your machine, what you get is incredibly optimized for your own machine. This 1.6GHz machine simply flies. And the memory usage just stays low.

I'd like to use it for my server... but I can't really take the server down at this point when it's making both my mom and myself money. But what a great system... I only wish I'd used it for the mail server at work.

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Cgiapp: A PHP Class

After working on some OO classes yesterday for an application backend I'm developing for work, I decided I needed to create a BREAD class to make this simpler. You know, Browse-Read-Edit-Add-Delete.

At first, I figured I'd build off of what I'd done yesterday. But then I got to thinking (ah, thinking, my curse). I ran into the BREAD concept originally when investigating CGI::Application; a number of individuals had developed CGI::Apps that provided this functionality. I'd discarded them usually because they provided more functionality than I needed or because they introduced more complexity than I was willing to tackle right then.

But once my thoughts had gone to BREAD and CGI::App, I started thinking how nice it would be to have CGI::Application for PHP. And then I thought, why not? What prevents me from porting it? I have the source...

So, today I stayed home with Maeve, who, on the tail end of an illness, evidently ran herself down when at daycare yesterday, and stayed home sleeping most of the day. So, while she was resting, I sat down with a printout of the non-POD code of CGI::App and hammered out what I needed to do. Then, when she fell asleep for a nap, I typed it all out and started testing. And, I'm proud to say, it works. For an example, visit my development site to see a very simple, templated application in action.

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B. Gates: Open Source Programmer?

I just read coverage of a panel of programming luminaries on Salon; the topic of discussion was about the state of programming. In the course of the discussion, the subject of Open Source came up. Several of the luminaries -- which included architects of the Mac OS and Windows, as well as others -- derided the community for basically reinventing the wheel, and wheels that need to be re-thought entirely anyways. One questioned, "Why is hte idealism just about how the code is shared -- what about idealism about the code itself?"

Andy Hertzfeld (who helped develop the original Mac OS) was sitting on the panel, and jumped in. He has been working with Eazel and Chandler in recent years, and thus has an inside view of open source. His initial comment: "It's because they want people to use the stuff!" Basically, they program Windows- or Mac-like interfaces because then people will be willing to try it out. They program office suites because people "need" an office suite to be productive. Such offerings hook them into the OSS movement.

Another participant, Dan Bricklin (of VisiCalc, a pioneering spreadsheet program) shared an anecdote from Bill Gates. Evidently, Gates gave an interview (with Lammers -- look up this person) in which he explained that his work on MS's BASIC compiler was done by looking at how other programmers had accomplished the task. In his own words, "The best way to prepare is to write programs, and to study great programs that other people have written. In my case, I went to the garbage cans at the Computer Science Center and I fished out listings of their operating systems."

So basically, Gates was an early adopter of OSS methodologies... Interesting to see that today he's so protective of MS code. Guess money might do that to you.

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POD for PHP

I was lamenting at work the other day that now that I've discovered OO and templating with PHP, the only major feature missing for me is a way to easily document my programs. I'm a big fan of perl's POD, and use it fairly extensively, even for simple scripts -- it's a way to provide a quick manual without needing to worry too much about how to format it.

So, it hit me on the way home Friday night: what prevents me from using POD in multiline comments of PHP scripts? I thought I'd give it a try when I got home.

First I googled for 'POD for PHP', and found a link to perlmongers where somebody recounted seeing that exact thing done, and how nicely it worked.

Then I tried it.. and it indeed worked. So, basically, I've got all the tools I love from perl in PHP, one of which is borrowed directly from the language!

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