The AutoMagic Web Site
When I first started writing web pages, they were always static pages: straight HTML. If there was any CGI at all, it was only to handle forms. No doubt every beginning web master starts out that way, and if your web site never grows beyond a handful of pages, that's probably fine. However, as your site grows in complexity, static pages become burdensome and quite annoying to maintain.
For example, let's look at the various things that need to happen when I add a page to my site:
- First, it needs to appear in at least two index pages. This article belongs in the general Unix Articles index, the Sitemap index, and in the Unix Programs index (because it contains code).
- Within the main Unix Articles index, any article may need to appear in more than one place. This article will appear under Programming, Code, Web/HTML and Perl.
- Every article has links to every "related" article, book review or link. If those had to be updated manually every time a new page is added, that alone would be long, tedious and error-prone (there are more than 200 separate articles at my site as I write this, and of course more are added every month).
- Every new article has to be added to the proper place in What's New?.
- The search engine uses index files that need to have information about this new article added in.
- Each article displays site index navigation links at the top. Of course, I change that from time to time, and again I don't want to have to update every article.
- Similarly, each article contains a copyright notice that I may want to adjust, and each article contains style sheet information that determines font sizes, etc. I wouldn't want to have to go through every single article because I decided that the color of my <H2> tags should change!
All of this is handled by Perl scripts. The generation of the style sheet classes and the copyright notice is just simple SSI (Server Side Includes): a line in each file has this, for example:
<!--#include virtual="/cgi-bin/copyright.pl" -->
As you may already know, such a line (on a server that supports SSI) will cause the displayed web page to have the text generated by the script that it calls. The "copyright.pl" generates the boilerplate copyright, and a similar line generates the style sheets.
The rest of it all happens because one line that describes the article is added to a data file that a number of other programs read. That data file looks like this:
ARTICLES:/Unixart/linppp.html:Red Hat Linux as a PPP Server:January 1999:Tony Lawrence:Linux|Networking ARTICLES:/Opinion/java.html:Java? :January 1999:Tony Lawrence:Opinion ARTICLES:/Reviews/wt5.1.html:Winterm 5000 Terminal:January 1999:Tony Lawrence:Reviews|Modems/Terminals|Networking ARTICLES:/Reviews/proxyserv.html:Review of Netscape Proxy Server:February 1999:Tony Lawrence:Reviews|Security|Networking ... ARTICLES:/Unixart/linkfail.html:Kernel Link Failures:September 2000:Tony Lawrence:Installation|Kernel/Internals ARTICLES:/Reviews/logmon.html:Logmon Inactivity Reporter:September 2000:Tony Lawrence:Reviews ARTICLES:/Opinion/technofable.html:Technofable- James Richardson:September 2000:James Richardson:Opinion ARTICLES:/Linux/linrh70.html:Red Hat 7:October 2000:Tony Lawrence:Linux|Reviews ARTICLES:/Unixart/vdom_eng.html:Mail in a Virtual Domain:October 2000:Roberto Zini:Mail|Installation
Every index page gets information from this file by way of a Perl script. Additionally, every page shows pages related to itself by another script that also reads this file.
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