Source Code Highlighting within Slides

I use Apple's Keynote for doing my presentations and naturally these include some bits of code that need highlighting so that it’s easier to read.

There are a few ways I could do this, the first would be to make a screenshot of the highlighted text and then insert it into the slide, this seemed like an awful lot of work to achieve something that should be so simple.

The solution was fairly obvious when I went looking, Keynote includes an object known as Webview that inserts the output of a URL into the slide, this in turn is rendered using Webkit (Safari) in the background and saved. The first time around I used a simple script with highlight_file but this was a pain when wrapping occurred.

In the end I used GESHI which is a highlight library written in PHP that supports the syntax highlighting of around 50 different programming and scripting languages. Specifically I use PHP and the SQL types, though I had to tweak it a little to add some SQLite keywords.

Installation is relatively simple, download GESHI and extract to a folder on your local web server, download my keynote.php script and put it in the same folder as GESHI and finally put some code somewhere for the file to highlight. In my case I have a folder for each talk.

The URL to do the highlighting is keynote.php?file=folder/file.php

You can see a quick example of how this looks highlighting some PHP Code is keynote looks.

There are a few other parameters that you can use to manipulate the output. They are size, language, nolines and ln. These control the text size, the language being highlighted, if lines should be shown and the line number to start at respectively

I recommend that you don't make this publically accessible in case someone attempts to view a file they shouldn't.

Comments

[Shaun]

This is great. I haven't done this before but soon will in my presentations.

Thanks!

[Lukas Kahwe Smith]

I have now used this for the first time in a talk. I was a bit concerned about readability, but it turns out this was fine. Of course its not ideal to have an image instead of normal text. But at least I can now offer a link with the examples ready to download. And of course I know that my examples in the slides actually work.

Anyways thx Scott for the idea and I wil compare my script with yours when I get home to get back to you if I have any tweaks to recommend.

[Scott MacVicar]

I used it for both my talks at php|tek which was for both PHP and SQL, both turned out fine.

I had to modify the SQL highlighter to add PRAGMA for SQLite. I'd be happy to accept some other changes.

[luckec]

I use Textmate for this. If you have some source-code you can choose "Create HTML from document" or "Create HTML from document with line-numbers" and watch this in the web-preview (Window > Show web preview). The rest is copy and paste.

[Karsten]

Hi, I stumbled across this and thought, ok, let's try. Then I looked at the other two tabs I had open in Safari, and discovered: When copying from Eclipse syntax hightlighting is preserved. By far the easiest method IMHO.

[gnibil]

Maybe this can help you. It's a nice online source code formatter.It supports almost all of the popular program languages, such as Java, PHP, Ruby, C++ etc. And you can choose the theme you like and embed it into any web you want easily.You can take it a try here
http://www.codetie.com

[Anavar]

Thanks for sharing. You pulled this out greatly. Greetings

[Mathias]

Use Pastie.org, paste your code in there, copy/paste the result to Keynote, done. :-)

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