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LeftParen lets you make web apps quickly.

LeftParen 0.61 is a PLT Scheme web app framework. LP is in its early stages, and I need your help to improve it. Please contact support@leftparen.com with any questions, suggestions, or ideas. The documentation is pretty limited at this point, so please don't hesitate to email me with even the silliest of questions.

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News

Jan 9th 2009
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LeftParen 0.51 is out!

Update: I did an incremental update to 0.51 to lock in some particular versions of 3rd party PLaneT packages.  There was a problem with the (1 8) version of dispatch.plt, so LeftParen currently now uses (1 7).

LeftParen now requires PLT Scheme 4.1.3.9 or greater—sorry about that.  It’s just that some pretty hefty changes (and improvements!) happened to the web server in the last few PLT releases.  LeftParen used to use the Instaservlet PLaneT package, but, because its functionality is now essentially present in built-in PLT Scheme, we now just use the built-in stuff.  This change triggered a bunch of simplifications to the LeftParen code.  The upside is obvious, but the downside is that your “legacy” LeftParen web apps won’t run without slight modification.

To upgrade your existing apps, I recommend running the hello-world tutorial to get an idea for the slightly changed structure of LeftParen projects.  If you run into any trouble upgrading, don’t hesitate to email support at leftparen.com.

There are a number of other smaller changes included in 0.51.  One addition of note is facebook.ss, which is the beginning of LeftParen support for the Facebook app API.  Unfortunately, it’s not ready for use yet (seriously), so look, but don’t touch!

Features

Acknowledgements

LeftParen was written by Rob Hunter but it builds heavily on (and, in fact, often directly incorporates) the work of Untyped (instaservlet and dispatch), Jens Axel Soegaard (web.plt), and, of course, PLT Scheme.

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