From: Eli Barzilay <firstname.lastname@example.org> To: email@example.com Subject: [PLT announcement] PLT Scheme v4.1.5 Date: Sun, 22 Mar 2009 01:04:29 -0400 PLT Scheme version 4.1.5 is now available from http://plt-scheme.org/ * Web Server: - new URL-based dispatching library `web-server/dispatch’, - customizable continuation serialization policies for the stateless web language `web-server/stuffers’, - abstraction of serve/servlet to build simpler dispatchers `web-server/servlet-env’, - HTTP Digest authentication support `web-server/http/digest-auth’, - built-in cookie support in `web-server/http/cookie’ and `web-server/http/cookie-parse’, - highlighting and pretty-printing of errors in Xexpr constructions, - load control dispatcher for limit concurrent sessions `web-server/dispatchers/limit’. * Scribble: - Literate programming is now available using the new `scribble/lp’ language. - A new `at-exp’ language makes it convenient to use the scribble reader’s @-expressions for general code. - The `scribble/text’ preprocessor language has been extended to deal with indentation and other formatting issues. - The "scribble" command-line tool accepts a `--pdf’ flag to render PDFs (via pdflatex). * DrScheme now provides feedback when PLaneT downloads and installs new packages. * Units & Contracts: - Elements of unit signatures can now be associated with contracts via the `contracted’ signature form. - A contract combinator for units, `unit/c’, has been added. - The new `with-contract’ form provides a nestable submodule contract boundary, protecting a group of definitions from the surrounding code with contracts. - The `define/contract’ form has been reworked and new define forms have been added: `define-struct/contract’ and `define-unit/contract’. * Language levels and teachpacks from the DeinProgramm project for the German textbook "Die Macht der Abstraktion" by Herbert Klaeren and Michael Sperber have been added. * Misc: - Typed Scheme now comes with several more pre-wrapped libraries, found in the `typed’ collection. - The `xml’ and `html’ collections are now contracted. - Binding parsing in net/cgi now interacts with `net/uri-codec’s configuration parameters. - DrScheme captures logging output. - Check syntax: it is now possible to tack arrows crossing the currently selected text. - New `bitwise-bit-field’ function. * The usual pile of bugfixes. (Notable: `scheme/package’ works, `deflate’ compression fixed, DrScheme language dialog issue resolved, `match’ fixes, Windows networking, and much more.) [Note that mirror sites can take a while to catch up with the new downloads.] Feedback Welcome, -- ((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay: http://www.barzilay.org/ Maze is Life!