Mosh Scheme is
A Fast R6RS Scheme interpreter.
I saw Mosh referenced on the SRFI-98 email discussion archive.
There already a wiki written using Mosh.
Addendum 7/18/8:
Mosh has been updated to version 0.0.5.
Tag: Scheme
SRFI 98: An interface to access environment variables
This announces the availability for discussion of
Scheme Request for Implementation 98
“An interface to access environment variables.”
by Taro Minowa(Higepon).
Its draft and an archive of the ongoing discussion is available at
(via Usenet)
erlang-scheme interop
Eric Sessoms announced his Erlang-Scheme interoperability library recently on the PLT discussion list.
What it is: Basically, it’s a port of Distel from emacs lisp over to
scheme. It talks to erlang using its own protocol and impersonates an
erlang node on the network. It aims to provide an abstraction such
that erlang processes look like scheme threads, and vice-versa.
Communication from scheme to erlang is done with (a wrapper around)
thread-send. Messages from erlang to scheme get routed to thread
mailboxes so that they can be picked up with thread-receive.
The 90 Minute Scheme to C compiler
90 minute video presentation from Marc Feeley, along with accompanying PowerPoint slides and source code, for a Scheme to C compiler. Good discussion of continuations and closures, as well as some dipping into the area of compiler construction.
I didn’t work through this but it looks like it might be a fun project to undertake (I’ll add it to the list).
(via LtU)
Advice on writing teachpacks
Here is some advice on writing teachpacks for PLT’s DrScheme.
About teachpacks:
Teaching languages are small subsets of a full programming language. While such restrictions simplify error diagnosis and the construction of tools, they also make it impossible (or at least difficult) to write some interesting programs. To circumvent this restriction, it is possible to import teachpacks into programs written in a teaching language.
In principle, a teachpack is just a library written in the full language, not the teaching subset. Like any other library, it may export values, functions, etc. In contrast to an ordinary library, however, a teachpack must enforce the contracts of the “lowest” teaching language into which it is imported and signal errors in a way with which students are familiar at that level.
Typed Scheme
Typed Scheme is a typed dialect of PLT Scheme. It integrates with modules written in other PLT dialects, and provides a type system designed to support common Scheme idioms.
Typed Scheme is a pretty neat language because it can can both use and be used by (untyped) Scheme code in PLT Scheme.
Interactive debugging utility for PLT Scheme
Eli released a library to facilitate interactive debugging in PLT Scheme.
ADDENDUM:11/15/11
Corrected the linked file name.
Soft real-time Scheme implementations
Check out this list of soft real-time Scheme implementations!
ypsilon
ypsilon is the implementation of Scheme Programming Language, which conforms to the latest standard R6RS. It achieves a remarkably short GC pause time and the best performance in parallel execution as it implements “mostly concurrent garbage collection”, which is optimized for the multi-core CPU system.
If you are wondering “Why yet another Scheme implementation” you can find the answer here. To sum it up: they require real-time processing speed and can not use Boehm Garbage Collector because they run on arcade consoles or pinball machines, so, they had to start from scratch.
Addendum: 8/2/8
Ypsilon 0.9.6 is the bug fix release. It fixes all bugs reported and found in version 0.9.5. Ypsilon 0.9.6 has passed all 8886 tests in PLT R6RS test suite revision 11016.
(via C.L.S.)