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-==================
-Scheme
-==================
-
-``mit-scheme`` with the ``scmutils`` package is assumed; the command
-``mechanics`` starts in interactive edwin prompt.
-
-See also notes on `The Little Schemer </k/books/littleschemer/>`__.
-
-Scheme Implementations
------------------------
-Very partial list, mostly just the ones which are interesting to me.
-Alexey Radul maintains a nice table of R5RS implementation details in various
-packages on his `website <http://web.mit.edu/~axch/www/scheme/choices.html>`__.
-
-MIT/GNU Scheme
- The 7.9.0 release (last stable as of 01/01/2009) is not R5RS compatible,
- and is generally a pain in the ass to compile on new systems. The 9.0
- release should be easier to compile and distribute because it will use
- a C compiler to bootstrap (true?).
-
-SCM
- SCM is a fairly minimal, very small footprint R5RS-compatible
- implementation. Apparently very portable and easy to compile. Includes
- the Hobbit compiler. Part of the GNU project, maintained at MIT?
-
-SIOD
- SIOD (scheme in one day) is a super small (75k binary?) Scheme
- implementation.
-
-Coding in ``edwin``
------------------------
-
-..note: this section should be spun off as emacs. edwin is essentially a
- scheme version of emacs. See this
- `emacs cheatsheet <http://static.bnewbold.net/mirror/sheets/emacs.pdf>`__
-
-Common keyboard commands (usually 'M' is alt button, 'C' is ctrl, and 'S' is
-meta/super/"windows"):
-
-========= ====================================================================
-C-x C-f Open a file, or create a new one
-C-x C-s Save the file
-C-x k Kill (close) a buffer
-C-x C-c Exit the editor
-C-g Abort a command
-C-x C-e Evaluate the previous expression
-M-z Evaluate the surrounding expression
-M-o Evaluate the entire buffer (everything)
-C-c C-c Kill evaluation after an error
-C-y Paste (yank)
-C-x 2 Split screen vertically
-C-x 5 Split screen horizontally
-C-x o Switch to next buffer window
-C-x 1 Return to non-split screen
-M-x Enter a command by name in minibuffer (use tab to complete)
-C-x C-b Show buffer menu
-C-x b Select buffer
-C-x u Undo
-C-y Paste
-========= ====================================================================
-
-Command in ``.edwin`` to set Super-TAB to autocomplete scheme variables::
-
- (define-key 'Scheme #\s-tab 'scheme-complete-variable)
-
-Scope
---------------
-``set!`` looks up a symbol name and permanently changes the first value it comes
-across. ``let`` (and ``letrec``) create a new symbol with the given value.
-But wait, you need a ``lambda`` block to make everything work?
-
-Environment/Interpreter Commands
------------------------------------
-``(disk-save filename)`` will save a binary microcode image; an existing
-image can be specified with the ``--band`` option at runtime or with
-``(disk-restore filename)`` from within the interpreter. Bands are also called
-worlds.
-
-"First Class"
-------------------
-"Procedures as first class objects" is one of the features commonly attributed
-to scheme. What does that mean? SICP describes first class objects as those
-that can be: named by variables, passed as arguments, returned as results,
-and included in data structures.