From f61026119df4700f69eb73e95620bc5928ca0fcb Mon Sep 17 00:00:00 2001 From: User Date: Tue, 13 Oct 2009 02:52:09 +0000 Subject: Grand rename for gitit transfer --- software/scheme.page | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 software/scheme.page (limited to 'software/scheme.page') diff --git a/software/scheme.page b/software/scheme.page new file mode 100644 index 0000000..dda68f1 --- /dev/null +++ b/software/scheme.page @@ -0,0 +1,85 @@ +================== +Scheme +================== + +``mit-scheme`` with the ``scmutils`` package is assumed; the command +``mechanics`` starts in interactive edwin prompt. + +See also notes on `The Little Schemer `__. + +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 `__. + +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 `__ + +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. -- cgit v1.2.3