=================[ Readings on Scheme ]=================

In the textbook, Scheme is called a dialect of LISP; others would call
it a separate language. Scheme was meant to focus on the features of
LISP that were most interesting such as lexical scoping; clean up
unnecessary complexity, such as separate symbol-value and
symbol-function and the related "funcall" cruft for calling lambdas; and to
make the syntax more uniform, by uniformly ending predicates with ?, functions
and special forms with side effects with !, etc.
For example: atom?, null?, set!, car!, and cdr! instead of LISP's
              atom, null, setq, rplaca, rplacd.

Scheme became the language for testing new programming language and
compiler research ideas. Being of a LISP descent, it had minimal
syntax and could be redefined and extended at will, while still having
its programs at the same time as its most fundamental data structure
(a list). As a cleaner LISP, it was compact and rid of some of LISP's
legacy baggage.

----------------[ From Lisp to Scheme code ]----------------

For brief but informative translations between Scheme and Lisp see
the end of textbook's section 3.3. Figure 20.1 in Chapter 20 of OnLisp
is more comprehensive.

Chapter 20 talks of "continuations", which became another core PL concept after
closures and lexical scoping newly introduced in Scheme.

MacPorts has several Scheme implementations: chez-scheme, scheme48, mit-scheme, etc.
I am using chez-scheme currently, installed via  "port install chez-scheme".

I tried installing racket and mit-scheme through MacPorts but ran into various issues.

See https://wingolog.org/archives/2013/01/07/an-opinionated-guide-to-scheme-implementations
if you are interested in exploring; Racket has a GUI and an IDE if you like these.
Otherwise, use any command-line Scheme with "rlwrap" ("port install rlwrap").

=====================[ Running Scheme in Emacs ]====================

First and foremost, you can run chez-scheme just from command line. It gets you
nice Readline keybindings by default, so you don't even need rlwrap.

The simplest way of running Scheme in Emacs is
  https://www-users.cse.umn.edu/~gini/1901-07s/emacs_scheme/ 

What I did in class was slightly more complicated: I installed the Geiser package
for my Emacs 29 and then used it as a wrapper for chez-scheme. I did this with two
commands:
            M-x package-install RET geiser-chez RET
and
            M-x geiser      (Recall that M-<key> is ESC-<key> by default),

as per https://www.nongnu.org/geiser/Installation.html#DOCF1
and    https://www.nongnu.org/geiser/The-REPL.html#The-REPL

The most important keybinding for me is M-p (Esc-p).