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MOROS Lisp

A minimalist Lisp interpreter is available in MOROS to extend the capabilities of the Shell.

It started from [Risp][https://github.com/stopachka/risp] and was extended to include the seven primitive operators and the two special forms of John McCarthy's paper "Recursive Functions of Symbolic Expressions and Their Computation by Machine" (1960) and "The Roots of Lisp" (2002) by Paul Graham.

MOROS Lisp dialect is also inspired by Scheme and Clojure.

Seven Primitive Operators

quote (with the ' syntax)
atom (aliased to atom?)
eq (aliased to eq?)
car (aliased to first)
cdr (aliased to rest)
cons
cond

Two Special Forms

label (aliased to def)
lambda (aliased to fn)

Additional primitives

defun (aliased to defn)
print

Usage

The interpreter can be invoked from the shell:

> lisp
MOROS Lisp v0.1.0

> (+ 1 2)
3

> (exit)

And it can execute a file.

For example a file located in /tmp/fib.ls with the following content:

(label fib
  (lambda (n)
    (cond
      ((< n 2) n)
      (true (+ (fib (- n 1)) (fib (- n 2)))))))

(print (fib 6))

Would produce the following output:

> lisp /tmp/fib.ls
8

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