li evaulates Scheme (Lisp) expressions.

go get github.com/kvu787/li

li [-h | -i]

If no flags are specified, expressions are read from standard input and evaluated. The value of the final expression is printed to standard output.

The -i flag launches an interactive read-evaluate-print-loop (REPL) interpreter. Expressions are read from standard input. The result of each expression is printed to standard output until EOF is encountered or an error occurs.

The examples directory contains several Scheme programs that li can evaulate. You can evaluate a term of the Fibonacci sequence by piping fib.scm into li:

li < examples/fib.scm
233

li runs in interactive mode when given the -i option. Below is the transcript of a sample session that evaluates Fibonacci terms:

$ li -i
(define fib (lambda (n)
  (cond ((= n 0) 0)
        ((= n 1) 1)
        (else (+ (fib (- n 1)) (fib (- n 2)))))))
>>> <nil>
(fib 0)
>>> 0
(fib 2)
>>> 1
(fib 10)
>>> 55
(fib 6)
>>> 8