My attempt to write a minimal Lisp interpreter (in Go)

• boolean (true, nil)
• integer 64 bits
• float 64 bits
• string
• symbol

• +, -, *, /, % : arithmetic operators

• =, <, <=, >, >= : conditionals

• quote

• setq

• let

• not, or, and

• if

• while

• begin

• lambda

• eval

• list, first, last, nth, rest, find, append

• print, println, format, readlines, sleep, rand

• cmd/gisp : a REPL for gisp (can run single expressions, programs from file or expressions interactively)
• cmd/turtle : a REPL for gisp with turtle abilities (it shows how to add new types and primitives to gisp)