Lisp

Following the tutorial from Build Your Own Lisp.

Building from source

Install dependencies:

sudo apt-get install libedit-dev

Clone the source code:

git clone https://github.com/shiroyasha/lispy ~/lispy

Build binary:

cd ~/lispy
make

Run lispy:

cd ~/lispy
./lispy

Examples

Arithmetic:

> + 1 2
3

> * 1 2
2

> * (+ 1 2) (- 10 8)
6

Lists:

> { 1 2 3 }
{1 2 3}

> head {1 2 3}
1

> tail {1 2 3}
{2 3}

> join {1 2 3} {5 6 7}
{1 2 3 5 6 7}

> eval {+ 1 2}
3

Variables:

> def {a b c d} 1 90 20 87
()

> a
1

> (+ b c)
110

Functions:

> fun {add-together a b} {+ a b}
()

> add-together 32 18
50

Macros (fun fact: 'fun' is actually a macro defined in the language):

> def {fun} (\ {args body} {def (list (head args)) (\ (tail args) body)})
()

> fun {my-function a b c} {* a b c}
()

> my-function 1 2 3
6