Pie

Pie

Where even is yours to define.

Open the playground Read the docs

What makes it Pie?

Pie keeps the core tiny and hands you the parts other languages hide.
Four ideas shape everything else.

No operators until you make them

Pie doesn't come with +, == or even if. You write them as ordinary functions: prefix, infix, suffix, wrapped around a value like | x |, or spread across a sentence like if a then b else c.

You pick the precedence and the overloads, too.

Try it 
infix + = (a, b) => __builtin_add(a, b);
infix * = (a, b) => __builtin_mul(a, b);
exfix | : | = (x) => __builtin_abs(x);

__builtin_print(1 + 2 * 3);
__builtin_print(| __builtin_neg(7) |);
7 7

Everything is an expression

Blocks, loops, matches and assignments all produce a value, so they go anywhere a value can. There's no return, no statements and no null.

Try it 
print = __builtin_print;

slices = (n) => match n {
    = 1 => "one slice";
    _   => "{n} slices";
};
print(slices(8));

answer = { a = 40; b = 2; __builtin_add(a, b); };
print(answer);
8 slices 42

Assign to anything

The left side of = can be any expression. Teach Pie that 2 + 2 is 5 and it will remember, until the end of the block.

Try it 
infix + = (a, b) => __builtin_add(a, b);

2 + 2 = 5;
__builtin_print(2 + 2);

"pie" = "cake";
__builtin_print("pie");
5 cake

Types are values

Store types in variables, pass them to functions, and use plain values as types. Any function that returns a Bool can be a type, too.

Try it 
Size = union { "small"; "large"; };
order: Size = "large";

Even = (n: Int) => __builtin_eq(__builtin_mod(n, 2), 0);
slices: Even = 8;

__builtin_print(order, slices);
large 8

Get a piece of the Pie!

Grab a build for Linux or macOS from the releases page, or build from source:

  1. Download

    Clone the source code:

    git clone https://github.com/AliAlmutawaJr/Pie
cd Pie && mkdir build && cd build
cmake .. && make

  2. Write a file

    Save this as hello.pie: 

    
__builtin_print("Hello, Pie!");

  3. Run it

    Invoke the Pie executable:

    $ ./Pie hello.pie
Hello, Pie!