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# Micro Programming Language
Micro is a small statically typed toy programming language.
Objectives:
* Learn and have fun
* Build an interpreter
* (may be) Build a cross-compiler targeting 8-bit microcomputers (Z80 CPU)
* Easy to interact with existing libraries written in other languages
* Fast compilation (compiler) / start-up time (interpreter)
* Micro should be statically typed, small but useful, and reasonably performant (including on the target CPU)
## Current status
There is a tree-walk interpreter built in Go mostly following the most excellent [Crafting Interpreters](https://craftinginterpreters.com/) book. It isn't fast, but it can be useful to test code and play around.
A compiler targeting the Z80 CPU was planned, and that is influencing what is available on the interpreter. Unfortunately this has proven to be more than I can currently tackle, so I'm releasing the interpreter "as is".
There's a plugin to provide syntax highlighting in vim. The proposed extension for Micro source code is `.micro` or `.cro`.
## How to build
Micro requires Go 1.18 (or later) can be built with:
```
$ git clone https://git.usebox.net/micro-lang
$ cd micro-lang
$ make
```
`micro` binary should be in `./bin` directory ready to use.
You can also [browse the code via web](https://git.usebox.net/micro-lang.git/about/).
### Running the interpreter
Run a script with `micro file.micro`, or start the REPL with `micro`:
```
Welcome to Micro <VERSION>
Type in expressions for evaluation, or :q to exit.
micro> println("Hello micro!");
Hello micro!
13
micro> :q
```
Also run `micro -h` for the CLI help.
An example of a program:
```micro
def fib(n number) number {
if n < 2 {
return n;
} else {
return fib(n - 1) + fib(n - 2);
}
}
println(fib(20));
// output: 6765
```
Check [the tour](docs/tour.md) for features and details about the language.
You can also read [the grammar](grammar.md).
## Copying
This software is distributed under MIT license, unless stated otherwise. See [COPYING](COPYING) file for further details.
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