Merge branch 'master' into compiler

22 files changed, 402 insertions, 42 deletions

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..4a4726a
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use_nix
diff --git a/.vscode/launch.json b/.vscode/launch.json
deleted file mode 100644
index 961f091..0000000
--- a/.vscode/launch.json
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-  "version": "0.1.0",
-  "configurations": [
-    {
-      "name": "Run Extension",
-      "type": "extensionHost",
-      "request": "launch",
-      "runtimeExecutable": "${execPath}",
-      "args": ["--extensionDevelopmentPath=${workspaceRoot}/ext"]
-    }
-  ]
-}
diff --git a/Cargo.lock b/Cargo.lock
index 23e77c7..908146c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -42,9 +42,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.141"
+version = "0.2.142"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3304a64d199bb964be99741b7a14d26972741915b3649639149b2479bb46f4b5"
+checksum = "6a987beff54b60ffa6d51982e1aa1146bc42f19bd26be28b0586f252fccf5317"
 
 [[package]]
 name = "once_cell"
@@ -111,12 +111,17 @@ name = "sloth"
 version = "0.1.0"
 dependencies = [
  "itertools",
+ "libc",
  "sloth_bytecode",
  "sloth_vm",
  "thiserror",
 ]
 
 [[package]]
+name = "sloth_asm"
+version = "0.1.0"
+
+[[package]]
 name = "sloth_bytecode"
 version = "0.1.0"
 dependencies = [
diff --git a/Cargo.toml b/Cargo.toml
index 57e0bc4..118519e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [workspace]
 members = [
     "crates/sloth",
+    "crates/sloth_asm",
     "crates/sloth_bytecode",
     "crates/sloth_vm",
 ]
diff --git a/README.md b/README.md
index 5507c5b..b7793f3 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # Sloth - Blazingly Slow™
-Sloth is an interpreted high level language written in Rust. The syntax is meant to be close to Python but with sprinkles of Rust.
+Sloth is an interpreted high level language written in Rust.
 
 ## Build
 To build sloth is easy, just run `cargo build` and you will have your own version of sloth!
diff --git a/crates/sloth/Cargo.toml b/crates/sloth/Cargo.toml
index 9ab22e1..8f49802 100644
--- a/crates/sloth/Cargo.toml
+++ b/crates/sloth/Cargo.toml
@@ -10,4 +10,5 @@ sloth_vm = { path = "../sloth_vm" }
 sloth_bytecode = { path = "../sloth_bytecode" }
 
 itertools = "0.10.5"
+libc = "0.2.142"
 thiserror = "1.0.40"
diff --git a/crates/sloth/src/parser/ast.rs b/crates/sloth/src/parser/ast.rs
index 2da1512..543ea3a 100644
--- a/crates/sloth/src/parser/ast.rs
+++ b/crates/sloth/src/parser/ast.rs
@@ -24,6 +24,7 @@ pub enum BinaryOp {
     LogOr,
     Range,
 }
+
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum UnaryOp {
     Not,
@@ -31,6 +32,7 @@ pub enum UnaryOp {
 
     BWComp,
 }
+
 #[derive(Debug, Clone, PartialEq)]
 pub enum Literal {
     Integer(i128),
@@ -41,6 +43,7 @@ pub enum Literal {
     Regex(String),
     List(Vec<Expr>),
 }
+
 #[derive(Debug, Clone, PartialEq)]
 pub enum Expr {
     Grouping(Box<Expr>),
@@ -61,11 +64,13 @@ pub enum Expr {
     Literal(Literal),
     Lambda, // TODO: Lambda
 }
+
 #[derive(PartialEq, Clone, Debug)]
 pub struct FuncArgs {
     pub name: String,
     pub typ: Option<String>,
 }
+
 #[derive(PartialEq, Clone, Debug)]
 pub enum Stmt {
     ExprStmt(Expr),
diff --git a/crates/sloth/src/parser/expr.rs b/crates/sloth/src/parser/expr.rs
index 62c7893..9e81f7f 100644
--- a/crates/sloth/src/parser/expr.rs
+++ b/crates/sloth/src/parser/expr.rs
@@ -150,7 +150,7 @@ impl<'a> AstParser<'a> {
     // Binary expressions in order of precedence from lowest to highest.
     binary_expr!(logical_or      , logical_and     , (TokenType::PipePipe));
     binary_expr!(logical_and     , range           , (TokenType::AmpAmp));
-    binary_expr!(range           , equality         , (TokenType::DotDot));
+    binary_expr!(range           , equality        , (TokenType::DotDot));
     binary_expr!(equality        , comparison      , (TokenType::BangEq | TokenType::EqEq));
     binary_expr!(comparison      , bitwise_shifting, (TokenType::Lt     | TokenType::Gt    | TokenType::LtEq | TokenType::GtEq));
     binary_expr!(bitwise_shifting, additive        , (TokenType::LtLt   | TokenType::GtGt));
diff --git a/crates/sloth/src/parser/stmt.rs b/crates/sloth/src/parser/stmt.rs
index 6f53119..1a961b1 100644
--- a/crates/sloth/src/parser/stmt.rs
+++ b/crates/sloth/src/parser/stmt.rs
@@ -325,7 +325,7 @@ mod tests {
 
     #[test]
     fn basic_statement_a() {
-        let lexer = Lexer::new("var test_a = 5 + 3;");
+        let lexer = Lexer::new("var test_a: int = 5 + 3;");
         let tokens = lexer.collect_vec();
 
         let expected_ast = Stmt::DefineVariable {
@@ -335,7 +335,7 @@ mod tests {
                 lhs: (Box::new(Expr::Literal(Literal::Integer(5)))),
                 rhs: (Box::new(Expr::Literal(Literal::Integer(3)))),
             }),
-            typ: (None),
+            typ: Some("int".to_string()),
         };
 
         let mut parser = AstParser::new(tokens);
diff --git a/crates/sloth_asm/Cargo.toml b/crates/sloth_asm/Cargo.toml
new file mode 100644
index 0000000..b3ae934
--- /dev/null
+++ b/crates/sloth_asm/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "sloth_asm"
+
+license.workspace = true
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
diff --git a/crates/sloth_asm/src/lib.rs b/crates/sloth_asm/src/lib.rs
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/crates/sloth_asm/src/lib.rs
@@ -0,0 +1 @@
+
diff --git a/crates/sloth_vm/src/native.rs b/crates/sloth_vm/src/native.rs
index 8790cbd..fbd2626 100644
--- a/crates/sloth_vm/src/native.rs
+++ b/crates/sloth_vm/src/native.rs
@@ -15,4 +15,5 @@ pub struct NativeFunction {
     pub function: NativeFunctionInput,
     pub arity: u8,
     pub returns_value: bool,
+    pub doc: Option<&'static str>,
 }
diff --git a/crates/sloth_vm/src/sloth_std/file.rs b/crates/sloth_vm/src/sloth_std/file.rs
new file mode 100644
index 0000000..b0b476a
--- /dev/null
+++ b/crates/sloth_vm/src/sloth_std/file.rs
@@ -0,0 +1,83 @@
+use std::fs;
+
+use crate::native::{self, NativeFunction, NativeFunctionResult};
+use crate::value::{Object, ObjectType, Primitive};
+use crate::VM;
+
+fn file_read(vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
+    let Some(Primitive::Object(ptr)) = args.get(0).cloned() else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let object = vm
+        .objects()
+        .get(ptr as usize)
+        .ok_or(native::Error::InvalidArgument)?;
+
+    let ObjectType::String(str) = &object.typ else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let contents = fs::read_to_string(str).expect("IO Error: Failed to read file!");
+
+    let object = Object::new(ObjectType::String(contents));
+    let ptr = vm.objects_mut().allocate(object);
+
+    Ok(Primitive::Object(ptr as u32))
+}
+
+pub const FILE_READ: NativeFunction = NativeFunction {
+    name: "file$read",
+    function: file_read,
+    arity: 1,
+    returns_value: true,
+    doc: Some(
+        "NativeFunction file$read: \n\targs: path (str)\n\tdesc: Returns the contents of a file \
+         at <path>\n\tExample: `var todo = file$read('/home/sloth/todo.txt'); # Assuming the \
+         contents of todo.txt are 'Take a nap' then todo = 'Take a nap'`",
+    ),
+};
+
+fn file_write(vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
+    let Some(Primitive::Object(path_ptr)) = args.get(0).cloned() else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let path_object = vm
+        .objects()
+        .get(path_ptr as usize)
+        .ok_or(native::Error::InvalidArgument)?;
+
+    let ObjectType::String(path) = &path_object.typ else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let Some(Primitive::Object(content_ptr)) = args.get(1).cloned() else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let content_object = vm
+        .objects()
+        .get(content_ptr as usize)
+        .ok_or(native::Error::InvalidArgument)?;
+
+    let ObjectType::String(content) = &content_object.typ else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let _ = fs::write(path, content);
+
+    Ok(Primitive::Empty)
+}
+
+pub const FILE_WRITE: NativeFunction = NativeFunction {
+    name: "file$write",
+    function: file_write,
+    arity: 2,
+    returns_value: false,
+    doc: Some(
+        "NativeFunction file$write: \n\targs: path (str), content (str)\n\tdesc: Writes <content> \
+         to file at <path>\n\tExample: `file$write('/home/sloth/todo.txt', 'Take a nap'); # \
+         todo.txt now contains the string 'Take a nap'`",
+    ),
+};
diff --git a/crates/sloth_vm/src/sloth_std/misc.rs b/crates/sloth_vm/src/sloth_std/misc.rs
new file mode 100644
index 0000000..ca08d1d
--- /dev/null
+++ b/crates/sloth_vm/src/sloth_std/misc.rs
@@ -0,0 +1,39 @@
+use crate::native::{self, NativeFunction, NativeFunctionResult};
+use crate::value::{Object, ObjectType, Primitive};
+use crate::VM;
+
+fn get_doc(vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
+    let Some(Primitive::Object(ptr)) = args.get(0).cloned() else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let object = vm
+        .objects()
+        .get(ptr as usize)
+        .ok_or(native::Error::InvalidArgument)?;
+
+    let ObjectType::NativeFunction(fnc) = &object.typ else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let docs = fnc
+        .doc
+        .expect("Oopsie Poopsie the stringy no worky")
+        .to_string();
+    let object = Object::new(ObjectType::String(docs));
+    let ptr = vm.objects_mut().allocate(object);
+
+    Ok(Primitive::Object(ptr as u32))
+}
+
+pub const DOCS: NativeFunction = NativeFunction {
+    name: "docs",
+    function: get_doc,
+    arity: 1,
+    returns_value: true,
+    doc: Some(
+        "NativeFunction docs: \n\targs: name (str)\n\tdesc: Returns documentaiton on a function \
+         with name <str>\n\tExample: `var doc = docs('wait'); # Returns the documentation of the \
+         'wait' function to doc`",
+    ),
+};
diff --git a/crates/sloth_vm/src/sloth_std/mod.rs b/crates/sloth_vm/src/sloth_std/mod.rs
index 86611d7..ff761a6 100644
--- a/crates/sloth_vm/src/sloth_std/mod.rs
+++ b/crates/sloth_vm/src/sloth_std/mod.rs
@@ -4,8 +4,12 @@ use once_cell::sync::Lazy;
 
 use crate::native::NativeFunction;
 
+pub mod file;
+pub mod misc;
 pub mod rand;
 pub mod stdio;
+pub mod term;
+pub mod time;
 
 pub static NATIVE_LIBRARY: Lazy<HashMap<&'static str, NativeFunction>> = Lazy::new(|| {
     let mut map = HashMap::new();
@@ -16,9 +20,24 @@ pub static NATIVE_LIBRARY: Lazy<HashMap<&'static str, NativeFunction>> = Lazy::n
 
     // stdio
     map.insert("write", stdio::WRITE_FUNCTION);
+    map.insert("writeln", stdio::WRITELN_FUNCTION);
     map.insert("read", stdio::READ_FUNCTION);
 
+    // term
+    map.insert("term$clear", term::TERM_CLEAR);
+    map.insert("term$setpos", term::TERM_SETPOS);
+
     // filesystem
+    // TODO: Make the files commands work by making a global file variable with
+    // certain permissions created by 'file.open' instead of just reading the file.
+    map.insert("file$read", file::FILE_READ);
+    map.insert("file$write", file::FILE_WRITE);
+
+    // time
+    map.insert("wait", time::WAIT);
+
+    // doc
+    map.insert("docs", misc::DOCS);
 
     map
 });
diff --git a/crates/sloth_vm/src/sloth_std/rand.rs b/crates/sloth_vm/src/sloth_std/rand.rs
index bae0606..870cca1 100644
--- a/crates/sloth_vm/src/sloth_std/rand.rs
+++ b/crates/sloth_vm/src/sloth_std/rand.rs
@@ -16,6 +16,10 @@ pub const GEN_FUNCTION: NativeFunction = NativeFunction {
     function: gen,
     arity: 0,
     returns_value: true,
+    doc: Some(
+        "NativeFunction rand$gen:\n\tdesc: Returns a random number in the range `0.0 .. \
+         1.0`\n\tExample: `var num = rand$gen(); # num could be any number from 0.0 to 1.0`",
+    ),
 };
 
 fn gen_range(_vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
@@ -36,4 +40,9 @@ pub const GEN_RANGE_FUNCTION: NativeFunction = NativeFunction {
     function: gen_range,
     arity: 2,
     returns_value: true,
+    doc: Some(
+        "NativeFunction rand$gen_range: \n\targs: min (int), max (int)\n\tdesc: Returns a random \
+         numnber in the range <min> .. <max>\n\tExample: `var num = rand$gen_range(20, 76); # num \
+         could be any number from 20 to 76`",
+    ),
 };
diff --git a/crates/sloth_vm/src/sloth_std/stdio.rs b/crates/sloth_vm/src/sloth_std/stdio.rs
index a743ad1..f56b604 100644
--- a/crates/sloth_vm/src/sloth_std/stdio.rs
+++ b/crates/sloth_vm/src/sloth_std/stdio.rs
@@ -18,7 +18,7 @@ fn write(vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
         return Err(native::Error::InvalidArgument);
     };
 
-    println!("{str}");
+    print!("{str}");
 
     Ok(Primitive::Empty)
 }
@@ -28,6 +28,41 @@ pub const WRITE_FUNCTION: NativeFunction = NativeFunction {
     function: write,
     arity: 1,
     returns_value: false,
+    doc: Some(
+        "NativeFunction write: \n\targs: string (str)\n\tdesc: Writes <string> to the \
+         terminal.\n\tExample: `write(\"I'm sleepy...\"); # Output: I'm sleepy...`",
+    ),
+};
+
+fn writeln(vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
+    let Some(Primitive::Object(ptr)) = args.get(0).cloned() else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    let object = vm
+        .objects()
+        .get(ptr as usize)
+        .ok_or(native::Error::InvalidArgument)?;
+
+    let ObjectType::String(str) = &object.typ else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    println!("{str}");
+
+    Ok(Primitive::Empty)
+}
+
+pub const WRITELN_FUNCTION: NativeFunction = NativeFunction {
+    name: "writeln",
+    function: writeln,
+    arity: 1,
+    returns_value: false,
+    doc: Some(
+        "NativeFunction writeln: \n\targs: string (str)\n\tdesc: Writes <string> to the terminal \
+         and starts a new line.\n\tExample: `writeln(\"I'm sleepy...\"); # Output: I'm \
+         sleepy...\n # This is a new line`",
+    ),
 };
 
 fn read(vm: &mut VM, _args: &[Primitive]) -> NativeFunctionResult {
@@ -48,4 +83,9 @@ pub const READ_FUNCTION: NativeFunction = NativeFunction {
     function: read,
     arity: 0,
     returns_value: true,
+    doc: Some(
+        "NativeFunction read:\n\tdesc: Reads input from the terminal and returns what was \
+         read.\n\tExample: `var input = read(); # Hello World <execute code> input = 'Hello \
+         World'`",
+    ),
 };
diff --git a/crates/sloth_vm/src/sloth_std/term.rs b/crates/sloth_vm/src/sloth_std/term.rs
new file mode 100644
index 0000000..f61321c
--- /dev/null
+++ b/crates/sloth_vm/src/sloth_std/term.rs
@@ -0,0 +1,41 @@
+use crate::native::{self, NativeFunction, NativeFunctionResult};
+use crate::value::Primitive;
+use crate::value::Primitive::Integer;
+use crate::VM;
+
+pub const TERM_CLEAR: NativeFunction = NativeFunction {
+    name: "term$clear",
+    function: |_vm, _args| {
+        print!("\x1b[2J\x1b[H");
+        Ok(Primitive::Empty)
+    },
+    arity: 0,
+    returns_value: false,
+    doc: Some(
+        "NativeFunction term$clear: \n\tdesc: Clears the terminal\n\tExample: `term$clear(); # \
+         Clears the terminal`",
+    ),
+};
+
+fn term_setpos(_vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
+    let x = args.get(0).cloned();
+    let y = args.get(1).cloned();
+
+    let (Some(Integer(x)), Some(Integer(y))) = (x, y) else {
+        return Err(native::Error::InvalidArgument);
+    };
+    print!("\x1b[{x};{y}H");
+    Ok(Primitive::Empty)
+}
+
+pub const TERM_SETPOS: NativeFunction = NativeFunction {
+    name: "term$setpos",
+    function: term_setpos,
+    arity: 2,
+    returns_value: false,
+    doc: Some(
+        "NativeFunction term$setpos: \n\targs: x (int), y (int)\n\tdesc: Sets the cursors \
+         position to (<x>, <y>)\n\tExample: `term$setpos(5, 17); # Sets the position of the \
+         cursor to (5, 17)`",
+    ),
+};
diff --git a/crates/sloth_vm/src/sloth_std/time.rs b/crates/sloth_vm/src/sloth_std/time.rs
new file mode 100644
index 0000000..b27e0b5
--- /dev/null
+++ b/crates/sloth_vm/src/sloth_std/time.rs
@@ -0,0 +1,29 @@
+use std::{thread, time};
+
+use crate::native::{self, NativeFunction, NativeFunctionResult};
+use crate::value::Primitive;
+use crate::value::Primitive::Integer;
+use crate::VM;
+
+fn wait(_vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
+    let sec = args.get(0).cloned();
+
+    let Some(Integer(sec)) = sec else {
+        return Err(native::Error::InvalidArgument);
+    };
+
+    thread::sleep(time::Duration::from_secs(sec.try_into().unwrap()));
+
+    Ok(Primitive::Empty)
+}
+
+pub const WAIT: NativeFunction = NativeFunction {
+    name: "wait",
+    function: wait,
+    arity: 1,
+    returns_value: false,
+    doc: Some(
+        "NativeFunction wait: \n\targs: sec (int)\n\tdesc: Waits for <sec> seconds.\n\tExample: \
+         `wait(10); # Waits 10 seconds`",
+    ),
+};
diff --git a/examples/mandelbrot.sloth b/examples/mandelbrot.sloth
new file mode 100644
index 0000000..bc95e2f
--- /dev/null
+++ b/examples/mandelbrot.sloth
@@ -0,0 +1,24 @@
+val size: int = 200;
+val maxVal: float = 4.0;
+val maxIter: int = 50;
+val plane: float = 4.0;
+
+for x in 0 .. size {
+    for y in 0 .. size {
+        var cReal: float = (x * plane / size) - 2;
+        var cImg: float = (y * plane / size) - 2;
+        var zReal: float = 0;
+        var zImg: float = 0;
+        var count: float = 0;
+        while (zReal * zReal + zImg * zImg) <= maxVal && count < 4{
+            var temp: float = (zReal * zReal) - (zImg * zImg) + cReal;
+            zImg = 2 * zReal * zImg + cImg;
+            zReal = temp;
+            count += 1;
+        }
+        if count == maxIter {
+            term_setpos(x, y);
+            print("*");
+        }
+    }
+}
diff --git a/examples/snake.sloth b/examples/snake.sloth
new file mode 100644
index 0000000..c60819d
--- /dev/null
+++ b/examples/snake.sloth
@@ -0,0 +1,40 @@
+var xPos = 0;
+var yPos = 0;
+# 0=right 1=down 2=left 3=up
+var direction = 0;
+
+while true {
+    if direction == 0{
+        var x = xPos + 1;
+        xPos = x;
+    }
+    if direction == 1 {
+        var y = yPos + 1;
+        yPos = y;
+    }
+    if direction == 2{
+        var x = xPos - 1;
+        xPos = x;
+    }
+    if direction == 3 {
+        var y = yPos - 1;
+        yPos = y;
+    }
+
+    var input = readln();
+    if input == "w" && direction != 1 {
+      direction = 3;
+    }
+    if input == "a" && direction != 0 {
+      direction = 2;
+    }
+    if input == "s" && direction != 3 {
+      direction = 1;
+    }
+    if input == "d" && direction != 2 {
+      direction = 0;
+    }
+
+    term_setpos(x, y);
+    print("*");
+}
diff --git a/flake.nix b/flake.nix
index 77fc725..4223f11 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,4 +1,6 @@
 {
+  description = "slothlang";
+
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/master";
     flake-utils.url = "github:numtide/flake-utils";
@@ -10,29 +12,52 @@
   };
 
   outputs = { self, nixpkgs, flake-utils, rust-overlay, ... }:
-  flake-utils.lib.eachSystem
-    [ "x86_64-linux" ]
-    (system:
-    let
-      overlays = [ (import rust-overlay) ];
-      pkgs = import nixpkgs {
-        inherit system overlays;
-      };
-    in 
-    rec
-    {
-      devShell = pkgs.mkShell rec {
-        buildInputs = with pkgs; [
-          (rust-bin.nightly."2023-02-10".default.override {
-            extensions = [ "rust-src" "rust-analyzer" ];
-            targets = [ "wasm32-unknown-unknown" ];
-          })
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+
+        rustStable = pkgs.rust-bin.stable.latest.default;
+        rustNightly = pkgs.rust-bin.nightly."2023-02-10".default;
+
+        rustPlatform = pkgs.makeRustPlatform {
+          cargo = rustStable;
+          rustc = rustStable;
+        };
+      in
+      with pkgs;
+      {
+        packages.default = rustPlatform.buildRustPackage rec {
+          pname = "sloth";
+          version = "0.1.0";
+          src = ./.;
+
+          # FIXME: Tests do not run in release mode
+          checkType = "debug";
+          cargoLock = {
+            lockFile = ./Cargo.lock;
+          };
 
-          cargo-deny
-          cargo-release
-        ];
+          meta = with lib; {
+            description = "The Sloth programming language";
+            homepage = "https://slothlang.tech";
+            license = with licenses; [ mit asl20 ];
+          };
+        };
+        devShells.default = mkShell {
+          buildInputs = [
+            (rustNightly.override {
+              extensions = [ "rust-src" "rust-analyzer" ];
+              targets = [ "wasm32-unknown-unknown" ];
+            })
 
-        LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
-      };
-    });
+            cargo-watch
+            cargo-deny
+            cargo-release
+          ];
+        };
+      }
+    );
 }