add koto bindings

Cargo.toml

@@ -1,5 +1,7 @@
 [workspace]
 members = [
+  "bindlang",
+  "lang_bindings",
   "gen",
   "core",
   "synth",

bindlang/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "bindlang"
+version = "0.1.0"
+edition = "2018"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = { version = "1.0", features = ["extra-traits", "full", "fold", "parsing", "proc-macro"] }
+quote = "1.0"
+koto = { git = "https://github.com/llogiq/koto", branch = "vtable" }
+koto_runtime = { git = "https://github.com/llogiq/koto", branch = "vtable" }
+lang_bindings = { path = "../lang_bindings" }
+lazy_static = "1.4.0"

bindlang/examples/ex.rs

@@ -0,0 +1,42 @@
+use bindlang::{bindlang, bindlang_main};
+use std::fmt::{Display, Formatter, Result as FmtResult};
+
+#[bindlang]
+pub fn bound(_b: bool, _i: i64, _f: f32, _u: u8) {
+    // nothing to see here
+}
+
+#[bindlang]
+pub fn anotherone() {
+    // still nothing
+}
+
+#[bindlang]
+#[derive(Clone, Debug, Default)]
+pub struct MyType;
+
+//#[bindlang]
+impl Display for MyType {
+    fn fmt(&self, f: &mut Formatter) -> FmtResult {
+        write!(f, "{:?}", self)
+    }
+}
+
+#[bindlang]
+impl MyType {
+    pub fn new() -> Self { MyType }
+
+    pub fn answer(&self) -> usize {
+        42
+    }
+}
+
+bindlang_main!();
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut koto = koto::Koto::default();
+    bindlang_init(&mut koto.prelude());
+    koto.compile("import MyType\nMyType.new().answer()")?;
+    println!("{}", koto.run()?);
+    Ok(())
+}