quick first pass at wrapping Wren using bindgen

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Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "wren-bind"
+version = "0.1.0"
+authors = ["Getty Ritter <gettylefou@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[build-dependencies]
+bindgen = "0.50"

build.rs

@@ -0,0 +1,67 @@
+extern crate bindgen;
+
+use std::env;
+use std::path::{Path,PathBuf};
+use std::process::Command;
+
+#[allow(dead_code)]
+fn make_debug(dir: &Path) {
+    let status = Command::new("make").current_dir(dir).arg("debug").status();
+    assert!(status.unwrap().success());
+    println!("cargo:rustc-link-lib=static=wrend");
+}
+
+#[allow(dead_code)]
+fn make_release(dir: &Path) {
+    let status = Command::new("make").current_dir(dir).arg("static").status();
+    assert!(status.unwrap().success());
+    println!("cargo:rustc-link-lib=static=wren");
+}
+
+
+
+fn main() {
+    // The bindgen::Builder is the main entry point
+    // to bindgen, and lets you build up options for
+    // the resulting bindings.
+    let bindings = bindgen::Builder::default()
+        // The input header we would like to generate
+        // bindings for.
+        .header("wren/src/include/wren.h")
+    // Finish the builder and generate the bindings.
+        .whitelist_type("WrenConfiguration")
+        .whitelist_type("WrenVM")
+        .whitelist_type("WrenHandle")
+        .whitelist_function("wrenInitConfiguration")
+        .whitelist_function("wrenNewVM")
+        .whitelist_function("wrenInterpret")
+        .whitelist_function("wrenFreeVM")
+        .whitelist_function("wrenMakeCallHandle")
+        .whitelist_function("wrenEnsureSlots")
+        .whitelist_function("wrenGetVariable")
+        .whitelist_function("wrenSetSlotHandle")
+        .whitelist_function("wrenReleaseHandle")
+        .whitelist_function("wrenCall")
+        .whitelist_function("wrenSetSlotString")
+        .generate()
+        // Unwrap the Result and panic on failure.
+        .expect("Unable to generate bindings");
+
+    // Write the bindings to the $OUT_DIR/bindings.rs file.
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+
+    let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+    let manifest_path = Path::new(&manifest_dir);
+    let wren_make_dir = manifest_path.join("wren");
+    let wren_lib_dir = manifest_path.join("wren/lib");
+
+    #[cfg(debug_assertions)]
+    make_debug(&wren_make_dir);
+    #[cfg(not(debug_assertions))]
+    make_release(&wren_make_dir);
+
+    println!("cargo:rustc-link-search=native={}", wren_lib_dir.display());
+}

src/main.rs

@@ -0,0 +1,128 @@
+use std::ffi::{CString,CStr};
+use std::mem::MaybeUninit;
+
+mod wren;
+
+pub struct Config {
+    config: wren::WrenConfiguration,
+}
+
+pub struct VM {
+    vm: *mut wren::WrenVM,
+}
+
+impl Config {
+    fn init() -> Config {
+        extern "C" fn write_fn(_vm: *mut wren::WrenVM, text: *const i8) {
+            let s = unsafe { CStr::from_ptr(text) };
+            print!("{}", s.to_str().unwrap());
+        }
+
+        unsafe {
+            let mut config = MaybeUninit::uninit();
+            wren::wrenInitConfiguration(config.as_mut_ptr());
+            let mut config = config.assume_init();
+            config.writeFn = Some(write_fn);
+            Config { config: config }
+        }
+    }
+
+    fn mk_vm(&mut self) -> VM {
+        let vm = unsafe { wren::wrenNewVM(&mut self.config as *mut _) };
+        VM { vm }
+    }
+}
+
+impl VM {
+    fn interpret(&self, module: &str, code: &str) -> bool {
+        let mod_str = CString::new(module).unwrap();
+        let code_str = CString::new(code).unwrap();
+        let result = unsafe { wren::wrenInterpret(self.vm, mod_str.as_ptr(), code_str.as_ptr()) };
+        result == 0
+    }
+
+    fn ensure_slots(&self, n: i32) {
+        unsafe { wren::wrenEnsureSlots(self.vm, n) }
+    }
+
+    fn call_handle(&self, sig: &str) -> Option<Handle> {
+        unsafe {
+            let sig_str = CString::new(sig).unwrap();
+            let handle = wren::wrenMakeCallHandle(self.vm, sig_str.as_ptr());
+            if handle.is_null() {
+                None
+            } else {
+                Some(Handle { handle, vm: self })
+            }
+        }
+    }
+}
+
+impl Drop for VM {
+    fn drop(&mut self) {
+        unsafe { wren::wrenFreeVM(self.vm) }
+    }
+}
+
+struct Handle<'a> {
+    vm: &'a VM,
+    handle: *mut wren::WrenHandle,
+}
+
+impl<'t> Handle<'t> {
+    fn call(&self, args: &[&dyn WrenValue]) {
+        self.vm.ensure_slots(args.len() as i32);
+        for (i, v) in args.iter().enumerate() {
+            v.set_slot(&self.vm, i as i32);
+        }
+        unsafe {
+            wren::wrenCall(self.vm.vm, self.handle);
+        }
+    }
+}
+
+impl<'t> Drop for Handle<'t> {
+    fn drop(&mut self) {
+        unsafe { wren::wrenReleaseHandle(self.vm.vm, self.handle) }
+    }
+}
+
+fn c_str(s: &str) -> CString {
+    CString::new(s).unwrap()
+}
+
+trait WrenValue {
+    // fn get_slot(vm: &VM, slot: i32) -> Self;
+    fn set_slot(&self, vm: &VM, slot: i32);
+}
+
+impl WrenValue for String {
+    fn set_slot(&self, vm: &VM, slot: i32) {
+        unsafe {
+            wren::wrenSetSlotString(vm.vm, slot, c_str(self).as_ptr())
+        }
+    }
+}
+
+struct Var {
+    module: &'static str,
+    name: &'static str,
+}
+
+impl WrenValue for Var {
+    fn set_slot(&self, vm: &VM, slot: i32) {
+        unsafe {
+            wren::wrenGetVariable(vm.vm, c_str(self.module).as_ptr(), c_str(self.name).as_ptr(), slot);
+        }
+    }
+}
+
+fn main() {
+    let vm = Config::init().mk_vm();
+    vm.interpret("main", "class Foo { static hello(name) { System.print(\"what's up, %(name)\") } }");
+    let hello = vm.call_handle("hello(_)").unwrap();
+    hello.call(&[
+        &Var { module: "main", name: "Foo" },
+        &format!("my dog"),
+    ]);
+}

src/wren.rs

@@ -0,0 +1,5 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));

wren

@@ -0,0 +1 @@
+Subproject commit 740c365597c8d3718683bde18e8a1f104a6f8e8c