Add rust (caller) side entry point

Cargo.lock

@@ -2,6 +2,358 @@
 # It is not intended for manual editing.
 version = 3
 
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Cargo.toml

@@ -9,3 +9,6 @@ edition = "2021"
 rust-version = "1.73"
 
 [dependencies]
+
+[build-dependencies]
+bindgen = "0.69.4"

build.rs

@@ -0,0 +1,36 @@
+use std::env;
+use std::path::PathBuf;
+
+const CALLEE_NAME: &str = "Callee";
+
+fn main()
+{
+	let callee_root = env::var("CALLEE_PATH").expect("Callee path variable must be available");
+	let lean_root = env::var("LEAN_ROOT").expect("Lean root must exist");
+	println!("cargo:rustc-link-search={callee_root}");
+	println!("cargo:rustc-link-search={lean_root}/lib/lean");
+	println!("cargo:rustc-link-lib={CALLEE_NAME}");
+	//println!("cargo:rustc-link-lib=Init_shared");
+	println!("cargo:rustc-link-lib=leanshared");
+
+	// 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(format!("{lean_root}/include/lean/lean.h"))
+		// Tell cargo to invalidate the built crate whenever any of the
+		// included header files changed.
+		.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
+		// Finish the builder and generate the bindings.
+		.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("lean.rs"))
+		.expect("Couldn't write bindings!");
+}

flake.nix

@@ -27,6 +27,10 @@
         roots = [ "Callee" ];
         src = ./Callee;
       };
+      common = [
+        leanPkgs.lean-all
+        pkgs.libiconv
+      ];
     in rec {
       packages = {
         inherit (leanPkgs) lean iTree stage1 lean-all;
@@ -34,9 +38,8 @@
       };
       devShells.default = pkgs.mkShell {
         CALLEE_PATH = callee.sharedLib;
-        LEAN_INCLUDE_PATH = leanPkgs.lean-all;
+        LEAN_ROOT = leanPkgs.lean-all;
-        buildInputs = [
+        buildInputs = common ++ [
-          leanPkgs.lean-all
           pkgs.rustc
         ];
       };

src/main.rs

@@ -1,3 +1,21 @@
-fn main() {
+#[allow(non_upper_case_globals)]
-   println!("Testing!");
+#[allow(non_camel_case_types)]
+#[allow(non_snake_case)]
+mod lean {
+	include!(concat!(env!("OUT_DIR"), "/lean.rs"));
+
+	#[link(name="lean")]
+	extern {
+		pub fn lean_initialize_runtime_module();
+		pub fn lean_initialize();
+		// lean_io_mark_end_initialization is already defined.
+	}
+}
+fn main() {
+	unsafe {
+		lean::lean_initialize_runtime_module();
+		lean::lean_initialize();
+		lean::lean_io_mark_end_initialization();
+	}
+   println!("Lean initialization complete!");
 }