From 44deaa71e1f38dc8232c6f962b8c1b52512ff74e Mon Sep 17 00:00:00 2001
From: Dane Johnson <daneallenjohnson@protonmail.com>
Date: Sat, 9 Apr 2022 12:42:18 -0500
Subject: [PATCH] Lua scripting

---
 Cargo.lock       | 22 ++++++++++++++++++++++
 Cargo.toml       |  1 +
 main.lua         |  1 +
 src/main.rs      |  6 ++++++
 src/scripting.rs | 32 ++++++++++++++++++++++++++++++++
 5 files changed, 62 insertions(+)
 create mode 100644 main.lua
 create mode 100644 src/scripting.rs

diff --git a/Cargo.lock b/Cargo.lock
index c2e883e..b3a4c8d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -257,6 +257,7 @@ version = "0.1.0"
 dependencies = [
  "glium",
  "gltf",
+ "hlua",
  "nalgebra-glm",
 ]
 
@@ -504,6 +505,16 @@ dependencies = [
  "gl_generator",
 ]
 
+[[package]]
+name = "hlua"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed9db71fff2e55b83d24bbbdd9ad13f0d1ff79bc265f544370f39ee0825d54e4"
+dependencies = [
+ "libc",
+ "lua52-sys",
+]
+
 [[package]]
 name = "ident_case"
 version = "1.0.1"
@@ -618,6 +629,17 @@ dependencies = [
  "cfg-if 1.0.0",
 ]
 
+[[package]]
+name = "lua52-sys"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d451db153c94e455dc817d388f9674f6232425c28db3509e90251c55b8df2f94"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "malloc_buf"
 version = "0.0.6"
diff --git a/Cargo.toml b/Cargo.toml
index 8a913dd..2d9eacd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,4 +8,5 @@ edition = "2021"
 glium = "0.31.0"
 nalgebra-glm = "0.16.0"
 gltf = { version = "1.0.0", features = ["utils"] }
+hlua = "0.4.1"
 
diff --git a/main.lua b/main.lua
new file mode 100644
index 0000000..ee35f4e
--- /dev/null
+++ b/main.lua
@@ -0,0 +1 @@
+print("Hello from a lua script!")
diff --git a/src/main.rs b/src/main.rs
index e0be298..271ef27 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,6 @@
 mod device;
 mod model;
+mod scripting;
 
 #[macro_use]
 extern crate glium;
@@ -7,6 +8,8 @@ extern crate nalgebra_glm as glm;
 
 use model::Model;
 
+use scripting::{ ScriptLang, Lua };
+
 fn main() {
     use glium::{glutin, Surface};
     
@@ -29,6 +32,9 @@ fn main() {
 
     let model = Model::new(&display, "Box.glb");
 
+    let mut script_lang = Lua::new();
+    script_lang.init();
+
     events_loop.run(move |ev, _, control_flow| {
 	if device_manager.is_pressed(&device::Key::W) {
 	    offset += 0.001;
diff --git a/src/scripting.rs b/src/scripting.rs
new file mode 100644
index 0000000..a9ab386
--- /dev/null
+++ b/src/scripting.rs
@@ -0,0 +1,32 @@
+extern crate hlua;
+
+use hlua::Lua as LuaContext;
+
+pub trait ScriptLang {
+    fn init(&mut self);
+    fn update(&mut self, delta: f32);
+}
+
+pub struct Lua {
+    ctx: LuaContext<'static>,
+}
+
+impl Lua {
+    pub fn new() -> Self {
+	Lua {
+	    ctx: LuaContext::new(),
+	}
+    }
+}
+
+impl ScriptLang for Lua {
+    fn init(&mut self) {
+	self.ctx.openlibs();
+	//self.ctx.execute::<()>("print(\"Hello!\")").unwrap();
+	self.ctx.execute_from_reader::<(), std::fs::File>(std::fs::File::open(&std::path::Path::new("main.lua")).unwrap()).unwrap();
+    }
+
+    fn update(&mut self, delta: f32) {
+	todo!();
+    }
+}