Fix process.spawn yielding issue

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Fixed
+
+- Potential fix for spawned processes that yield erroring
+  with "attempt to yield across metamethod/c-call boundary"
+
 ## `0.0.5` - January 22nd, 2023
 
 ### Added

src/lib/globals/process.rs

@@ -1,11 +1,12 @@
 use std::{
     env,
     process::{exit, Stdio},
+    sync::Weak,
 };
 
 use mlua::prelude::*;
 use os_str_bytes::RawOsString;
-use smol::process::Command;
+use smol::{process::Command, LocalExecutor};
 
 use crate::utils::table_builder::TableBuilder;
 
@@ -116,20 +117,30 @@ async fn process_spawn(
     lua: &Lua,
     (program, args): (String, Option<Vec<String>>),
 ) -> LuaResult<LuaTable> {
-    // Create and spawn a child process, and
-    // wait for it to terminate with output
-    let mut cmd = Command::new(program);
-    if let Some(args) = args {
-        cmd.args(args);
-    }
-    let child = cmd
-        .current_dir(env::current_dir().map_err(LuaError::external)?)
-        .stdin(Stdio::null())
-        .stdout(Stdio::piped())
-        .stderr(Stdio::piped())
-        .spawn()
-        .map_err(LuaError::external)?;
-    let output = child.output().await.map_err(LuaError::external)?;
+    let exec = lua
+        .app_data_ref::<Weak<LocalExecutor>>()
+        .unwrap()
+        .upgrade()
+        .unwrap();
+    // Create and spawn a child process in a new task to prevent
+    // issues with yielding across the metamethod/c-call boundary
+    let output = exec
+        .spawn(async move {
+            let mut cmd = Command::new(program);
+            if let Some(args) = args {
+                cmd.args(args);
+            }
+            let child = cmd
+                .current_dir(env::current_dir().map_err(LuaError::external)?)
+                .stdin(Stdio::null())
+                .stdout(Stdio::piped())
+                .stderr(Stdio::piped())
+                .spawn()
+                .map_err(LuaError::external)?;
+            let output = child.output().await.map_err(LuaError::external)?;
+            Ok::<_, LuaError>(output)
+        })
+        .await?;
     // NOTE: If an exit code was not given by the child process,
     // we default to 1 if it yielded any error output, otherwise 0
     let code = output