Use project root dir as script's cwd

Author: rtfeldman

crates/assistant_scripting/src/sandbox_preamble.lua

@@ -37,7 +37,6 @@ io.open = sb_io_open
 -- Add the sandboxed io library to the sandbox environment
 -- sandbox.io = io -- Uncomment this line to re-enable sandboxed file I/O.
 
-
 -- Load the script with the sandbox environment
 local user_script_fn, err = load(user_script, nil, "t", sandbox)
 

crates/assistant_scripting/src/session.rs

@@ -119,6 +119,14 @@ impl ScriptSession {
                 let lua = Lua::new();
                 lua.set_memory_limit(2 * 1024 * 1024 * 1024)?; // 2 GB
                 let globals = lua.globals();
+
+                // Use the project root dir as the script's current working dir.
+                if let Some(root_dir) = &root_dir {
+                    if let Some(root_dir) = root_dir.to_str() {
+                        globals.set("cwd", root_dir)?;
+                    }
+                }
+
                 globals.set(
                     "sb_print",
                     lua.create_function({