feat: port to Microsoft Windows

rust/src/util.rs

@@ -1,3 +1,4 @@
+use anyhow::{anyhow, Result};
 use directories::ProjectDirs;
 use std::path::{Path, PathBuf};
 
@@ -31,6 +32,11 @@ pub fn cache_dir() -> PathBuf {
     get_dirs().cache_dir().to_owned()
 }
 
+pub fn path_to_str(p: impl AsRef<Path>) -> Result<String> {
+    Ok(p.as_ref().to_str()
+        .ok_or_else(|| anyhow!("Invalid path: {}", p.as_ref().to_string_lossy()))?.to_owned())
+}
+
 pub fn copy_recursive(src: &Path, dst: &Path) -> std::io::Result<()> {
     std::fs::create_dir_all(&dst).unwrap();
     for entry in std::fs::read_dir(src)? {