fix: quote paths on windows to allow spaces in paths not be treated a…

…s multiple paths.

Note that paths that are already quoted will also be quoted, as the
current quoting implementation is unconditional.

src/windows.rs

@@ -1,20 +1,32 @@
-use std::{ffi::OsStr, io, os::windows::ffi::OsStrExt, ptr};
+use std::{
+    ffi::{OsStr, OsString},
+    io,
+    os::windows::ffi::OsStrExt,
+    ptr,
+};
 
 use std::os::raw::c_int;
 use windows_sys::Win32::UI::Shell::ShellExecuteW;
 
 use crate::IntoResult;
 
 fn convert_path(path: &OsStr) -> io::Result<Vec<u16>> {
-    let mut maybe_result: Vec<_> = path.encode_wide().collect();
-    if maybe_result.iter().any(|&u| u == 0) {
+    let mut quoted_path = OsString::with_capacity(path.len());
+
+    // Surround path with double quotes "" to handle spaces in path.
+    quoted_path.push("\"");
+    quoted_path.push(&path);
+    quoted_path.push("\"");
+
+    let mut wide_chars: Vec<_> = quoted_path.encode_wide().collect();
+    if wide_chars.iter().any(|&u| u == 0) {
         return Err(io::Error::new(
             io::ErrorKind::InvalidInput,
             "path contains NUL byte(s)",
         ));
     }
-    maybe_result.push(0);
-    Ok(maybe_result)
+    wide_chars.push(0);
+    Ok(wide_chars)
 }
 
 pub fn that<T: AsRef<OsStr>>(path: T) -> io::Result<()> {