1 files changed, 27 insertions, 28 deletions

diff --git a/src/cmd/folders.rs b/src/cmd/folders.rs
index b50daa9..417203c 100644
--- a/src/cmd/folders.rs
+++ b/src/cmd/folders.rs
@@ -1,50 +1,49 @@
-use std::collections::BTreeSet;
-use std::ffi::{OsStr, OsString};
 use std::path::{Path, PathBuf};
-use std::sync::LazyLock;
 
 use protobuf::Message as _;
 
 use crate::error::Result;
 use crate::pb3::jwebmail::{FoldersReq, FoldersResp};
 
-static REQUIRED_MAILDIR_DIRS: LazyLock<BTreeSet<OsString>> = LazyLock::new(|| {
-    [
-        OsString::from("cur"),
-        "new".into(),
-        "tmp".into(),
-        "maildirfolder".into(),
-    ]
-    .into()
-});
-
 fn is_mailsubdir(p: &Path) -> bool {
-    p.is_dir()
-        && p.file_name()
-            .map_or(false, |fname| fname.to_string_lossy().starts_with('.'))
-        && p.read_dir()
-            .map(|dir| {
-                dir.filter_map(|child| {
-                    child
-                        .ok()
-                        .and_then(|dir_entry| dir_entry.path().file_name().map(OsStr::to_owned))
-                })
-                .collect::<BTreeSet<_>>()
-                .is_superset(&*REQUIRED_MAILDIR_DIRS)
-            })
-            .unwrap_or_default()
+    if !p.is_dir() {
+        return false;
+    }
+    if !p.file_name().map_or(false, |fname| {
+        fname.len() > 1 && fname.to_string_lossy().starts_with('.')
+    }) {
+        return false;
+    }
+    let mut buf = p.to_owned();
+    buf.push("cur");
+    if !buf.is_dir() {
+        return false;
+    }
+    buf.pop();
+    buf.push("new");
+    if !buf.is_dir() {
+        return false;
+    }
+    buf.pop();
+    buf.push("tmp");
+    if !buf.is_dir() {
+        return false;
+    }
+    true
 }
 
 pub fn folders(path: PathBuf, req: &[u8]) -> Result<Vec<u8>> {
     let _ = FoldersReq::parse_from_bytes(req)?;
 
-    let subdirs = path
+    let mut subdirs: Vec<_> = path
         .read_dir()?
         .filter_map(|d| d.ok())
         .filter(|d| is_mailsubdir(&d.path()))
         .filter_map(|d| Some(d.path().file_name()?.to_string_lossy()[1..].to_owned()))
         .collect();
 
+    subdirs.sort();
+
     let mut res = FoldersResp::new();
     res.folders = subdirs;
     res.write_to_bytes().map_err(|e| e.into())