refactor: update linting rules and optimize directory handling in Unix

src-tauri/Cargo.toml

@@ -238,4 +238,7 @@ redundant_clone = "deny"
 # option_if_let_else = "deny" // 过于激进，暂时不开启
 needless_pass_by_ref_mut = "deny"
 needless_collect = "deny"
-missing_const_for_fn = "deny"
+missing_const_for_fn = "deny"
+iter_with_drain = "deny"
+iter_on_single_items = "deny"
+iter_on_empty_collections = "deny"

src-tauri/src/utils/dirs.rs

@@ -6,6 +6,8 @@ use crate::{
 use anyhow::Result;
 use async_trait::async_trait;
 use once_cell::sync::OnceCell;
+#[cfg(unix)]
+use std::iter;
 use std::{fs, path::PathBuf};
 use tauri::Manager;
 
@@ -226,8 +228,7 @@ pub fn get_encryption_key() -> Result<Vec<u8>> {
 
 #[cfg(unix)]
 pub fn ensure_mihomo_safe_dir() -> Option<PathBuf> {
-    ["/tmp"]
-        .iter()
+    iter::once("/tmp")
         .map(PathBuf::from)
         .find(|path| path.exists())
         .or_else(|| {