sort entries in directory view

src/main.rs

@@ -8,6 +8,7 @@ use crossterm::{
 	},
 };
 use std::{
+	cmp::Ordering,
 	env, fs,
 	io::{stdout, Write},
 	path::PathBuf,
@@ -255,6 +256,15 @@ impl Navigator {
 		for file in fs::read_dir(&self.path).unwrap().flatten() {
 			self.files.push(file.path());
 		}
+		self.files[1..].sort_unstable_by(|path, other| {
+			if path.is_dir() == other.is_dir() {
+				path.cmp(other)
+			} else if path.is_dir() {
+				Ordering::Less
+			} else {
+				Ordering::Greater
+			}
+		});
 	}
 
 	fn any_unsaved(&self) -> bool {