show bytes as description, implement format bytes trait

src/format.rs

@@ -0,0 +1,24 @@
+pub trait Format {
+    /// Format bytes to KB/MB/GB presentation
+    fn bytes(self) -> String;
+}
+
+impl Format for u64 {
+    fn bytes(self) -> String {
+        const KB: f32 = 1024.0;
+        const MB: f32 = KB * KB;
+        const GB: f32 = MB * KB;
+
+        let f = self as f32;
+
+        if f < KB {
+            format!("{self} B")
+        } else if f < MB {
+            format!("{:.2} KB", f / KB)
+        } else if f < GB {
+            format!("{:.2} MB", f / MB)
+        } else {
+            format!("{:.2} GB", f / GB)
+        }
+    }
+}