Add Bytes and impl Display for Bytes

src/bytes.rs

@@ -0,0 +1,30 @@
+use std::cmp;
+
+const UNITS: [&str; 4] = ["B", "kB", "MB", "GB"];
+
+struct Bytes {
+    bytes: f64,
+}
+
+impl Bytes {
+    pub fn new(bytes: u64) -> Self {
+        Self {
+            bytes: bytes as f64,
+        }
+    }
+}
+
+impl std::fmt::Display for Bytes {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let num = self.bytes;
+        debug_assert!(num >= 0.0);        
+        if num < 1_f64 {
+            return write!(f, "{} B", num);
+        }
+        let delimiter = 1000_f64;
+        let exponent = cmp::min((num.ln() / 6.90775).floor() as i32, 4);
+
+        write!(f, "{:.2} ", num / delimiter.powi(exponent))?;
+        write!(f, "{}", UNITS[exponent as usize])
+    }
+}

src/extension.rs

@@ -7,7 +7,7 @@ use std::{
 
 use CompressionFormat::*;
 
-use crate::{debug, utils::to_utf};
+use crate::utils::to_utf;
 
 /// Represents the extension of a file, but only really caring about
 /// compression formats (and .tar).

src/main.rs

@@ -1,3 +1,4 @@
+mod bytes;
 mod cli;
 mod compressors;
 mod decompressors;