adds a simple one-word to_string variant

this way you can `sort -h` on an output column on the command line

Author: wookietreiber

src/lib.rs

@@ -171,41 +171,63 @@ impl ByteSize {
 
     #[inline(always)]
     pub fn to_string_as(&self, si_unit: bool) -> String {
-        to_string(self.0, si_unit)
+        to_string(self.0, si_unit, false)
+    }
+
+    #[inline(always)]
+    pub fn to_simple_string_as(&self, si_unit: bool, simple: bool) -> String {
+        to_string(self.0, si_unit, simple)
     }
 }
 
-pub fn to_string(bytes: u64, si_prefix: bool) -> String {
+pub fn to_string(bytes: u64, si_prefix: bool, simple: bool) -> String {
     let unit = if si_prefix { KIB } else { KB };
     let unit_base = if si_prefix { LN_KIB } else { LN_KB };
     let unit_prefix = if si_prefix {
         UNITS_SI.as_bytes()
     } else {
         UNITS.as_bytes()
     };
-    let unit_suffix = if si_prefix { "iB" } else { "B" };
+
+    let unit_suffix = if simple {
+        ""
+    } else if si_prefix {
+        "iB"
+    } else {
+        "B"
+    };
 
     if bytes < unit {
-        format!("{} B", bytes)
+        if simple {
+            format!("{}", bytes)
+        } else {
+            format!("{} B", bytes)
+        }
     } else {
         let size = bytes as f64;
         let exp = match (size.ln() / unit_base) as usize {
             e if e == 0 => 1,
             e => e,
         };
 
+        let prefix = if simple {
+            format!("{}", unit_prefix[exp - 1] as char).to_uppercase()
+        } else {
+            format!(" {}", unit_prefix[exp - 1] as char)
+        };
+
         format!(
-            "{:.1} {}{}",
+            "{:.1}{}{}",
             (size / unit.pow(exp as u32) as f64),
-            unit_prefix[exp - 1] as char,
+            prefix,
             unit_suffix
         )
     }
 }
 
 impl Display for ByteSize {
     fn fmt(&self, f: &mut Formatter) -> Result {
-        write!(f, "{}", to_string(self.0, false))
+        write!(f, "{}", to_string(self.0, false, false))
     }
 }
 
@@ -362,4 +384,39 @@ mod tests {
     fn test_to_string() {
         assert_to_string("609.0 PB", ByteSize::pb(609), false);
     }
+
+    fn assert_simple(expected: &str, b: ByteSize, si: bool) {
+        assert_eq!(expected.to_string(), b.to_simple_string_as(si, true));
+    }
+
+    #[test]
+    fn test_simple() {
+        assert_simple("215", ByteSize::b(215), true);
+        assert_simple("215", ByteSize::b(215), false);
+
+        assert_simple("1.0K", ByteSize::kib(1), true);
+        assert_simple("1.0K", ByteSize::kib(1), false);
+
+        assert_simple("293.9K", ByteSize::kb(301), true);
+        assert_simple("301.0K", ByteSize::kb(301), false);
+
+        assert_simple("1.0M", ByteSize::mib(1), true);
+        assert_simple("1048.6K", ByteSize::mib(1), false);
+
+        // a bug case: https://github.com/flang-project/bytesize/issues/8
+        assert_simple("1.9G", ByteSize::mib(1907), true);
+        assert_simple("2.0G", ByteSize::mib(1908), false);
+
+        assert_simple("399.6M", ByteSize::mb(419), true);
+        assert_simple("419.0M", ByteSize::mb(419), false);
+
+        assert_simple("482.4G", ByteSize::gb(518), true);
+        assert_simple("518.0G", ByteSize::gb(518), false);
+
+        assert_simple("741.2T", ByteSize::tb(815), true);
+        assert_simple("815.0T", ByteSize::tb(815), false);
+
+        assert_simple("540.9P", ByteSize::pb(609), true);
+        assert_simple("609.0P", ByteSize::pb(609), false);
+    }
 }