Support negative byte values in FS::format method (#50)

Author: SmetDenis

src/FS.php

@@ -284,22 +284,19 @@ public static function ls(string $dir): array
      */
     public static function format(int $bytes, int $decimals = 2): string
     {
-        $exp     = 0;
-        $value   = 0;
-        $symbols = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
+        $isNegative = $bytes < 0;
 
-        $bytes = (float)$bytes;
+        $symbols = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
 
-        if ($bytes > 0) {
-            $exp   = (int)\floor(\log($bytes) / \log(1024));
-            $value = ($bytes / (1024 ** \floor($exp)));
-        }
+        $bytes = \abs((float)$bytes);
+        $exp   = (int)\floor(\log($bytes) / \log(1024));
+        $value = ($bytes / (1024 ** \floor($exp)));
 
         if ($symbols[$exp] === 'B') {
             $decimals = 0;
         }
 
-        return \number_format($value, $decimals, '.', '') . ' ' . $symbols[$exp];
+        return ($isNegative ? '-' : '') . \number_format($value, $decimals, '.', '') . ' ' . $symbols[$exp];
     }
 
     /**

tests/FileSystemTest.php

@@ -284,9 +284,18 @@ public function testLS(): void
 
     public function testFormat(): void
     {
+        $size = FS::format(0);
+        is('0 B', $size);
+
+        $size = FS::format(0, 0);
+        is('0 B', $size);
+
         $size = FS::format(512, 0);
         is('512 B', $size);
 
+        $size = FS::format(-512, 0);
+        is('-512 B', $size);
+
         $size = FS::format(512);
         is('512 B', $size);
 
@@ -299,6 +308,9 @@ public function testFormat(): void
         $size = FS::format(19971597926);
         is('18.60 GB', $size);
 
+        $size = FS::format(-19971597926);
+        is('-18.60 GB', $size);
+
         $size = FS::format(2748779069440, 1);
         is('2.5 TB', $size);