Displays the file size for the minified assets.

It also fixes a division by zero error when an empty file was minified.

src/Common/TaskIO.php

@@ -23,6 +23,16 @@ protected function printTaskError($text, $task = null)
         $this->writeln(" <fg=white;bg=red;options=bold>[$name]</fg=white;bg=red;options=bold> $text");
     }
 
+    protected function formatBytes($size, $precision = 2)
+    {
+        if ($size === 0) {
+            return 0;
+        }
+        $base = log($size, 1024);
+        $suffixes = array('', 'k', 'M', 'G', 'T');
+        return round(pow(1024, $base - floor($base)), $precision) . $suffixes[floor($base)];
+    }
+
     protected function getPrintedTaskName($task = null)
     {
         if (!$task) {
@@ -34,4 +44,4 @@ protected function getPrintedTaskName($task = null)
         $name = str_replace('Robo\Task\\', '' , $name);
         return $name;
     }
-}
+}

src/Task/Assets/Minify.php

@@ -243,15 +243,25 @@ public function run()
         if (false === $write_result) {
             return Result::error($this, 'File write failed.');
         }
-
-        $minified_percent = number_format(100 - ($size_after / $size_before * 100), 1);
+        if ($size_before === 0) {
+            $minified_percent = 0;
+        } else {
+            $minified_percent = number_format(100 - ($size_after / $size_before * 100), 1);
+        }
         $this->printTaskSuccess(
             sprintf(
-                'Wrote <info>%s</info> (reduced by <info>%s%%</info>)', $this->dst,
+                'Wrote <info>%s</info>',
+                $this->dst
+            )
+        );
+        $this->printTaskSuccess(
+            sprintf(
+                'Wrote <info>%s</info> (reduced by <info>%s</info> / <info>%s%%</info>)',
+                $this->formatBytes($size_after),
+                $this->formatBytes(($size_before - $size_after)),
                 $minified_percent
             )
         );
-
         return Result::success($this, 'Asset minified.');
     }
 }