add convenient progress bar method

src/Illuminate/Console/Concerns/InteractsWithIO.php

@@ -2,6 +2,7 @@
 
 namespace Illuminate\Console\Concerns;
 
+use Closure;
 use Illuminate\Console\OutputStyle;
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Support\Str;
@@ -237,6 +238,38 @@ public function table($headers, $rows, $tableStyle = 'default', array $columnSty
         $table->render();
     }
 
+    /**
+     * Execute a given callback while advancing a progress bar.
+     *
+     * @param  iterable|int  $totalSteps
+     * @param  \Closure  $callback
+     * @return mixed|void
+     */
+    public function withProgressBar($totalSteps = 0, Closure $callback)
+    {
+        $bar = $this->output->createProgressBar(
+            is_iterable($totalSteps) ? count($totalSteps) : $totalSteps
+        );
+
+        $bar->start();
+
+        if (is_iterable($totalSteps)) {
+            foreach ($totalSteps as $value) {
+                $callback($value, $bar);
+
+                $bar->advance();
+            }
+        } else {
+            $callback($bar);
+        }
+
+        $bar->finish();
+
+        if (is_iterable($totalSteps)) {
+            return $totalSteps;
+        }
+    }
+
     /**
      * Write a string as information output.
      *