Make ProgressBar::setMaxSteps public

This is useful in cases when target of tracking
changes its size during progress advancement.

Author: ostrolucky

src/Symfony/Component/Console/Helper/ProgressBar.php

@@ -295,6 +295,13 @@ public function setProgress(int $step)
         }
     }
 
+    public function setMaxSteps(int $max)
+    {
+        $this->format = null;
+        $this->max = max(0, $max);
+        $this->stepWidth = $this->max ? Helper::strlen((string) $this->max) : 4;
+    }
+
     /**
      * Finishes the progress output.
      */
@@ -362,12 +369,6 @@ private function setRealFormat(string $format)
         $this->formatLineCount = substr_count($this->format, "\n");
     }
 
-    private function setMaxSteps(int $max)
-    {
-        $this->max = max(0, $max);
-        $this->stepWidth = $this->max ? Helper::strlen((string) $this->max) : 4;
-    }
-
     /**
      * Overwrites a previous message to the output.
      */

src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php

@@ -592,6 +592,29 @@ public function testWithoutMax()
         );
     }
 
+    public function testSettingMaxStepsDuringProgressing()
+    {
+        $output = $this->getOutputStream();
+        $bar = new ProgressBar($output);
+        $bar->start();
+        $bar->setProgress(2);
+        $bar->setMaxSteps(10);
+        $bar->setProgress(5);
+        $bar->setMaxSteps(100);
+        $bar->setProgress(10);
+        $bar->finish();
+
+        rewind($output->getStream());
+        $this->assertEquals(
+            rtrim('    0 [>---------------------------]').
+            rtrim($this->generateOutput('    2 [-->-------------------------]')).
+            rtrim($this->generateOutput('  5/10 [==============>-------------]  50%')).
+            rtrim($this->generateOutput('  10/100 [==>-------------------------]  10%')).
+            rtrim($this->generateOutput(' 100/100 [============================] 100%')),
+            stream_get_contents($output->getStream())
+        );
+    }
+
     public function testWithSmallScreen()
     {
         $output = $this->getOutputStream();