Can you create a small example application that allows to reproduce your issue?

Can you create a small example application that allows to reproduce your issue?

use Symfony\Component\Console\Helper\ProgressBar;
use Symfony\Component\Console\Input\ArgvInput;
use Symfony\Component\Console\Output\ConsoleOutput;
use Symfony\Component\Console\Style\SymfonyStyle;

require __DIR__.'/vendor/autoload.php';

$output = new SymfonyStyle(new ArgvInput(), new ConsoleOutput());
$progress = $output->createProgressBar(20);
$progress->setPlaceholderFormatterDefinition(
    'current',
    fn (ProgressBar $bar) => 'Counting: '. $bar->getPlaceholderFormatterDefinition('current')($bar)
);

$progress->start();
for ($i=0; $i < 20; $i++) {
    $progress->advance();
    sleep(1);
}
$progress->finish();
$output->newLine();

If you do this at the point of setting a current placeholder format definition, the code will work

- $progress->setPlaceholderFormatterDefinition(
+ // $progress->setPlaceholderFormatterDefinition(
-    'current',
+   //'current',
-    fn (ProgressBar $bar) => 'Counting: '. $bar->getPlaceholderFormatterDefinition('current')($bar)
+    //fn (ProgressBar $bar) => 'Counting: '. $bar->getPlaceholderFormatterDefinition('current')($bar)
- );
+ //);

This bug has two different behaves, either it hungs (nothing happens), or a segmentation fault error is emitted.

Status: Reviewed

With this code, you make a recursive loop on current formatter.

Instead using getPlaceholderFormatterDefinition('current') when setPlaceholderFormatterDefinition('current), you maybe write something like this

$progress->setPlaceholderFormatterDefinition(
  'current',
  fn (ProgressBar $bar) => 'Reading: '.str_pad($bar->getProgress(), $bar->getStepWidth(), ' ', \STR_PAD_LEFT)
)

(Definition of current in ProgressBar https://github.com/symfony/symfony/blob/6.2/src/Symfony/Component/Console/Helper/ProgressBar.php#L540)

However with this way you cannot have same output as default because getStepWidth is private.

Another approach is to not use same formatter name:

$progress->setPlaceholderFormatterDefinition(
      'my_current',
      fn(ProgressBar $bar) => 'Reading: '.$bar->getPlaceholderFormatterDefinition('current')($bar)
  );
$progress->setFormat('%my_current%')

You can find default ProgressBar formats here: https://github.com/symfony/symfony/blob/6.2/src/Symfony/Component/Console/Helper/ProgressBar.php#L551

@alamirault I've tried your approach before creating this issue, I want to keep using the existing progress bar formatters because they all have the %curent% placeholder, so editing the placeholder's callback will be much more convenient.

I'm not seeking to create a progress bar with new customizations, it's just for a specific area of my codebase.