Allow StarterKit forked themes with prefix

I'm narrowing down on 📌 Making a theme compatible with core's theme generator is too difficult Needs work

Where this code was introduced in GenerateTheme:

  private static function namePatterns(string $machine_name, string $label): array {
    return [
      'machine_name' => $machine_name,
      'machine_name_camel' => u($machine_name)->camel(),
      'machine_name_pascal' => u($machine_name)->camel()->title(),
      'machine_name_title' => u($machine_name)->title(),
      'label' => $label,
      'label_camel' => u($label)->camel(),
      'label_pascal' => u($label)->camel()->title(),
      'label_title' => u($label)->title(),
    ];
  }

Breaking that out with the Issue Summary example:

$patterns = [
  'old' => [
    'machine_name' => 'galactus',
    'machine_name_camel' => 'galactus',
    'machine_name_pascal' => 'Galactus',
    'machine_name_title' => 'Galactus',
    'label' => 'Galactus',
    'label_camel' => 'galactus',
    'label_pascal' => 'Galactus',
    'label_title' => 'Galactus',
  ],
  'new' => [
    'machine_name' => 'galactus_ta',
    'machine_name_camel' => 'galactusTa',
    'machine_name_pascal' => 'GalactusTa',
    'machine_name_title' => 'Galactus_ta',
    'label' => 'galactus_ta',
    'label_camel' => 'galactusTa',
    'label_pascal' => 'GalactusTa',
    'label_title' => 'Galactus_ta',
  ],
];
$filename = str_replace($patterns['old'], $patterns['new'], $old_filename);

Why does it always add TaTa_ to the new $filename in these examples
$old_filename = 'galactus.settings.yml'
$filename = 'galactusTaTa_ta.settings.yml'
$old_filename = 'block.block.galactus_mainpagecontent.yml'
$filename = 'block.block.galactusTaTa_ta_mainpagecontent.yml'
$old_filename = 'block.block.galactus_pagetitle.yml'
$filename = 'block.block.galactusTaTa_ta_pagetitle.yml'
$old_filename = 'block.block.galactus_tabs.yml'
$filename = 'block.block.galactusTaTa_ta_tabs.yml'
$old_filename = 'block.block.galactus_primaryadminactions.yml'
$filename = 'block.block.galactusTaTa_ta_primaryadminactions.yml'
$old_filename = 'block.block.galactus_main_menu.yml'
$filename = 'block.block.galactusTaTa_ta_main_menu.yml'
$old_filename = 'block.block.galactus_breadcrumbs.yml'
$filename = 'block.block.galactusTaTa_ta_breadcrumbs.yml'
$old_filename = 'block.block.galactus_help.yml'
$filename = 'block.block.galactusTaTa_ta_help.yml'
$old_filename = 'block.block.galactus_drawer.yml'
$filename = 'block.block.galactusTaTa_ta_drawer.yml'
$old_filename = 'galactus.schema.yml'
$filename = 'galactusTaTa_ta.schema.yml'
$old_filename = 'galactus.theme'
$filename = 'galactusTaTa_ta.theme'
$old_filename = 'galactus.libraries.yml'
$filename = 'galactusTaTa_ta.libraries.yml'
$old_filename = 'galactus.breakpoints.yml'
$filename = 'galactusTaTa_ta.breakpoints.yml'
$old_filename = 'galactus.info.yml'
$filename = 'galactusTaTa_ta.info.yml'

It applies to more than just files, it's only that this is easy to represent.

Still working on a solution but it would be nice to know why so many variations for the replacements were needed in the first place.

This affects themes like https://www.drupal.org/project/basic → which I would like to be a starterkit theme.

Seems to have an error.

Could issue summary also be filled out please

Thanks.

@smustgrave, I don't have a fix but the tests do demo the problem.

Updated the issue summary to help make this clearer