Dave Jarvis' Repositories

<?php
class RepositoryList {
  private $reposPath;

  public function __construct( $path ) {
    $this->reposPath = $path;
  }

  public function eachRepository( callable $callback ) {
    $repos = [];
    $dirs = glob( $this->reposPath . '/*', GLOB_ONLYDIR );

    if( $dirs === false ) {
      return;
    }

    foreach( $dirs as $dir ) {
      $basename = basename( $dir );

      if( $basename[0] === '.' ) {
        continue;
      }

      $repos[$basename] = [
        'name' => $basename,
        'safe_name' => $basename,
        'path' => $dir
      ];
    }

    $this->sortRepositories( $repos );

    foreach( $repos as $repo ) {
      $callback( $repo );
    }
  }

  private function sortRepositories( array &$repos ) {
    $orderFile = __DIR__ . '/order.txt';

    if( !file_exists( $orderFile ) ) {
      ksort( $repos, SORT_NATURAL | SORT_FLAG_CASE );
      return;
    }

    $lines = file( $orderFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES );
    $order = [];
    $exclude = [];

    foreach( $lines as $line ) {
      $line = trim( $line );

      if( $line === '' ) {
        continue;
      }

      if( $line[0] === '-' ) {
        $exclude[substr( $line, 1 )] = true;
      } else {
        $order[$line] = count( $order );
      }
    }

    foreach( $repos as $key => $repo ) {
      if( isset( $exclude[$repo['safe_name']] ) ) {
        unset( $repos[$key] );
      }
    }

    uasort( $repos, function( $a, $b ) use ( $order ) {
      $nameA = $a['safe_name'];
      $nameB = $b['safe_name'];
      $posA = $order[$nameA] ?? PHP_INT_MAX;
      $posB = $order[$nameB] ?? PHP_INT_MAX;

      if( $posA === $posB ) {
        return strcasecmp( $nameA, $nameB );
      }

      return $posA <=> $posB;
    } );
  }
}