Proposing an add_autohook_support() function for WordPress.

wp-autohook.php

<?php

/**
 * Simplifies addition of WordPress hooks to a class.
 *
 * Simplifies addition of WordPress hooks to a class by adding any method and using WordPress-specific PHPDoc tags
 * including @wp-autohook, @wp-nohook, @wp-action, @wp-filter and @wp-priority.
 *
 * Props Ryan McCue (https://gist.github.com/rmccue) for suggestion to use $method->getDocComment() instead of
 * passing in method properties via array arguments.
 *
 * @see: Initial inspiration: http://kovshenin.com/2012/01/hey-wordpress-how-about-a-wp_plugin-class-3797/
 *
 * @example: https://gist.github.com/1630788
 *
 * @author: Mike Schinkel - http://about.me/mikeschinkel/
 */

 /**
 * @param string|object $target - Class name or instance of class
 */
function add_autohook_support( $target ) {
  $class_reflector = new ReflectionClass( $target );

  /**
   * Look for @wp-autohook to be implicit or explicit, default to explicit.
   */
  if ( preg_match( '#@wp-autohook\s*(implicit|explicit)#', $class_reflector->getDocComment(), $match ) )
    $autohook = trim( $match[1] );
  else
    $autohook = 'explicit';

  /**
   * @var ReflectionMethod $method
   */
  foreach ( $class_reflector->getMethods( ReflectionMethod::IS_PUBLIC ) as $method ) {

    $doc_comment = $method->getDocComment();

    if ( empty( $doc_comment ) ) {

      if ( 'implicit' == $autohook ) {
        $hooks = array( $method->name );
        $default_priority = 10;
      }

    } else {

      if ( preg_match( '#@wp-nohook#', $doc_comment ) )
        continue;

      if ( preg_match( '#@wp-filter\s*(.+)#', $doc_comment, $match ) )
        $hooks = array_map( 'trim', explode( ',', $match[1] ) );

      else if ( preg_match( '#@wp-action\s*(.+)#', $doc_comment, $match ) )
        $hooks = array_map( 'trim', explode( ',', $match[1] ) );

      else if ( 'implicit' == $autohook )
        $hooks = array( $method->name );

      else
        continue;

      $default_priority = 10;
      if ( preg_match( '#@wp-priority\s*([1-9][0-9]*)#', $doc_comment, $match ) )
        $default_priority = intval( $match[1] );

    }

    $accepted_args = $method->getNumberOfParameters();
    for( $i = 0; $i < count( $hooks ); $i++ ) {
      list( $hookname, $priority ) = explode( ' ', "{$hooks[$i]} {$default_priority}" );
      add_filter( $hookname, array( $target, $method->name ), $priority, $accepted_args );
    }

  }
}