mp_calc.module

gistfile1.php

<?php
/**
 * Implementation of hook_filter_info().
 */
function mp_run_calc_filter_info() {
  $filters['mp_run_calc_filter'] = array(
    'title' => t('Motionsplan - Input filter to show forms in nodes'),
    'description' => t('Substitutes [motionsplan:form_name] tags with the a form from the module.'),
    'process callback'  => 'mp_run_calc_filter_process',
    'tips callback' => 'mp_run_calc_filter_tips',
    'cache' => TRUE,
  );
  return $filters;
}

/**
 * Process callback for hook_filter_info().
 */
function mp_run_calc_filter_process($text, $filter, $format) {
  return preg_replace_callback('@\[motionsplan:(\d+)?\]@', '_mp_run_calc_display_embed', $text);
}

/**
 * Implements hook_filter_tips().
 */
function mp_run_calc_filter_tips($filter, $format, $long = FALSE) {
  return t('Use [motionsplan:form-name] to embed the form');
}

/**
 * Display a form by replacing the text.
 */
function _mp_run_calc_display_embed($matches) {
  $data['formname'] = $matches[1];

  return implode("\n", $data);
}