source: sipes/0.3-modules/proyectos_operativos_revision/proyectos_operativos_revision.module @ 303fae2

<?php
  /**
  * Sistema Integral de Planificación y Presupuesto (SIPP)
  * @file proyectos_operativos_mcti.module
  * Drupal part Module to Sistema Integral de Planificación y Presupuesto (SIPP)
  * Copyright 2013 Sistema Automatizado para la Planificación Estratégico-Situacional en la Administración Pública Venezolana (CENDITEL)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  * 
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  * 
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
  * @author Cenditel Merida - Ing. Jose Puentes
  * @date 2015-02-03 // (a&#241;o-mes-dia)
  * @version 0.1 // (0.1)
  *
  */

/**
 *
 */ 
function proyectos_operativos_revision_menu() {
  $items = array();
  $items['proyectosop/%node/revisions/view/%/%'] = array(
    'title' => 'Diff',
    'page callback' => 'proyectos_operativos_revision_diff_diffs_show',
    'page arguments' => array(1, 4, 5),
    'type' => MENU_LOCAL_TASK,
    'access callback' => 'diff_node_revision_access',
    'access arguments' => array(1),
    'tab_parent' => 'proyectosop/%',
  );

  return $items;
}

/**
 * Implementation of hook_action_info().
 * asignar los proyectos operativos a los usuarios.
 */
 function proyectos_operativos_revision_action_info() {
   return array(
     'proyectos_operativos_revision_action' => array(
       'description' => t('Compara los tipos de contenido'),
       'type' => 'system',
       'configurable' => true,
     ),
   );
 }

/**
 * implementacion del hook_action_submit()
 */
function proyectos_operativos_revision_action_submit($form, $form_state) {
  foreach ($form_state['storage']['selection'] as $id => $info) {
    if($info->vid) {
      $vids[] = $info->vid;
    }
    if($info->node_revisions_title) {
      $titles[] = $info->node_revisions_title;
    }
    if($info->node_nid) {
      $nids[] = $info->node_nid; 
    }
    if($info->users_uid) {
      $users[] = $info->users_uid;
    }
  }

  $old_vid = min($vids[0], $vids[1]);
  $new_vid = max($vids[0], $vids[1]);
  drupal_goto('proyectosop/'. $nids[0] .'/revisions/view/'. $old_vid .'/'. $new_vid);
}

/**
 * Implementar la accion
 */
 function proyectos_operativos_revision_action(&$node, $context) {
  module_load_include('inc', 'node', 'node.pages');
  module_load_include('inc', 'diff', 'diff.pages');

  //$output =  proyectos_operativos_revision_diff_diffs_show($node, $context['vid']);
   drupal_set_message(t('Los proyectos Fueron Comparados'));
 }

/**
 * Validation for input form to select two revisions.
 */
function proyectos_operativos_revision_action_validate($form, $form_state) {
  foreach ($form_state['values']['objects']['selection'] as $id => $info) {
    if($info) {
      $vids[] = $info;
    }
  }
  if (count($vids) != 2) {
    form_set_error('op', t('Porfavor seleccione solo dos articulos a comparar.'));
  }
}

/**
 * Implementation of hook_form_alter()
 */
function proyectos_operativos_revision_form_alter(&$form, $form_state, $form_id) {
  if ($form_id == 'workflow_tab_form' && $form['node']['#value']->type == 'proyectos_operativos') {
    $form['#submit'][] = 'proyectos_operativos_revision_workflow_tab_form_submit';
  }
}

/**
 * agrega la informacion del nodo, asi como la del flujo de trabajo
 */
function proyectos_operativos_revision_workflow_tab_form_submit($form, &$form_state) {
  $values = $form_state['values'];
  db_query("INSERT INTO {proyectos_operativos_workflow_revision} (nid, vid, sid) VALUES (%d, %d, %d)", $values['node']->nid, $values['node']->vid, $values['workflow']);
}

/**
 * Presenta el nombre del estado del flujo de trabajo
 */
function proyectos_operativos_revision_workflow_search($sid) {
  $result = db_result(db_query("SELECT w.state FROM {workflow_states} AS w INNER JOIN {proyectos_operativos_workflow_revision} AS p ON p.sid = w.sid WHERE p.sid = %d", $sid));
  return $result;
}

/**
 * Presenta el comentario del estado del flujo de trabajo
 */
function proyectos_operativos_revision_workflow_comment_search($sid) {
  $result = db_result(db_query("SELECT w.comment FROM {workflow_node_history} AS w INNER JOIN {proyectos_operativos_workflow_revision} AS p ON p.sid = w.sid WHERE p.sid = %d AND w.comment!=''", $sid));
  return $result;
}

/**
 * Implementation of hook_views_api().
 */
function proyectos_operativos_revision_views_api() {
  return array(
    'api' => '2.0',
    'path' => drupal_get_path('module', 'proyectos_operativos_revision') . '/views',
  );
}

/**
 * Create output string for a comparison of 'node' between
 * versions 'old_vid' and 'new_vid'.
 *
 * @param $node
 *   Node on which to perform comparison
 * @param $old_vid
 *   Version ID of the old revision.
 * @param $new_vid
 *   Version ID of the new revision.
 */
function proyectos_operativos_revision_diff_diffs_show($node, $old_vid, $new_vid) {
  module_load_include('inc', 'diff', 'diff.pages');
  // Set same title as on the 'Revisions' tab for consistency
  drupal_set_title(t('Revisions for %title', array('%title' => $node->title)));

  $node_revisions = node_revision_list($node);

  $old_node = node_load($node->nid, $old_vid);
  $new_node = node_load($node->nid, $new_vid);

  // Generate table header (date, username, logmessage).
  $old_header = t('!date by !username', array(
    '!date' => l(format_date($old_node->revision_timestamp), "proyectosop/$node->nid/revisions/$old_node->vid/view"),
    '!username' => theme('username', $node_revisions[$old_vid]),
  ));
  $new_header = t('!date by !username', array(
    '!date' => l(format_date($new_node->revision_timestamp), "proyectosop/$node->nid/revisions/$new_node->vid/view"),
    '!username' => theme('username', $node_revisions[$new_vid]),
  ));

  $old_log = $old_node->log != '' ? '<p class="revision-log">'. filter_xss($old_node->log) .'</p>' : '';
  $new_log = $new_node->log != '' ? '<p class="revision-log">'. filter_xss($new_node->log) .'</p>' : '';

  // Generate previous diff/next diff links.
  $next_vid = _diff_get_next_vid($node_revisions, $new_vid);
  if ($next_vid) {
    $next_link = l(t('next diff >'), 'proyectosop/'. $node->nid .'/revisions/view/'. $new_vid .'/'. $next_vid);
  }
  else {
    $next_link = '';
  }
  $prev_vid = _diff_get_previous_vid($node_revisions, $old_vid);
  if ($prev_vid) {
    $prev_link = l(t('< previous diff'), 'proyectosop/'. $node->nid .'/revisions/view/'. $prev_vid .'/'. $old_vid);
  }
  else {
    $prev_link = '';
  }

  $cols = _diff_default_cols();
  $header = _diff_default_header($old_header, $new_header);
  $rows = array();
  if ($old_log || $new_log) {
    $rows[] = array(
      array(
        'data' => $old_log,
        'colspan' => 2
      ),
      array(
        'data' => $new_log,
        'colspan' => 2
      )
    );
  }
  $rows[] = array(
    array(
      'data' => $prev_link,
      'class' => 'diff-prevlink',
      'colspan' => 2
    ),
    array(
      'data' => $next_link,
      'class' => 'diff-nextlink',
      'colspan' => 2
    )
  );
  $rows = array_merge($rows, _diff_body_rows($old_node, $new_node));
  $output = theme('diff_table', $header, $rows, array('class' => 'diff'), NULL, $cols);

  if ($node->vid == $new_vid) {
    $output .= '<div class="diff-section-title">'. t('Current revision:') .'</div>';
  }
  else {
    $output .= '<div class="diff-section-title">'. t('Revision of !new_date:', array('!new_date' => format_date($new_node->revision_timestamp))) .'</div>';
  }
  // Don't include node links (final argument) when viewing the diff.
  $output .= theme('proyectos_operativos_mcti_ficha_proyecto', $new_node);
  //$output .= node_view($new_node, FALSE, FALSE, FALSE);
  return $output;
}