<?php
// $Id$

/**
 * @file
 * Enables keeping an easily and regularly updated web page or a blog.
 */

/**
 * Implementation of hook_node_name().
 */
function blog_node_name($node) {
  return t('personal blog entry');
}

/**
 * Implementation of hook_perm().
 */
function blog_perm() {
  return array('edit own blog');
}

/**
 * Implementation of hook_access().
 */
function blog_access($op, $node) {
  global $user;

  if ($op == 'create') {
    return user_access('edit own blog') && $user->uid;
  }

  if ($op == 'update' || $op == 'delete') {
    if (user_access('edit own blog') && ($user->uid == $node->uid)) {
      return TRUE;
    }
  }
}

/**
 * Implementation of hook_user().
 */
function blog_user($type, &$edit, &$user) {
  if ($type == 'view' && user_access('edit own blog', $user)) {
    return array(t('History') => form_item(t('Blog'), l(t('view recent blog entries'), "blog/$user->uid", array('title' => t("Read %username's latest blog entries.", array('%username' => $user->name))))));
  }
}

/**
 * Implementation of hook_help().
 */
function blog_help($section) {
  switch ($section) {
    case 'admin/help#blog':
      return t("
      <p>Drupal's blog module allows registered users to maintain an online weblog (commonly known as a blog), often referred to as an online journal or diary.  These can be filled with daily thoughts, poetry, boneless blabber, spiritual theories, intimate details, valuable experiences, cynical rants, semi-coherent comments, writing experiments, artistic babblings, critics on current facts, fresh insights, diverse dreams, chronicles and mumbling madness available for public consumption.</p>
      <p>Blogs are made up of individual entries (nodes) that are timestamped and are typically viewed by day as you would a diary.  Blogs often contain links to things you've seen and/or agree/disagree with.  A typical example of a long term blog can be seen at %scripting-com.</p>
      <p>The blog module adds a \"user blogs\" navigation link to the site, which takes any visitor to a page that displays the most recent blog entries from all the users on the site. Personal user menus gain a \"create a blog entry\" link (which takes you to a submission form) and a \"view personal blog\" link (which displays your blog entries as other people will see them).  On the bottom of each of your own blog entries, there is an \"edit this blog entry\" link that lets you edit or delete that entry.</p>
      <p>If a user has the ability to post blogs, then the import module (news aggregator) will display a blog-it link <strong>(b)</strong> next to each news item in its lists.  Click on this and you will be taken to the blog submission form, with the title, a link to the item, and a link to the source into the body text already in the text box, ready for you to add your explanation.  This actively encourages people to add blog entries about things they see and hear elsewhere in the Drupal site and from your syndicated partner sites.</p>", array('%scripting-com' => '<a href="http://www.scripting.com/">http://www.scripting.com/</a>'));
    case 'admin/modules#description':
      return t('Enables keeping an easily and regularly updated web page or a blog.');
    case 'node/add#blog':
      return t("A blog is a regularly updated journal or diary made up of individual posts shown in reversed chronological order.  A blog is tightly coupled to the author so each user will have his 'own' blog.");
  }
}

/**
 * Displays an RSS feed containing recent blog entries of a given user.
 */
function blog_feed_user($uid = 0) {
  global $user;

  if ($uid) {
    $account = user_load(array('uid' => $uid, 'status' => 1));
  }
  else {
    $account = $user;
  }

  $result = db_query_range(db_rewrite_sql("SELECT n.nid, n.title, n.teaser, n.created, u.name, u.uid FROM {node} n INNER JOIN {users} u ON n.uid = u.uid WHERE n.type = 'blog' AND u.uid = %d AND n.status = 1 ORDER BY n.created DESC"), $uid, 0, 15);
  $channel['title'] = $account->name ."'s blog";
  $channel['link'] = url("blog/$uid", NULL, NULL, TRUE);
  $channel['description'] = $term->description;
  node_feed($result, $channel);
}

/**
 * Displays an RSS feed containing recent blog entries of all users.
 */
function blog_feed_last() {
  $result = db_query_range(db_rewrite_sql("SELECT n.nid, n.title, n.teaser, n.created, u.name, u.uid FROM {node} n INNER JOIN {users} u ON n.uid = u.uid WHERE n.type = 'blog' AND n.status = 1 ORDER BY n.created DESC"), 0, 15);
  $channel['title'] = variable_get('site_name', 'drupal') .' blogs';
  $channel['link'] = url('blog', NULL, NULL, TRUE);
  $channel['description'] = $term->description;
  node_feed($result, $channel);
}

/**
 * Menu callback; displays a Drupal page containing recent blog entries.
 */
function blog_page($a = NULL, $b = NULL) {

  if (is_numeric($a)) { // $a is a user ID
    if ($b == 'feed') {
      blog_feed_user($a);
    }
    else {
      blog_page_user($a);
    }
  }
  else if ($a == 'feed') {
    blog_feed_last();
  }
  else {
    blog_page_last();
  }
}

/**
 * Displays a Drupal page containing recent blog entries of a given user.
 */
function blog_page_user($uid) {
  global $user;

  $account = user_load(array((is_numeric($uid) ? 'uid' : 'name') => $uid, 'status' => 1));

  if ($account->uid) {
    drupal_set_title($title = t("%name's blog", array('%name' => $account->name)));

    if (($account->uid == $user->uid) && user_access('edit own blog')) {
      $output = '<li>'. l(t('Post new blog entry.'), "node/add/blog") .'</li>';
    }
    else if ($account->uid == $user->uid) {
      $output = '<li>'. t('You are not allowed to post a new blog entry.') .'</li>';
    }

    if ($output) {
      $output = '<ul>'. $output .'</ul>';
    }
    else {
      $output = '';
    }

    $result = pager_query(db_rewrite_sql("SELECT n.nid, n.sticky, n.created FROM {node} n WHERE type = 'blog' AND n.uid = %d AND n.status = 1 ORDER BY n.sticky DESC, n.created DESC"), variable_get('default_nodes_main', 10), 0, NULL, $account->uid);
    while ($node = db_fetch_object($result)) {
      $output .= node_view(node_load(array('nid' => $node->nid)), 1);
    }
    $output .= theme('pager', NULL, variable_get('default_nodes_main', 10));
    $output .= theme('xml_icon', url("blog/$account->uid/feed"));

    drupal_add_link(array('rel' => 'alternate',
                          'type' => 'application/rss+xml',
                          'title' => t('RSS - %title', array('%title' => $title)),
                          'href' => url("blog/$account->uid/feed")));
    print theme('page', $output);
  }
  else {
    drupal_not_found();
  }
}

/**
 * Displays a Drupal page containing recent blog entries of all users.
 */
function blog_page_last() {
  global $user;

  $output = '';

  $result = pager_query(db_rewrite_sql("SELECT n.nid, n.created FROM {node} n WHERE n.type = 'blog' AND n.status = 1 ORDER BY n.created DESC"), variable_get('default_nodes_main', 10));

  while ($node = db_fetch_object($result)) {
    $output .= node_view(node_load(array('nid' => $node->nid)), 1);
  }
  $output .= theme('pager', NULL, variable_get('default_nodes_main', 10));
  $output .= theme('xml_icon', url('blog/feed'));

  drupal_add_link(array('rel' => 'alternate',
                        'type' => 'application/rss+xml',
                        'title' => t('RSS - blogs'),
                        'href' => url("blog/feed")));
  print theme('page', $output);
}

/**
 * Implementation of hook_form().
 */
function blog_form(&$node) {
  global $nid;
  $iid = $_GET['iid'];

  if (empty($node->body)) {
    /*
    ** If the user clicked a "blog it" link, we load the data from the
    ** database and quote it in the blog:
    */

    if ($nid && $blog = node_load(array('nid' => $nid))) {
      $node->body = '<em>'. $blog->body .'</em> ['. l($blog->name, "node/$nid") .']';
    }

    if ($iid && $item = db_fetch_object(db_query('SELECT i.*, f.title as ftitle, f.link as flink FROM {aggregator_item} i, {aggregator_feed} f WHERE i.iid = %d AND i.fid = f.fid', $iid))) {
      $node->title = $item->title;
      // Note: $item->description has been validated on aggregation.
      $node->body = '<a href="'. check_url($item->link) .'">'. check_plain($item->title) .'</a> - <em>'. $item->description .'</em> [<a href="'. check_url($item->flink) .'">'. check_plain($item->ftitle) ."</a>]\n";
    }
  }

  if (function_exists('taxonomy_node_form')) {
    $output .= implode('', taxonomy_node_form('blog', $node));
  }

  $output .= form_textarea(t('Body'), 'body', $node->body, 60, 20, '', NULL, TRUE);
  $output .= filter_form('format', $node->format);

  return $output;
}

/**
 * Implementation of hook_view().
 */
function blog_view(&$node, $teaser = FALSE, $page = FALSE) {
  if ($page) {
    // Breadcrumb navigation
    $breadcrumb[] = array('path' => 'blog', 'title' => t('blogs'));
    $breadcrumb[] = array('path' => 'blog/'. $node->uid, 'title' => t("%name's blog", array('%name' => $node->name)));
    $breadcrumb[] = array('path' => 'node/'. $node->nid);
    menu_set_location($breadcrumb);
  }
  $node = node_prepare($node, $teaser);;
}

/**
 * Implementation of hook_link().
 */
function blog_link($type, $node = 0, $main = 0) {
  $links = array();

  if ($type == 'node' && $node->type == 'blog') {
    if (arg(0) != 'blog' || arg(1) != $node->uid) {
      $links[] = l(t("%username's blog", array('%username' => $node->name)), "blog/$node->uid", array('title' => t("Read %username's latest blog entries.", array('%username' => $node->name))));
    }
  }

  return $links;
}

/**
 * Implementation of hook_menu().
 */
function blog_menu($may_cache) {
  global $user;
  $items = array();

  if ($may_cache) {
    $items[] = array('path' => 'node/add/blog', 'title' => t('blog entry'),
      'access' => user_access('edit own blog'));
    $items[] = array('path' => 'blog', 'title' => t('blogs'),
      'callback' => 'blog_page',
      'access' => user_access('access content'),
      'type' => MENU_SUGGESTED_ITEM);
    $items[] = array('path' => 'blog/'. $user->uid, 'title' => t('my blog'),
      'access' => user_access('edit own blog'),
      'type' => MENU_DYNAMIC_ITEM);
  }

  return $items;
}

/**
 * Implementation of hook_block().
 *
 * Displays the most recent 10 blog titles.
 */
function blog_block($op = 'list', $delta = 0) {
  global $user;
  if ($op == 'list') {
    $block[0]['info'] = t('Recent blog posts');
    return $block;
  }
  else if ($op == 'view') {
    if (user_access('access content')) {
      $block['content'] = node_title_list(db_query_range(db_rewrite_sql("SELECT n.nid, n.title, n.created FROM {node} n WHERE n.type = 'blog' AND n.status = 1 ORDER BY n.created DESC"), 0, 10));
      $block['content'] .= '<div class="more-link">'. l(t('more'), 'blog', array('title' => t('Read the latest blog entries.'))) .'</div>';
      $block['subject'] = t('Recent blog posts');
    }
    return $block;
  }
}

?>