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<?php
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// $Id: comment_count_image.module,v 1.1 2008/10/12 21:04:03 jpetso Exp $
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/**
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* @file
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* Comment Count Image - Adds a dynamically-generated image to RSS feed items
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* that shows the number of comments on that node.
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*
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* Copyright 2008 by Jakob Petsovits ("jpetso", http://drupal.org/user/56020)
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*/
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/**
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* Implementation of hook_menu().
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*/
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function comment_count_image_menu() {
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$items = array();
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$items['system/files/comment-count-image/%node/node-comments.png'] = array(
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'title' => 'Comment Count Image',
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'page callback' => 'comment_count_image_download',
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'page arguments' => array(3),
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'access arguments' => array('access comments'),
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'type' => MENU_CALLBACK,
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);
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$items['comment-count-image/go/node/%node'] = array(
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'title' => 'Comments',
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'page callback' => 'comment_count_image_goto',
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'page arguments' => array(3),
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'access arguments' => array('access comments'),
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'type' => MENU_CALLBACK,
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);
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return $items;
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}
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/**
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* Some feed readers, or at least Akregator (preferred feed reader of this
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* module's initial author), don't open links with fragments. So instead of
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* linking to the comments directly, we redirect to those.
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* (Wordpress does it the same way, btw.)
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*/
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function comment_count_image_goto($node) {
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return drupal_goto('node/'. $node->nid, NULL, 'comments');
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}
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/**
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* Implementation of hook_nodeapi().
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*/
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function comment_count_image_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
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switch ($op) {
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case 'rss item':
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if ($node->comment != COMMENT_NODE_DISABLED && user_access('access comments')) {
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$image_menupath = 'system/files/comment-count-image/'. $node->nid .'/node-comments.png';
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$image_url = url($image_menupath, array('absolute' => TRUE));
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$image = theme('comment_count_image', $node, $image_url);
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$node->teaser .= '<p>'. $image .'</p>';
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$node->body .= '<p>'. $image .'</p>';
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}
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return;
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}
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}
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/**
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* Implementation of hook_theme().
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*/
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function comment_count_image_theme($existing, $type, $theme, $path) {
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return array(
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'comment_count_image' => array(
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'arguments' => array('node' => NULL, 'image_url' => NULL),
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),
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);
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}
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/**
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* Theme function, returning the complete markup (with links and stuff)
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* of the comment count image.
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*/
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function theme_comment_count_image($node, $image_url) {
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$image_attributes = array('rel' => 'nofollow', 'style' => 'margin-top: 0.5em;');
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$image_link = l(
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theme('image', $image_url, '', '', $image_attributes, FALSE),
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'comment-count-image/go/node/'. $node->nid,
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array('absolute' => TRUE, 'html' => TRUE)
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);
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// Indent the image a bit, in order to set it apart from the contents.
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return '<span style="margin-left: 1.5em;"> </span>'. $image_link;
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}
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/**
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* Download callback for the image containing the number of comments
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* on the given node.
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*/
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function comment_count_image_download($node) {
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//if (file_check_directory('comment-count-image/node')) {
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$comment_count = empty($node->comment_count) ? 0 : $node->comment_count;
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$image_path = comment_count_real_image_path($comment_count);
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if (is_file($image_path)) {
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$headers = array(
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'Content-Type: '. mime_header_encode('image/png'),
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'Content-Length: '. filesize($image_path),
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);
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file_transfer($image_path, $headers);
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}
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return drupal_not_found();
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}
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/**
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* Return the path of the comment count image, (re-)creating it if necessary.
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* The image has the content type 'image/png'.
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*/
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function comment_count_real_image_path($comment_count) {
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$image_path = file_directory_path() .'/comment-count-image/'. $comment_count .'.png';
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if (!is_file($image_path)) {
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comment_count_image_create($image_path, $comment_count);
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}
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return $image_path;
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}
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/**
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* Create an image at the given path containing the given number of comments.
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* The image has the content type 'image/png'.
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*/
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function comment_count_image_create(&$image_path, $comment_count) {
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if (!file_check_directory(dirname($image_path), FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS)) {
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return FALSE;
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}
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// Create a (black) image.
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$image = @imagecreatetruecolor(95, 15);
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if (!$image) {
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return FALSE;
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}
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imagecolortransparent($image, 0 /* black */); // Set black as transparent.
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$text_color = imagecolorallocate($image, 50, 50, 200); // Blueish text color.
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$comment_count = t('Comments: !n', array('!n' => $comment_count));
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// Render and save the image.
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imagestring($image, 2, 0, 0, $comment_count, $text_color);
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imagepng($image, $image_path, 9 /* highest compression level, still looks good */);
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imagedestroy($image);
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return TRUE;
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}
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