template-functions-links.php

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function get_next_post($in_same_cat = false, $excluded_categories = '') {
	global $post, $wpdb;

	if( !is_single() || is_attachment() )
		return null;

	$current_post_date = $post->post_date;
	
	$join = '';
	if ( $in_same_cat ) {
		$join = " INNER JOIN $wpdb->post2cat ON $wpdb->posts.ID= $wpdb->post2cat.post_id ";
		$cat_array = get_the_category($post->ID);
		$join .= ' AND (category_id = ' . intval($cat_array[0]->cat_ID);
		for ( $i = 1; $i < (count($cat_array)); $i++ ) {
			$join .= ' OR category_id = ' . intval($cat_array[$i]->cat_ID);
		}
		$join .= ')'; 
	}

	$sql_exclude_cats = '';
	if ( !empty($excluded_categories) ) {
		$blah = explode('and', $excluded_categories);
		foreach ( $blah as $category ) {
			$category = intval($category);
			$sql_exclude_cats .= " AND post_category != $category";
		}
	}

	$now = current_time('mysql');
	
	return @$wpdb->get_row("SELECT ID,post_title FROM $wpdb->posts $join WHERE post_date > '$current_post_date' AND post_date < '$now' AND post_status = 'publish' " . ( empty($GLOBALS["wp_xoops_author"])? "" : " AND post_author = " . intval($GLOBALS["wp_xoops_author"]) ) . " $sqlcat $sql_exclude_cats AND ID != $post->ID ORDER BY post_date ASC LIMIT 1");
}


function previous_post_link($format='&laquo; %link', $link='%title', $in_same_cat = false, $excluded_categories = '') {

	if ( is_attachment() )
		$post = & get_post($GLOBALS['post']->post_parent);
	else
		$post = get_previous_post($in_same_cat, $excluded_categories);

	if ( !$post )
		return;

	$title = apply_filters('the_title', $post->post_title, $post);
	$string = '<a href="'.get_permalink($post->ID).'">';
	$link = str_replace('%title', $title, $link);
	$link = $pre . $string . $link . '</a>';

	$format = str_replace('%link', $link, $format);

	echo $format;	    
}

function next_post_link($format='%link &raquo;', $link='%title', $in_same_cat = false, $excluded_categories = '') {
	$post = get_next_post($in_same_cat, $excluded_categories);

	if ( !$post )
		return;

	$title = apply_filters('the_title', $post->post_title, $post);
	$string = '<a href="'.get_permalink($post->ID).'">';
	$link = str_replace('%title', $title, $link);
	$link = $string . $link . '</a>';
	$format = str_replace('%link', $link, $format);

	echo $format;	    
}


// Deprecated.	Use previous_post_link().
function previous_post($format='%', $previous='previous post: ', $title='yes', $in_same_cat='no', $limitprev=1, $excluded_categories='') {

	if ( empty($in_same_cat) || 'no' == $in_same_cat )
		$in_same_cat = false;
	else
		$in_same_cat = true;

	$post = get_previous_post($in_same_cat, $excluded_categories);

	if ( !$post )
		return;

	$string = '<a href="'.get_permalink($post->ID).'">'.$previous;
	if ( 'yes' == $title )
		$string .= apply_filters('the_title', $post->post_title, $post);
	$string .= '</a>';
	$format = str_replace('%', $string, $format);
	echo $format;
}

// Deprecated.	Use next_post_link().
function next_post($format='%', $next='next post: ', $title='yes', $in_same_cat='no', $limitnext=1, $excluded_categories='') {

	if ( empty($in_same_cat) || 'no' == $in_same_cat )
		$in_same_cat = false;
	else
		$in_same_cat = true;

	$post = get_next_post($in_same_cat, $excluded_categories);

	if ( !$post	)
		return;

	$string = '<a href="'.get_permalink($post->ID).'">'.$next;
	if ( 'yes' == $title )
		$string .= apply_filters('the_title', $post->post_title, $nextpost);
	$string .= '</a>';
	$format = str_replace('%', $string, $format);
	echo $format;
}

function get_pagenum_link($pagenum = 1) {
	global $wp_rewrite;

	$qstr = wp_specialchars($_SERVER['REQUEST_URI']);

	$page_querystring = "paged"; 
	$page_modstring = "page/";
	$page_modregex = "page/?";
	$permalink = 0;

	$home_root = parse_url(get_settings('home'));
	$home_root = $home_root['path'];
	$home_root = trailingslashit($home_root);
	$qstr = preg_replace('|^'. $home_root . '|', '', $qstr);
	$qstr = preg_replace('|^/+|', '', $qstr);

	$index = $_SERVER['PHP_SELF'];
	$index = preg_replace('|^'. $home_root . '|', '', $index);
	$index = preg_replace('|^/+|', '', $index);

	// if we already have a QUERY style page string
	if ( stristr( $qstr, $page_querystring ) ) {
		$replacement = "$page_querystring=$pagenum";
		$qstr = preg_replace("/".$page_querystring."[^\d]+\d+/", $replacement, $qstr);
		// if we already have a mod_rewrite style page string
	} elseif ( preg_match( '|'.$page_modregex.'\d+|', $qstr ) ) {
		$permalink = 1;
		$qstr = preg_replace('|'.$page_modregex.'\d+|',"$page_modstring$pagenum",$qstr);

		// if we don't have a page string at all ...
		// lets see what sort of URL we have...
	} else {
		// we need to know the way queries are being written
		// if there's a querystring_start (a "?" usually), it's definitely not mod_rewritten
		if ( stristr( $qstr, '?' ) ) {
			// so append the query string (using &, since we already have ?)
			$qstr .=	'&amp;' . $page_querystring . '=' . $pagenum;
			// otherwise, it could be rewritten, OR just the default index ...
		} elseif( '' != get_settings('permalink_structure') && ! is_admin() ) {
			$permalink = 1;
			$index = $wp_rewrite->index;
			// If it's not a path info permalink structure, trim the index.
			if ( !$wp_rewrite->using_index_permalinks() ) {
				$qstr = preg_replace("#/*" . $index . "/*#", '/', $qstr);
			} else {
				// If using path info style permalinks, make sure the index is in
				// the URI.
				if ( strpos($qstr, $index) === false )
					$qstr = '/' . $index . $qstr;
			}

			$qstr =	trailingslashit($qstr) . $page_modstring . $pagenum;
		} else {
			$qstr = $index . '?' . $page_querystring . '=' . $pagenum;
		}
	}

	$qstr = preg_replace('|^/+|', '', $qstr);
	if ( $permalink )
		$qstr = trailingslashit($qstr);
	$qstr = preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', trailingslashit( get_settings('home') ) . $qstr );
	
	// showing /page/1/ or ?paged=1 is redundant
	if ( 1 === $pagenum ) {
		$qstr = str_replace('page/1/', '', $qstr); // for mod_rewrite style
		$qstr = remove_query_arg('paged', $qstr); // for query style
	}
	return $qstr;
}

function next_posts($max_page = 0) { // original by cfactor at cooltux.org
	global $paged, $pagenow;

	if ( !is_single() ) {
		if ( !$paged )
			$paged = 1;
		$nextpage = intval($paged) + 1;
		if ( !$max_page || $max_page >= $nextpage )
			echo get_pagenum_link($nextpage);
	}
}

function next_posts_link($label='Next Page &raquo;', $max_page=0) {
	global $paged, $result, $request, $posts_per_page, $wpdb, $max_num_pages;
	if ( !$max_page ) {
			if ( isset($max_num_pages) ) {
				$max_page = $max_num_pages;
			} else {
				preg_match('#FROM\s(.*)\sGROUP BY#siU', $request, $matches);
				$fromwhere = $matches[1];
				$numposts = $wpdb->get_var("SELECT COUNT(DISTINCT ID) FROM $fromwhere");
				$max_page = $max_num_pages = ceil($numposts / $posts_per_page);
			}
	}
	if ( !$paged )
		$paged = 1;
	$nextpage = intval($paged) + 1;
	if ( (! is_single()) && (empty($paged) || $nextpage <= $max_page) ) {
		echo '<a href="';
		next_posts($max_page);
		echo '">'. preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', $label) .'</a>';
	}
}


function previous_posts() { // original by cfactor at cooltux.org
	global $paged, $pagenow;

	if ( !is_single() ) {
		$nextpage = intval($paged) - 1;
		if ( $nextpage < 1 )
			$nextpage = 1;
		echo get_pagenum_link($nextpage);
	}
}


function previous_posts_link($label='&laquo; Previous Page') {
	global $paged;
	if ( (!is_single())	&& ($paged > 1) ) {
		echo '<a href="';
		previous_posts();
		echo '">'. preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', $label) .'</a>';
	}
}

function posts_nav_link($sep=' &#8212; ', $prelabel='&laquo; Previous Page', $nxtlabel='Next Page &raquo;') {
	global $request, $posts_per_page, $wpdb, $max_num_pages;
	if ( !is_single() ) {

		if ( 'posts' == get_query_var('what_to_show') ) {
			if ( !isset($max_num_pages) ) {
				preg_match('#FROM\s(.*)\sGROUP BY#siU', $request, $matches);
				$fromwhere = $matches[1];
				$numposts = $wpdb->get_var("SELECT COUNT(DISTINCT ID) FROM $fromwhere");
				$max_num_pages = ceil($numposts / $posts_per_page);
			}
		} else {
			$max_num_pages = 999999;
		}

		if ( $max_num_pages > 1 ) {
			previous_posts_link($prelabel);
			echo preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', $sep);
			next_posts_link($nxtlabel, $max_page);
		}
	}
}

?>