<?php

/**

 * WordPress Link Template Functions

 *

 * @package WordPress

 * @subpackage Template

 */

/**

 * Display the permalink for the current post.

 *

 * @since 1.2.0

 * @uses apply_filters() Calls 'the_permalink' filter on the permalink string.

 */

function the_permalink() {

	echo apply_filters('the_permalink', get_permalink());

}

/**

 * Retrieve trailing slash string, if blog set for adding trailing slashes.

 *

 * Conditionally adds a trailing slash if the permalink structure has a trailing

 * slash, strips the trailing slash if not. The string is passed through the

 * 'user_trailingslashit' filter. Will remove trailing slash from string, if

 * blog is not set to have them.

 *

 * @since 2.2.0

 * @uses $wp_rewrite

 *

 * @param string $string URL with or without a trailing slash.

 * @param string $type_of_url The type of URL being considered (e.g. single, category, etc) for use in the filter.

 * @return string

 */

function user_trailingslashit($string, $type_of_url = '') {

	global $wp_rewrite;

	if ( $wp_rewrite->use_trailing_slashes )

		$string = trailingslashit($string);

	else

		$string = untrailingslashit($string);

	// Note that $type_of_url can be one of following:

	// single, single_trackback, single_feed, single_paged, feed, category, page, year, month, day, paged, post_type_archive

	$string = apply_filters('user_trailingslashit', $string, $type_of_url);

	return $string;

}

/**

 * Display permalink anchor for current post.

 *

 * The permalink mode title will use the post title for the 'a' element 'id'

 * attribute. The id mode uses 'post-' with the post ID for the 'id' attribute.

 *

 * @since 0.71

 *

 * @param string $mode Permalink mode can be either 'title', 'id', or default, which is 'id'.

 */

function permalink_anchor( $mode = 'id' ) {

	$post = get_post();

	switch ( strtolower( $mode ) ) {

		case 'title':

			$title = sanitize_title( $post->post_title ) . '-' . $post->ID;

			echo '<a id="'.$title.'"></a>';

			break;

		case 'id':

		default:

			echo '<a id="post-' . $post->ID . '"></a>';

			break;

	}

}

/**

 * Retrieve full permalink for current post or post ID.

 *

 * @since 1.0.0

 *

 * @param int $id Optional. Post ID.

 * @param bool $leavename Optional, defaults to false. Whether to keep post name or page name.

 * @return string

 */

function get_permalink( $id = 0, $leavename = false ) {

	$rewritecode = array(

		'%year%',

		'%monthnum%',

		'%day%',

		'%hour%',

		'%minute%',

		'%second%',

		$leavename? '' : '%postname%',

		'%post_id%',

		'%category%',

		'%author%',

		$leavename? '' : '%pagename%',

	);

	if ( is_object($id) && isset($id->filter) && 'sample' == $id->filter ) {

		$post = $id;

		$sample = true;

	} else {

		$post = get_post($id);

		$sample = false;

	}

	if ( empty($post->ID) )

		return false;

	if ( $post->post_type == 'page' )

		return get_page_link($post->ID, $leavename, $sample);

	elseif ( $post->post_type == 'attachment' )

		return get_attachment_link( $post->ID, $leavename );

	elseif ( in_array($post->post_type, get_post_types( array('_builtin' => false) ) ) )

		return get_post_permalink($post->ID, $leavename, $sample);

	$permalink = get_option('permalink_structure');

	$permalink = apply_filters('pre_post_link', $permalink, $post, $leavename);

	if ( '' != $permalink && !in_array($post->post_status, array('draft', 'pending', 'auto-draft')) ) {

		$unixtime = strtotime($post->post_date);

		$category = '';

		if ( strpos($permalink, '%category%') !== false ) {

			$cats = get_the_category($post->ID);

			if ( $cats ) {

				usort($cats, '_usort_terms_by_ID'); // order by ID

				$category_object = apply_filters( 'post_link_category', $cats[0], $cats, $post );

				$category_object = get_term( $category_object, 'category' );

				$category = $category_object->slug;

				if ( $parent = $category_object->parent )

					$category = get_category_parents($parent, false, '/', true) . $category;

			}

			// show default category in permalinks, without

			// having to assign it explicitly

			if ( empty($category) ) {

				$default_category = get_category( get_option( 'default_category' ) );

				$category = is_wp_error( $default_category ) ? '' : $default_category->slug;

			}

		}

		$author = '';

		if ( strpos($permalink, '%author%') !== false ) {

			$authordata = get_userdata($post->post_author);

			$author = $authordata->user_nicename;

		}

		$date = explode(" ",date('Y m d H i s', $unixtime));

		$rewritereplace =

		array(

			$date[0],

			$date[1],

			$date[2],

			$date[3],

			$date[4],

			$date[5],

			$post->post_name,

			$post->ID,

			$category,

			$author,

			$post->post_name,

		);

		$permalink = home_url( str_replace($rewritecode, $rewritereplace, $permalink) );

		$permalink = user_trailingslashit($permalink, 'single');

	} else { // if they're not using the fancy permalink option

		$permalink = home_url('?p=' . $post->ID);

	}

	return apply_filters('post_link', $permalink, $post, $leavename);

}

/**

 * Retrieve the permalink for a post with a custom post type.

 *

 * @since 3.0.0

 *

 * @param int $id Optional. Post ID.

 * @param bool $leavename Optional, defaults to false. Whether to keep post name.

 * @param bool $sample Optional, defaults to false. Is it a sample permalink.

 * @return string

 */

function get_post_permalink( $id = 0, $leavename = false, $sample = false ) {

	global $wp_rewrite;

	$post = get_post($id);

	if ( is_wp_error( $post ) )

		return $post;

	$post_link = $wp_rewrite->get_extra_permastruct($post->post_type);

	$slug = $post->post_name;

	$draft_or_pending = isset($post->post_status) && in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft' ) );

	$post_type = get_post_type_object($post->post_type);

	if ( !empty($post_link) && ( !$draft_or_pending || $sample ) ) {

		if ( ! $leavename ) {

			if ( $post_type->hierarchical )

				$slug = get_page_uri($id);

			$post_link = str_replace("%$post->post_type%", $slug, $post_link);

		}

		$post_link = home_url( user_trailingslashit($post_link) );

	} else {

		if ( $post_type->query_var && ( isset($post->post_status) && !$draft_or_pending ) )

			$post_link = add_query_arg($post_type->query_var, $slug, '');

		else

			$post_link = add_query_arg(array('post_type' => $post->post_type, 'p' => $post->ID), '');

		$post_link = home_url($post_link);

	}

	return apply_filters('post_type_link', $post_link, $post, $leavename, $sample);

}

/**

 * Retrieve permalink from post ID.

 *

 * @since 1.0.0

 *

 * @param int $post_id Optional. Post ID.

 * @param mixed $deprecated Not used.

 * @return string

 */

function post_permalink( $post_id = 0, $deprecated = '' ) {

	if ( !empty( $deprecated ) )

		_deprecated_argument( __FUNCTION__, '1.3' );

	return get_permalink($post_id);

}

/**

 * Retrieve the permalink for current page or page ID.

 *

 * Respects page_on_front. Use this one.

 *

 * @since 1.5.0

 *

 * @param mixed $post Optional. Post ID or object.

 * @param bool $leavename Optional, defaults to false. Whether to keep page name.

 * @param bool $sample Optional, defaults to false. Is it a sample permalink.

 * @return string

 */

function get_page_link( $post = false, $leavename = false, $sample = false ) {

	$post = get_post( $post );

	if ( 'page' == get_option( 'show_on_front' ) && $post->ID == get_option( 'page_on_front' ) )

		$link = home_url('/');

	else

		$link = _get_page_link( $post, $leavename, $sample );

	return apply_filters( 'page_link', $link, $post->ID, $sample );

}

/**

 * Retrieve the page permalink.

 *

 * Ignores page_on_front. Internal use only.

 *

 * @since 2.1.0

 * @access private

 *

 * @param mixed $post Optional. Post ID or object.

 * @param bool $leavename Optional. Leave name.

 * @param bool $sample Optional. Sample permalink.

 * @return string

 */

function _get_page_link( $post = false, $leavename = false, $sample = false ) {

	global $wp_rewrite;

	$post = get_post( $post );

	$draft_or_pending = in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft' ) );

	$link = $wp_rewrite->get_page_permastruct();

	if ( !empty($link) && ( ( isset($post->post_status) && !$draft_or_pending ) || $sample ) ) {

		if ( ! $leavename ) {

			$link = str_replace('%pagename%', get_page_uri( $post ), $link);

		}

		$link = home_url($link);

		$link = user_trailingslashit($link, 'page');

	} else {

		$link = home_url( '?page_id=' . $post->ID );

	}

	return apply_filters( '_get_page_link', $link, $post->ID );

}

/**

 * Retrieve permalink for attachment.

 *

 * This can be used in the WordPress Loop or outside of it.

 *

 * @since 2.0.0

 *

 * @param mixed $post Optional. Post ID or object.

 * @param bool $leavename Optional. Leave name.

 * @return string

 */

function get_attachment_link( $post = null, $leavename = false ) {

	global $wp_rewrite;

	$link = false;

	$post = get_post( $post );

	if ( $wp_rewrite->using_permalinks() && ( $post->post_parent > 0 ) && ( $post->post_parent != $post->ID ) ) {

		$parent = get_post($post->post_parent);

		if ( 'page' == $parent->post_type )

			$parentlink = _get_page_link( $post->post_parent ); // Ignores page_on_front

		else

			$parentlink = get_permalink( $post->post_parent );

		if ( is_numeric($post->post_name) || false !== strpos(get_option('permalink_structure'), '%category%') )

			$name = 'attachment/' . $post->post_name; // <permalink>/<int>/ is paged so we use the explicit attachment marker

		else

			$name = $post->post_name;

		if ( strpos($parentlink, '?') === false )

			$link = user_trailingslashit( trailingslashit($parentlink) . '%postname%' );

		if ( ! $leavename )

			$link = str_replace( '%postname%', $name, $link );

	}

	if ( ! $link )

		$link = home_url( '/?attachment_id=' . $post->ID );

	return apply_filters( 'attachment_link', $link, $post->ID );

}

/**

 * Retrieve the permalink for the year archives.

 *

 * @since 1.5.0

 *

 * @param int|bool $year False for current year or year for permalink.

 * @return string

 */

function get_year_link($year) {

	global $wp_rewrite;

	if ( !$year )

		$year = gmdate('Y', current_time('timestamp'));

	$yearlink = $wp_rewrite->get_year_permastruct();

	if ( !empty($yearlink) ) {

		$yearlink = str_replace('%year%', $year, $yearlink);

		return apply_filters('year_link', home_url( user_trailingslashit($yearlink, 'year') ), $year);

	} else {

		return apply_filters('year_link', home_url('?m=' . $year), $year);

	}

}

/**

 * Retrieve the permalink for the month archives with year.

 *

 * @since 1.0.0

 *

 * @param bool|int $year False for current year. Integer of year.

 * @param bool|int $month False for current month. Integer of month.

 * @return string

 */

function get_month_link($year, $month) {

	global $wp_rewrite;

	if ( !$year )

		$year = gmdate('Y', current_time('timestamp'));

	if ( !$month )

		$month = gmdate('m', current_time('timestamp'));

	$monthlink = $wp_rewrite->get_month_permastruct();

	if ( !empty($monthlink) ) {

		$monthlink = str_replace('%year%', $year, $monthlink);

		$monthlink = str_replace('%monthnum%', zeroise(intval($month), 2), $monthlink);

		return apply_filters('month_link', home_url( user_trailingslashit($monthlink, 'month') ), $year, $month);

	} else {

		return apply_filters('month_link', home_url( '?m=' . $year . zeroise($month, 2) ), $year, $month);

	}

}

/**

 * Retrieve the permalink for the day archives with year and month.

 *

 * @since 1.0.0

 *

 * @param bool|int $year False for current year. Integer of year.

 * @param bool|int $month False for current month. Integer of month.

 * @param bool|int $day False for current day. Integer of day.

 * @return string

 */

function get_day_link($year, $month, $day) {

	global $wp_rewrite;

	if ( !$year )

		$year = gmdate('Y', current_time('timestamp'));

	if ( !$month )

		$month = gmdate('m', current_time('timestamp'));

	if ( !$day )

		$day = gmdate('j', current_time('timestamp'));

	$daylink = $wp_rewrite->get_day_permastruct();

	if ( !empty($daylink) ) {

		$daylink = str_replace('%year%', $year, $daylink);

		$daylink = str_replace('%monthnum%', zeroise(intval($month), 2), $daylink);

		$daylink = str_replace('%day%', zeroise(intval($day), 2), $daylink);

		return apply_filters('day_link', home_url( user_trailingslashit($daylink, 'day') ), $year, $month, $day);