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<?php
/**
 * Plugin Name: Breadcumbs Plus
 * Plugin URI: http://snippets-tricks.org/proyectos/breadcrumbs-plus-plugin/
 * Description: Breadcrumbs Plus provide links back to each previous page the user navigated through to get to the current page or-in hierarchical site structures-the parent pages of the current one.
 * Version: 0.3
 * Author: Luis Alberto Ochoa
 * Author URI: http://luisalberto.org
 * License: GPL2
 * 
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU 
 * General Public License version 2, as published by the Free Software Foundation.  You may NOT assume 
 * that you can use any other version of the GPL.
 *
 * 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.
 *
 * 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
 * 
 * @package Breadcrumbs Plus
 * @version 0.3
 * @author Luis Alberto Ochoa <soy@luisalberto.org>
 * @copyright Copyright (c) 2010, Luis Alberto Ochoa
 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */

/**
 * Poedit is a good tool to for translating.
 * 
 * @link http://poedit.net
 * @since 0.1
 */
load_plugin_textdomain( 'breadcrumbs-plus', false, 'breadcrumbs-plus/languages' );

/**
 * Shows a breadcrumb for all types of pages.
 *
 * @since 0.1
 * @param array $args
 * @return string
 */
 
function breadcrumbs_plus( $args = '' ) {
	global $wp_query;

/* Set up the default arguments for the breadcrumb. */
	$defaults = array(
		'prefix' => '<p>',
		'suffix' => '</p>',
		'title' => __( 'You are here: ', 'care' ),
		'home' => __( 'Home', 'care' ),
		'sep' => '&nbsp;/&nbsp;',
		'front_page' => false,
		'bold' => false,
		'show_blog' => true,
		'singular_post_taxonomy' => 'category',
		'echo' => true
	);

$args = apply_filters( 'breadcrumbs_plus_args', $args );

$args = wp_parse_args( $args, $defaults );
	
	if (get_option_tree('disable_breadcrumbs', '')) {}
	else{

if ( is_front_page() && !$args['front_page'] )
		return apply_filters( 'breadcrumbs_plus', false );

$html = '';
		
	/* Format the separator. */
	$separator = ( !empty( $args['sep'] ) ? ' <span class="breadcrumbs-separator">' . $args['sep'] . '</span> ' : ' <span class="breadcrumbs-separator">/</span> ' );

$show_on_front = get_option('show_on_front');

$home = '<a href="'. home_url( '/' ) .'" rel="home" class="breadcrumbs-begin">' . $args['home'] . '</a>';

if ( 'page' == $show_on_front && $args['show_blog'] )
		$bloglink = $home . $separator . '<a href="' . get_permalink( get_option( 'page_for_posts' ) ) . '">' . get_the_title( get_option( 'page_for_posts' ) ) . '</a>';

else
		$bloglink = $home;
	
	if ( is_front_page() )
		$html .= _bold_( $home, $args['bold'] );
	
	elseif ( is_home() )
		$html .= $home . $separator . _bold_( get_the_title( get_option( 'page_for_posts' ) ), $args['bold'] );

/* If viewing a singular post. */
	elseif ( is_singular() ) {
		$post_id = (int) $wp_query->get_queried_object_id();

if ( 'page' === $wp_query->post->post_type )
			$html .= $home . $separator;

elseif ( 'page' !== $wp_query->post->post_type ) {
			$html .= $bloglink . $separator;

if ( isset( $args["singular_{$wp_query->post->post_type}_taxonomy"] ) && is_taxonomy_hierarchical( $args["singular_{$wp_query->post->post_type}_taxonomy"] ) ) {
				$terms = wp_get_object_terms( $post_id, $args["singular_{$wp_query->post->post_type}_taxonomy"] );
				$html .= breadcrumbs_plus_get_term_parents( $terms[0], $args["singular_{$wp_query->post->post_type}_taxonomy"], $separator ) . $separator;
			}

elseif ( isset( $args["singular_{$wp_query->post->post_type}_taxonomy"] ) )
				$html .= get_the_term_list( $post_id, $args["singular_{$wp_query->post->post_type}_taxonomy"], '', ', ', '' ) . $separator;
		}

if ( ( is_post_type_hierarchical( $wp_query->post->post_type ) || 'attachment' === $wp_query->post->post_type ) && $parents = breadcrumbs_plus_get_parents( $wp_query->post->post_parent, $separator ) )
			$html .= $parents . $separator;

$html .= _bold_( get_the_title(), $args['bold'] );
	}

/* If viewing any type of archive. */
	elseif ( is_archive() ) {

$html .= $bloglink . $separator;

if ( is_category() || is_tag() || is_tax() ) {

$term = $wp_query->get_queried_object();
			$taxonomy = get_taxonomy( $term->taxonomy );

if ( ( is_taxonomy_hierarchical( $term->taxonomy ) && $term->parent ) && $parents = breadcrumbs_plus_get_term_parents( $term->parent, $term->taxonomy, $separator ) )
				$html .= $parents . $separator;

$html .= _bold_( $term->name, $args['bold'] );
		}

elseif ( function_exists( 'is_post_type_archive' ) && is_post_type_archive() ) {
			$post_type_object = get_post_type_object( get_query_var( 'post_type' ) );
			$html .= _bold_( $post_type_object->labels->name, $args['bold'] );
		}

elseif ( is_date() ) {

if ( is_day() )
				$html .= _bold_( __( 'Archives for ', 'breadcrumbs-plus' ) . get_the_time( 'F j, Y' ), $args['bold'] );
			
			elseif ( is_month() )
				$html .= _bold_( __( 'Archives for ', 'breadcrumbs-plus' ) . single_month_title( ' ', false ), $args['bold'] );
					
			elseif ( is_year() )
				$html .= _bold_( __( 'Archives for ', 'breadcrumbs-plus' ) . get_the_time( 'Y' ), $args['bold'] );
		}

elseif ( is_author() )
			$html .= _bold_( __( 'Archives by: ', 'breadcrumbs-plus' ) . get_the_author_meta( 'display_name', $wp_query->post->post_author ), $args['bold'] );
	}

/* If viewing search results. */
	elseif ( is_search() )
		$html .= $home . $separator . _bold_( __( 'Search results for "', 'breadcrumbs-plus' ) . stripslashes( strip_tags( get_search_query() ) ) . '"', $args['bold'] );

/* If viewing a 404 error page. */
	elseif ( is_404() )
		$html .= $home . $separator . _bold_( __( 'Page Not Found', 'breadcrumbs-plus' ), $args['bold'] );

$breadcrumbs = '<div class="breadcrumbs">';
	$breadcrumbs .= $html;
	$breadcrumbs .= '</div>';

$breadcrumbs = apply_filters( 'breadcrumbs_plus', $breadcrumbs );

if ( !$args['echo'] )
		return $breadcrumbs;

echo $breadcrumbs;
}
}

/**
 * Gets parent pages of any post type.
 *
 * @since 0.3
 * @param int $post_id ID of the post whose parents we want.
 * @param string $separator.
 * @return string $html String of parent page links.
 */
function breadcrumbs_plus_get_parents( $post_id = '', $separator = '/' ) {

$html = array();

if ( $post_id == 0 )
		return;

while ( $post_id ) {
		$page = get_page( $post_id );
		$parents[]  = '<a href="' . get_permalink( $post_id ) . '" title="' . esc_attr( get_the_title( $post_id ) ) . '">' . get_the_title( $post_id ) . '</a>';
		$post_id = $page->post_parent;
	}

if ( $parents )
		$html = array_reverse( $parents );

return join( $separator, $html );
}

/**
 * Searches for term parents of hierarchical taxonomies.
 *
 * @since 0.3
 * @param int $parent_id The ID of the first parent.
 * @param object|string $taxonomy The taxonomy of the term whose parents we want.
 * @return string $html String of links to parent terms.
 */
function breadcrumbs_plus_get_term_parents( $parent_id = '', $taxonomy = '', $separator = '/' ) {

$html = array();
	$parents = array();

if ( empty( $parent_id ) || empty( $taxonomy ) )
		return;

while ( $parent_id ) {
		$parent = get_term( $parent_id, $taxonomy );
		$parents[] = '<a href="' . get_term_link( $parent, $taxonomy ) . '" title="' . esc_attr( $parent->name ) . '">' . $parent->name . '</a>';
		$parent_id = $parent->parent;
	}

if ( $parents )
		$html = array_reverse( $parents );

return join( $separator, $html );
}

/**
 * Return a Input with <strong> tag.
 *
 * @since 0.1
 * @return string
 */
function _bold_( $input, $bold ) {
	if ( $bold )
		return '<strong>'. $input . '</strong>';

return $input;
}

/**
 * Try to add automatically to Hybrid, Thematic, Thesis or Genesis
 *
 * @since 0.1
 * @return string
 */
add_action( 'after_setup_theme', 'setup_breadcrumbs_plus' );

function setup_breadcrumbs_plus() {

/* Hybrid */
	remove_action( 'hybrid_before_content', 'hybrid_breadcrumb' );
	add_action( 'hybrid_before_content', 'breadcrumbs_plus' );

/* Thematic */
	add_action( 'thematic_belowheader','breadcrumbs_plus' );

/* Thesis */
	add_action( 'thesis_hook_before_content','breadcrumbs_plus' );

/* Genesis */
	remove_action( 'genesis_before_loop', 'genesis_do_breadcrumbs' );
	add_action( 'genesis_before_loop', 'breadcrumbs_plus' );
}