Waves and Rocks Plugin

waves-and-rocks.php

<?php
/**
* Plugin Name: Waves and Rocks
* Description: A Plugin with several Features for my Blog 
* Version: 0.9i
* Author: Benjamin Birkenhake
* Author URI: http://ben.grim.rocks
*/	
	
/*

# Table of Contents

1. All the Hooks for Actions and Filters
2. Admin Field for Custom CSS per Post/Page	
3. Allow Overwrite of first Term-Pages by Pages
	
	
*/


// Add Meta-Boxes
add_action( 'add_meta_boxes', 'waves_and_rocks_add_custom_meta_boxes' );
// Save CSS Box
add_action( 'save_post', 'waves_and_rocks_save_meta_boxes' );
// Add CSS to the Content 
add_filter( 'the_content', 'waves_and_rocks_custom_css_the_content_filter' );

// Add Meta Box to Term-Pages
add_action( 'edit_category_form', 'waves_and_rocks_add_page_for_term_box' );
add_action( 'edit_tag_form', 'waves_and_rocks_add_page_for_term_box' );
add_action( 'edit_terms', 'waves_and_rocks_save_page_for_term', 10, 2 );

// Render the Page within the Term-Description
add_action( 'term_description', 'waves_and_rocks_term_overwrite' );

// Redirect Pages, that are rewrites for Terms
add_action( 'get_header', 'waves_and_rocks_header' );

// Some Debugging-Stuff
add_action('admin_footer', 'waves_and_rocks_findout_screen');

// Add Link to Page Edit
add_action('admin_bar_menu', 'waves_and_rocks_admin_bar_menu', 90);


/* ## MetaBox for CSS */


function waves_and_rocks_add_custom_meta_boxes( $post ) {
    add_meta_box( 
        'waves-and-rocks-meta-box-custom-css',
        __( 'Custom CSS' ),
        'waves_and_rocks_render_meta_box_custom_css',
        array('post', 'page'),
        'normal',
        'default'
    );
}




function waves_and_rocks_render_meta_box_custom_css($post){
	// Add a nonce field so we can check for it later.
	wp_nonce_field( 'waves_and_rocks_save_meta_box_custom_css_data', 'waves_and_rocks_meta_box_custom_css_nonce' );
	
	echo '<textarea name="waves-and-rocks-meta-box-custom-css" style="with:100%;" cols="80" rows="10">';
	echo get_post_meta( $post->ID, "_waves-and-rocks-custom-css", true );
	echo '</textarea>';
	
}
	
	
function waves_and_rocks_save_meta_boxes($post_id){
	
	// Verify that the nonce is valid.
	if ( ! wp_verify_nonce( $_POST['waves_and_rocks_meta_box_custom_css_nonce'], 'waves_and_rocks_save_meta_box_custom_css_data' ) ) {
		return;
	}
	
	if ( ! wp_verify_nonce( $_POST['waves_and_rocks_meta_box_page_for_term_nonce'], 'waves_and_rocks_save_meta_box_page_for_term' ) ) {
		return;
	}
	
	// If this is an autosave, our form has not been submitted, so we don't want to do anything.
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
		return;
	}

	// Check the user's permissions.
	if ( isset( $_POST['post_type'] ) && 'page' == $_POST['post_type'] ) {
		if ( ! current_user_can( 'edit_page', $post_id ) ) {
			return;
		}

	} else {

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return;
		}
	}
	
	// Save CSS
	if (isset( $_POST['waves-and-rocks-meta-box-custom-css'] ) ) {
		// Sanitize user input.
		$my_data = $_POST['waves-and-rocks-meta-box-custom-css'];
		
		// Update the meta field in the database.
		update_post_meta( $post_id, '_waves-and-rocks-custom-css', $my_data );
	}
	
}	



function waves_and_rocks_custom_css_the_content_filter($content) {
  $styles = get_post_meta( $GLOBALS['post']->ID, "_waves-and-rocks-custom-css", true );
  if (is_singular() and $styles !="") {
  	 $output = "";
	 $output .= "<style>";
	 $output .= $styles;
	 $output .= "</style>"; 
	 $content = $output.$content;
    
  }
  // otherwise returns the database content
  return $content;
}


/* ## 2. Allow Overwrite of first Term-Pages by Pages */


function waves_and_rocks_term_overwrite( $value ) {
	$output = "";
	$found = false;
	
	if(is_archive()){
		$output .= "<!-- … is archive -->";		
		global $wp_query;				
		if(isset($wp_query->query_vars['paged']) and $wp_query->query_vars['paged'] == 0){
			$output .= "<!-- … is first page -->";
			$term = get_queried_object();		
			//print_r($term);
			if(isset($term->term_id)){
				$post_id = _waves_and_rocks_term_is_overwritten_by($term->term_id);
				if(isset($post_id) and is_numeric($post_id)){
					$post = get_post($post_id);
					if(isset($post->post_content)){
						$found = true;
						if(has_post_thumbnail($post->ID)){
							$output .= "<p class='teaserimage'>";
							$output .= get_the_post_thumbnail($post->ID, 'medium');
							$output .= "</p>";
						}
						$output .= 	$post->post_content;
						$output .= "<p><a href='".get_edit_post_link($post->ID)."'>".__("Edit Page")."</a></p>";
						$output .= "<div class='broadside'><hr/></div>";
						$output .= "<h2>".__('Alle Beiträge …')."</h2>"	;	
					}
				}
			}
		}	
	}
	// Fallback	
	if(!$found){
		$output = $value;
	}
	
	return $output;
}


function waves_and_rocks_add_page_for_term_box($object){
	$page_id = get_term_meta($object->term_id, 'waves_and_rocks_page_for_term', true);
	
	print "<table class='form-table'>";
	print "<tbody>";
	print "<tr class='form-field'>";
	print "<th scope='row'>";
	print "<label for='page_for_term'>".__('Page for this Term')."</label>";
	print "</th>";
	print "<td>";
	print "<input id='waves_and_rocks_page_for_term' name='waves_and_rocks_page_for_term' value='".$page_id."' size='40' type='text'/>";
	print "<p class='description'>".__('Choose a Page for this Term')."</p>";
	print "</td>";
	print "</tr>";
	print "</tbody>";
	print "</table>";	
}

function waves_and_rocks_save_page_for_term($term_id, $taxonomy){
	if(isset($_POST['waves_and_rocks_page_for_term'])){
		update_term_meta($term_id, 'waves_and_rocks_page_for_term', $_POST['waves_and_rocks_page_for_term']);
	}
}


function _waves_and_rocks_term_is_overwritten_by($term_id){
	global $wpdb;
	$sql = "SELECT meta_value FROM ".$wpdb->termmeta." WHERE term_id = '".$term_id."' and meta_key = 'waves_and_rocks_page_for_term'";
	$result = $wpdb->get_var($sql);
	return $result;
}

function _waves_and_rocks_page_is_overwrite_for($page_id){
	global $wpdb;
	$sql = "SELECT term_id FROM ".$wpdb->termmeta." WHERE meta_value = '".$page_id."' and meta_key = 'waves_and_rocks_page_for_term'";
	$result = $wpdb->get_var($sql);
	return $result;
}


function waves_and_rocks_findout_screen(){
	if(function_exists("get_current_screen")){
		print "\n<!-- current_screen: [".get_current_screen()->id."] -->\n\n";
	}
}

// Redirect Pages to their related Term
function waves_and_rocks_header($name){
	if(is_page()){
		$page = get_queried_object();
		if(isset($page->ID)){
			$term_id = _waves_and_rocks_page_is_overwrite_for($page->ID);
			if(is_numeric($term_id)){
				$term_object = get_term($term_id);
				//print_r($term_object);
				$term_link = get_term_link($term_object);
				//print $term_link;
				if($term_link and strpos($term_link, "http://") === 0){
					wp_redirect($term_link);
				}
			}
		}
	}
}

// Add an Edit-Page Button to the Admin Bar, if on a Term page that has a Page
function waves_and_rocks_admin_bar_menu(){
	global $wp_admin_bar;
	$term = get_queried_object();
	$page_id = _waves_and_rocks_term_is_overwritten_by($term->term_id);
	if((is_category() or is_tag()) and is_numeric($page_id)){
		$menu = array();
		$menu['id'] = 'wp-edit-page-replacing-term';
		$menu['title'] = __('Edit Page');
		$menu['meta']['class'] = 'ab-item';
		$menu['href'] = get_edit_post_link($page_id);
	}
	$wp_admin_bar->add_menu($menu);
}

	
?>