wuwo-css2pdf.php

<?php
/*
Plugin Name: WUWO css2pdf implementation
Plugin URI:
Description: Using the css2pdf library for generating client side WUWO Session Plan PDF export files.
Author: Colin Safranek / css2pdf
Version: 1.0
Author URI: https://github.com/Xportability/css-to-pdf
*/

if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly.
}

// Register plugin scripts
// =============================================================================

function wuwo_enqueue_css2pdf_scripts()
{
    $path = plugin_dir_url( __FILE__ );

    // xepOnline.jqPlugin.js
    wp_register_script( 'wuwo-css2pdf', $path . 'js/xepOnline.jqPlugin.js', array( 'jquery' ), '1.0.0', true );

    // css2pdf-onlick.js
    wp_register_script( 'wuwo-css2pdf-onClick', $path . 'js/css2pdf-onlick.js', array( 'wuwo-css2pdf' ), '1.0.0', true );

    // }

}
add_action( 'wp_enqueue_scripts', 'wuwo_enqueue_css2pdf_scripts' );

/**
 * Rewrite Endpoint
 */
function wuwo_css2pdf_endpoint()
{
    add_rewrite_endpoint( 'pdf', EP_ALL );
}
add_action( 'init', 'wuwo_css2pdf_endpoint' );

// This is required, otherwise, a ?pdf query var with no value evaluates to FALSE, as if it did not exist.
function wuwo_css2pdf_rewrite_filter_request( $vars )
{
    if( isset( $vars['pdf'] ) )

        $vars['pdf'] = true;

    return $vars;
}
add_filter( 'request', 'wuwo_css2pdf_rewrite_filter_request' );

/**
 * PDF Templates
 */
function wuwo_css2pdf_templates( $template )
{
    write_log( 'wuwo-css2pdf - Hooking into template_include... Initial template used: ' );
    write_log( $template );

    // if there is no "/pdf/" endpoint, or "/?pdf" query var,
    //      then use the default template:
    if( ! get_query_var( 'pdf' ) )
    {
        write_log( 'wuwo-css2pdf - No "/pdf" endpoint was detected, or it returned FALSE.' );
        return $template;
    }

    // locate proper template file
    // NOTE: this only works if the standard template file exists as well
    // i.e. to use single-product-pdf.php you must also have single-product.php
    $pdf_template = str_replace( '.php', '-pdf.php', basename( $template ) );

    if( file_exists( get_stylesheet_directory() . '/' . $pdf_template ) )
    {
        $template_path = get_stylesheet_directory() . '/' . $pdf_template;
    }
    else if( file_exists( get_template_directory() . '/' . $pdf_template ) )
    {
        $template_path = get_template_directory() . '/' . $pdf_template;
    }
    else if( file_exists( plugin_dir_path(__FILE__) . $pdf_template ) )
    {
        $template_path = plugin_dir_path(__FILE__) . $pdf_template;
    }
    else
    {
        return $template;
    }

    // disable scripts and stylesheets
    // NOTE: We do this to get rid of all extraneous styles and scripts.
    // This way you have to define your own PDF styles using <style> tags in the template.
    add_action('wp_print_styles', 'wuwo_css2pdf_remove_dep_arrays', ~PHP_INT_MAX);

    write_log( 'wuwo-css2pdf - After PDF template redirect magic, this is the new template: ' );
    write_log( $template_path );
    return $template_path;
}
add_action( 'template_include', 'wuwo_css2pdf_templates', 100 );


// Function for removing all styles and scripts:
function wuwo_css2pdf_remove_dep_arrays()
{
    global $wp_styles;
    // write_log( 'Hooking into template_redirect... $wp_styles array is thus: ' );
    // write_log( $wp_styles );
    $wp_styles = array();

    // Now enqueue our additional necessary scripts:
        // xepOnline.jqPlugin.js
    wp_enqueue_script( 'wuwo-css2pdf' );

        // css2pdf-onlick.js
    wp_enqueue_script( 'wuwo-css2pdf-onClick' );
}


// Define main wuwo_css2pdf_active function
// this can be used to check if the plugin is active from within a page template:
function wuwo_css2pdf_active()
{
    return true;
}