prg-bib.php

<?php
/*
 * Plugin Name:       PRG Bibliography Shortcode
 * Plugin URI:        https://github.com/prg-titech/bib-shortcode/
 * Description:       Shortcode to embed publication lists.
 * Version:           0.1.6-alpha
 * Requires at least: 5.2
 * Requires PHP:      7.2
 * Author:            Hidehiko Masuhara
 * Author URI:        https://prg.is.titech.ac.jp/people/masuhara
 * License:           GPL v2 or later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 * Update URI:        https://github.com/prg-titech/prg-papers-bib/issues/65
 * Text Domain:       my-basics-plugin
 * Domain Path:       /languages
 * Requires Plugins:  
 */


/**
 * Our theme/plugin enqueue scripts function.
 * see https://www.briancoords.com/how-to-enqueue-js-for-a-shortcode/
 */
function prg_bib_enqueue_scripts() {
    
    // Register the script in the normal WordPress way.
    wp_register_script( 'resize-iframe-js',
                        plugins_url('resize-iframe.js',__FILE__));
    
    // Grab the global $post object.
    global $post;
    
    // See if the post HAS content and, if so, see if it has our shorcode.
    if ( isset( $post->post_content ) &&
         has_shortcode( $post->post_content, 'prg-bib' ) ) {
        wp_enqueue_script( 'resize-iframe-js' );
    }
}
add_action( 'wp_enqueue_scripts', 'prg_bib_enqueue_scripts' );

// Add Shortcode
function prg_bib_shortcode( $atts ) {
    global $post;

	// Attributes
	$atts = shortcode_atts(
		array(
			'key' => '',
            'more' => 'true',
		),
		$atts
	);
    $code = "";
    // when the post/page is shown on the front page, this will
    // produce only a "(more...)" link to the standalone page.
    // Otherwise (i.e., when it is shown as a standalone page), the
    // frame is shown.
    if($atts['more']=='true' && is_front_page() ){
        $more_link_text = __( '(more...)' );
        $code .= apply_filters(
            'the_content_more_link', 
            ' <a href="' . get_permalink() .
                "#more-{$post->ID}\" class=\"more-link\">$more_link_text</a>",
            $more_link_text );
    } else {
        foreach(preg_split("/\,/", $atts['key']) as $key) {
            //     $code = "<script>  function resizeIframe(obj) {
            //     obj.style.height = obj.contentWindow.document.documentElement.scrollHeight + 'px';
            //     obj.style.width = '100%';
            //     obj.style.border = 'none';
            //   }
            // </script>";
            $code .= "
<iframe src='https://prg.is.titech.ac.jp/papers/bibtexbrowser.php?key=". $key ."&bib=prg-e.bib;prg-j.bib;thesis-d.bib;thesis-m.bib;thesis-b.bib' class='bibtexbrowser' onload='resizeIframe(this)'></iframe>";
        }
    }
	return $code;
    
}
add_shortcode( 'prg-bib', 'prg_bib_shortcode' );