Add pagination in course_list shortcode in WPMU coursepress

code.php

<?php

/**
 * Usage: [course_list limit="5" pagination="true"]
 */ 

function edit_coursepress_shortcode(){
	remove_shortcode( 'course_list');
	add_shortcode( 'course_list', 'course_list_cb');
}
add_action('init', 'edit_coursepress_shortcode');


function add_custom_course_list_styles(){ ?>
	<style type="text/css">
	.course-list-pagination {
	  clear: both;
	}
	.course-list-pagination * {
	  border: 1px solid;
	  padding: 5px 10px;
	  border-radius: 5px;
	  text-decoration: none;
	}
	</style>
<?php }
add_action('wp_footer', 'add_custom_course_list_styles');

function course_list_cb( $atts ) {

			extract( shortcode_atts( array(
				'course_id'					 => '',
				'status'					 => 'publish',
				'instructor'				 => '', // Note, one or the other
				'instructor_msg'			 => __( 'The Instructor does not have any courses assigned yet.', 'cp' ),
				'student'					 => '', // If both student and instructor is specified only student will be used
				'student_msg'				 => __( 'You have not yet enrolled in a course. Browse courses %s', 'cp' ),
				'two_column'				 => 'yes',
				'title_column'				 => 'none',
				'left_class'				 => '',
				'right_class'				 => '',
				'course_class'				 => '',
				'title_link'				 => 'yes',
				'title_class'				 => 'course-title',
				'title_tag'					 => 'h3',
				'course_status'				 => 'all',
				'list_wrapper_before'		 => 'div',
				'list_wrapper_before_class'	 => 'course-list %s',
				'list_wrapper_after'		 => 'div',
				'show'						 => 'dates,enrollment_dates,class_size,cost',
				'show_button'				 => 'yes',
				'show_divider'				 => 'yes',
				'show_media'				 => 'false',
				'show_title'				 => 'yes',
				'media_type'				 => get_option( 'listings_media_type', 'image' ), // default, image, video
				'media_priority'			 => get_option( 'listings_media_priority', 'image' ), // image, video
				'admin_links'				 => false,
				'manage_link_title'			 => __( 'Manage Course', 'cp' ),
				'finished_link_title'		 => __( 'View Course', 'cp' ),
				'limit'						 => -1,
				'order'						 => 'ASC',
				'class'						 => '',
				'pagination'					=> false
			), $atts, 'course_list' ) );

			if ( !empty( $course_id ) ) {
				$course_id = (int) $course_id;
			}
			$status				 = sanitize_html_class( $status );
			$instructor			 = sanitize_text_field( $instructor );
			$instructor_msg		 = sanitize_text_field( $instructor_msg );
			$student			 = sanitize_text_field( $student );
			$student_msg		 = sanitize_text_field( $student_msg );
			$two_column			 = sanitize_html_class( $two_column );
			$title_column		 = sanitize_text_field( $title_column );
			$left_class			 = sanitize_html_class( $left_class );
			$right_class		 = sanitize_html_class( $right_class );
			$course_class		 = sanitize_html_class( $course_class );
			$title_link			 = sanitize_html_class( $title_link );
			$title_class		 = sanitize_html_class( $title_class );
			$title_tag			 = sanitize_html_class( $title_tag );
			$course_status		 = sanitize_text_field( $course_status );
			$list_wrapper_before = sanitize_html_class( $list_wrapper_before );
			$list_wrapper_after	 = sanitize_html_class( $list_wrapper_after );
			$show				 = sanitize_text_field( $show );
			$show_button		 = sanitize_html_class( $show_button );
			$show_divider		 = sanitize_html_class( $show_divider );
			$show_title			 = sanitize_html_class( $show_title );
			$show_media			 = sanitize_html_class( $show_media );
			$media_type			 = !empty( $media_type ) ? sanitize_text_field( $media_type ) : 'image';
			$media_priority		 = !empty( $media_priority ) ? sanitize_text_field( $media_priority ) : 'image';
			$admin_links		 = (bool) $admin_links;
			$manage_link_title	 = sanitize_text_field( $manage_link_title );
			$finished_link_title = sanitize_text_field( $finished_link_title );
			$limit				 = (int) $limit;
			$order				 = sanitize_html_class( $order );
			$class				 = sanitize_html_class( $class );

			$status = 'published' == $status ? 'publish' : $status;

// student or instructor ids provided
			$user_provided	 = false;
			$user_provided	 = empty( $student ) ? empty( $instructor ) ? false : true  : true;

			$content = '';
			$courses = array();

			if ( !empty( $instructor ) ) {
				$include_ids = array();
				$instructors = explode( ',', $instructor );
				if ( !empty( $instructors ) ) {
					foreach ( $instructors as $ins ) {
						$ins = (int) $ins;
						if ( $ins ) {
							$ins		 = new Instructor( $ins );
							$course_ids	 = $ins->get_assigned_courses_ids( $status );
							if ( $course_ids ) {
								$include_ids = array_unique( array_merge( $include_ids, $course_ids ) );
							}
						}
					}
				} else {
					$instructor = (int) $instructor;
					if ( $instructor ) {
						$instructor	 = new Instructor( $ins );
						$course_ids	 = $instructor->get_assigned_courses_ids( $status );
						if ( $course_ids ) {
							$include_ids = array_unique( array_merge( $include_ids, $course_ids ) );
						}
					}
				}
			}

			if ( !empty( $student ) ) {
				$include_ids = array();

				$students = explode( ',', $student );
				if ( !empty( $students ) ) {
					foreach ( $students as $stud ) {
						$stud = (int) $stud;
						if ( $stud ) {
							$stud		 = new Student( $stud );
							$course_ids	 = $stud->get_assigned_courses_ids( $status );
							if ( $course_ids ) {
								$include_ids = array_unique( array_merge( $include_ids, $course_ids ) );
							}
						}
					}
				} else {
					$student = (int) $student;
					if ( $student ) {
						$student	 = new Student( $student );
						$course_ids	 = $student->get_assigned_courses_ids( $status );
						if ( $course_ids ) {
							$include_ids = array_unique( array_merge( $include_ids, $course_ids ) );
						}
					}
				}
			}

			$post_args = array(
				'order'			 => $order,
				'post_type'		 => 'course',
				'meta_key'		 => 'enroll_type',
				'post_status'	 => $status,
				'posts_per_page' => $limit
			);
			
			if( $pagination ){
				$paged = (get_query_var('paged')) ? get_query_var('paged') : get_query_var('page');
				
				$post_args['paged'] = $paged;
			}

			if ( !empty( $include_ids ) ) {
				$post_args = wp_parse_args( array( 'include' => $include_ids ), $post_args );
			}


			if ( $user_provided && !empty( $include_ids ) || !$user_provided ) {
				$courses = get_posts( $post_args );
			}

			//<div class="course-list %s">
			$content .= 0 < count( $courses ) && !empty( $list_wrapper_before ) ? '<' . $list_wrapper_before . ' class=' . $list_wrapper_before_class . '>' : '';

			foreach ( $courses as $course ) {

				if ( !empty( $student ) && 'all' != strtolower( $course_status ) && !is_array( $student ) ) {
					$completion			 = new Course_Completion( $course->ID );
					$completion->init_student_status( $student );
					$course->completed	 = $completion->is_course_complete();

					// Skip if we wanted a completed course but got an incomplete
					if ( 'completed' == strtolower( $course_status ) && !$course->completed ) {
						continue;
					}
					// Skip if we wanted an incompleted course but got a completed
					if ( 'incomplete' == strtolower( $course_status ) && $course->completed ) {
						continue;
					}
				}

				$content .= '<div class="course-list-item ' . $course_class . '">';
				if ( 'yes' == $show_media ) {
					$content .= do_shortcode( '[course_media course_id="' . $course->ID . '" type="' . $media_type . '" priority="' . $media_priority . '"]' );
				}

				if ( 'none' == $title_column ) {
					$content .= do_shortcode( '[course_title course_id="' . $course->ID . '" link="' . $title_link . '" class="' . $title_class . '" title_tag="' . $title_tag . '"]' );
				}

				if ( 'yes' == $two_column ) {
					$content .= '<div class="course-list-box-left ' . $left_class . '">';
				}


				if ( 'left' == $title_column ) {
					$content .= do_shortcode( '[course_title course_id="' . $course->ID . '" link="' . $title_link . '" class="' . $title_class . '" title_tag="' . $title_tag . '"]' );
				}
// One liner..
				$content .= do_shortcode( '[course show="' . $show . '" show_title="yes" course_id="' . $course->ID . '"]' );

				if ( 'yes' == $two_column ) {
					$content .= '</div>';
					$content .= '<div class="course-list-box-right ' . $right_class . '">';
				}

				if ( 'right' == $title_column ) {
					$content .= do_shortcode( '[course_title course_id="' . $course->ID . '" link="' . $title_link . '" class="' . $title_class . '" title_tag="' . $title_tag . '"]' );
				}

				if ( 'yes' == $show_button ) {
					if ( !empty( $course->completed ) ) {
						$content .= do_shortcode( '[course_join_button course_id="' . $course->ID . '" continue_learning_text="' . $finished_link_title . '"]' );
					} else {
						$content .= do_shortcode( '[course_join_button course_id="' . $course->ID . '"]' );
					}
				}

				if ( $admin_links ) {
					$content .= '<button class="manage-course" data-link="' . admin_url( 'admin.php?page=course_details&course_id=' . $course->ID ) . '">' . $manage_link_title . '</button>';
				}

// Add action links if student
				if ( !empty( $student ) ) {
					$content .= do_shortcode( '[course_action_links course_id="' . $course->ID . '"]' );
				}

				if ( 'yes' == $two_column ) {
					$content .= '</div>';
				}

				if ( 'yes' == $show_divider ) {
					$content .= '<div class="divider" ></div>';
				}

				$content .= '</div>';  //course-list-item
			} // foreach

			if ( (!$courses || 0 == count( $courses ) ) && !empty( $instructor ) ) {
				$content .= $instructor_msg;
			}

			if ( (!$courses || 0 == count( $courses ) ) && !empty( $student ) ) {
				$content .= sprintf( $student_msg, '<a href="' . trailingslashit( site_url() . '/' . CoursePress::instance()->get_course_slug() ) . '">' . __( 'here', 'cp' ) . '</a>' );
			}

			// </div> course-list
			$content .= 0 < count( $courses ) && !empty( $list_wrapper_before ) ? '</' . $list_wrapper_after . '>' : '';
			
			if( $pagination ){
				global $wp_query;
				$total_course = wp_count_posts( 'course' );
				
				$paged = get_query_var('paged');
				if( ! $paged ) $paged = get_query_var('page');
				
				
				//echo max( 1,  );

				$big = 999999999; // need an unlikely integer
				
				$content .= '<div class="course-list-pagination">'.paginate_links( array(
					'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
					'format' => '/page/%#%',
					'current' => max( 1, $paged ),
					'total' => ceil( $total_course->publish / $limit )
				) ).'</div>';
			}

			return $content;
		}