mod/book/delete.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * Delete book chapter
  19  *
  20  * @package    mod_book
  21  * @copyright  2004-2011 Petr Skoda {@link http://skodak.org}
  22  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  */
  24
  25 require(__DIR__.'/../../config.php');
  26 require_once(__DIR__.'/locallib.php');
  27
  28 // Course Module ID.
  29 $id        = required_param('id', PARAM_INT);
  30
  31 // Chapter ID.
  32 $chapterid = required_param('chapterid', PARAM_INT);
  33
  34 $confirm   = optional_param('confirm', 0, PARAM_BOOL);
  35
  36 $cm = get_coursemodule_from_id('book', $id, 0, false, MUST_EXIST);
  37 $course = $DB->get_record('course', ['id' => $cm->course], '*', MUST_EXIST);
  38 $book = $DB->get_record('book', ['id' => $cm->instance], '*', MUST_EXIST);
  39 $chapter = $DB->get_record('book_chapters', ['id' => $chapterid, 'bookid' => $book->id], '*', MUST_EXIST);
  40
  41 require_login($course, false, $cm);
  42 require_sesskey();
  43
  44 $context = context_module::instance($cm->id);
  45 require_capability('mod/book:edit', $context);
  46
  47 $PAGE->set_url('/mod/book/delete.php', ['id' => $id, 'chapterid' => $chapterid]);
  48
  49 if ($confirm) {
  50     // The operation was confirmed.
  51     $fs = get_file_storage();
  52
  53     $subchaptercount = 0;
  54     if (!$chapter->subchapter) {
  55         // This is a top-level chapter.
  56         // Make sure to remove any sub-chapters if there are any.
  57         $chapters = $DB->get_recordset_select('book_chapters', 'bookid = :bookid AND pagenum > :pagenum', [
  58                 'bookid' => $book->id,
  59                 'pagenum' => $chapter->pagenum,
  60             ], 'pagenum');
  61
  62         foreach ($chapters as $ch) {
  63             if (!$ch->subchapter) {
  64                 // This is a new chapter. Any subsequent subchapters will be part of a different chapter.
  65                 break;
  66             } else {
  67                 // This is subchapter of the chapter being removed.
  68                 core_tag_tag::remove_all_item_tags('mod_book', 'book_chapters', $ch->id);
  69                 $fs->delete_area_files($context->id, 'mod_book', 'chapter', $ch->id);
  70                 $DB->delete_records('book_chapters', ['id' => $ch->id]);
  71                 \mod_book\event\chapter_deleted::create_from_chapter($book, $context, $ch)->trigger();
  72
  73                 $subchaptercount++;
  74             }
  75         }
  76         $chapters->close();
  77     }
  78
  79     // Now delete the actual chapter.
  80     core_tag_tag::remove_all_item_tags('mod_book', 'book_chapters', $chapter->id);
  81     $fs->delete_area_files($context->id, 'mod_book', 'chapter', $chapter->id);
  82     $DB->delete_records('book_chapters', ['id' => $chapter->id]);
  83
  84     \mod_book\event\chapter_deleted::create_from_chapter($book, $context, $chapter)->trigger();
  85
  86     // Ensure that the book structure is correct.
  87     // book_preload_chapters will fix parts including the pagenum.
  88     $chapters = book_preload_chapters($book);
  89
  90     book_add_fake_block($chapters, $chapter, $book, $cm);
  91
  92     // Bump the book revision.
  93     $DB->set_field('book', 'revision', $book->revision + 1, ['id' => $book->id]);
  94
  95     if ($subchaptercount) {
  96         $message = get_string('chapterandsubchaptersdeleted', 'mod_book', (object) [
  97             'title' => format_string($chapter->title),
  98             'subchapters' => $subchaptercount,
  99         ]);
 100     } else {
 101         $message = get_string('chapterdeleted', 'mod_book', (object) [
 102             'title' => format_string($chapter->title),
 103         ]);
 104     }
 105
 106     redirect(new moodle_url('/mod/book/view.php', ['id' => $cm->id]), $message);
 107 }
 108
 109 redirect(new moodle_url('/mod/book/view.php', ['id' => $cm->id]));