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   1  <?php
   2  
   3  // This file is part of Moodle - http://moodle.org/
   4  //
   5  // Moodle is free software: you can redistribute it and/or modify
   6  // it under the terms of the GNU General Public License as published by
   7  // the Free Software Foundation, either version 3 of the License, or
   8  // (at your option) any later version.
   9  //
  10  // Moodle is distributed in the hope that it will be useful,
  11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  // GNU General Public License for more details.
  14  //
  15  // You should have received a copy of the GNU General Public License
  16  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17  
  18  /**
  19   * This script allows the number of sections in a course to be increased
  20   * or decreased, redirecting to the course page.
  21   *
  22   * @package core_course
  23   * @copyright 2012 Dan Poltawski
  24   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25   * @since Moodle 2.3
  26   */
  27  
  28  require_once(__DIR__.'/../config.php');
  29  require_once($CFG->dirroot.'/course/lib.php');
  30  
  31  $courseid = required_param('courseid', PARAM_INT);
  32  $increase = optional_param('increase', null, PARAM_BOOL);
  33  $insertsection = optional_param('insertsection', null, PARAM_INT); // Insert section at position; 0 means at the end.
  34  $numsections = optional_param('numsections', 1, PARAM_INT);        // Number of sections to insert.
  35  $returnurl = optional_param('returnurl', null, PARAM_LOCALURL);    // Where to return to after the action.
  36  $sectionreturn = optional_param('sectionreturn', null, PARAM_INT); // Section to return to, ignored if $returnurl is specified.
  37  
  38  $course = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
  39  $courseformatoptions = course_get_format($course)->get_format_options();
  40  
  41  $PAGE->set_url('/course/changenumsections.php', array('courseid' => $courseid));
  42  
  43  // Authorisation checks.
  44  require_login($course);
  45  require_capability('moodle/course:update', context_course::instance($course->id));
  46  require_sesskey();
  47  
  48  $desirednumsections = 0;
  49  $courseformat = course_get_format($course);
  50  $lastsectionnumber = $courseformat->get_last_section_number();
  51  $maxsections = $courseformat->get_max_sections();
  52  
  53  if (isset($courseformatoptions['numsections']) && $increase !== null) {
  54      $desirednumsections = $courseformatoptions['numsections'] + 1;
  55  } else if (course_get_format($course)->uses_sections() && $insertsection !== null) {
  56      // Count the sections in the course.
  57      $desirednumsections = $lastsectionnumber + $numsections;
  58  }
  59  
  60  if ($desirednumsections > $maxsections) {
  61      // Increase in number of sections is not allowed.
  62      \core\notification::warning(get_string('maxsectionslimit', 'moodle', $maxsections));
  63      $increase = null;
  64      $insertsection = null;
  65      $numsections = 0;
  66  
  67      if (!$returnurl) {
  68          $returnurl = course_get_url($course);
  69      }
  70  }
  71  
  72  if (isset($courseformatoptions['numsections']) && $increase !== null) {
  73      if ($increase) {
  74          // Add an additional section.
  75          $courseformatoptions['numsections']++;
  76          course_create_sections_if_missing($course, $courseformatoptions['numsections']);
  77      } else {
  78          // Remove a section.
  79          $courseformatoptions['numsections']--;
  80      }
  81  
  82      // Don't go less than 0, intentionally redirect silently (for the case of
  83      // double clicks).
  84      if ($courseformatoptions['numsections'] >= 0) {
  85          update_course((object)array('id' => $course->id,
  86              'numsections' => $courseformatoptions['numsections']));
  87      }
  88      if (!$returnurl) {
  89          $returnurl = course_get_url($course);
  90          $returnurl->set_anchor('changenumsections');
  91      }
  92  
  93  } else if (course_get_format($course)->uses_sections() && $insertsection !== null) {
  94      if ($insertsection) {
  95          // Inserting sections at any position except in the very end requires capability to move sections.
  96          require_capability('moodle/course:movesections', context_course::instance($course->id));
  97      }
  98      $sections = [];
  99      for ($i = 0; $i < max($numsections, 1); $i ++) {
 100          $sections[] = course_create_section($course, $insertsection);
 101      }
 102      if (!$returnurl) {
 103          $returnurl = course_get_url($course, $sections[0]->section,
 104              ($sectionreturn !== null) ? ['sr' => $sectionreturn] : []);
 105      }
 106  }
 107  
 108  // Redirect to where we were..
 109  redirect($returnurl);