calendar/lib.php

   1 <?php // $Id$
   2
   3 /////////////////////////////////////////////////////////////////////////////
   4 //                                                                         //
   5 // NOTICE OF COPYRIGHT                                                     //
   6 //                                                                         //
   7 // Moodle - Calendar extension                                             //
   8 //                                                                         //
   9 // Copyright (C) 2003-2004  Greek School Network            www.sch.gr     //
  10 //                                                                         //
  11 // Designed by:                                                            //
  12 //     Avgoustos Tsinakos (tsinakos@teikav.edu.gr)                         //
  13 //     Jon Papaioannou (pj@moodle.org)                                     //
  14 //                                                                         //
  15 // Programming and development:                                            //
  16 //     Jon Papaioannou (pj@moodle.org)                                     //
  17 //                                                                         //
  18 // For bugs, suggestions, etc contact:                                     //
  19 //     Jon Papaioannou (pj@moodle.org)                                     //
  20 //                                                                         //
  21 // The current module was developed at the University of Macedonia         //
  22 // (www.uom.gr) under the funding of the Greek School Network (www.sch.gr) //
  23 // The aim of this project is to provide additional and improved           //
  24 // functionality to the Asynchronous Distance Education service that the   //
  25 // Greek School Network deploys.                                           //
  26 //                                                                         //
  27 // This program is free software; you can redistribute it and/or modify    //
  28 // it under the terms of the GNU General Public License as published by    //
  29 // the Free Software Foundation; either version 2 of the License, or       //
  30 // (at your option) any later version.                                     //
  31 //                                                                         //
  32 // This program is distributed in the hope that it will be useful,         //
  33 // but WITHOUT ANY WARRANTY; without even the implied warranty of          //
  34 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           //
  35 // GNU General Public License for more details:                            //
  36 //                                                                         //
  37 //          http://www.gnu.org/copyleft/gpl.html                           //
  38 //                                                                         //
  39 /////////////////////////////////////////////////////////////////////////////
  40
  41 // These are read by the administration component to provide default values
  42 define('CALENDAR_DEFAULT_UPCOMING_LOOKAHEAD', 21);
  43 define('CALENDAR_DEFAULT_UPCOMING_MAXEVENTS', 10);
  44 define('CALENDAR_DEFAULT_STARTING_WEEKDAY',   1);
  45 // This is a packed bitfield: day X is "weekend" if $field & (1 << X) is true
  46 // Default value = 65 = 64 + 1 = 2^6 + 2^0 = Saturday & Sunday
  47 define('CALENDAR_DEFAULT_WEEKEND',            65);
  48
  49 // Fetch the correct values from admin settings/lang pack
  50 // If no such settings found, use the above defaults
  51 $firstday = isset($CFG->calendar_startwday) ? $CFG->calendar_startwday : get_string('firstdayofweek');
  52 if(!is_numeric($firstday)) {
  53     define ('CALENDAR_STARTING_WEEKDAY', CALENDAR_DEFAULT_STARTING_WEEKDAY);
  54 }
  55 else {
  56     define ('CALENDAR_STARTING_WEEKDAY', intval($firstday) % 7);
  57 }
  58 define ('CALENDAR_UPCOMING_DAYS', isset($CFG->calendar_lookahead) ? intval($CFG->calendar_lookahead) : CALENDAR_DEFAULT_UPCOMING_LOOKAHEAD);
  59 define ('CALENDAR_UPCOMING_MAXEVENTS', isset($CFG->calendar_maxevents) ? intval($CFG->calendar_maxevents) : CALENDAR_DEFAULT_UPCOMING_MAXEVENTS);
  60 define ('CALENDAR_WEEKEND', isset($CFG->calendar_weekend) ? intval($CFG->calendar_weekend) : CALENDAR_DEFAULT_WEEKEND);
  61 define ('CALENDAR_URL', $CFG->wwwroot.'/calendar/');
  62 define ('CALENDAR_TF_24', '%H:%M');
  63 define ('CALENDAR_TF_12', '%I:%M %p');
  64
  65 define ('CALENDAR_MAXCOURSES', 3);
  66
  67 $CALENDARDAYS = array('sunday','monday','tuesday','wednesday','thursday','friday','saturday');
  68
  69
  70
  71 function calendar_get_mini($courses, $groups, $users, $cal_month = false, $cal_year = false) {
  72     global $CFG, $USER;
  73
  74     $display = &New stdClass;
  75     $display->minwday = get_user_preferences('calendar_startwday', CALENDAR_STARTING_WEEKDAY);
  76     $display->maxwday = $display->minwday + 6;
  77
  78     $content = '';
  79
  80     if(!empty($cal_month) && !empty($cal_year)) {
  81         $thisdate = usergetdate(time()); // Date and time the user sees at his location
  82         if($cal_month == $thisdate['mon'] && $cal_year == $thisdate['year']) {
  83             // Navigated to this month
  84             $date = $thisdate;
  85             $display->thismonth = true;
  86         }
  87         else {
  88             // Navigated to other month, let's do a nice trick and save us a lot of work...
  89             if(!checkdate($cal_month, 1, $cal_year)) {
  90                 $date = array('mday' => 1, 'mon' => $thisdate['mon'], 'year' => $thisdate['year']);
  91                 $display->thismonth = true;
  92             }
  93             else {
  94                 $date = array('mday' => 1, 'mon' => $cal_month, 'year' => $cal_year);
  95                 $display->thismonth = false;
  96             }
  97         }
  98     }
  99     else {
 100         $date = usergetdate(time()); // Date and time the user sees at his location
 101         $display->thismonth = true;
 102     }
 103
 104     // Fill in the variables we 're going to use, nice and tidy
 105     list($d, $m, $y) = array($date['mday'], $date['mon'], $date['year']); // This is what we want to display
 106     $display->maxdays = calendar_days_in_month($m, $y);
 107
 108     if (get_user_timezone_offset() < 99) {
 109         // We 'll keep these values as GMT here, and offset them when the time comes to query the db
 110         $display->tstart = gmmktime(0, 0, 0, $m, 1, $y); // This is GMT
 111         $display->tend = gmmktime(23, 59, 59, $m, $display->maxdays, $y); // GMT
 112     } else {
 113         // no timezone info specified
 114         $display->tstart = mktime(0, 0, 0, $m, 1, $y);
 115         $display->tend = mktime(23, 59, 59, $m, $display->maxdays, $y);
 116     }
 117
 118     $startwday = dayofweek(1, $m, $y);
 119
 120     // Align the starting weekday to fall in our display range
 121     // This is simple, not foolproof.
 122     if($startwday < $display->minwday) {
 123         $startwday += 7;
 124     }
 125
 126     // TODO: THIS IS TEMPORARY CODE!
 127     // [pj] I was just reading through this and realized that I when writing this code I was probably
 128     // asking for trouble, as all these time manipulations seem to be unnecessary and a simple
 129     // make_timestamp would accomplish the same thing. So here goes a test:
 130     //$test_start = make_timestamp($y, $m, 1);
 131     //$test_end   = make_timestamp($y, $m, $display->maxdays, 23, 59, 59);
 132     //if($test_start != usertime($display->tstart) - dst_offset_on($display->tstart)) {
 133         //notify('Failed assertion in calendar/lib.php line 126; display->tstart = '.$display->tstart.', dst_offset = '.dst_offset_on($display->tstart).', usertime = '.usertime($display->tstart).', make_t = '.$test_start);
 134     //}
 135     //if($test_end != usertime($display->tend) - dst_offset_on($display->tend)) {
 136         //notify('Failed assertion in calendar/lib.php line 130; display->tend = '.$display->tend.', dst_offset = '.dst_offset_on($display->tend).', usertime = '.usertime($display->tend).', make_t = '.$test_end);
 137     //}
 138
 139
 140     // Get the events matching our criteria. Don't forget to offset the timestamps for the user's TZ!
 141     $whereclause = calendar_sql_where(
 142         usertime($display->tstart) - dst_offset_on($display->tstart),
 143         usertime($display->tend) - dst_offset_on($display->tend),
 144         $users, $groups, $courses);
 145
 146     if($whereclause === false) {
 147         $events = array();
 148     }
 149     else {
 150         $events = get_records_select('event', $whereclause, 'timestart');
 151     }
 152
 153     // Set event course class for course events
 154     if (!empty($events)) {
 155         foreach ($events as $event) {
 156             if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {
 157                 $event->class = 'event_course'.array_search($event->courseid, $courses) % CALENDAR_MAXCOURSES;
 158             }
 159         }
 160     }
 161
 162     // This is either a genius idea or an idiot idea: in order to not complicate things, we use this rule: if, after
 163     // possibly removing SITEID from $courses, there is only one course left, then clicking on a day in the month
 164     // will also set the $SESSION->cal_courses_shown variable to that one course. Otherwise, we 'd need to add extra
 165     // arguments to this function.
 166
 167     $morehref = '';
 168     if(!empty($courses)) {
 169         $courses = array_diff($courses, array(SITEID));
 170         if(count($courses) == 1) {
 171             $morehref = '&amp;course='.reset($courses);
 172         }
 173     }
 174
 175     // We want to have easy access by day, since the display is on a per-day basis.
 176     // Arguments passed by reference.
 177     //calendar_events_by_day($events, $display->tstart, $eventsbyday, $durationbyday, $typesbyday);
 178     calendar_events_by_day($events, $m, $y, $eventsbyday, $durationbyday, $typesbyday, $courses);
 179
 180     //Accessibility: added summary and <abbr> elements.
 181     ///global $CALENDARDAYS; appears to be broken.
 182     $days_title = array('sunday','monday','tuesday','wednesday','thursday','friday','saturday');
 183
 184     $summary = get_string('calendarheading', 'calendar', userdate(make_timestamp($y, $m), get_string('strftimemonthyear')));
 185     $summary = get_string('tabledata', 'access', $summary);
 186     $content .= '<table class="minicalendar" summary="'.$summary.'">'; // Begin table
 187     $content .= '<tr class="weekdays">'; // Header row: day names
 188
 189     // Print out the names of the weekdays
 190     $days = array('sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat');
 191     for($i = $display->minwday; $i <= $display->maxwday; ++$i) {
 192         // This uses the % operator to get the correct weekday no matter what shift we have
 193         // applied to the $display->minwday : $display->maxwday range from the default 0 : 6
 194         $content .= '<th scope="col"><abbr title="'. get_string($days_title[$i % 7], 'calendar') .'">'.
 195             get_string($days[$i % 7], 'calendar') ."</abbr></th>\n";
 196     }
 197
 198     $content .= '</tr><tr>'; // End of day names; prepare for day numbers
 199
 200     // For the table display. $week is the row; $dayweek is the column.
 201     $dayweek = $startwday;
 202
 203     // Paddding (the first week may have blank days in the beginning)
 204     for($i = $display->minwday; $i < $startwday; ++$i) {
 205         $content .= '<td class="dayblank">&nbsp;</td>'."\n";
 206     }
 207
 208     // Now display all the calendar
 209     for($day = 1; $day <= $display->maxdays; ++$day, ++$dayweek) {
 210         if($dayweek > $display->maxwday) {
 211             // We need to change week (table row)
 212             $content .= '</tr><tr>';
 213             $dayweek = $display->minwday;
 214         }
 215
 216         // Reset vars
 217         $cell = '';
 218         if(CALENDAR_WEEKEND & (1 << ($dayweek % 7))) {
 219             // Weekend. This is true no matter what the exact range is.
 220             $class = 'weekend day';
 221         }
 222         else {
 223             // Normal working day.
 224             $class = 'day';
 225         }
 226
 227         // Special visual fx if an event is defined
 228         if(isset($eventsbyday[$day])) {
 229             $dayhref = calendar_get_link_href(CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $day, $m, $y);
 230
 231             // OverLib popup
 232             $popupcontent = '';
 233             foreach($eventsbyday[$day] as $eventid) {
 234                 if (!isset($events[$eventid])) {
 235                     continue;
 236                 }
 237                 $event = $events[$eventid];
 238                 if(!empty($event->modulename)) {
 239                     $popupicon = $CFG->modpixpath.'/'.$event->modulename.'/icon.gif';
 240                     $popupalt  = $event->modulename;
 241
 242                 } else if ($event->courseid == SITEID) {                                // Site event
 243                     $popupicon = $CFG->pixpath.'/c/site.gif';
 244                     $popupalt  = '';
 245                 } else if ($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {      // Course event
 246                     $popupicon = $CFG->pixpath.'/c/course.gif';
 247                     $popupalt  = '';
 248                 } else if ($event->groupid) {                                      // Group event
 249                     $popupicon = $CFG->pixpath.'/c/group.gif';
 250                     $popupalt  = '';
 251                 } else if ($event->userid) {                                       // User event
 252                     $popupicon = $CFG->pixpath.'/c/user.gif';
 253                     $popupalt  = '';
 254                 }
 255                 $popupcontent .= '<div><img class="icon" src="'.$popupicon.'" alt="'.$popupalt.'" /><a href="'.$dayhref.'#event_'.$event->id.'">'.format_string($event->name, true).'</a></div>';
 256             }
 257
 258             //Accessibility: functionality moved to calendar_get_popup.
 259             if($display->thismonth && $day == $d) {
 260                 $popup = calendar_get_popup(true, $events[$eventid]->timestart, $popupcontent);
 261             } else {
 262                 $popup = calendar_get_popup(false, $events[$eventid]->timestart, $popupcontent);
 263             }
 264
 265             // Class and cell content
 266             if(isset($typesbyday[$day]['startglobal'])) {
 267                 $class .= ' event_global';
 268             }
 269             else if(isset($typesbyday[$day]['startcourse'])) {
 270                 $class .= ' event_course';
 271             }
 272             else if(isset($typesbyday[$day]['startgroup'])) {
 273                 $class .= ' event_group';
 274             }
 275             else if(isset($typesbyday[$day]['startuser'])) {
 276                 $class .= ' event_user';
 277             }
 278             $cell = '<a href="'.$dayhref.'" '.$popup.'>'.$day.'</a>';
 279         }
 280         else {
 281             $cell = $day;
 282         }
 283
 284         if(isset($typesbyday[$day]['durationglobal'])) {
 285             $class .= ' duration_global';
 286         }
 287         else if(isset($typesbyday[$day]['durationcourse'])) {
 288             $class .= ' duration_course';
 289         }
 290         else if(isset($typesbyday[$day]['durationgroup'])) {
 291             $class .= ' duration_group';
 292         }
 293         else if(isset($typesbyday[$day]['durationuser'])) {
 294             $class .= ' duration_user';
 295         }
 296
 297         // If event has a class set then add it to the table day <td> tag
 298         // Note: only one colour for minicalendar
 299         if(isset($eventsbyday[$day])) {
 300             foreach($eventsbyday[$day] as $eventid) {
 301                 if (!isset($events[$eventid])) {
 302                     continue;
 303                 }
 304                 $event = $events[$eventid];
 305                 if (!empty($event->class)) {
 306                     $class .= ' '.$event->class;
 307                 }
 308                 break;
 309             }
 310         }
 311
 312         // Special visual fx for today
 313         //Accessibility: hidden text for today, and popup.
 314         if($display->thismonth && $day == $d) {
 315             $class .= ' today';
 316             $today = get_string('today', 'calendar').' '.userdate(time(), get_string('strftimedayshort'));
 317
 318             if(! isset($eventsbyday[$day])) {
 319                 $class .= ' eventnone';
 320                 $popup = calendar_get_popup(true, false);
 321                 $cell = '<a href="#" '.$popup.'>'.$day.'</a>';
 322             }
 323             $cell = '<span class="accesshide">'.$today.' </span>'.$cell;
 324         }
 325
 326         // Just display it
 327         if(!empty($class)) {
 328             $class = ' class="'.$class.'"';
 329         }
 330         $content .= '<td'.$class.'>'.$cell."</td>\n";
 331     }
 332
 333     // Paddding (the last week may have blank days at the end)
 334     for($i = $dayweek; $i <= $display->maxwday; ++$i) {
 335         $content .= '<td class="dayblank">&nbsp;</td>';
 336     }
 337     $content .= '</tr>'; // Last row ends
 338
 339     $content .= '</table>'; // Tabular display of days ends
 340
 341     return $content;
 342 }
 343
 344 /**
 345  * calendar_get_popup, called at multiple points in from calendar_get_mini.
 346  *        Copied and modified from calendar_get_mini.
 347  * @uses OverLib popup.
 348  * @param $is_today bool, false except when called on the current day.
 349  * @param $event_timestart mixed, $events[$eventid]->timestart, OR false if there are no events.
 350  * @param $popupcontent string.
 351  * @return $popup string, contains onmousover and onmouseout events.
 352  */
 353 function calendar_get_popup($is_today, $event_timestart, $popupcontent='') {
 354     $popupcaption = '';
 355     if($is_today) {
 356         $popupcaption = get_string('today', 'calendar').' ';
 357     }
 358     if (false === $event_timestart) {
 359         $popupcaption .= userdate(time(), get_string('strftimedayshort'));
 360         $popupcontent = get_string('eventnone', 'calendar');
 361
 362     } else {
 363         $popupcaption .= get_string('eventsfor', 'calendar', userdate($event_timestart, get_string('strftimedayshort')));
 364     }
 365     $popupcontent = str_replace("'", "\'", htmlspecialchars($popupcontent));
 366     $popupcaption = str_replace("'", "\'", htmlspecialchars($popupcaption));
 367     $popup = 'onmouseover="return overlib(\''.$popupcontent.'\', CAPTION, \''.$popupcaption.'\');" onmouseout="return nd();"';
 368     return $popup;
 369 }
 370
 371 function calendar_get_upcoming($courses, $groups, $users, $daysinfuture, $maxevents, $fromtime=0) {
 372     global $CFG;
 373
 374     $display = &new stdClass;
 375     $display->range = $daysinfuture; // How many days in the future we 'll look
 376     $display->maxevents = $maxevents;
 377
 378     $output = array();
 379
 380     // Prepare "course caching", since it may save us a lot of queries
 381     $coursecache = array();
 382
 383     $processed = 0;
 384     $now = time(); // We 'll need this later
 385     $usermidnighttoday = usergetmidnight($now);
 386
 387     if ($fromtime) {
 388         $display->tstart = $fromtime;
 389     } else {
 390         $display->tstart = $usermidnighttoday;
 391     }
 392
 393     // This works correctly with respect to the user's DST, but it is accurate
 394     // only because $fromtime is always the exact midnight of some day!
 395     $display->tend = usergetmidnight($display->tstart + DAYSECS * $display->range + 3 * HOURSECS) - 1;
 396
 397     // Get the events matching our criteria
 398     $whereclause = calendar_sql_where($display->tstart, $display->tend, $users, $groups, $courses);
 399     if ($whereclause === false) {
 400         $events = false;
 401     } else {
 402         $events = get_records_select('event', $whereclause, 'timestart');
 403     }
 404
 405     // This is either a genius idea or an idiot idea: in order to not complicate things, we use this rule: if, after
 406     // possibly removing SITEID from $courses, there is only one course left, then clicking on a day in the month
 407     // will also set the $SESSION->cal_courses_shown variable to that one course. Otherwise, we 'd need to add extra
 408     // arguments to this function.
 409
 410     $morehref = '';
 411     if(!empty($courses)) {
 412         $courses = array_diff($courses, array(SITEID));
 413         if(count($courses) == 1) {
 414             $morehref = '&amp;course='.reset($courses);
 415         }
 416     }
 417
 418     if($events !== false) {
 419
 420         foreach($events as $event) {
 421
 422             if($processed >= $display->maxevents) {
 423                 break;
 424             }
 425
 426             $event->time = calendar_format_event_time($event, $now, $morehref);
 427             $output[] = $event;
 428             ++$processed;
 429         }
 430     }
 431     return $output;
 432 }
 433
 434 function calendar_add_event_metadata($event) {
 435     global $CFG;
 436
 437     //Support multilang in event->name
 438     $event->name = format_string($event->name,true);
 439
 440     if(!empty($event->modulename)) {                                // Activity event
 441         // The module name is set. I will assume that it has to be displayed, and
 442         // also that it is an automatically-generated event. And of course that the
 443         // fields for get_coursemodule_from_instance are set correctly.
 444         $module = calendar_get_module_cached($coursecache, $event->modulename, $event->instance);
 445
 446         if ($module === false) {
 447             return;
 448         }
 449
 450         $modulename = get_string('modulename', $event->modulename);
 451         $eventtype = get_string($event->eventtype, $event->modulename);
 452         $icon = $CFG->modpixpath.'/'.$event->modulename.'/icon.gif';
 453
 454         $event->icon = '<img height="16" width="16" src="'.$icon.'" alt="'.$eventtype.'" title="'.$modulename.'" style="vertical-align: middle;" />';
 455         $event->referer = '<a href="'.$CFG->wwwroot.'/mod/'.$event->modulename.'/view.php?id='.$module->id.'">'.$event->name.'</a>';
 456         $event->courselink = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$module->course.'">'.$coursecache[$module->course]->fullname.'</a>';
 457         $event->cmid = $module->id;
 458
 459
 460     } else if($event->courseid == SITEID) {                              // Site event
 461         $event->icon = '<img height="16" width="16" src="'.$CFG->pixpath.'/c/site.gif" alt="'.get_string('globalevent', 'calendar').'" style="vertical-align: middle;" />';
 462         $event->cssclass = 'event_global';
 463     } else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {          // Course event
 464         calendar_get_course_cached($coursecache, $event->courseid);
 465         $event->icon = '<img height="16" width="16" src="'.$CFG->pixpath.'/c/course.gif" alt="'.get_string('courseevent', 'calendar').'" style="vertical-align: middle;" />';
 466         $event->courselink = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$event->courseid.'">'.$coursecache[$event->courseid]->fullname.'</a>';
 467         $event->cssclass = 'event_course';
 468     } else if ($event->groupid) {                                    // Group event
 469         $event->icon = '<img height="16" width="16" src="'.$CFG->pixpath.'/c/group.gif" alt="'.get_string('groupevent', 'calendar').'" style="vertical-align: middle;" />';
 470         $event->cssclass = 'event_group';
 471     } else if($event->userid) {                                      // User event
 472         $event->icon = '<img height="16" width="16" src="'.$CFG->pixpath.'/c/user.gif" alt="'.get_string('userevent', 'calendar').'" style="vertical-align: middle;" />';
 473         $event->cssclass = 'event_user';
 474     }
 475     return $event;
 476 }
 477
 478 function calendar_print_event($event) {
 479     global $CFG, $USER;
 480
 481     static $strftimetime;
 482
 483     $event = calendar_add_event_metadata($event);
 484     echo '<a name="event_'.$event->id.'"></a><table class="event" cellspacing="0">';
 485     echo '<tr><td class="picture">';
 486     if (!empty($event->icon)) {
 487         echo $event->icon;
 488     } else {
 489         print_spacer(16,16);
 490     }
 491     echo '</td>';
 492     echo '<td class="topic">';
 493
 494     if (!empty($event->referer)) {
 495         echo '<div class="referer">'.$event->referer.'</div>';
 496     } else {
 497         echo '<div class="name">'.$event->name."</div>";
 498     }
 499     if (!empty($event->courselink)) {
 500         echo '<div class="course">'.$event->courselink.' </div>';
 501     }
 502     if (!empty($event->time)) {
 503         echo '<span class="date">'.$event->time.'</span>';
 504     } else {
 505         echo '<span class="date">'.calendar_time_representation($event->timestart).'</span>';
 506     }
 507
 508     echo '</td></tr>';
 509     echo '<tr><td class="side">&nbsp;</td>';
 510
 511     // If event has a class set then add it to the event <td> tag
 512     $eventclass='';
 513     if (!empty($event->class)) {
 514         $eventclass = ' '.$event->class;
 515     }
 516
 517     echo '<td class="description '.$event->cssclass.$eventclass.'">';
 518     echo format_text($event->description, FORMAT_HTML);
 519     if (calendar_edit_event_allowed($event)) {
 520         echo '<div class="commands">';
 521         $calendarcourseid = '';
 522         if (!empty($event->calendarcourseid)) {
 523             $calendarcourseid = '&amp;course='.$event->calendarcourseid;
 524         }
 525         if (empty($event->cmid)) {
 526             $editlink   = CALENDAR_URL.'event.php?action=edit&amp;id='.$event->id.$calendarcourseid;
 527             $deletelink = CALENDAR_URL.'event.php?action=delete&amp;id='.$event->id.$calendarcourseid;
 528         } else {
 529             $editlink   = $CFG->wwwroot.'/course/mod.php?update='.$event->cmid.'&amp;return=true&amp;sesskey='.$USER->sesskey;
 530             $deletelink = $CFG->wwwroot.'/course/mod.php?delete='.$event->cmid.'&amp;sesskey='.$USER->sesskey;;
 531         }
 532         echo ' <a href="'.$editlink.'"><img
 533                   src="'.$CFG->pixpath.'/t/edit.gif" alt="'.get_string('tt_editevent', 'calendar').'"
 534                   title="'.get_string('tt_editevent', 'calendar').'" /></a>';
 535         echo ' <a href="'.$deletelink.'"><img
 536                   src="'.$CFG->pixpath.'/t/delete.gif" alt="'.get_string('tt_deleteevent', 'calendar').'"
 537                   title="'.get_string('tt_deleteevent', 'calendar').'" /></a>';
 538         echo '</div>';
 539     }
 540     echo '</td></tr></table>';
 541
 542 }
 543
 544 function calendar_sql_where($tstart, $tend, $users, $groups, $courses, $withduration=true, $ignorehidden=true) {
 545     $whereclause = '';
 546     // Quick test
 547     if(is_bool($users) && is_bool($groups) && is_bool($courses)) {
 548         return false;
 549     }
 550
 551     if(is_array($users) && !empty($users)) {
 552         // Events from a number of users
 553         if(!empty($whereclause)) $whereclause .= ' OR';
 554         $whereclause .= ' (userid IN ('.implode(',', $users).') AND courseid = 0 AND groupid = 0)';
 555     }
 556     else if(is_numeric($users)) {
 557         // Events from one user
 558         if(!empty($whereclause)) $whereclause .= ' OR';
 559         $whereclause .= ' (userid = '.$users.' AND courseid = 0 AND groupid = 0)';
 560     }
 561     else if($users === true) {
 562         // Events from ALL users
 563         if(!empty($whereclause)) $whereclause .= ' OR';
 564         $whereclause .= ' (userid != 0 AND courseid = 0 AND groupid = 0)';
 565     }
 566     else if($users === false) {
 567         // No user at all, do nothing
 568     }
 569
 570     if(is_array($groups) && !empty($groups)) {
 571         // Events from a number of groups
 572         if(!empty($whereclause)) $whereclause .= ' OR';
 573         $whereclause .= ' groupid IN ('.implode(',', $groups).')';
 574     }
 575     else if(is_numeric($groups)) {
 576         // Events from one group
 577         if(!empty($whereclause)) $whereclause .= ' OR ';
 578         $whereclause .= ' groupid = '.$groups;
 579     }
 580     else if($groups === true) {
 581         // Events from ALL groups
 582         if(!empty($whereclause)) $whereclause .= ' OR ';
 583         $whereclause .= ' groupid != 0';
 584     }
 585     // boolean false (no groups at all): we don't need to do anything
 586
 587     if(is_array($courses)) {
 588         // A number of courses (maybe none at all!)
 589         if(!empty($courses)) {
 590             if(!empty($whereclause)) {
 591                 $whereclause .= ' OR';
 592             }
 593             $whereclause .= ' (groupid = 0 AND courseid IN ('.implode(',', $courses).'))';
 594         }
 595         else {
 596             // This means NO courses, not that we don't care!
 597             // No need to do anything
 598         }
 599     }
 600     else if(is_numeric($courses)) {
 601         // One course
 602         if(!empty($whereclause)) $whereclause .= ' OR';
 603         $whereclause .= ' (groupid = 0 AND courseid = '.$courses.')';
 604     }
 605     else if($courses === true) {
 606         // Events from ALL courses
 607         if(!empty($whereclause)) $whereclause .= ' OR';
 608         $whereclause .= ' (groupid = 0 AND courseid != 0)';
 609     }
 610
 611     // Security check: if, by now, we have NOTHING in $whereclause, then it means
 612     // that NO event-selecting clauses were defined. Thus, we won't be returning ANY
 613     // events no matter what. Allowing the code to proceed might return a completely
 614     // valid query with only time constraints, thus selecting ALL events in that time frame!
 615     if(empty($whereclause)) {
 616         return false;
 617     }
 618
 619     if($withduration) {
 620         $timeclause = '(timestart >= '.$tstart.' OR timestart + timeduration > '.$tstart.') AND timestart <= '.$tend;
 621     }
 622     else {
 623         $timeclause = 'timestart >= '.$tstart.' AND timestart <= '.$tend;
 624     }
 625     if(!empty($whereclause)) {
 626         // We have additional constraints
 627         $whereclause = $timeclause.' AND ('.$whereclause.')';
 628     }
 629     else {
 630         // Just basic time filtering
 631         $whereclause = $timeclause;
 632     }
 633
 634     if ($ignorehidden) {
 635         $whereclause .= ' AND visible = 1';
 636     }
 637
 638     return $whereclause;
 639 }
 640
 641 function calendar_top_controls($type, $data) {
 642     global $CFG, $CALENDARDAYS, $THEME;
 643     $content = '';
 644     if(!isset($data['d'])) {
 645         $data['d'] = 1;
 646     }
 647
 648     // Ensure course id passed if relevant
 649     // Required due to changes in view/lib.php mainly (calendar_session_vars())
 650     $courseid = '';
 651     if (!empty($data['id'])) {
 652         $courseid = '&amp;course='.$data['id'];
 653     }
 654
 655     if(!checkdate($data['m'], $data['d'], $data['y'])) {
 656         $time = time();
 657     }
 658     else {
 659         $time = make_timestamp($data['y'], $data['m'], $data['d']);
 660     }
 661     $date = usergetdate($time);
 662
 663     $data['m'] = $date['mon'];
 664     $data['y'] = $date['year'];
 665
 666     //Accessibility: calendar block controls, replaced <table> with <div>.
 667     //$nexttext = link_arrow_right(get_string('monthnext', 'access'), $url='', $accesshide=true);
 668     //$prevtext = link_arrow_left(get_string('monthprev', 'access'), $url='', $accesshide=true);
 669
 670     switch($type) {
 671         case 'frontpage':
 672             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 673             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 674             $nextlink = calendar_get_link_next(get_string('monthnext', 'access'), 'index.php?', 0, $nextmonth, $nextyear, $accesshide=true);
 675             $prevlink = calendar_get_link_previous(get_string('monthprev', 'access'), 'index.php?', 0, $prevmonth, $prevyear, true);
 676             $content .= "\n".'<div class="calendar-controls">'. $prevlink;
 677             $content .= '<span class="hide"> | </span><span class="current"><a href="'.calendar_get_link_href(CALENDAR_URL.'view.php?view=month'.$courseid.'&amp;', 1, $data['m'], $data['y']).'">'.userdate($time, get_string('strftimemonthyear')).'</a></span>';
 678             $content .= '<span class="hide"> | </span>'. $nextlink ."\n";
 679             $content .= "<span class=\"clearer\"><!-- --></span></div>\n";
 680         break;
 681         case 'course':
 682             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 683             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 684             $nextlink = calendar_get_link_next(get_string('monthnext', 'access'), 'view.php?id='.$data['id'].'&amp;', 0, $nextmonth, $nextyear, $accesshide=true);
 685             $prevlink = calendar_get_link_previous(get_string('monthprev', 'access'), 'view.php?id='.$data['id'].'&amp;', 0, $prevmonth, $prevyear, true);
 686             $content .= "\n".'<div class="calendar-controls">'. $prevlink;
 687             $content .= '<span class="hide"> | </span><span class="current"><a href="'.calendar_get_link_href(CALENDAR_URL.'view.php?view=month'.$courseid.'&amp;', 1, $data['m'], $data['y']).'">'.userdate($time, get_string('strftimemonthyear')).'</a></span>';
 688             $content .= '<span class="hide"> | </span>'. $nextlink ."\n";
 689             $content .= "<span class=\"clearer\"><!-- --></span></div>\n";
 690         break;
 691         case 'upcoming':
 692             $content .= '<div style="text-align: center;"><a href="'.CALENDAR_URL.'view.php?view=upcoming"'.$courseid.'>'.userdate($time, get_string('strftimemonthyear'))."</a></div>\n";
 693         break;
 694         case 'display':
 695             $content .= '<div style="text-align: center;"><a href="'.calendar_get_link_href(CALENDAR_URL.'view.php?view=month'.$courseid.'&amp;', 1, $data['m'], $data['y']).'">'.userdate($time, get_string('strftimemonthyear'))."</a></div>\n";
 696         break;
 697         case 'month':
 698             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 699             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 700             $prevdate = make_timestamp($prevyear, $prevmonth, 1);
 701             $nextdate = make_timestamp($nextyear, $nextmonth, 1);
 702             $content .= "\n".'<div class="calendar-controls">';
 703             $content .= calendar_get_link_previous(userdate($prevdate, get_string('strftimemonthyear')), 'view.php?view=month'.$courseid.'&amp;', 1, $prevmonth, $prevyear);
 704             $content .= '<span class="hide"> | </span><span class="current">'.userdate($time, get_string('strftimemonthyear'))."</span>\n";
 705             $content .= '<span class="hide"> | </span>'.calendar_get_link_next(userdate($nextdate, get_string('strftimemonthyear')), 'view.php?view=month'.$courseid.'&amp;', 1, $nextmonth, $nextyear);
 706             $content .= "<span class=\"clearer\"><!-- --></span></div>\n";
 707         break;
 708         case 'day':
 709             $data['d'] = $date['mday']; // Just for convenience
 710             $prevdate = usergetdate(make_timestamp($data['y'], $data['m'], $data['d'] - 1));
 711             $nextdate = usergetdate(make_timestamp($data['y'], $data['m'], $data['d'] + 1));
 712             $prevname = calendar_wday_name($CALENDARDAYS[$prevdate['wday']]);
 713             $nextname = calendar_wday_name($CALENDARDAYS[$nextdate['wday']]);
 714             $content .= "\n".'<div class="calendar-controls">';
 715             $content .= calendar_get_link_previous($prevname, 'view.php?view=day'.$courseid.'&amp;', $prevdate['mday'], $prevdate['mon'], $prevdate['year']);
 716
 717             // Get the format string
 718             $text = get_string('strftimedaydate');
 719             /*
 720             // Regexp hackery to make a link out of the month/year part
 721             $text = ereg_replace('(%B.+%Y|%Y.+%B|%Y.+%m[^ ]+)', '<a href="'.calendar_get_link_href('view.php?view=month&amp;', 1, $data['m'], $data['y']).'">\\1</a>', $text);
 722             $text = ereg_replace('(F.+Y|Y.+F|Y.+m[^ ]+)', '<a href="'.calendar_get_link_href('view.php?view=month&amp;', 1, $data['m'], $data['y']).'">\\1</a>', $text);
 723             */
 724             // Replace with actual values and lose any day leading zero
 725             $text = userdate($time, $text);
 726             // Print the actual thing
 727             $content .= '<span class="hide"> | </span><span class="current">'.$text.'</span>';
 728
 729             $content .= '<span class="hide"> | </span>'. calendar_get_link_next($nextname, 'view.php?view=day'.$courseid.'&amp;', $nextdate['mday'], $nextdate['mon'], $nextdate['year']);
 730             $content .= "<span class=\"clearer\"><!-- --></span></div>\n";
 731         break;
 732     }
 733     return $content;
 734 }
 735
 736 function calendar_filter_controls($type, $vars = NULL, $course = NULL, $courses = NULL) {
 737     global $CFG, $SESSION, $USER;
 738
 739     $groupevents = true;
 740     $getvars = '';
 741
 742     $id = optional_param( 'id',0,PARAM_INT );
 743
 744     switch($type) {
 745         case 'event':
 746         case 'upcoming':
 747         case 'day':
 748         case 'month':
 749             $getvars = '&amp;from='.$type;
 750         break;
 751         case 'course':
 752             if ($id > 0) {
 753                 $getvars = '&amp;from=course&amp;id='.$id;
 754             } else {
 755                 $getvars = '&amp;from=course';
 756             }
 757             if (isset($course->groupmode) and $course->groupmode == NOGROUPS and $course->groupmodeforce) {
 758                 $groupevents = false;
 759             }
 760         break;
 761     }
 762
 763     if (!empty($vars)) {
 764         $getvars .= '&amp;'.$vars;
 765     }
 766
 767     $content = '<table>';
 768
 769     $content .= '<tr>';
 770     if($SESSION->cal_show_global) {
 771         $content .= '<td class="eventskey event_global" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hideglobal', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showglobal'.$getvars."'".'" /></td>';
 772         $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showglobal'.$getvars.'" title="'.get_string('tt_hideglobal', 'calendar').'">'.get_string('global', 'calendar').'</a></td>'."\n";
 773     }
 774     else {
 775         $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showglobal', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showglobal'.$getvars."'".'" /></td>';
 776         $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showglobal'.$getvars.'" title="'.get_string('tt_showglobal', 'calendar').'">'.get_string('global', 'calendar').'</a></td>'."\n";
 777     }
 778     $tr = '';
 779
 780     if(!empty($USER->id) && !isguest()) {
 781
 782         $content .= $tr;
 783         $tr = $tr ? '' : "</tr>\n<tr>";
 784
 785         if($groupevents) {
 786
 787             // This course MIGHT have group events defined, so show the filter
 788             if($SESSION->cal_show_groups) {
 789                 $content .= '<td class="eventskey event_group" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hidegroups', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showgroups'.$getvars."'".'" /></td>';
 790                 $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showgroups'.$getvars.'" title="'.get_string('tt_hidegroups', 'calendar').'">'.get_string('group', 'calendar').'</a></td>'."\n";
 791             } else {
 792                 $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showgroups', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showgroups'.$getvars."'".'" /></td>';
 793                 $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showgroups'.$getvars.'" title="'.get_string('tt_showgroups', 'calendar').'">'.get_string('group', 'calendar').'</a></td>'."\n";
 794             }
 795         } else {
 796
 797             // This course CANNOT have group events, so lose the filter
 798             $content .= '<td style="width: 11px;"></td><td>&nbsp;</td>'."\n";
 799         }
 800
 801         $content .= $tr;
 802         $tr = $tr ? '' : "</tr>\n<tr>";
 803
 804         if ($SESSION->cal_show_user) {
 805             $content .= '<td class="eventskey event_user" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hideuser', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showuser'.$getvars."'".'" /></td>';
 806             $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showuser'.$getvars.'" title="'.get_string('tt_hideuser', 'calendar').'">'.get_string('user', 'calendar').'</a></td>'."\n";
 807         } else {
 808             $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showuser', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showuser'.$getvars."'".'" /></td>';
 809             $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showuser'.$getvars.'" title="'.get_string('tt_showuser', 'calendar').'">'.get_string('user', 'calendar').'</a></td>'."\n";
 810         }
 811     }
 812
 813     // Remove global SITE ID from courses array as do not want to display this
 814     if (!empty($courses)) {
 815         $key = array_search(SITEID, $courses);
 816         if ($key !== false) {
 817             unset($courses[$key]);
 818         }
 819     }
 820
 821     if (empty($courses) || count($courses) == 1) {
 822
 823         // If not multiple courses then just display default single course colour highlighting
 824         $content .= $tr;
 825         $tr = $tr ? '' : "</tr>\n<tr>";
 826
 827         if($SESSION->cal_show_course) {
 828             $content .= '<td class="eventskey event_course" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hidecourse', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showcourses'.$getvars."'".'" /></td>';
 829             $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showcourses'.$getvars.'" title="'.get_string('tt_hidecourse', 'calendar').'">'.get_string('course', 'calendar').'</a></td>'."\n";
 830         }
 831         else {
 832             $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_showcourse', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showcourses'.$getvars."'".'" /></td>';
 833             $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showcourses'.$getvars.'" title="'.get_string('tt_showcourse', 'calendar').'">'.get_string('course', 'calendar').'</a></td>'."\n";
 834         }
 835     } else {
 836
 837         // Otherwise display list of course shortnames and relevant colours
 838         // Get list of course shortnames (Limit to 12 for now - who would have more than that?)
 839         $select = 'id in ('.implode(',', $courses).')';
 840         $sort = 'id';
 841         $fields = 'id, shortname';
 842         $courseshortnames = get_records_select('course', $select, $sort, $fields, 0, 12);
 843
 844         for ($i = 0; $i < CALENDAR_MAXCOURSES; $i++) {
 845
 846             // Concatenate shortnames if there are more than 3 courses
 847             $strshortnames = '';
 848             $n = 0;
 849             for ($j = $i; $j < count($courses); $j += CALENDAR_MAXCOURSES) {
 850                 $strshortnames .= ', <a title="" href="'.$CFG->wwwroot.'/course/view.php?id='.$courses[$j].'">'.(!empty($courseshortnames[$courses[$j]]->shortname) ? $courseshortnames[$courses[$j]]->shortname : $courses[$j]).'</a>';
 851                 $n++;
 852             }
 853
 854             if ($n) {
 855
 856                 $content .= $tr;
 857                 $tr = $tr ? '' : "</tr>\n<tr>";
 858
 859                 if ($n < 2) {
 860                     $strcourse = get_string('course', 'calendar');
 861                 } else {
 862                     $strcourse = get_string('courses', 'calendar');
 863                 }
 864
 865                 if($SESSION->cal_show_course) {
 866                     $content .= '<td class="eventskey event_course'.$i.'" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hidecourse', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showcourses'.$getvars."'".'" /></td>';
 867                     $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showcourses'.$getvars.'" title="'.get_string('tt_hidecourse', 'calendar').'">'.$strcourse.'</a>: '.substr($strshortnames, 2).'</td>'."\n";
 868                 }
 869                 else {
 870                     $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_showcourse', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showcourses'.$getvars."'".'" /></td>';
 871                     $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showcourses'.$getvars.'" title="'.get_string('tt_showcourse', 'calendar').'">'.$strcourse.'</a>: '.substr($strshortnames, 2).'</td>'."\n";
 872                 }
 873             }
 874         }
 875     }
 876     $content .= "</tr>\n</table>\n";
 877
 878     return $content;
 879 }
 880
 881 function calendar_day_representation($tstamp, $now = false, $usecommonwords = true) {
 882
 883     static $shortformat;
 884     if(empty($shortformat)) {
 885         $shortformat = get_string('strftimedayshort');
 886     }
 887
 888     if($now === false) {
 889         $now = time();
 890     }
 891
 892     // To have it in one place, if a change is needed
 893     $formal = userdate($tstamp, $shortformat);
 894
 895     $datestamp = usergetdate($tstamp);
 896     $datenow   = usergetdate($now);
 897
 898     if($usecommonwords == false) {
 899         // We don't want words, just a date
 900         return $formal;
 901     }
 902     else if($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday']) {
 903         // Today
 904         return get_string('today', 'calendar');
 905     }
 906     else if(
 907         ($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday'] - 1 ) ||
 908         ($datestamp['year'] == $datenow['year'] - 1 && $datestamp['mday'] == 31 && $datestamp['mon'] == 12 && $datenow['yday'] == 1)
 909         ) {
 910         // Yesterday
 911         return get_string('yesterday', 'calendar');
 912     }
 913     else if(
 914         ($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday'] + 1 ) ||
 915         ($datestamp['year'] == $datenow['year'] + 1 && $datenow['mday'] == 31 && $datenow['mon'] == 12 && $datestamp['yday'] == 1)
 916         ) {
 917         // Tomorrow
 918         return get_string('tomorrow', 'calendar');
 919     }
 920     else {
 921         return $formal;
 922     }
 923 }
 924
 925 function calendar_time_representation($time) {
 926     static $langtimeformat = NULL;
 927     if($langtimeformat === NULL) {
 928         $langtimeformat = get_string('strftimetime');
 929     }
 930     $timeformat = get_user_preferences('calendar_timeformat');
 931     if(empty($timeformat)){
 932         $timeformat = get_config(NULL,'calendar_site_timeformat');
 933     }
 934     // The ? is needed because the preference might be present, but empty
 935     return userdate($time, empty($timeformat) ? $langtimeformat : $timeformat);
 936 }
 937
 938 function calendar_get_link_href($linkbase, $d, $m, $y) {
 939     if(empty($linkbase)) return '';
 940     $paramstr = '';
 941     if(!empty($d)) $paramstr .= '&amp;cal_d='.$d;
 942     if(!empty($m)) $paramstr .= '&amp;cal_m='.$m;
 943     if(!empty($y)) $paramstr .= '&amp;cal_y='.$y;
 944     if(!empty($paramstr)) $paramstr = substr($paramstr, 5);
 945     return $linkbase.$paramstr;
 946 }
 947
 948 function calendar_get_link_tag($text, $linkbase, $d, $m, $y) {
 949     $href = calendar_get_link_href($linkbase, $d, $m, $y);
 950     if(empty($href)) return $text;
 951     return '<a href="'.$href.'">'.$text.'</a>';
 952 }
 953
 954 /**
 955  * Build and return a previous month HTML link, with an arrow.
 956  * @param string $text The text label.
 957  * @param string $linkbase The URL stub.
 958  * @param int $d $m $y Day of month, month and year numbers.
 959  * @param bool $accesshide Default visible, or hide from all except screenreaders.
 960  * @return string HTML string.
 961  */
 962 function calendar_get_link_previous($text, $linkbase, $d, $m, $y, $accesshide=false) {
 963     $href = calendar_get_link_href($linkbase, $d, $m, $y);
 964     if(empty($href)) return $text;
 965     return link_arrow_left($text, $href, $accesshide, 'previous');
 966 }
 967
 968 /**
 969  * Build and return a next month HTML link, with an arrow.
 970  * @param string $text The text label.
 971  * @param string $linkbase The URL stub.
 972  * @param int $d $m $y Day of month, month and year numbers.
 973  * @param bool $accesshide Default visible, or hide from all except screenreaders.
 974  * @return string HTML string.
 975  */
 976 function calendar_get_link_next($text, $linkbase, $d, $m, $y, $accesshide=false) {
 977     $href = calendar_get_link_href($linkbase, $d, $m, $y);
 978     if(empty($href)) return $text;
 979     return link_arrow_right($text, $href, $accesshide, 'next');
 980 }
 981
 982 function calendar_wday_name($englishname) {
 983     return get_string(strtolower($englishname), 'calendar');
 984 }
 985
 986 function calendar_days_in_month($month, $year) {
 987    return intval(date('t', mktime(0, 0, 0, $month, 1, $year)));
 988 }
 989
 990 function calendar_get_sideblock_upcoming($events, $linkhref = NULL) {
 991     $content = '';
 992     $lines = count($events);
 993     if (!$lines) {
 994         return $content;
 995     }
 996
 997     for ($i = 0; $i < $lines; ++$i) {
 998         if (!isset($events[$i]->time)) {   // Just for robustness
 999             continue;
1000         }
1001         $events[$i] = calendar_add_event_metadata($events[$i]);
1002         $content .= '<div class="event"><span class="icon c0">'.$events[$i]->icon.'</span> ';
1003         if (!empty($events[$i]->referer)) {
1004             // That's an activity event, so let's provide the hyperlink
1005             $content .= $events[$i]->referer;
1006         } else {
1007             if(!empty($linkhref)) {
1008                 $ed = usergetdate($events[$i]->timestart);
1009                 $href = calendar_get_link_href(CALENDAR_URL.$linkhref, $ed['mday'], $ed['mon'], $ed['year']);
1010                 $content .= '<a href="'.$href.'#event_'.$events[$i]->id.'">'.$events[$i]->name.'</a>';
1011             }
1012             else {
1013                 $content .= $events[$i]->name;
1014             }
1015         }
1016         $events[$i]->time = str_replace('&raquo;', '<br />&raquo;', $events[$i]->time);
1017         $content .= '<div class="date">'.$events[$i]->time.'</div></div>';
1018         if ($i < $lines - 1) $content .= '<hr />';
1019     }
1020
1021     return $content;
1022 }
1023
1024 function calendar_add_month($month, $year) {
1025     if($month == 12) {
1026         return array(1, $year + 1);
1027     }
1028     else {
1029         return array($month + 1, $year);
1030     }
1031 }
1032
1033 function calendar_sub_month($month, $year) {
1034     if($month == 1) {
1035         return array(12, $year - 1);
1036     }
1037     else {
1038         return array($month - 1, $year);
1039     }
1040 }
1041
1042 function calendar_events_by_day($events, $month, $year, &$eventsbyday, &$durationbyday, &$typesbyday, &$courses) {
1043     $eventsbyday = array();
1044     $typesbyday = array();
1045     $durationbyday = array();
1046
1047     if($events === false) {
1048         return;
1049     }
1050
1051     foreach($events as $event) {
1052
1053         $startdate = usergetdate($event->timestart);
1054         // Set end date = start date if no duration
1055         if ($event->timeduration) {
1056             $enddate   = usergetdate($event->timestart + $event->timeduration - 1);
1057         } else {
1058             $enddate = $startdate;
1059         }
1060
1061         // Simple arithmetic: $year * 13 + $month is a distinct integer for each distinct ($year, $month) pair
1062         if(!($startdate['year'] * 13 + $startdate['mon'] <= $year * 13 + $month) && ($enddate['year'] * 13 + $enddate['mon'] >= $year * 13 + $month)) {
1063             // Out of bounds
1064             continue;
1065         }
1066
1067         $eventdaystart = intval($startdate['mday']);
1068
1069         if($startdate['mon'] == $month && $startdate['year'] == $year) {
1070             // Give the event to its day
1071             $eventsbyday[$eventdaystart][] = $event->id;
1072
1073             // Mark the day as having such an event
1074             if($event->courseid == SITEID && $event->groupid == 0) {
1075                 $typesbyday[$eventdaystart]['startglobal'] = true;
1076                 // Set event class for global event
1077                 $events[$event->id]->class = 'event_global';
1078             }
1079             else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {
1080                 $typesbyday[$eventdaystart]['startcourse'] = true;
1081                 // Set event class for course event
1082                 $events[$event->id]->class = 'event_course'.array_search($event->courseid, $courses) % CALENDAR_MAXCOURSES;
1083             }
1084             else if($event->groupid) {
1085                 $typesbyday[$eventdaystart]['startgroup'] = true;
1086                 // Set event class for group event
1087                 $events[$event->id]->class = 'event_group';
1088             }
1089             else if($event->userid) {
1090                 $typesbyday[$eventdaystart]['startuser'] = true;
1091                 // Set event class for user event
1092                 $events[$event->id]->class = 'event_user';
1093             }
1094         }
1095
1096         if($event->timeduration == 0) {
1097             // Proceed with the next
1098             continue;
1099         }
1100
1101         // The event starts on $month $year or before. So...
1102         $lowerbound = $startdate['mon'] == $month && $startdate['year'] == $year ? intval($startdate['mday']) : 0;
1103
1104         // Also, it ends on $month $year or later...
1105         $upperbound = $enddate['mon'] == $month && $enddate['year'] == $year ? intval($enddate['mday']) : calendar_days_in_month($month, $year);
1106
1107         // Mark all days between $lowerbound and $upperbound (inclusive) as duration
1108         for($i = $lowerbound + 1; $i <= $upperbound; ++$i) {
1109             $durationbyday[$i][] = $event->id;
1110             if($event->courseid == SITEID && $event->groupid == 0) {
1111                 $typesbyday[$i]['durationglobal'] = true;
1112             }
1113             else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {
1114                 $typesbyday[$i]['durationcourse'] = true;
1115             }
1116             else if($event->groupid) {
1117                 $typesbyday[$i]['durationgroup'] = true;
1118             }
1119             else if($event->userid) {
1120                 $typesbyday[$i]['durationuser'] = true;
1121             }
1122         }
1123
1124     }
1125     return;
1126 }
1127
1128 function calendar_get_module_cached(&$coursecache, $modulename, $instance) {
1129     $module = get_coursemodule_from_instance($modulename, $instance);
1130
1131     if($module === false) return false;
1132     if(!calendar_get_course_cached($coursecache, $module->course)) {
1133         return false;
1134     }
1135     return $module;
1136 }
1137
1138 function calendar_get_course_cached(&$coursecache, $courseid) {
1139     if(!isset($coursecache[$courseid])) {
1140         $coursecache[$courseid] = get_record('course', 'id', $courseid);
1141     }
1142     return $coursecache[$courseid];
1143 }
1144
1145 function calendar_session_vars() {
1146     global $SESSION, $USER;
1147
1148     if(!empty($USER->id) && isset($USER->realuser) && !isset($SESSION->cal_loggedinas)) {
1149         // We just logged in as someone else, update the filtering
1150         unset($SESSION->cal_users_shown);
1151         unset($SESSION->cal_courses_shown);
1152         $SESSION->cal_loggedinas = true;
1153         if(intval(get_user_preferences('calendar_persistflt', 0))) {
1154             calendar_set_filters_status(get_user_preferences('calendar_savedflt', 0xff));
1155         }
1156     }
1157     else if(!empty($USER->id) && !isset($USER->realuser) && isset($SESSION->cal_loggedinas)) {
1158         // We just logged back to our real self, update again
1159         unset($SESSION->cal_users_shown);
1160         unset($SESSION->cal_courses_shown);
1161         unset($SESSION->cal_loggedinas);
1162         if(intval(get_user_preferences('calendar_persistflt', 0))) {
1163             calendar_set_filters_status(get_user_preferences('calendar_savedflt', 0xff));
1164         }
1165     }
1166
1167     if(!isset($SESSION->cal_course_referer)) {
1168         $SESSION->cal_course_referer = 0;
1169     }
1170     if(!isset($SESSION->cal_show_global)) {
1171         $SESSION->cal_show_global = true;
1172     }
1173     if(!isset($SESSION->cal_show_groups)) {
1174         $SESSION->cal_show_groups = true;
1175     }
1176     if(!isset($SESSION->cal_show_course)) {
1177         $SESSION->cal_show_course = true;
1178     }
1179     if(!isset($SESSION->cal_show_user)) {
1180         $SESSION->cal_show_user = true;
1181     }
1182    // if(empty($SESSION->cal_courses_shown)) {
1183         $SESSION->cal_courses_shown = calendar_get_default_courses(true);
1184     //}
1185     if(empty($SESSION->cal_users_shown)) {
1186         // The empty() instead of !isset() here makes a whole world of difference,
1187         // as it will automatically change to the user's id when the user first logs
1188         // in. With !isset(), it would never do that.
1189         $SESSION->cal_users_shown = !empty($USER->id) ? $USER->id : false;
1190     }
1191     else if(is_numeric($SESSION->cal_users_shown) && !empty($USER->id) && $SESSION->cal_users_shown != $USER->id) {
1192         // Follow the white rabbit, for example if a teacher logs in as a student
1193         $SESSION->cal_users_shown = $USER->id;
1194     }
1195 }
1196
1197 function calendar_overlib_html() {
1198     return '<div id="overDiv" style="position: absolute; visibility: hidden; z-index:1000;"></div>'
1199           .'<script type="text/javascript" src="'.CALENDAR_URL.'overlib.cfg.php"></script>';
1200 }
1201
1202 function calendar_set_referring_course($courseid) {
1203     global $SESSION;
1204     $SESSION->cal_course_referer = intval($courseid);
1205 }
1206
1207 function calendar_set_filters(&$courses, &$group, &$user, $courseeventsfrom = NULL, $groupeventsfrom = NULL, $ignorefilters = false) {
1208     global $SESSION, $USER, $CFG;
1209
1210     // Insidious bug-wannabe: setting $SESSION->cal_courses_shown to $course->id would cause
1211     // the code to function incorrectly UNLESS we convert it to an integer. One case where
1212     // PHP's loose type system works against us.
1213     if(is_string($SESSION->cal_courses_shown)) {
1214         $SESSION->cal_courses_shown = intval($SESSION->cal_courses_shown);
1215     }
1216
1217     if($courseeventsfrom === NULL) {
1218         $courseeventsfrom = $SESSION->cal_courses_shown;
1219     }
1220     if($groupeventsfrom === NULL) {
1221         $groupeventsfrom = $SESSION->cal_courses_shown;
1222     }
1223
1224     if(($SESSION->cal_show_course && $SESSION->cal_show_global) || $ignorefilters) {
1225         if(is_int($courseeventsfrom)) {
1226             $courses = array(SITEID, $courseeventsfrom);
1227         }
1228         else if(is_array($courseeventsfrom)) {
1229             $courses = array_keys($courseeventsfrom);
1230             $courses[] = SITEID;
1231         }
1232     }
1233     else if($SESSION->cal_show_course) {
1234         if(is_int($courseeventsfrom)) {
1235             $courses = array($courseeventsfrom);
1236         }
1237         else if(is_array($courseeventsfrom)) {
1238             $courses = array_keys($courseeventsfrom);
1239         }
1240         $courses = array_diff($courses, array(SITEID));
1241     }
1242     else if($SESSION->cal_show_global) {
1243         $courses = array(SITEID);
1244     }
1245     else {
1246         $courses = false;
1247     }
1248     //BUG 6130 clean $courses array as SESSION has bad entries.
1249     // [pj] TODO: See if this has to do with my new change in get_default_courses and can be taken out
1250     if (is_array($courses)) {
1251         foreach ($courses as $index => $value) {
1252             if (empty($value)) unset($courses[$index]);
1253         }
1254
1255         // Sort courses for consistent colour highlighting
1256         // Effectively ignoring SITEID as setting as last course id
1257         $key = array_search(SITEID, $courses);
1258         if ($key !== false) {
1259             unset($courses[$key]);
1260             sort($courses);
1261             $courses[] = SITEID;
1262         } else {
1263             sort($courses);
1264         }
1265     }
1266
1267     if($SESSION->cal_show_user || $ignorefilters) {
1268         // This doesn't work for arrays yet (maybe someday it will)
1269         $user = $SESSION->cal_users_shown;
1270     }
1271     else {
1272         $user = false;
1273     }
1274     if($SESSION->cal_show_groups || $ignorefilters) {
1275         if(is_int($groupeventsfrom)) {
1276             $groupcourses = array($groupeventsfrom);
1277         }
1278         else if(is_array($groupeventsfrom)) {
1279             $groupcourses = array_keys($groupeventsfrom);
1280         }
1281
1282         // XXX TODO: not sure how to replace $CFG->calendar_adminseesall
1283         if(has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_SYSTEM, SITEID)) && !empty($CFG->calendar_adminseesall)) {
1284             $group = true;
1285         }
1286         else {
1287             $grouparray = array();
1288
1289             // We already have the courses to examine in $courses
1290             // For each course...
1291
1292             foreach($groupcourses as $courseid) {
1293
1294                 // If the user is an editing teacher in there,
1295                 if(!empty($USER->id) && has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, $courseid))) {
1296                     // If this course has groups, show events from all of them
1297                     if(is_int($groupeventsfrom)) {
1298                         $courserecord = get_record('course', 'id', $courseid);
1299                         if ($courserecord->groupmode != NOGROUPS || !$courserecord->groupmodeforce) {
1300                             $groupids[] = $courseid;
1301                         }
1302                     }
1303                     else if(isset($SESSION->cal_courses_shown[$courseid]) && ($SESSION->cal_courses_shown[$courseid]->groupmode != NOGROUPS || !$SESSION->cal_courses_shown[$courseid]->groupmodeforce)) {
1304                         $groupids[] = $courseid;
1305                     }
1306                 }
1307
1308                 // Otherwise (not editing teacher) show events from the group he is a member of
1309                 else if(isset($USER->groupmember[$courseid])) {
1310                     //changed to 2D array
1311                     foreach ($USER->groupmember[$courseid] as $groupid){
1312                         $grouparray[] = $groupid;
1313                     }
1314                 }
1315             }
1316
1317             if (!empty($groupids)) {
1318                 $sql = "SELECT id, groupid
1319                         FROM {$CFG->prefix}groups_courses_groups
1320                         WHERE courseid IN (".implode(',', $groupids).')';
1321
1322                 if ($grouprecords= get_records_sql($sql)) {
1323                     $grouparray = array_merge($grouparray, array_keys($grouprecords));
1324                 }
1325             }
1326
1327             if(empty($grouparray)) {
1328                 $group = false;
1329             }
1330             else {
1331                 $group = $grouparray;
1332             }
1333         }
1334
1335     }
1336     else {
1337         $group = false;
1338     }
1339 }
1340
1341 function calendar_edit_event_allowed($event) {
1342
1343     global $USER;
1344
1345     // can not be using guest account
1346     if ($USER->username == "guest") {
1347         return false;
1348     }
1349
1350     $sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID);
1351     // if user has manageentries at site level, return true
1352     if (has_capability('moodle/calendar:manageentries', $sitecontext)) {
1353         return true;
1354     }
1355
1356     // if groupid is set, it's definitely a group event
1357     if ($event->groupid) {
1358         //TODO:check.
1359         if (! groups_group_exists($event->groupid)) {
1360             return false;
1361         }
1362
1363         // this is ok because if you have this capability at course level, you should be able
1364         // to edit group calendar too
1365         // there is no need to check membership, because if you have this capability
1366         // you will have a role in this group context
1367         return has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_GROUP, $event->groupid));
1368     } else if ($event->courseid) {
1369     // if groupid is not set, but course is set,
1370     // it's definiely a course event
1371         return has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, $event->courseid));
1372     } else if ($event->userid && $event->userid == $USER->id) {
1373     // if course is not set, but userid id set, it's a user event
1374         return (has_capability('moodle/calendar:manageownentries', $sitecontext));
1375     }
1376     return false;
1377 }
1378
1379 function calendar_get_default_courses($ignoreref = false) {
1380     global $USER, $CFG, $SESSION;
1381
1382     if(!empty($SESSION->cal_course_referer) && !$ignoreref) {
1383         return array($SESSION->cal_course_referer => 1);
1384     }
1385
1386     if(empty($USER->id)) {
1387         return array();
1388     }
1389
1390     $courses = array();
1391     if (has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_SYSTEM, SITEID))) {
1392         if (!empty($CFG->calendar_adminseesall)) {
1393             $courses = get_records_sql('SELECT id, 1 FROM '.$CFG->prefix.'course');
1394             return $courses;
1395         }
1396     }
1397
1398     if (isset($CFG->adminseesall)) {
1399         $courses = get_my_courses($USER->id, null, null, $CFG->adminseesall);
1400     }
1401     else {
1402         $courses = get_my_courses($USER->id, null, null, false);
1403     }
1404
1405     return $courses;
1406 }
1407
1408 function calendar_preferences_button() {
1409     global $CFG, $USER;
1410
1411     // Guests have no preferences
1412     if (empty($USER->id) || isguest()) {
1413         return '';
1414     }
1415
1416     return "<form $CFG->frametarget method=\"get\" ".
1417            " action=\"$CFG->wwwroot/calendar/preferences.php\">".
1418            "<div><input type=\"submit\" value=\"".get_string("preferences", "calendar")." ...\" /></div></form>";
1419 }
1420
1421 function calendar_format_event_time($event, $now, $morehref, $usecommonwords = true, $showtime=0) {
1422     $startdate = usergetdate($event->timestart);
1423     $enddate = usergetdate($event->timestart + $event->timeduration);
1424     $usermidnightstart = usergetmidnight($event->timestart);
1425
1426     if($event->timeduration) {
1427         // To avoid doing the math if one IF is enough :)
1428         $usermidnightend = usergetmidnight($event->timestart + $event->timeduration);
1429     }
1430     else {
1431         $usermidnightend = $usermidnightstart;
1432     }
1433
1434     // OK, now to get a meaningful display...
1435     // First of all we have to construct a human-readable date/time representation
1436
1437     if($event->timeduration) {
1438         // It has a duration
1439         if($usermidnightstart == $usermidnightend ||
1440            ($event->timestart == $usermidnightstart) && ($event->timeduration == 86400 || $event->timeduration == 86399) ||
1441            ($event->timestart + $event->timeduration <= $usermidnightstart + 86400)) {
1442             // But it's all on the same day
1443             $timestart = calendar_time_representation($event->timestart);
1444             $timeend = calendar_time_representation($event->timestart + $event->timeduration);
1445             $time = $timestart.' <strong>&raquo;</strong> '.$timeend;
1446
1447             if ($event->timestart == $usermidnightstart && ($event->timeduration == 86400 || $event->timeduration == 86399)) {
1448                 $time = get_string('allday', 'calendar');
1449             }
1450
1451             // Set printable representation
1452             if (!$showtime) {
1453                 $day = calendar_day_representation($event->timestart, $now, $usecommonwords);
1454                 $eventtime = calendar_get_link_tag($day, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $enddate['mday'], $enddate['mon'], $enddate['year']).', '.$time;
1455             } else {
1456                 $eventtime = $time;
1457             }
1458         } else {
1459             // It spans two or more days
1460             $daystart = calendar_day_representation($event->timestart, $now, $usecommonwords).', ';
1461             if ($showtime == $usermidnightstart) {
1462                 $daystart = '';
1463             }
1464             $timestart = calendar_time_representation($event->timestart);
1465             $dayend = calendar_day_representation($event->timestart + $event->timeduration, $now, $usecommonwords).', ';
1466             if ($showtime == $usermidnightend) {
1467                 $dayend = '';
1468             }
1469             $timeend = calendar_time_representation($event->timestart + $event->timeduration);
1470
1471             // Set printable representation
1472             if ($now >= $usermidnightstart && $now < ($usermidnightstart + 86400)) {
1473                 $eventtime = $timestart.' <strong>&raquo;</strong> '.calendar_get_link_tag($dayend, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $enddate['mday'], $enddate['mon'], $enddate['year']).
1474                 $timeend;
1475             } else {
1476                 $eventtime = calendar_get_link_tag($daystart, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $startdate['mday'], $startdate['mon'], $startdate['year']).
1477                 $timestart.' <strong>&raquo;</strong> '.calendar_get_link_tag($dayend, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $enddate['mday'], $enddate['mon'], $enddate['year']).
1478                 $timeend;
1479             }
1480         }
1481     } else {
1482         $time = ' ';
1483
1484         // Set printable representation
1485         if (!$showtime) {
1486             $day = calendar_day_representation($event->timestart, $now, $usecommonwords);
1487             $eventtime = calendar_get_link_tag($day, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $startdate['mday'], $startdate['mon'], $startdate['year']).trim($time);
1488         } else {
1489             $eventtime = $time;
1490         }
1491     }
1492
1493     if($event->timestart + $event->timeduration < $now) {
1494         // It has expired
1495         $eventtime = '<span class="dimmed_text">'.str_replace(' href=', ' class="dimmed" href=', $eventtime).'</span>';
1496     }
1497
1498     return $eventtime;
1499 }
1500
1501 function calendar_print_month_selector($name, $selected) {
1502
1503     $months = array();
1504
1505     for ($i=1; $i<=12; $i++) {
1506         $months[$i] = userdate(gmmktime(12, 0, 0, $i, 15, 2000), '%B');
1507     }
1508
1509     choose_from_menu($months, $name, $selected, '');
1510 }
1511
1512 function calendar_get_filters_status() {
1513     global $SESSION;
1514
1515     $status = 0;
1516     if($SESSION->cal_show_global) {
1517         $status += 1;
1518     }
1519     if($SESSION->cal_show_course) {
1520         $status += 2;
1521     }
1522     if($SESSION->cal_show_groups) {
1523         $status += 4;
1524     }
1525     if($SESSION->cal_show_user) {
1526         $status += 8;
1527     }
1528     return $status;
1529 }
1530
1531 function calendar_set_filters_status($packed_bitfield) {
1532     global $SESSION, $USER;
1533
1534     if(!isset($USER) || empty($USER->id)) {
1535         return false;
1536     }
1537
1538     $SESSION->cal_show_global = ($packed_bitfield & 1);
1539     $SESSION->cal_show_course = ($packed_bitfield & 2);
1540     $SESSION->cal_show_groups = ($packed_bitfield & 4);
1541     $SESSION->cal_show_user   = ($packed_bitfield & 8);
1542
1543     return true;
1544 }
1545
1546 function calendar_get_allowed_types(&$allowed) {
1547     global $USER, $CFG, $SESSION;
1548     $sitecontext = get_context_instance(CONTEXT_SYSTEM);
1549     $allowed->user = has_capability('moodle/calendar:manageownentries', $sitecontext);
1550     $allowed->groups = false; // This may change just below
1551     $allowed->courses = false; // This may change just below
1552     $allowed->site = has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, SITEID));
1553
1554     if(!empty($SESSION->cal_course_referer) && $SESSION->cal_course_referer != SITEID && has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, $SESSION->cal_course_referer))) {
1555         $course = get_record('course', 'id', $SESSION->cal_course_referer);
1556
1557         $allowed->courses = array($course->id => 1);
1558
1559         if($course->groupmode != NOGROUPS || !$course->groupmodeforce) {
1560             $allowed->groups = get_groups($SESSION->cal_course_referer);
1561         }
1562     }
1563 }
1564
1565 /**
1566  * see if user can add calendar entries at all
1567  * used to print the "New Event" button
1568  * @return bool
1569  */
1570 function calendar_user_can_add_event() {
1571     calendar_get_allowed_types($allowed);
1572     return (bool)($allowed->user || $allowed->groups || $allowed->courses || $allowed->site);
1573 }
1574 ?>