Google Calendar Crappy Day Planner, Calendar Import Script

Code.gs

function importCalendar(){
  // Settings, because who needs function arguments?
  // --------------
  var calendarName = 'my.name@companydomain.com';
  var day = new Date();
  var firstHour = 8;
  var lastHour = 18;
  var canonicalStartRow = 2;
  var canonicalColumn = 2;
  var templateSheetName = 'Template';
  var rowsPerHour = 4;
  // --------------
  
  // Assumptions:
  // - A source calendar, <calendarName>.
  // - A spreadsheet that has:
  //   - A sheet that has a button that fires this script (eg. add an image, go 'Attach Script', fill in 'importCalendar').
  //   - A sheet called <templateSheetName> that has three columns:
  //     - A list of times, 08:00, 08:15, ..., until 17:00. 15-minute intervals (see rowsPerHour above).
  //     - A "canonical" column that has the calendar events dumped into it.
  //     - A "planner" column that will be user-editable, for day planner scribblings.
  //     - Conditional Formatting setting up for both of the latter columns, to have blocks
  //       automatically be highlighted if they have content in them. Not required, but good.
  
  // The actual script:
  
  // Misc date calculations needed for sheet names and calendar lookups.
  var dateString = day.getFullYear() + '-' + padStart(day.getMonth() + 1, 2, "0") + '-' + padStart(day.getDate(), 2, "0");
  var offset = padStart(day.getTimezoneOffset() / 60 * -1 * 100, 4, "0"); // Wrong, but good enough for AEST / AEDT (1000 / 1100).
  var start = new Date(dateString + 'T' + padStart('' + firstHour, 2, '0') + ':00:00+' + offset);
  var end = new Date(dateString + 'T' + padStart('' + (lastHour + 1), 2, '0') + ':00:00+' + offset);
  
  // Get or create the day's sheet.
  var doc = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = doc.getSheetByName(dateString);
  if (!sheet) {
    var template = doc.getSheetByName(templateSheetName);
    if (!template) throw ('Could not find template: ' + templateSheetName);
    doc.setActiveSheet(template);
    doc.duplicateActiveSheet();
    doc.renameActiveSheet(dateString);
    sheet = doc.getActiveSheet();
  }

  var calendar = CalendarApp.getCalendarById(calendarName); // or: CalendarApp.getDefaultCalendar();
  if (!calendar) calendar = CalendarApp.getCalendarsByName(calendarName)[0];
  if (!calendar) throw ('Could not find calendar: ' + calendarName);
  
  var events = calendar.getEvents(start, end);
  var eventDetails = [];
  for(var i = 0; i<events.length; i++){
    var event = events[i];

    if (event.isAllDayEvent()) continue;
    if (event.getMyStatus() == CalendarApp.GuestStatus.NO) continue;

    var startTime = event.getStartTime();
    var startRow = canonicalStartRow + ((startTime.getHours() - firstHour) * rowsPerHour) + Math.floor(startTime.getMinutes() / (60 / rowsPerHour));
    var endTime = event.getEndTime();
    var endRow = canonicalStartRow + ((endTime.getHours() - firstHour) * rowsPerHour) + Math.ceil(endTime.getMinutes() / (60 / rowsPerHour));
    if (startRow < canonicalStartRow) continue;
    if (startRow > canonicalStartRow + (lastHour * rowsPerHour)) continue;
    
    var contents = fill(new Array(endRow - startRow), "|");
    contents[0] = event.getTitle();
    if (contents.length > 1) {
      contents[contents.length - 1] = "|_______________";
    }
    eventDetails.push({ startRow: startRow, endRow: endRow, contents: contents });
  }

  // Write calendar details to spreadsheet
  for(var j = 0; j<eventDetails.length; j++){
    var details = eventDetails[j];
    var tempRange = sheet.getRange(details.startRow, canonicalColumn, details.contents.length);
    tempRange.setValues(details.contents.map(function(x) { return [x] }));
  }

  return eventDetails; // Y'know, if you ever want them.
}


// Why yes these *are* some copy-pasted ponyfills.

function padStart(s, intMaxLength, filler) {
  var str = s + '';
  var stringLength = str.length;
  if (intMaxLength <= stringLength) return str;
  var fillLen = intMaxLength - stringLength;
  while (filler.length < fillLen) {
    var fLen = filler.length;
    var remainingCodeUnits = fillLen - fLen;
    filler += fLen > remainingCodeUnits ? filler.slice(0, remainingCodeUnits) : filler;
  }
  var truncatedStringFiller = filler.length > fillLen ? slice(filler, 0, fillLen) : filler;
  return truncatedStringFiller + str;
}

function fill(array, value) {
  var O = Object(array);
  var len = O.length >>> 0;
  var start = undefined;
  var relativeStart = start >> 0;
  var k = relativeStart < 0 ? Math.max(len + relativeStart, 0) : Math.min(relativeStart, len);
  var relativeEnd = len;
  var final = relativeEnd < 0 ? Math.max(len + relativeEnd, 0) : Math.min(relativeEnd, len);
  while (k < final) {
    O[k] = value;
    k++;
  }
  return O;
}