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ical-to-json.js
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ical-to-json.js
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const ical = require("ical.js");
const fs = require("fs");
const groups = require("./data/groups");
const moment = require("moment-timezone");
const path = require("path");
const util = require("util");
const readdir = util.promisify(fs.readdir);
const readFile = util.promisify(fs.readFile);
const writeFile = util.promisify(fs.writeFile);
const icsDir = "ics";
const eventJson = "data/events.json";
function isIcsFile(filename) {
return filename.endsWith(".ics");
}
function keepIcsFiles(files) {
return files.filter(isIcsFile);
}
function buildFullPath(files) {
return files.map(file => path.join(icsDir, file));
}
function readAndParseCalendars(files) {
return Promise.all(files.map(readAndParseCalendar));
}
function readAndParseCalendar(file) {
return readFile(file)
.then(buffer => buffer.toString())
.then(ical.parse)
.then(jcalData => new ical.Component(jcalData))
.then(component => component.getAllSubcomponents("vevent"))
.then(vevents => vevents.map(vevent => expandVeventsAndConvertToJson(vevent, file)))
.then(flatten)
.catch(e => {
console.error(`Error parsing ${file}`, e);
return [];
});
}
// only expand one year into the future
let recurrenceCutoff = ical.Time.now();
recurrenceCutoff.addDuration(ical.Duration.fromSeconds(60 * 60 * 24 * 365));
function expandVeventsAndConvertToJson(vevent, file) {
const event = new ical.Event(vevent);
if (event.isRecurring()) {
let iter = event.iterator();
let occurrences = [];
for (let next = iter.next(); next; next = iter.next()) {
let occurrence = event.getOccurrenceDetails(next);
if (recurrenceCutoff.compare(occurrence.startDate) < 0) {
break;
}
// sometimes the recurring event loses the timezone info, making the events have the wrong times
// if so, copy the timezone from the original event
if (occurrence.startDate.timezone === undefined) {
occurrence.startDate.timezone = event.startDate.timezone;
}
if (occurrence.endDate.timezone === undefined) {
occurrence.endDate.timezone = event.endDate.timezone;
}
var json = updateTimes(eventToJson(event, file), occurrence);
occurrences.push(json);
}
return occurrences;
} else {
return [
eventToJson(event, file)
];
}
}
function eventToJson(event, file) {
const group = path.basename(file, ".ics");
const groupInfo = groups[group];
let mapQuery = event.location;
if (event.location) {
mapQuery = event.location.replace("(", " ").replace(")", " ");
}
return updateTimes({
description: event.description,
group: group,
groupName: groupInfo.name,
groupUrl: groupInfo.web,
location: event.location,
mapQuery: mapQuery,
summary: event.summary,
url: event.component.getFirstPropertyValue("url"),
}, event);
}
function updateTimes(json, event) {
var start = toUTC(event.startDate);
var end = toUTC(event.endDate);
var now = moment();
json.end = end.format();
json.expired = event.endDate.compare(ical.Time.now()) < 0;
json.expired = end.isBefore(now);
json.started = start.isBefore(now);
json.start = start.format();
return json;
}
function toUTC(icalJsTime) {
var tz = icalJsTime.timezone;
if (tz === "Z" || tz === undefined || tz === null) {
tz = "ETC/UTC";
}
return moment.tz(icalJsTime.toString(), tz).utc();
}
function flatten(list) {
return list.reduce(
(acc, item) => acc.concat(item),
[]
);
}
// sometimes recurring events generate 2 copies, so let's skip one
function dedupeJSON(list) {
return list.reduce(
(acc, item) => {
if (acc.length === 0 || !JSONEquals(acc[acc.length - 1], item)) {
acc.push(item);
}
return acc;
},
[]
);
}
function JSONEquals(a, b) {
return JSON.stringify(a) === JSON.stringify(b);
}
readdir(icsDir)
.then(keepIcsFiles)
.then(buildFullPath)
.then(readAndParseCalendars)
.then(flatten)
.then(events => events.filter(event => !event.expired))
.then(events => events.sort((a, b) => moment(a.start).isBefore(b.start) ? -1 : 1))
.then(dedupeJSON)
.then(events => writeFile(eventJson, JSON.stringify(events, undefined, 2)));