add ical generator

_includes/program-ical.11ty.js

@@ -0,0 +1,66 @@
+const { ICalCalendar, ICalCalendarMethod } = require('ical-generator')
+
+module.exports = class ProgramIcal {
+  getDate(date, time) {
+    const d = new Date(date);
+    const [ hours, mins ] = time.split(":");
+    d.setHours(hours);
+    d.setMinutes(mins);
+    return d
+  }
+
+  getLocalized(item, lang) {
+    if (typeof item === "string") return item;
+    return item[lang];
+  }
+
+  data() {
+    return {
+      permalink: data => `/${data.lang}/program.ics`
+    }
+  }
+
+  render({ ese, program, lang }) {
+    const url = `https://ese.ifsr.de/${ese.year}`;
+
+    const cal = new ICalCalendar({
+      name: `ESE ${ese.year}`,
+      url,
+      method: ICalCalendarMethod.PUBLISH,
+    });
+
+    for (const [date, events] of Object.entries(program)) {
+      for (const [i, event] of events.entries()) {
+        // nunjucks loops are 1-indexed by default
+        const id = `${date}_${i+1}`;
+
+        let description = this.getLocalized(event.description, lang);
+
+        if ("annotation" in event && event.annotation !== null) {
+          description += "\n\n";
+            + (lang == "en" ? "Notice: " : "Hinweis: ")
+            + this.getLocalized(event.annotation, lang);
+        }
+
+        if ("location" in event && event.location !== null) {
+          description += "\n\n"
+            + (lang == "en" ? "Location: " : "Veranstaltungsort: ")
+            + this.getLocalized(event.location, lang);
+        }
+
+        cal.createEvent({
+          id,
+          start: this.getDate(date, event.start),
+          end: ("end" in event && event.end !== null)
+            ? this.getDate(date, event.end)
+            : this.getDate(date, "23:59"),
+          summary: this.getLocalized(event.title, lang),
+          description,
+          url: `${url}/${lang}/program/#${id}`,
+        });
+      }
+    }
+
+    return cal.toString()
+  }
+}