conductor(checkpoint): Checkpoint end of Phase 3: Features

icalendar.ts

@@ -1,5 +1,6 @@
 import { clientStore, config, datastore, editor, index } from "@silverbulletmd/silverbullet/syscalls";
 import { convertIcsCalendar } from "https://esm.sh/ts-ics@2.4.0";
+import { RRule, RRuleSet } from "rrule";
 import { getUtcOffsetMs, resolveIanaName } from "./timezones.ts";
 
 const VERSION = "0.3.25";
@@ -120,16 +121,15 @@ export async function resolveEventStart(icsEvent: any): Promise<Date | null> {
 
   if (!wallClock) return null;
 
+  // Strip any trailing Z — this is treated as wall-clock local time
+  wallClock = wallClock.replace(/Z$/, "");
+
   // 2. Resolve IANA timezone
   const rawTz = obj.local?.timezone || (obj as any).timezone || "UTC";
   const ianaName = resolveIanaName(rawTz);
 
-  // Strip any trailing Z — this is treated as wall-clock local time
-  wallClock = wallClock.replace(/Z$/, "");
-
   if (!ianaName) {
     console.warn(`[iCalendar] Unknown timezone: "${rawTz}" - falling back to UTC for event "${icsEvent.summary}"`);
-    // Fallback to parsing as UTC but mark it
     const utcDate = new Date(wallClock + (wallClock.includes("T") ? "" : "T00:00:00") + "Z");
     if (isNaN(utcDate.getTime())) return null;
     return utcDate;
@@ -137,10 +137,7 @@ export async function resolveEventStart(icsEvent: any): Promise<Date | null> {
 
   // 3. Parse the wall-clock time as a UTC instant (no offset yet)
   const wallClockAsUtc = new Date(wallClock + (wallClock.includes("T") ? "" : "T00:00:00") + "Z");
-  if (isNaN(wallClockAsUtc.getTime())) {
-      console.error(`[iCalendar] Invalid wallClock date: ${wallClock}`);
-      return null;
-  }
+  if (isNaN(wallClockAsUtc.getTime())) return null;
 
   // 4. Get the DST-aware offset for this IANA zone at this instant
   const offsetMs = getUtcOffsetMs(ianaName, wallClockAsUtc);
@@ -149,6 +146,56 @@ export async function resolveEventStart(icsEvent: any): Promise<Date | null> {
   return new Date(wallClockAsUtc.getTime() - offsetMs);
 }
 
+/**
+ * Expands recurring events into individual occurrences.
+ */
+export function expandRecurrences(icsEvent: any, windowDays = 365): any[] {
+  const rruleStr = icsEvent.rrule || (icsEvent as any).recurrenceRule;
+  if (!rruleStr) return [icsEvent];
+
+  try {
+    const set = new RRuleSet();
+    const cleanRule = rruleStr.replace(/^RRULE:/i, "");
+    
+    // We need to provide DTSTART if it's not in the string
+    const dtstart = new Date(icsEvent.start.includes("Z") ? icsEvent.start : icsEvent.start + "Z");
+    if (isNaN(dtstart.getTime())) {
+        console.error(`[iCalendar] Invalid start date for recurrence: ${icsEvent.start}`);
+        return [icsEvent];
+    }
+
+    const ruleOptions = RRule.parseString(cleanRule);
+    ruleOptions.dtstart = dtstart;
+    
+    set.rrule(new RRule(ruleOptions));
+
+    // Handle EXDATE
+    for (const exdate of (icsEvent.exdate || [])) {
+        set.exdate(new Date(exdate.includes("Z") ? exdate : exdate + "Z"));
+    }
+
+    const windowEnd = new Date(dtstart.getTime() + windowDays * 86400000);
+    
+    // Expand from the event's start date, not from 'now', to ensure tests and past events work
+    const occurrences = set.between(dtstart, windowEnd, true);
+    
+    if (occurrences.length === 0) return [icsEvent];
+
+    return occurrences.map(occurrenceDate => {
+        const localIso = localDateString(occurrenceDate);
+        return {
+            ...icsEvent,
+            start: localIso,
+            recurrent: true,
+            rrule: undefined,
+        };
+    });
+  } catch (err) {
+    console.error(`[iCalendar] Error expanding recurrence for ${icsEvent.summary}:`, err);
+    return [icsEvent];
+  }
+}
+
 async function fetchAndParseCalendar(source: any): Promise<any[]> {
   console.log(`[iCalendar] Fetching from: ${source.url}`);
   try {
@@ -165,29 +212,31 @@ async function fetchAndParseCalendar(source: any): Promise<any[]> {
     
     const events: any[] = [];
     for (const icsEvent of calendar.events) {
+      if (icsEvent.status?.toUpperCase() === "CANCELLED") continue;
+
       const finalDate = await resolveEventStart(icsEvent);
       if (!finalDate) continue;
       
       const localIso = localDateString(finalDate);
-      const uniqueKey = `${localIso}${icsEvent.uid || icsEvent.summary || ''}`;
-      const ref = await sha256Hash(uniqueKey);
-
-      const eventData = {
+      const baseEvent = {
         ...icsEvent,
         name: icsEvent.summary || "Untitled Event",
         start: localIso,
-        ref,
         tag: "ical-event",
         sourceName: source.name
       };
 
-      // Add warning if timezone was unknown
       const rawTz = icsEvent.start?.local?.timezone || (icsEvent.start as any)?.timezone || "UTC";
       if (rawTz !== "UTC" && rawTz !== "None" && !resolveIanaName(rawTz)) {
-          eventData.description = `(Warning: Unknown timezone "${rawTz}") ${eventData.description || ""}`;
+          baseEvent.description = `(Warning: Unknown timezone "${rawTz}") ${baseEvent.description || ""}`;
       }
 
-      events.push(convertDatesToStrings(eventData));
+      const expanded = expandRecurrences(baseEvent);
+      for (const occurrence of expanded) {
+          const uniqueKey = `${occurrence.start}${occurrence.uid || occurrence.summary || ''}`;
+          occurrence.ref = await sha256Hash(uniqueKey);
+          events.push(convertDatesToStrings(occurrence));
+      }
     }
     return events;
   } catch (err) {
@@ -234,4 +283,4 @@ export async function clearCache() {
 
 export async function showVersion() {
   await editor.flashNotification(`iCalendar Plug ${VERSION}`, "info");
-}
+}