fix(intents): accept item-typed INSERT / INSERT_OR_EDIT for "Add to calendar" (#74)

Other apps' "Add to calendar" / "Save to calendar" actions commonly fire the
canonical insert intent — ACTION_INSERT with setType("vnd.android.cursor.item/
event") — the singular *item* MIME type (Android's own docs example; used by
e.g. DB Navigator). Calendula advertised INSERT only on the *dir* MIME type, so
it never matched: absent from the chooser, and a silent no-op when it was the
only calendar app installed.

Add the item-typed INSERT to the events filter, plus ACTION_INSERT_OR_EDIT (the
third "add to calendar" action AOSP and Google Calendar register). The runtime
parser already treats any ACTION_INSERT as create; teach insertFormOrNull /
editEventKeyOrNull about INSERT_OR_EDIT so an id-less one is a create and an
id-carrying one opens the edit form.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -32,6 +32,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   Now a bigger widget gets bigger, more readable type and roomier rows, while the
   default size looks exactly as before — no new setting; it follows the size you
   already chose ([#51]).
+- Calendula now appears under other apps' "Add to calendar" / "Save to calendar"
+  actions. Some apps (e.g. DB Navigator) fire the widely-used "insert event"
+  intent with the singular `vnd.android.cursor.item/event` type, which Calendula
+  didn't advertise — so it was left out of the chooser, and if it was your only
+  calendar app the save silently did nothing. It now accepts that form, plus the
+  `INSERT_OR_EDIT` action, and opens the new event prefilled for review ([#74]).
 
 ## [2.16.0] — 2026-07-17
 
@@ -1079,3 +1085,4 @@ automatically, with zero telemetry and no internet permission.
 [#53]: https://codeberg.org/jlmakiola/calendula/issues/53
 [#60]: https://codeberg.org/jlmakiola/calendula/issues/60
 [#65]: https://codeberg.org/jlmakiola/calendula/issues/65
+[#74]: https://codeberg.org/jlmakiola/calendula/issues/74

app/src/main/AndroidManifest.xml

@@ -123,11 +123,13 @@
 
             <!-- Let another app or widget (e.g. the Todo Agenda widget) launch us
                  to create a new event, the way the AOSP calendar accepts it:
-                 ACTION_INSERT on the events dir mime type, carrying the new
+                 ACTION_INSERT on the events *dir* mime type, carrying the new
                  event's fields as CalendarContract extras
                  (MainActivity.insertFormOrNull, issue #30). ACTION_EDIT on the
                  dir mime is AOSP's "edit a new event" — i.e. create — so it maps
-                 to the same prefilled create form. -->
+                 to the same prefilled create form. (The far more common *item*-
+                 typed INSERT — the form the Android docs' example and apps like
+                 DB Navigator use — is the item filter below, issue #74.) -->
             <intent-filter>
                 <action android:name="android.intent.action.INSERT" />
                 <action android:name="android.intent.action.EDIT" />
@@ -135,14 +137,31 @@
                 <data android:mimeType="vnd.android.cursor.dir/event" />
             </intent-filter>
 
-            <!-- Edit an existing event another app/assistant/widget points at:
-                 ACTION_EDIT on content://com.android.calendar/events/<id>, the way
-                 AOSP fires it. Opens the occurrence in the edit form (not the
-                 read-only detail — that's the VIEW filter above). Matched by the
-                 provider's item MIME type, like the VIEW filter. The occurrence's
-                 times ride as EXTRA_EVENT_BEGIN_TIME / EXTRA_EVENT_END_TIME when
-                 supplied (MainActivity.editEventKeyOrNull). -->
+            <!-- Create or edit an event another app/assistant/widget points at,
+                 addressed by the provider's *item* MIME type. Three actions share
+                 this filter, told apart at runtime by the intent's data:
+
+                 • ACTION_INSERT — create. This is the form the Android docs'
+                   "insert an event" example and many apps use
+                   (setType("vnd.android.cursor.item/event")), e.g. DB Navigator's
+                   "Save to calendar". The dir-typed filter above alone missed it,
+                   so Calendula never showed in the chooser — and, when it was the
+                   only calendar app, the intent resolved to nothing (issue #74).
+                 • ACTION_INSERT_OR_EDIT — the third "add to calendar" action AOSP
+                   and Google Calendar register; a create, or an edit when it
+                   carries an event id.
+                 • ACTION_EDIT — edit the existing event at
+                   content://com.android.calendar/events/<id> (an id-less EDIT is a
+                   create). Opens the occurrence in the edit form, not the
+                   read-only detail — that's the VIEW filter above.
+
+                 Create fields ride as CalendarContract extras; an edit's
+                 occurrence times ride as EXTRA_EVENT_BEGIN_TIME /
+                 EXTRA_EVENT_END_TIME when supplied (MainActivity.insertFormOrNull
+                 / editEventKeyOrNull). -->
             <intent-filter>
+                <action android:name="android.intent.action.INSERT" />
+                <action android:name="android.intent.action.INSERT_OR_EDIT" />
                 <action android:name="android.intent.action.EDIT" />
                 <category android:name="android.intent.category.DEFAULT" />
                 <data android:mimeType="vnd.android.cursor.item/event" />

app/src/main/java/de/jeanlucmakiola/calendula/MainActivity.kt

@@ -222,10 +222,12 @@ class MainActivity : AppCompatActivity() {
      * [buildInsertEventForm].
      */
     private fun Intent.insertFormOrNull(): EventForm? {
-        // ACTION_EDIT on an existing event routes to the edit form instead
-        // ([editEventKeyOrNull]); only an id-less EDIT is a create.
+        // ACTION_EDIT / ACTION_INSERT_OR_EDIT on an existing event route to the
+        // edit form instead ([editEventKeyOrNull]); an id-less one is a create,
+        // as is any plain ACTION_INSERT.
         val isCreate = action == Intent.ACTION_INSERT ||
-            (action == Intent.ACTION_EDIT && editEventKeyOrNull() == null)
+            ((action == Intent.ACTION_EDIT || action == Intent.ACTION_INSERT_OR_EDIT) &&
+                editEventKeyOrNull() == null)
         if (!isCreate) return null
         return buildInsertEventForm(
             beginMillis = longExtraOrNull(CalendarContract.EXTRA_EVENT_BEGIN_TIME),
@@ -344,10 +346,11 @@ class MainActivity : AppCompatActivity() {
      * occurrence's times as `EXTRA_EVENT_BEGIN_TIME` / `EXTRA_EVENT_END_TIME`
      * when it has them, otherwise we carry [NO_OCCURRENCE_TIME] and
      * [EventEditViewModel.openForEdit] falls back to the event row's own
-     * DTSTART/DTEND. An id-less `ACTION_EDIT` is a create instead ([insertFormOrNull]).
+     * DTSTART/DTEND. An id-less `ACTION_EDIT` — or `ACTION_INSERT_OR_EDIT`, which
+     * some apps fire — is a create instead ([insertFormOrNull]).
      */
     private fun Intent.editEventKeyOrNull(): LongArray? {
-        if (action != Intent.ACTION_EDIT) return null
+        if (action != Intent.ACTION_EDIT && action != Intent.ACTION_INSERT_OR_EDIT) return null
         val uri = data ?: return null
         if (uri.host != CALENDAR_PROVIDER_HOST) return null
         val segments = uri.pathSegments