Improve notification content by displaying date if useful

The date will now be included in the notification content if it makes sense to do so.
For the time range a en dash is now used instead of the minus symbol.

app/src/main/kotlin/com/simplemobiletools/calendar/extensions/Context.kt

@@ -37,6 +37,7 @@ import com.simplemobiletools.commons.helpers.isMarshmallowPlus
 import com.simplemobiletools.commons.helpers.isOreoPlus
 import org.joda.time.DateTime
 import org.joda.time.DateTimeZone
+import org.joda.time.LocalDate
 import java.io.File
 import java.text.SimpleDateFormat
 import java.util.*
@@ -157,9 +158,19 @@ fun Context.notifyEvent(event: Event) {
     val pendingIntent = getPendingIntent(applicationContext, event)
     val startTime = Formatter.getTimeFromTS(applicationContext, event.startTS)
     val endTime = Formatter.getTimeFromTS(applicationContext, event.endTS)
+    val startDate = Formatter.getDateFromTS(event.startTS)
+    val displayedStartDate: String
+    if (startDate == LocalDate.now()) {
+        displayedStartDate = ""
+    } else if (startDate == LocalDate.now().plusDays(1)) {
+        displayedStartDate = getString(R.string.tomorrow)
+    } else /* At least 2 days in the future */ {
+        displayedStartDate = Formatter.getDayAndMonth(startDate)
+    }
     val timeRange = if (event.getIsAllDay()) getString(R.string.all_day) else getFormattedEventTime(startTime, endTime)
     val descriptionOrLocation = if (config.replaceDescription) event.location else event.description
-    val notification = getNotification(applicationContext, pendingIntent, event, "$timeRange $descriptionOrLocation")
+    val content = arrayOf(displayedStartDate, timeRange, descriptionOrLocation).joinToString(" ")
+    val notification = getNotification(applicationContext, pendingIntent, event, content)
     val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
     notificationManager.notify(event.id, notification)
 }
@@ -210,7 +221,7 @@ private fun getNotification(context: Context, pendingIntent: PendingIntent, even
     return builder.build()
 }
 
-private fun getFormattedEventTime(startTime: String, endTime: String) = if (startTime == endTime) startTime else "$startTime - $endTime"
+private fun getFormattedEventTime(startTime: String, endTime: String) = if (startTime == endTime) startTime else "$startTime\u2013$endTime"
 
 private fun getPendingIntent(context: Context, event: Event): PendingIntent {
     val intent = Intent(context, EventActivity::class.java)

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Formatter.kt

@@ -7,7 +7,9 @@ import com.simplemobiletools.calendar.extensions.getNowSeconds
 import com.simplemobiletools.calendar.extensions.seconds
 import org.joda.time.DateTime
 import org.joda.time.DateTimeZone
+import org.joda.time.LocalDate
 import org.joda.time.format.DateTimeFormat
+import java.text.DateFormat
 
 object Formatter {
     val DAYCODE_PATTERN = "YYYYMMdd"
@@ -76,6 +78,8 @@ object Formatter {
 
     fun getDayCodeFromDateTime(dateTime: DateTime) = dateTime.toString(DAYCODE_PATTERN)
 
+    fun getDateFromTS(ts: Int) = LocalDate(ts * 1000L, DateTimeZone.getDefault())
+
     fun getDateTimeFromTS(ts: Int) = DateTime(ts * 1000L, DateTimeZone.getDefault())
 
     fun getUTCDateTimeFromTS(ts: Int) = DateTime(ts * 1000L, DateTimeZone.UTC)
@@ -104,4 +108,6 @@ object Formatter {
     }
 
     fun getShiftedImportTimestamp(ts: Int) = getUTCDateTimeFromTS(ts).withTime(13, 0, 0, 0).withZoneRetainFields(DateTimeZone.getDefault()).seconds()
+
+    fun getDayAndMonth(localDate: LocalDate) = localDate.toString("dd.MM.")
 }

app/src/main/res/values-de/strings.xml

@@ -89,6 +89,7 @@
 
     <!-- Event Reminders -->
     <string name="reminder">Erinnerung</string>
+    <string name="tomorrow">Morgen</string>
     <string name="before">vorher</string>
     <string name="add_another_reminder">Füge eine weitere Erinnerung hinzu</string>
     <string name="event_reminders">Ereignis Erinnerungen</string>

app/src/main/res/values/strings.xml

@@ -89,6 +89,7 @@
 
     <!-- Event Reminders -->
     <string name="reminder">Reminder</string>
+    <string name="tomorrow">Tomorrow</string>
     <string name="before">before</string>
     <string name="add_another_reminder">Add another reminder</string>
     <string name="event_reminders">Event reminders</string>