[O] Format exposure

android/app/src/main/java/aza/instant/ExifUtils.kt

@@ -13,6 +13,13 @@ import java.util.Base64
 import java.util.Locale
 import kotlin.math.roundToInt
 
+fun formatExposureTime(t: Double): String {
+    return if (t <= 0) t.toString()
+    else if (t < 1.0) "1/${(1.0 / t).roundToInt()}s"
+    else if (t < 10) "%.1fs".format(t)
+    else "%.0fs".format(t)
+}
+
 data class ExifResult(val shutterInfo: String, val cameraInfo: String, val dateTime: String, val location: String, val urlName: String, val w: Int, val h: Int) {
     override fun toString(): String {
         return "Date/Time: $dateTime\nLocation: $location\nCamera Info: $cameraInfo\nShutter Info: $shutterInfo\nURL Name: $urlName"
@@ -24,7 +31,7 @@ suspend fun parseExif(data: ByteArray): ExifResult? {
     val d = exif.convertToPhotoMetadata()
 
     return ExifResult(
-        shutterInfo = "${d.focalLength?.roundToInt()}mm  f/${d.fNumber}  ${d.exposureTime}s  ISO-${d.iso}",
+        shutterInfo = "${d.focalLength?.roundToInt()}mm  f/${d.fNumber}  ${formatExposureTime(d.exposureTime)}s  ISO-${d.iso}",
         // TODO: Un-hardcode this in the future
         cameraInfo = if (d.cameraModel == "ILCE-6700") "Sony ILCE-6700 + Tamron 18-300 F3.5-6.3" else listOfNotNull(
             listOfNotNull(d.cameraMake?.lowercase()?.replaceFirstChar { it.titlecase() }, d.cameraModel).ifEmpty { null }?.joinToString(" "),