[#11930] Converting to Kotlin

Author: tfga

app/src/main/java/org/schabi/newpipe/local/playlist/ExportPlaylist.java

@@ -0,0 +1,72 @@
+package org.schabi.newpipe.local.playlist
+
+import android.content.Context
+import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
+import org.schabi.newpipe.R
+import org.schabi.newpipe.database.playlist.PlaylistStreamEntry
+import org.schabi.newpipe.local.playlist.PlayListShareMode.JUST_URLS
+import org.schabi.newpipe.local.playlist.PlayListShareMode.WITH_TITLES
+import org.schabi.newpipe.local.playlist.PlayListShareMode.YOUTUBE_TEMP_PLAYLIST
+import java.util.Objects.nonNull
+
+fun export(
+    shareMode: PlayListShareMode,
+    playlist: List<PlaylistStreamEntry>,
+    context: Context
+): String {
+    return when (shareMode) {
+        WITH_TITLES -> exportWithTitles(playlist, context)
+        JUST_URLS -> exportJustUrls(playlist)
+        YOUTUBE_TEMP_PLAYLIST -> exportAsYoutubeTempPlaylist(playlist)
+    }
+}
+
+fun exportWithTitles(
+    playlist: List<PlaylistStreamEntry>,
+    context: Context
+): String {
+
+    return playlist.asSequence()
+        .map { it.streamEntity }
+        .map { entity ->
+            context.getString(
+                R.string.video_details_list_item,
+                entity.title,
+                entity.url
+            )
+        }
+        .joinToString(separator = "\n")
+}
+
+fun exportJustUrls(playlist: List<PlaylistStreamEntry>): String {
+
+    return playlist.asSequence()
+        .map { it.streamEntity.url }
+        .joinToString(separator = "\n")
+}
+
+fun exportAsYoutubeTempPlaylist(playlist: List<PlaylistStreamEntry>): String {
+
+    val videoIDs = playlist.asReversed().asSequence()
+        .map { it.streamEntity }
+        .map { getYouTubeId(it.url) }
+        .filter(::nonNull)
+        .take(50)
+        .toList()
+        .asReversed()
+        .joinToString(separator = ",")
+
+    return "http://www.youtube.com/watch_videos?video_ids=$videoIDs"
+}
+
+/**
+ * Gets the video id from a YouTube URL.
+ *
+ * @param url YouTube URL
+ * @return the video id
+ */
+fun getYouTubeId(url: String): String? {
+    val httpUrl = url.toHttpUrlOrNull()
+
+    return httpUrl?.queryParameter("v")
+}

app/src/main/java/org/schabi/newpipe/local/playlist/ExportPlaylist.kt

@@ -2,7 +2,7 @@
 
 import static org.schabi.newpipe.error.ErrorUtil.showUiErrorSnackbar;
 import static org.schabi.newpipe.ktx.ViewUtils.animate;
-import static org.schabi.newpipe.local.playlist.ExportPlaylist.export;
+import static org.schabi.newpipe.local.playlist.ExportPlaylistKt.export;
 import static org.schabi.newpipe.local.playlist.PlayListShareMode.JUST_URLS;
 import static org.schabi.newpipe.local.playlist.PlayListShareMode.WITH_TITLES;
 import static org.schabi.newpipe.local.playlist.PlayListShareMode.YOUTUBE_TEMP_PLAYLIST;