Update Downloader.kt

added a function that creates a local source readable details.json file on chapter download.

app/src/main/java/eu/kanade/tachiyomi/data/download/Downloader.kt

@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.data.download
 
 import android.content.Context
+import android.net.Uri
 import com.hippo.unifile.UniFile
 import com.jakewharton.rxrelay.BehaviorRelay
 import com.jakewharton.rxrelay.PublishRelay
@@ -28,6 +29,9 @@ import eu.kanade.tachiyomi.util.storage.saveTo
 import eu.kanade.tachiyomi.util.system.ImageUtil
 import eu.kanade.tachiyomi.util.system.logcat
 import kotlinx.coroutines.async
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
 import logcat.LogPriority
 import okhttp3.Response
 import rx.Observable
@@ -37,6 +41,7 @@ import rx.subscriptions.CompositeSubscription
 import uy.kohesive.injekt.injectLazy
 import java.io.BufferedOutputStream
 import java.io.File
+import java.io.OutputStream
 import java.util.zip.CRC32
 import java.util.zip.ZipEntry
 import java.util.zip.ZipOutputStream
@@ -500,6 +505,55 @@ class Downloader(
         }
     }
 
+    /**
+     * Data type for details.json
+     */
+    @Serializable
+    data class Details(
+        val title: String?,
+        val author: String?,
+        val artist: String?,
+        val genre: List<String>? = emptyList(),
+        val description: String?,
+        val status: String?,
+    )
+
+    /**
+     * creates the details.json file containing manga information for local source
+     *
+     * @param mangaDir the manga directory of the download.
+     * @param manga the manga of the chapters to download.
+     */
+    private fun createDetails(mangaDir: UniFile, manga: Manga) {
+        try {
+            val detailsData = Details(
+                manga.title,
+                manga.author,
+                manga.artist,
+                manga.genre,
+                manga.description,
+                manga.status.toString(),
+            )
+
+            val fileName = "details.json"
+            var path = mangaDir.filePath
+            path = "$path/$fileName"
+            val file = File(path)
+            val uri = Uri.fromFile(file)
+
+            val json: Json by injectLazy()
+
+            val outputStream: OutputStream? = uri?.let {
+                context.contentResolver?.openOutputStream(
+                    it,
+                )
+            }
+            outputStream?.write(json.encodeToString(detailsData).toByteArray())
+        } catch (e: Exception) {
+            logcat(LogPriority.ERROR, e) { "Error creating details.json for ${manga.title}" }
+        }
+    }
+
     /**
      * Checks if the download was successful.
      *
@@ -528,6 +582,10 @@ class Downloader(
 
             DiskUtil.createNoMediaFile(tmpDir, context)
 
+            // creates details.json file for local source
+            if (preferences.createDetails().get()) {
+                createDetails(mangaDir, download.manga)
+            }
             Download.State.DOWNLOADED
         } else {
             Download.State.ERROR