[Chan] Add related manga implementation

src/main/kotlin/org/koitharu/kotatsu/parsers/site/multichan/ChanParser.kt

@@ -20,6 +20,8 @@ internal abstract class ChanParser(
 		SortOrder.ALPHABETICAL,
 	)
 
+	protected open val isNsfwSource = false
+
 	override val authUrl: String
 		get() = "https://${domain}"
 
@@ -79,7 +81,7 @@ internal abstract class ChanParser(
 				}.getOrNull().orEmpty(),
 				rating = RATING_UNKNOWN,
 				state = null,
-				isNsfw = false,
+				isNsfw = isNsfwSource,
 				source = source,
 			)
 		}
@@ -87,7 +89,7 @@ internal abstract class ChanParser(
 
 	override suspend fun getDetails(manga: Manga): Manga {
 		val doc = webClient.httpGet(manga.url.toAbsoluteUrl(domain)).parseHtml()
-		val root = doc.body().getElementById("dle-content") ?: doc.parseFailed("Cannot find root")
+		val root = doc.body().requireElementById("dle-content")
 		val dateFormat = SimpleDateFormat("yyyy-MM-dd", Locale.US)
 		return manga.copy(
 			description = root.getElementById("description")?.html()?.substringBeforeLast("<div"),
@@ -162,6 +164,33 @@ internal abstract class ChanParser(
 		return a.attr("href").removeSuffix('/').substringAfterLast('/')
 	}
 
+	override suspend fun getRelatedManga(seed: Manga): List<Manga> {
+		val doc = webClient.httpGet(seed.url.replace("/manga/", "/related/").toAbsoluteUrl(domain)).parseHtml()
+		val root = doc.body().requireElementById("right")
+		return root.select("div.related").mapNotNull { div ->
+			val info = div.selectFirst(".related_info") ?: return@mapNotNull null
+			val a = info.selectFirst("a") ?: return@mapNotNull null
+			val href = a.attrAsRelativeUrl("href")
+			Manga(
+				id = generateUid(href),
+				url = href,
+				publicUrl = href.toAbsoluteUrl(a.host ?: domain),
+				altTitle = a.attr("title"),
+				title = a.text().substringAfterLast('(').substringBeforeLast(')'),
+				author = info.getElementsByAttributeValueStarting(
+					"href",
+					"/mangaka",
+				).firstOrNull()?.text(),
+				coverUrl = div.selectFirst("img")?.absUrl("src").orEmpty(),
+				tags = emptySet(),
+				rating = RATING_UNKNOWN,
+				state = null,
+				isNsfw = isNsfwSource,
+				source = source,
+			)
+		}
+	}
+
 	private fun getSortKey(sortOrder: SortOrder) =
 		when (sortOrder) {
 			SortOrder.ALPHABETICAL -> "catalog"

src/main/kotlin/org/koitharu/kotatsu/parsers/site/multichan/HenChanParser.kt

@@ -3,7 +3,10 @@ package org.koitharu.kotatsu.parsers.site.multichan
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
-import org.koitharu.kotatsu.parsers.model.*
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.model.MangaChapter
+import org.koitharu.kotatsu.parsers.model.MangaSource
+import org.koitharu.kotatsu.parsers.model.MangaTag
 import org.koitharu.kotatsu.parsers.util.*
 
 @MangaSourceParser("HENCHAN", "Хентай-тян", "ru")
@@ -17,19 +20,7 @@ internal class HenChanParser(context: MangaLoaderContext) : ChanParser(context,
 		"hentaichan.pro",
 	)
 
-	override suspend fun getList(
-		offset: Int,
-		query: String?,
-		tags: Set<MangaTag>?,
-		sortOrder: SortOrder,
-	): List<Manga> {
-		return super.getList(offset, query, tags, sortOrder).map {
-			it.copy(
-				coverUrl = it.coverUrl.replace("_blur", ""),
-				isNsfw = true,
-			)
-		}
-	}
+	override val isNsfwSource = true
 
 	override suspend fun getDetails(manga: Manga): Manga {
 		val doc = webClient.httpGet(manga.url.toAbsoluteUrl(domain)).parseHtml()

src/test/kotlin/org/koitharu/kotatsu/parsers/MangaParserTest.kt

@@ -3,7 +3,6 @@ package org.koitharu.kotatsu.parsers
 import kotlinx.coroutines.test.runTest
 import okhttp3.HttpUrl
 import org.junit.jupiter.api.Disabled
-import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.extension.ExtendWith
 import org.junit.jupiter.params.ParameterizedTest
 import org.koitharu.kotatsu.parsers.model.Manga
@@ -23,14 +22,6 @@ internal class MangaParserTest {
 
 	private val context = MangaLoaderContextMock
 
-	@Test
-	fun related() = runTest {
-		val parser = context.newParserInstance(MangaSource.READMANGA_RU)
-		val seed = parser.getList(0, "emanon").first()
-		val related = parser.getRelatedManga(seed)
-		assert(related.isNotEmpty() && seed !in related)
-	}
-
 	@ParameterizedTest(name = "{index}|list|{0}")
 	@MangaSources
 	fun list(source: MangaSource) = runTest {