Integrate tag searching into library.

app/src/main/java/eu/kanade/tachiyomi/data/source/online/all/EHentaiMetadata.kt

@@ -125,7 +125,7 @@ class EHentaiMetadata(override val id: Int,
 
     override fun fetchMangaDetails(manga: Manga) = Observable.fromCallable {
         //Hack to convert the gallery into an online gallery when favoriting it or reading it
-        metadataHelper.fetchMetadata(manga.url, exh).copyTo(manga)
+        metadataHelper.fetchMetadata(manga.url, exh)?.copyTo(manga)
         manga
     }!!
 

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryAdapter.kt

@@ -7,9 +7,15 @@ import android.widget.FrameLayout
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.source.SourceManager
+import eu.kanade.tachiyomi.data.source.online.all.EHentai
+import eu.kanade.tachiyomi.data.source.online.all.EHentaiMetadata
 import eu.kanade.tachiyomi.util.inflate
 import eu.kanade.tachiyomi.widget.AutofitRecyclerView
+import exh.metadata.MetadataHelper
+import exh.search.SearchEngine
 import kotlinx.android.synthetic.main.item_catalogue_grid.view.*
+import uy.kohesive.injekt.injectLazy
 import java.util.*
 
 /**
@@ -25,6 +31,11 @@ class LibraryCategoryAdapter(val fragment: LibraryCategoryView) :
      */
     private var mangas: List<Manga> = emptyList()
 
+    private val sourceManager: SourceManager by injectLazy()
+
+    private val searchEngine = SearchEngine()
+    private val metadataHelper = MetadataHelper()
+
     init {
         setHasStableIds(true)
     }
@@ -70,8 +81,28 @@ class LibraryCategoryAdapter(val fragment: LibraryCategoryView) :
      * @return true if the manga should be included, false otherwise.
      */
     override fun filterObject(manga: Manga, query: String): Boolean = with(manga) {
-        title.toLowerCase().contains(query) ||
+        if(manga.source > 100) {
-                author != null && author!!.toLowerCase().contains(query)
+            //Regular searching for normal manga
+            title.toLowerCase().contains(query) ||
+                    author != null && author!!.toLowerCase().contains(query)
+        } else {
+            //Use gallery search engine for EH manga
+            val source = sourceManager.get(manga.source)
+            source?.let {
+                val exh: Boolean
+                if(source is EHentai)
+                    exh = source.exh
+                else if(source is EHentaiMetadata)
+                    exh = source.exh
+                else
+                    return@with false
+
+                val metadata = metadataHelper.fetchMetadata(manga.url, exh)
+                metadata?.let {
+                    searchEngine.matches(metadata, searchEngine.parseQuery(query))
+                } ?: title.toLowerCase().contains(query) //Use regular searching when the metadata is not set up for this gallery
+            } ?: false
+        }
     }
 
     /**

app/src/main/java/exh/metadata/MetadataHelper.kt

@@ -8,7 +8,8 @@ class MetadataHelper {
     fun writeGallery(galleryMetadata: ExGalleryMetadata)
             = exGalleryBook().write(galleryMetadata.galleryUniqueIdentifier(), galleryMetadata)
 
-    fun fetchMetadata(url: String, exh: Boolean) = ExGalleryMetadata().apply {
+    fun fetchMetadata(url: String, exh: Boolean): ExGalleryMetadata?
+            = ExGalleryMetadata().apply {
         this.url = url
         this.exh = exh
         return exGalleryBook().read<ExGalleryMetadata>(galleryUniqueIdentifier())

app/src/main/java/exh/search/SearchEngine.kt

@@ -4,6 +4,9 @@ import exh.metadata.models.ExGalleryMetadata
 import exh.metadata.models.Tag
 
 class SearchEngine {
+
+    private val queryCache = mutableMapOf<String, List<QueryComponent>>()
+
     fun matches(metadata: ExGalleryMetadata, query: List<QueryComponent>): Boolean {
 
         fun matchTagList(tags: List<Tag>,
@@ -56,7 +59,7 @@ class SearchEngine {
         return true
     }
 
-    fun parseQuery(query: String): List<QueryComponent> {
+    fun parseQuery(query: String) = queryCache.getOrPut(query, {
         val res = mutableListOf<QueryComponent>()
 
         var inQuotes = false
@@ -128,6 +131,6 @@ class SearchEngine {
         }
         flushAll()
 
-        return res
+        res
-    }
+    })
 }