add ChapterRecognition from tachiyomi, closes #10

server/src/main/kotlin/eu/kanade/tachiyomi/source/local/LocalSource.kt

@@ -16,6 +16,7 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
+import eu.kanade.tachiyomi.util.chapter.ChapterRecognition
 import eu.kanade.tachiyomi.util.lang.compareToCaseInsensitiveNaturalOrder
 import eu.kanade.tachiyomi.util.storage.EpubFile
 import kotlinx.serialization.json.Json
@@ -248,7 +249,7 @@ class LocalSource : HttpSource() {
 
                     val chapNameCut = stripMangaTitle(name, manga.title)
                     if (chapNameCut.isNotEmpty()) name = chapNameCut
-//                    ChapterRecognition.parseChapterNumber(this, manga)
+                    ChapterRecognition.parseChapterNumber(this, manga)
                 }
             }
             .sortedWith { c1, c2 ->

server/src/main/kotlin/eu/kanade/tachiyomi/util/chapter/ChapterRecognition.kt

@@ -0,0 +1,152 @@
+package eu.kanade.tachiyomi.util.chapter
+
+import eu.kanade.tachiyomi.source.model.SChapter
+import eu.kanade.tachiyomi.source.model.SManga
+
+/**
+ * -R> = regex conversion.
+ */
+object ChapterRecognition {
+    /**
+     * All cases with Ch.xx
+     * Mokushiroku Alice Vol.1 Ch. 4: Misrepresentation -R> 4
+     */
+    private val basic = Regex("""(?<=ch\.) *([0-9]+)(\.[0-9]+)?(\.?[a-z]+)?""")
+
+    /**
+     * Regex used when only one number occurrence
+     * Example: Bleach 567: Down With Snowwhite -R> 567
+     */
+    private val occurrence = Regex("""([0-9]+)(\.[0-9]+)?(\.?[a-z]+)?""")
+
+    /**
+     * Regex used when manga title removed
+     * Example: Solanin 028 Vol. 2 -> 028 Vol.2 -> 028Vol.2 -R> 028
+     */
+    private val withoutManga = Regex("""^([0-9]+)(\.[0-9]+)?(\.?[a-z]+)?""")
+
+    /**
+     * Regex used to remove unwanted tags
+     * Example Prison School 12 v.1 vol004 version1243 volume64 -R> Prison School 12
+     */
+    private val unwanted = Regex("""(?<![a-z])(v|ver|vol|version|volume|season|s).?[0-9]+""")
+
+    /**
+     * Regex used to remove unwanted whitespace
+     * Example One Piece 12 special -R> One Piece 12special
+     */
+    private val unwantedWhiteSpace = Regex("""(\s)(extra|special|omake)""")
+
+    fun parseChapterNumber(chapter: SChapter, manga: SManga) {
+        // If chapter number is known return.
+        if (chapter.chapter_number == -2f || chapter.chapter_number > -1f) {
+            return
+        }
+
+        // Get chapter title with lower case
+        var name = chapter.name.lowercase()
+
+        // Remove comma's from chapter.
+        name = name.replace(',', '.')
+
+        // Remove unwanted white spaces.
+        unwantedWhiteSpace.findAll(name).let {
+            it.forEach { occurrence -> name = name.replace(occurrence.value, occurrence.value.trim()) }
+        }
+
+        // Remove unwanted tags.
+        unwanted.findAll(name).let {
+            it.forEach { occurrence -> name = name.replace(occurrence.value, "") }
+        }
+
+        // Check base case ch.xx
+        if (updateChapter(basic.find(name), chapter)) {
+            return
+        }
+
+        // Check one number occurrence.
+        val occurrences: MutableList<MatchResult> = arrayListOf()
+        occurrence.findAll(name).let {
+            it.forEach { occurrence -> occurrences.add(occurrence) }
+        }
+
+        if (occurrences.size == 1) {
+            if (updateChapter(occurrences[0], chapter)) {
+                return
+            }
+        }
+
+        // Remove manga title from chapter title.
+        val nameWithoutManga = name.replace(manga.title.lowercase(), "").trim()
+
+        // Check if first value is number after title remove.
+        if (updateChapter(withoutManga.find(nameWithoutManga), chapter)) {
+            return
+        }
+
+        // Take the first number encountered.
+        if (updateChapter(occurrence.find(nameWithoutManga), chapter)) {
+            return
+        }
+    }
+
+    /**
+     * Check if volume is found and update chapter
+     * @param match result of regex
+     * @param chapter chapter object
+     * @return true if volume is found
+     */
+    private fun updateChapter(match: MatchResult?, chapter: SChapter): Boolean {
+        match?.let {
+            val initial = it.groups[1]?.value?.toFloat()!!
+            val subChapterDecimal = it.groups[2]?.value
+            val subChapterAlpha = it.groups[3]?.value
+            val addition = checkForDecimal(subChapterDecimal, subChapterAlpha)
+            chapter.chapter_number = initial.plus(addition)
+            return true
+        }
+        return false
+    }
+
+    /**
+     * Check for decimal in received strings
+     * @param decimal decimal value of regex
+     * @param alpha alpha value of regex
+     * @return decimal/alpha float value
+     */
+    private fun checkForDecimal(decimal: String?, alpha: String?): Float {
+        if (!decimal.isNullOrEmpty()) {
+            return decimal.toFloat()
+        }
+
+        if (!alpha.isNullOrEmpty()) {
+            if (alpha.contains("extra")) {
+                return .99f
+            }
+
+            if (alpha.contains("omake")) {
+                return .98f
+            }
+
+            if (alpha.contains("special")) {
+                return .97f
+            }
+
+            return if (alpha[0] == '.') {
+                // Take value after (.)
+                parseAlphaPostFix(alpha[1])
+            } else {
+                parseAlphaPostFix(alpha[0])
+            }
+        }
+
+        return .0f
+    }
+
+    /**
+     * x.a -> x.1, x.b -> x.2, etc
+     */
+    private fun parseAlphaPostFix(alpha: Char): Float {
+        return ("0." + (alpha.code - 96).toString()).toFloat()
+    }
+}

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/Chapter.kt

@@ -9,6 +9,7 @@ package suwayomi.tachidesk.manga.impl
 
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
+import eu.kanade.tachiyomi.util.chapter.ChapterRecognition
 import org.jetbrains.exposed.dao.id.EntityID
 import org.jetbrains.exposed.sql.SortOrder.DESC
 import org.jetbrains.exposed.sql.and
@@ -52,12 +53,19 @@ object Chapter {
     private suspend fun getSourceChapters(mangaId: Int): List<ChapterDataClass> {
         val manga = getManga(mangaId)
         val source = getHttpSource(manga.sourceId.toLong())
-        val chapterList = source.fetchChapterList(
-            SManga.create().apply {
-                title = manga.title
-                url = manga.url
-            }
-        ).awaitSingle()
+
+        val sManga = SManga.create().apply {
+            title = manga.title
+            url = manga.url
+        }
+
+        val chapterList = source.fetchChapterList(sManga).awaitSingle()
+
+        // Recognize number for new chapters.
+        chapterList.forEach {
+            source.prepareNewChapter(it, sManga)
+            ChapterRecognition.parseChapterNumber(it, sManga)
+        }
 
         val chapterCount = chapterList.count()