handle chapters with part numbers

app/src/main/java/eu/kanade/tachiyomi/util/ChapterRecognition.java

@@ -19,6 +19,8 @@ public class ChapterRecognition {
 
     private static final Pattern pUnwanted =
             Pattern.compile("(\\b|\\d)(v|ver|vol|version|volume)\\.?\\s*\\d+\\b");
+    private static final Pattern pPart =
+            Pattern.compile("(\\b|\\d)part\\s*\\d+.+");
 
     public static void parseChapterNumber(Chapter chapter, Manga manga) {
         if (chapter.chapter_number != -1)
@@ -96,8 +98,8 @@ public class ChapterRecognition {
 
         // try splitting the name in parts an pick the first valid one
         String[] nameParts = chapter.name.split("-");
+        Chapter dummyChapter = Chapter.create();
         if (nameParts.length > 1) {
-            Chapter dummyChapter = Chapter.create();
             for (String part : nameParts) {
                 dummyChapter.name = part;
                 parseChapterNumber(dummyChapter, manga);
@@ -107,6 +109,15 @@ public class ChapterRecognition {
                 }
             }
         }
+
+        // Strip anything after "part xxx" and try that
+        name = pPart.matcher(name).replaceAll("$1");
+        dummyChapter.name = name;
+        parseChapterNumber(dummyChapter, manga);
+        if (dummyChapter.chapter_number >= 0) {
+            chapter.chapter_number = dummyChapter.chapter_number;
+            return;
+        }
     }
 
     /**

app/src/test/java/eu/kanade/tachiyomi/ChapterRecognitionTest.java

@@ -165,4 +165,11 @@ public class ChapterRecognitionTest {
         ChapterRecognition.parseChapterNumber(c, randomManga);
         assertThat(c.chapter_number).isEqualTo(123f);
     }
+
+    @Test
+    public void testChapterWithChapterPrefixAfterPart() {
+        Chapter c = createChapter("Tokyo ESP 027: Part 002: Chapter 001");
+        ChapterRecognition.parseChapterNumber(c, randomManga);
+        assertThat(c.chapter_number).isEqualTo(027f);
+    }
 }