Fix chapter recognition regex and detail number (#1213)

* Update basic filter for sources that include space between numbers

Wasnts matching on  vol. 1 ch. 10 previously so mangadex last chapter was showing volume number.

* Don't show last chapter number when there are 0 chapters or chapters with no numbers.

This prevents one shots from showing with -1 as last chapter and instead just leaves it blank

* added else to be Unknown instead of blank

* removed empty line
added test case

* switched to null safe ?.

* Revert "switched to null safe ?."

This reverts commit 97a9300d1bedc8e01efb439c180eced8eaa1da5b.
undo

* switched to null safe ?.

app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt

@@ -7,7 +7,6 @@ import android.content.ClipboardManager
 import android.content.Context
 import android.content.Intent
 import android.graphics.Bitmap
-import android.graphics.Color
 import android.graphics.drawable.Drawable
 import android.net.Uri
 import android.os.Build
@@ -249,7 +248,11 @@ class MangaInfoController : NucleusController<MangaInfoPresenter>(),
      * @param count number of chapters.
      */
     fun setChapterCount(count: Float) {
+        if (count > 0f) {
             manga_chapters?.text = DecimalFormat("#.#").format(count)
+        } else {
+            manga_chapters?.text = resources?.getString(R.string.unknown)
+        }
     }
 
     fun setLastUpdateDate(date: Date) {

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

@@ -11,7 +11,7 @@ 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]+)?""")
+    private val basic = Regex("""(?<=ch\.) *([0-9]+)(\.[0-9]+)?(\.?[a-z]+)?""")
 
     /**
      * Regex used when only one number occurrence

app/src/test/java/eu/kanade/tachiyomi/data/database/ChapterRecognitionTest.kt

@@ -58,6 +58,17 @@ class ChapterRecognitionTest {
         assertThat(chapter.chapter_number).isEqualTo(4f)
     }
 
+    /**
+     * Ch. xx base case but space after period
+     */
+    @Test fun ChCaseBase2() {
+        createManga("Mokushiroku Alice")
+
+        createChapter("Mokushiroku Alice Vol. 1 Ch. 4: Misrepresentation")
+        ChapterRecognition.parseChapterNumber(chapter, manga)
+        assertThat(chapter.chapter_number).isEqualTo(4f)
+    }
+
     /**
      * Ch.xx.x base case
      */