Added option to change order chapter (newest or oldest)

Ref: #106

mangadex_downloader/chapter.py

@@ -157,7 +157,7 @@ def __init__(
             data = get_chapter(_id)["data"]
 
         self.id = data["id"]
-        self._attr = data["attributes"]
+        self.attr = data["attributes"]
 
         # Get scanlation groups and manga
         rels = data["relationships"]
@@ -191,7 +191,7 @@ def __init__(
         self.use_group_name = not config.no_group_name
         self.use_chapter_title = config.use_chapter_title
 
-        self._lang = Language(self._attr["translatedLanguage"])
+        self._lang = Language(self.attr["translatedLanguage"])
 
         self._parse_name()
 
@@ -203,7 +203,7 @@ def from_data(cls, data):
 
     @property
     def volume(self):
-        vol = self._attr["volume"]
+        vol = self.attr["volume"]
         if vol is not None:
             # As far as i know
             # Volume manga are integer numbers, not float
@@ -226,18 +226,18 @@ def __str__(self) -> str:
     @property
     def chapter(self):
         try:
-            return self._attr["chapter"].strip()
+            return self.attr["chapter"].strip()
         except AttributeError:
             # null value
             return None
 
     @property
     def title(self):
-        return self._attr["title"]
+        return self.attr["title"]
 
     @property
     def pages(self):
-        return self._attr["pages"]
+        return self.attr["pages"]
 
     @property
     def language(self):
@@ -336,6 +336,7 @@ def iter_chapters_feed(manga_id, lang=None):
             "offset": offset,
             "order[volume]": "asc",
             "order[chapter]": "asc",
+            "order[readableAt]": "desc" if config.order == "newest" else "asc",
             "includeEmptyPages": 0,
         }
 

mangadex_downloader/cli/args_parser.py

@@ -354,6 +354,14 @@ def get_args(argv):
         help="Merge all chapters that has no volume into 1 file for 'volume' format. ",
         default=config.create_no_volume,
     )
+    chap_group.add_argument(
+        "--order",
+        default=config.order,
+        choices=("newest", "oldest"),
+        help="Change chapter order, by default it set to 'newest'. "
+        "Which mean it always try to download the newest chapter. "
+        "Available options: newest, oldest",
+    )
 
     # Chapter page related
     chap_page_group = parser.add_argument_group("Chapter Page")

mangadex_downloader/config/config.py

@@ -38,8 +38,9 @@
     validate_stacked_progress_bar_order,
     validate_log_level,
     validate_progress_bar_layout,
-    convert_string_lowercase,
     validate_int,
+    validate_order,
+    convert_string_lowercase,
     ConfigTypeError,
 )
 from .. import format as fmt, json_op
@@ -114,6 +115,7 @@ class _Config:
         ),
         "no_metadata": (False, validate_bool),
         "page_size": (0, validate_int),
+        "order": ("newest", validate_order),
     }
     default_conf = {x: y for x, (y, _) in confs.items()}
 

mangadex_downloader/config/utils.py

@@ -36,6 +36,7 @@
 
 __all__ = (
     "validate_bool",
+    "validate_order",
     "validate_language",
     "validate_value_from_iterator",
     "validate_format",
@@ -320,3 +321,11 @@ def validate_stacked_progress_bar_order(val):
 
     progress_bar_manager.set_types_order(*values)
     return values
+
+
+def validate_order(val):
+    val = val.strip().lower()
+    if val not in ["newest", "oldest"]:
+        raise ConfigTypeError(f"'{val}' is not valid order")
+
+    return val