sanitize filename on Windows

webtoon_downloader/core/exceptions.py

@@ -11,6 +11,7 @@ class DownloadError(Exception):
 
     url: str
     cause: Exception
+    base_message: str = "Failed to download from"
     message: str | None = field(default=None)
 
     def __str__(self) -> str:
@@ -20,27 +21,33 @@ def __str__(self) -> str:
         if self.cause:
             cause_msg = str(self.cause)
             if cause_msg:
-                return f"Failed to download from {self.url} => {cause_msg}"
+                return f"{self.base_message} {self.url} => {cause_msg}"
 
-            return f"Failed to download from {self.url} due to: {self.cause.__class__.__name__}"
+            return f"{self.base_message} {self.url} due to: {self.cause.__class__.__name__}"
 
-        return f"Failed to download from {self.url}"
+        return f"{self.base_message} {self.url}"
 
 
 @dataclass
 class WebtoonDownloadError(DownloadError):
     """Exception raised for Webtoon download errors"""
 
+    base_message: str = "Failed to download Webtoon"
+
 
 @dataclass
 class ImageDownloadError(DownloadError):
     """Exception raised for image download errors"""
 
+    base_message: str = "downloading image"
+
 
 @dataclass
 class ChapterDownloadError(DownloadError):
     """Exception raised for chapter download errors"""
 
+    base_message: str = "downloading chapter"
+
     chapter_info: ChapterInfo | None = None
 
 

webtoon_downloader/core/webtoon/namer.py

@@ -1,3 +1,5 @@
+import os
+import re
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Protocol, runtime_checkable
@@ -7,6 +9,18 @@
 from webtoon_downloader.core.webtoon.models import ChapterInfo, PageInfo
 
 
+def sanitize_filename(filename: str) -> str:
+    """
+    Sanitizes a filename by replacing all non-alphanumeric characters with underscores on Windows.
+    """
+    if os.name == "nt":
+        filename = re.sub(r"[^\w\.-]", "_", filename)
+        if filename[-1] == "_":
+            filename = filename[:-1]
+
+    return filename
+
+
 @runtime_checkable
 class FileNameGenerator(Protocol):
     """
@@ -47,7 +61,8 @@ def get_chapter_directory(self, chapter_info: ChapterInfo) -> Path:
         Returns the directory path for storing the given chapter's data.
         """
         if self.use_chapter_title_directories:
-            return Path(chapter_info.title)
+            return Path(sanitize_filename(chapter_info.title))
+
         return Path(f"{chapter_info.number:0{len(str(chapter_info.total_chapters))}d}")
 
     def get_page_filename(self, page_info: PageInfo) -> str:
@@ -77,7 +92,7 @@ class NonSeparateFileNameGenerator(FileNameGenerator):
     are stored in the same directory.
     """
 
-    def get_chapter_directory(self, chapter_info: ChapterInfo) -> Path:  # type ignore
+    def get_chapter_directory(self, _: ChapterInfo) -> Path:  # type ignore
         """
         Returns the root directory for storing pages when they are not separated by chapters.
         """