[BACKEND] Support empty urls for multi_url, add overrides for extra urls in tv_show_by_date preset

src/ytdl_sub/downloaders/url/multi_url.py

@@ -1,3 +1,6 @@
+from typing import Dict
+from typing import List
+
 from ytdl_sub.downloaders.url.downloader import BaseUrlDownloader
 from ytdl_sub.downloaders.url.downloader import DownloaderValidator
 from ytdl_sub.downloaders.url.validators import MultiUrlValidator
@@ -43,6 +46,23 @@ class MultiUrlDownloadOptions(MultiUrlValidator, DownloaderValidator):
         """Returns itself!"""
         return self
 
+    def validate_with_variables(
+        self, source_variables: List[str], override_variables: Dict[str, str]
+    ) -> None:
+        """
+        Validates any source variables added by the collection
+        """
+        super().validate_with_variables(
+            source_variables=source_variables, override_variables=override_variables
+        )
+
+        has_non_empty_url = False
+        for url_validator in self.urls.list:
+            has_non_empty_url |= bool(url_validator.url.apply_formatter(override_variables))
+
+        if not has_non_empty_url:
+            raise self._validation_exception("Must contain at least one url that is non-empty")
+
 
 class MultiUrlDownloader(BaseUrlDownloader[MultiUrlDownloadOptions]):
     downloader_options_type = MultiUrlDownloadOptions

src/ytdl_sub/downloaders/url/validators.py

@@ -156,8 +156,8 @@ class UrlListValidator(ListValidator[UrlValidator]):
 
         added_variables: Dict[str, str] = self.list[0].variables.dict_with_format_strings
 
-        for idx, collection_url_validator in enumerate(self.list[1:]):
-            collection_variables = collection_url_validator.variables.dict_with_format_strings
+        for idx, url_validator in enumerate(self.list[1:]):
+            collection_variables = url_validator.variables.dict_with_format_strings
 
             # see if this collection contains new added vars (it should not)
             for var in collection_variables.keys():

tests/unit/config/test_preset.py

@@ -1,6 +1,9 @@
+import re
+
 import pytest
 
 from ytdl_sub.config.preset import Preset
+from ytdl_sub.downloaders.url.multi_url import MultiUrlDownloadOptions
 from ytdl_sub.plugins.nfo_tags import NfoTagsOptions
 from ytdl_sub.utils.exceptions import StringFormattingVariableNotFoundException
 from ytdl_sub.utils.exceptions import ValidationException
@@ -192,7 +195,7 @@ class TestPreset:
                 name="test",
                 value={
                     "download": youtube_video,
-                    "output_options": {"output_directory": "dir", "file_name": "file"},
+                    "output_options": output_options,
                     "output_directory_nfo_tags": {
                         "nfo_name": "the nfo name",
                         "nfo_root": "the root",
@@ -200,3 +203,39 @@ class TestPreset:
                     },
                 },
             )
+
+    def test_preset_with_multi_url__contains_empty_url(self, config_file, output_options):
+        _ = Preset(
+            config=config_file,
+            name="test",
+            value={
+                "download": {
+                    "download_strategy": "multi_url",
+                    "urls": [{"url": "non-empty url"}, {"url": ""}],  # empty url
+                },
+                "output_options": output_options,
+            },
+        )
+
+    def test_preset_with_multi_url__contains_all_empty_urls_errors(
+        self, config_file, output_options
+    ):
+        with pytest.raises(
+            ValidationException,
+            match=re.escape(
+                "Validation error in test.download: Must contain at least one "
+                "url that is non-empty"
+            ),
+        ):
+            _ = Preset(
+                config=config_file,
+                name="test",
+                value={
+                    "download": {
+                        "download_strategy": "multi_url",
+                        "urls": [{"url": "{url}"}, {"url": "{url2}"}],
+                    },
+                    "output_options": output_options,
+                    "overrides": {"url": "", "url2": ""},
+                },
+            )