Add subscription functionality to yt-dlp module

modules/yt-dlp.nix

@@ -23,6 +23,33 @@ in
       example = "/mnt/storage/videos";
       description = "Base directory for downloaded videos";
     };
+
+    subscriptions = {
+      enable = mkEnableOption "RSS subscription checking for automatic video downloads";
+
+      feeds = mkOption {
+        type = types.listOf types.str;
+        default = [];
+        example = [
+          "https://www.youtube.com/feeds/videos.xml?channel_id=UCRHXUZ0BxbkU2MYZgsuFgkQ"
+        ];
+        description = "List of YouTube RSS feed URLs to monitor for new videos";
+      };
+
+      interval = mkOption {
+        type = types.str;
+        default = "hourly";
+        example = "*-*-* *:30:00";
+        description = "Systemd timer schedule for checking subscriptions";
+      };
+
+      maxVideosPerFeed = mkOption {
+        type = types.int;
+        default = 5;
+        example = 10;
+        description = "Maximum number of videos to process per feed (newest first)";
+      };
+    };
   };
 
   config = mkIf cfg.enable {
@@ -30,6 +57,8 @@ in
     home.packages = with pkgs; [
       cfg.package
       ffmpeg
+    ] ++ lib.optionals cfg.subscriptions.enable [
+      libxml2  # For xmllint to parse RSS feeds
     ];
 
     # Cookie files - managed by Nix (read-only)
@@ -84,6 +113,9 @@ in
       
       # Help
       dl-help = "download-help";
+    } // lib.optionalAttrs cfg.subscriptions.enable {
+      # YouTube subscription management
+      dl-subs-yt = "check-youtube-subscriptions";
     };
 
     programs.zsh.initContent = ''
@@ -330,6 +362,52 @@ in
       
       # Alias for backward compatibility
       alias dlv-clear-archive='dl-clear-archive'
+      
+      # YouTube RSS subscription checker
+      check-youtube-subscriptions() {
+        ${lib.optionalString cfg.subscriptions.enable ''
+        local max_videos="${toString cfg.subscriptions.maxVideosPerFeed}"
+        local feeds=(${lib.concatMapStringsSep " " (feed: ''"${feed}"'') cfg.subscriptions.feeds})
+        
+        if [[ ''${#feeds[@]} -eq 0 ]]; then
+          echo "No RSS feeds configured"
+          return 0
+        fi
+        
+        echo "Checking ''${#feeds[@]} YouTube subscription feeds..."
+        echo "Processing up to $max_videos videos per feed"
+        echo ""
+        
+        for feed in "''${feeds[@]}"; do
+          echo "Processing feed: $feed"
+          
+          # Fetch and parse the RSS feed, extract video links
+          local links=$(${pkgs.curl}/bin/curl -s "$feed" | \
+            ${pkgs.libxml2}/bin/xmllint --xpath "//*[local-name()='entry']/*[local-name()='link'][@rel='alternate']/@href" - 2>/dev/null | \
+            sed 's/href="//g; s/"//g' | \
+            head -n "$max_videos")
+          
+          if [[ -z "$links" ]]; then
+            echo "  No videos found or feed unavailable"
+            continue
+          fi
+          
+          local count=0
+          while IFS= read -r link; do
+            if [[ -n "$link" ]]; then
+              ((count++))
+              echo "  [$count] Downloading: $link"
+              download-youtube "$link"
+            fi
+          done <<< "$links"
+          
+          echo "  Processed $count videos from this feed"
+          echo ""
+        done
+        
+        echo "✓ Subscription check completed"
+        ''}
+      }
     '';
   };
 }