1 files changed, 15 insertions, 1 deletions
diff --git a/default.nix b/default.nix
index 8cd6397..b138123 100644
--- a/default.nix
+++ b/default.nix
@@ -2,6 +2,20 @@ let
   pkgs = import <nixpkgs> { };
   rootSrc = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
 in rec {
+  subtasks = rec {
+    uniqueFeeds = utils.baseTask.overrideAttrs (baseAttrs: {
+      name = "${baseAttrs.name}-unique-feeds";
+      buildPhase = ''
+        OUT="$(uniq -D <(sort ./newsboat/urls))"
+        [[ $OUT = "" ]] || {
+          echo "Duplicate subscriptions found in ./newsboat/urls:"
+          echo "$OUT"
+          exit 1
+        }
+        touch $out
+      '';
+    });
+  };
   utils = import ./nixos/utils.nix {
     pkgs = pkgs;
     rootSrc = rootSrc; # FIXME: remove the need for this
@@ -11,6 +25,6 @@ in rec {
     utils.formatNix
     (utils.shellcheck ".*(encrypted|os-installation.sh).*")
     (utils.fixme [ "default.nix" "utils.nix" ])
-    # subtasks.uniqueFeeds
+    subtasks.uniqueFeeds
   ];
 }