From c0f9cbcf93ca22e4f0ca66843be61a4bdf6f0a44 Mon Sep 17 00:00:00 2001
From: KFearsoff <kfearsoff@gmail.com>
Date: Fri, 6 May 2022 17:20:16 +0500
Subject: [PATCH] newsboat: allow imperative "urls" management

This commit allows imperative management of "urls" file. It can be
useful if "urls" file is treated as a secret.

With this change, it's possible to provision "urls" via Syncthing,
agenix, sops-nix or other means, while still managing Newsboat
declaratively.
---
 modules/programs/newsboat.nix | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/modules/programs/newsboat.nix b/modules/programs/newsboat.nix
index ba074a421..d2782bf2d 100644
--- a/modules/programs/newsboat.nix
+++ b/modules/programs/newsboat.nix
@@ -68,7 +68,10 @@ in {
           url = "http://example.com";
           tags = [ "foo" "bar" ];
         }];
-        description = "List of news feeds.";
+        description = ''
+          List of news feeds. Leave it empty if you want to manage feeds
+          imperatively, for example, using Syncthing.
+        '';
       };
 
       maxItems = mkOption {
@@ -121,16 +124,24 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [{
+      assertion = cfg.queries != { } -> cfg.urls != [ ];
+      message = ''
+        Cannot specify queries if urls is empty. Unset queries if you
+        want to manage urls imperatively.
+      '';
+    }];
+
     home.packages = [ pkgs.newsboat ];
 
     # Use ~/.newsboat on stateVersion < 21.05 and use ~/.config/newsboat for
     # stateVersion >= 21.05.
     home.file = mkIf (versionOlder config.home.stateVersion "21.05") {
-      ".newsboat/urls".text = urlsFileContents;
+      ".newsboat/urls" = mkIf (cfg.urls != [ ]) { text = urlsFileContents; };
       ".newsboat/config".text = configFileContents;
     };
     xdg.configFile = mkIf (versionAtLeast config.home.stateVersion "21.05") {
-      "newsboat/urls".text = urlsFileContents;
+      "newsboat/urls" = mkIf (cfg.urls != [ ]) { text = urlsFileContents; };
       "newsboat/config".text = configFileContents;
     };
   };