keynav: add module

PR #1082

modules/misc/news.nix

@@ -1407,6 +1407,14 @@ in
           [1] https://blog.mozilla.org/addons/2019/10/31/firefox-to-discontinue-sideloaded-extensions/
         '';
       }
+
+      {
+        time = "2020-03-17T21:56:26+00:00";
+        condition = hostPlatform.isLinux;
+        message = ''
+          A new module is available: 'services.keynav'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -128,6 +128,7 @@ let
     (loadModule ./services/kdeconnect.nix { })
     (loadModule ./services/keepassx.nix { })
     (loadModule ./services/keybase.nix { })
+    (loadModule ./services/keynav.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/lieer.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/lorri.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/mbsync.nix { })

modules/services/keynav.nix

@@ -0,0 +1,29 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.keynav;
+
+in {
+  options.services.keynav = { enable = mkEnableOption "keynav"; };
+
+  config = mkIf cfg.enable {
+    systemd.user.services.keynav = {
+      Unit = {
+        Description = "keynav";
+        After = [ "graphical-session-pre.target" ];
+        PartOf = [ "graphical-session.target" ];
+      };
+
+      Service = {
+        ExecStart = "${cfg.package}/bin/keynav";
+        RestartSec = 3;
+        Restart = "always";
+      };
+
+      Install = { WantedBy = [ "graphical-session.target" ]; };
+    };
+  };
+}