home: i3: setup bluetooth mouse battery block

.gitattributes

@@ -1,2 +1,3 @@
 secrets/*.secret filter=git-crypt diff=git-crypt
 secrets/wireguard.nix filter=git-crypt diff=git-crypt
+home/secrets/*.secret filter=git-crypt diff=git-crypt

home/default.nix

@@ -3,6 +3,7 @@
   imports = [
     ./emacs.nix
     ./flameshot.nix
+    ./secrets
     ./tmux.nix
     ./x
   ];

home/secrets/default.nix

@@ -0,0 +1,13 @@
+{ lib, ... }:
+with lib;
+{
+  options.my.secrets = mkOption {
+    type = types.attrs;
+  };
+
+  config.my.secrets = {
+    # I'm not sure hiding this is very important, but it *seems* like a bad idea
+    # to expose this
+    bluetooth-mouse-mac-address = fileContents ./bluetooth-mouse-mac-address.secret;
+  };
+}

home/x/i3bar.nix

@@ -60,6 +60,13 @@ in
               block = "networkmanager";
               primary_only = true;
             }
+            {
+              block = "bluetooth";
+              mac = config.my.secrets.bluetooth-mouse-mac-address;
+              hide_disconnected = true;
+              # TODO: use format when i3status-rust updates to v0.20
+              # format = "{percentage}";
+            }
             {
               block = "sound";
               driver = "pulseaudio";