refactor: use terminal package attr paths with shared resolver

modules/features/niri/default.nix

@@ -1,4 +1,11 @@
-{ inputs, ... }:
+{
+  inputs,
+  config,
+  ...
+}:
+let
+  metaLib = config.meta.lib;
+in
 {
   flake.modules.nixos.niri =
     { pkgs, ... }:
@@ -43,13 +50,10 @@
           inherit (display) mode;
         }
       ) config.meta.host.displays;
-      rawTerminalAttrPath = lib.splitString "." config.meta.user.terminalPackageAttr;
-      terminalAttrPath =
-        if rawTerminalAttrPath != [ ] && builtins.head rawTerminalAttrPath == "pkgs" then
-          builtins.tail rawTerminalAttrPath
-        else
-          rawTerminalAttrPath;
-      terminalPackage = lib.attrByPath terminalAttrPath null pkgs;
+      terminalPackage = metaLib.resolvePackagePath {
+        inherit pkgs;
+        path = config.meta.user.terminalPackagePath;
+      };
       hasMainProgram = terminalPackage != null && terminalPackage ? meta.mainProgram;
 
       mouseSettings = lib.filterAttrs (_: value: value != null) {
@@ -77,11 +81,11 @@
       assertions = [
         {
           assertion = terminalPackage != null;
-          message = "Unknown terminal package `${config.meta.user.terminalPackageAttr}` for user `${config.meta.user.name}`.";
+          message = "Unknown terminal package `${lib.showAttrPath config.meta.user.terminalPackagePath}` for user `${config.meta.user.name}`.";
         }
         {
           assertion = hasMainProgram;
-          message = "Terminal package `${config.meta.user.terminalPackageAttr}` must define `meta.mainProgram`.";
+          message = "Terminal package `${lib.showAttrPath config.meta.user.terminalPackagePath}` must define `meta.mainProgram`.";
         }
       ];