nix: commit pin fallback

fallbacks to self revision if repo is dirty, or if hyprland is unpinned

flake.nix

@@ -40,7 +40,7 @@
         ]);
       rawCommitPins = (builtins.fromTOML (builtins.readFile ./hyprpm.toml)).repository.commit_pins;
       commitPins = builtins.listToAttrs (map (p: { name = builtins.head p; value = builtins.elemAt p 1;}) rawCommitPins);
-      selfRev = commitPins.${hyprland.rev};
+      selfRev = "${substring 0 7 commitPins.${hyprland.rev} or "git"}";
       version = "date=${mkDate (self.lastModifiedDate or "19700101")}_${self.shortRev or "dirty"}_${selfRev}";
     in
     {
@@ -54,10 +54,10 @@
           hyprscroller = pkgs.stdenv.mkDerivation {
             pname = "hyprscroller";
             inherit version;
-            src = builtins.fetchGit {
+            src = if (commitPins ? ${hyprland.rev}) && (self ? rev) then (builtins.fetchGit {
               url = "https://github.com/dawsers/hyprscroller";
               rev = selfRev;
-            };
+            }) else ./.;
 
             nativeBuildInputs = [
               pkgs.cmake