niv: pin nil to repo unstable version

nix/configurations/vanadium.nix

@@ -42,6 +42,7 @@ in
             ../overlays/wired-notify.nix
             ../overlays/nix-tree.nix
             ../overlays/wallpapers.nix
+            ../overlays/nil.nix
 
             ../overlays/iosevka.nix
             ../packages/overlay.nix

nix/overlays/nil.nix

@@ -0,0 +1,8 @@
+# Run the one with my cool feature here for now
+let
+  sources = import ../sources.nix;
+  inherit (sources) nil;
+in
+  final: _: {
+    nil = (builtins.getFlake "github:${nil.owner}/${nil.repo}/${nil.rev}").packages.${final.system}.default;
+  }

nix/sources.json

@@ -67,6 +67,18 @@
         "rev": "cd2a9c028df820a83ca2807dc6c6e7abc3dfa7fc",
         "type": "git"
     },
+    "nil": {
+        "branch": "main",
+        "description": "NIx Language server, an incremental analysis assistant for writing in Nix.",
+        "homepage": "",
+        "owner": "oxalica",
+        "repo": "nil",
+        "rev": "870a4b1b5f12004832206703ac15aa85c42c247b",
+        "sha256": "1xlbzv9495g2gx6nmnw79v5g9ajwzkl1qwlpkqwqzqz4380qnnxy",
+        "type": "tarball",
+        "url": "https://github.com/oxalica/nil/archive/870a4b1b5f12004832206703ac15aa85c42c247b.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "nix-tree": {
         "branch": "main",
         "description": "Interactively browse dependency graphs of Nix derivations.",