fix: set avante-nvim to build from source

flake/legacyPackages.nix

@@ -28,6 +28,17 @@
                 sha256 = pin.hash;
               };
             };
+          avante-nvim = let
+            pin = self.pins.avante-nvim;
+          in
+            final.callPackage ./legacyPackages/avante-nvim.nix {
+              version = pin.branch;
+              src = prev.fetchFromGitHub {
+                inherit (pin.repository) owner repo;
+                rev = pin.revision;
+                sha256 = pin.hash;
+              };
+            };
         })
       ];
     };

flake/legacyPackages/avante-nvim.nix

@@ -0,0 +1,81 @@
+{
+  nix-update-script,
+  openssl,
+  pkg-config,
+  rustPlatform,
+  stdenv,
+  vimPlugins,
+  vimUtils,
+  makeWrapper,
+  pkgs,
+  version,
+  src,
+}: let
+  inherit version src;
+  avante-nvim-lib = rustPlatform.buildRustPackage {
+    pname = "avante-nvim-lib";
+    inherit version src;
+
+    useFetchCargoVendor = true;
+    cargoHash = "sha256-pmnMoNdaIR0i+4kwW3cf01vDQo39QakTCEG9AXA86ck=";
+
+    nativeBuildInputs = [
+      pkg-config
+      makeWrapper
+      pkgs.perl
+    ];
+
+    buildInputs = [
+      openssl
+    ];
+
+    buildFeatures = ["luajit"];
+
+    checkFlags = [
+      # Disabled because they access the network.
+      "--skip=test_hf"
+      "--skip=test_public_url"
+      "--skip=test_roundtrip"
+      "--skip=test_fetch_md"
+    ];
+  };
+in
+  vimUtils.buildVimPlugin {
+    pname = "avante-nvim";
+    inherit version src;
+
+    dependencies = with vimPlugins; [
+      dressing-nvim
+      img-clip-nvim
+      nui-nvim
+      nvim-treesitter
+      plenary-nvim
+    ];
+
+    postInstall = let
+      ext = stdenv.hostPlatform.extensions.sharedLibrary;
+    in ''
+      mkdir -p $out/build
+      ln -s ${avante-nvim-lib}/lib/libavante_repo_map${ext} $out/build/avante_repo_map${ext}
+      ln -s ${avante-nvim-lib}/lib/libavante_templates${ext} $out/build/avante_templates${ext}
+      ln -s ${avante-nvim-lib}/lib/libavante_tokenizers${ext} $out/build/avante_tokenizers${ext}
+      ln -s ${avante-nvim-lib}/lib/libavante_html2md${ext} $out/build/avante_html2md${ext}
+    '';
+
+    passthru = {
+      updateScript = nix-update-script {
+        attrPath = "vimPlugins.avante-nvim.avante-nvim-lib";
+      };
+
+      # needed for the update script
+      inherit avante-nvim-lib;
+    };
+
+    nvimSkipModules = [
+      # Requires setup with corresponding provider
+      "avante.providers.azure"
+      "avante.providers.copilot"
+      "avante.providers.vertex_claude"
+      "avante.providers.ollama"
+    ];
+  }