feat: add flake-friendly nix-index overlay

See: https://github.com/nix-community/nix-index/pull/227

modules/terminal-life/bash/default.nix

@@ -24,7 +24,7 @@ in {
     PROMPT_COMMAND='echo -e -n "\e]2;$(basename "$PWD" | sed "s/${psCfg.user.name}/~/")\e\\"'
 
     # If a command is not found, show me where it is
-    source ${pkgs.nix-index}/etc/profile.d/command-not-found.sh
+    source ${pkgs.nix-index}/etc/profile.d/command-not-found.bash
 
     # Helps you navigate directories faster
     # https://github.com/gsamokovarov/jump

modules/terminal-life/default.nix

@@ -21,6 +21,10 @@ in {
 
   config = {
     programs.command-not-found.enable = false;
+    programs.nix-index.enable = true;
+    # We do this manually in modules/terminal-life/bash/default.nix
+    # until https://github.com/nix-community/nix-index/pull/227 is merged
+    programs.nix-index.enableBashIntegration = false;
 
     users.users."${psCfg.user.name}".packages = with pkgs; [
       ack

overlays/default.nix

@@ -27,6 +27,7 @@
           (import ../pkgs)
           (import ./blesh.nix)
           (import ./mdbook-multilang.nix inputs)
+          (import ./nix-index.nix)
           (import ./prr.nix)
           (import ./neovim-plugins.nix)
           (import ./element-desktop.nix)

overlays/nix-index.nix

@@ -0,0 +1,24 @@
+final: prev: {
+  nix-index-unwrapped = prev.nix-index-unwrapped.overrideAttrs (oldAttrs: rec {
+    inherit (oldAttrs) pname;
+    src = prev.fetchFromGitHub {
+      owner = "teutat3s";
+      repo = "nix-index";
+      rev = "e2d1917f474083f6d5a2c3368a6073f6427c19e4";
+      hash = "sha256-3nTphxyqI6Hci7yJ2bKLcgdRl2qOY3BzUqoIl1YmmsA=";
+    };
+    version = "unstable-2023-11-25";
+
+    cargoDeps = oldAttrs.cargoDeps.overrideAttrs (prev.lib.const {
+      name = "${pname}-vendor.tar.gz";
+      inherit src;
+      outputHash = "sha256-x4oejbS1/L3WkN2S6PzvJni9UasRTP3TVVp3Ur9ge8U=";
+    });
+
+    postInstall = ''
+      substituteInPlace etc/command-not-found.* \
+        --subst-var out
+      install -Dm444 etc/command-not-found.* -t $out/etc/profile.d
+    '';
+  });
+}