chore: change to native nix scripts

modules/home/common/nix-index.nix

@@ -1,4 +1,4 @@
-{ self, lib, config, pkgs, ... }:
+{ lib, config, pkgs, ... }:
 {
   options.swarselmodules.nix-index = lib.mkEnableOption "nix-index settings";
   config = lib.mkIf config.swarselmodules.nix-index {
@@ -6,7 +6,43 @@
       let
         commandNotFound = pkgs.runCommandLocal "command-not-found.sh" { } ''
           mkdir -p $out/etc/profile.d
-          substitute ${self + /files/scripts/command-not-found.sh}        \
+          cat > $out/etc/profile.d/command-not-found.sh <<'EOF'
+          # Adapted from https://github.com/bennofs/nix-index/blob/master/command-not-found.sh
+          command_not_found_handle() {
+              if [ -n "''${MC_SID-}" ] || ! [ -t 1 ]; then
+                  >&2 echo "$1: command not found"
+                  return 127
+              fi
+
+              echo -n "searching nix-index..."
+              ATTRS=$(@nix-locate@ --minimal --no-group --type x --type s --whole-name --at-root "/bin/$1")
+
+              case $(echo -n "$ATTRS" | grep -c "^") in
+              0)
+                  >&2 echo -ne "$(@tput@ el1)\r"
+                  >&2 echo "$1: command not found"
+                  ;;
+              *)
+                  >&2 echo -ne "$(@tput@ el1)\r"
+                  >&2 echo "The program ‘$(@tput@ setaf 4)$1$(@tput@ sgr0)’ is currently not installed."
+                  >&2 echo "It is provided by the following derivation(s):"
+                  while read -r ATTR; do
+                      ATTR=''${ATTR%.out}
+                      >&2 echo "  $(@tput@ setaf 12)nixpkgs#$(@tput@ setaf 4)$ATTR$(@tput@ sgr0)"
+                  done <<< "$ATTRS"
+                  ;;
+              esac
+
+              return 127
+          }
+
+          command_not_found_handler() {
+              command_not_found_handle "$@"
+              return $?
+          }
+          EOF
+
+          substitute $out/etc/profile.d/command-not-found.sh        \
             $out/etc/profile.d/command-not-found.sh                 \
             --replace-fail @nix-locate@ ${pkgs.nix-index}/bin/nix-locate \
             --replace-fail @tput@ ${pkgs.ncurses}/bin/tput