feat: adds back overlays and adds nix-search-fzf stolen from this file: https://github.com/IvarWithoutBones/dotfiles/blob/main/home-manager/modules/zsh.nix#L65

overlays/default.nix

@@ -1,3 +1,3 @@
 {
-  addition = final: _: import ../pkgs { pkgs = final; };
+  addition = final: _: import ../pkgs/default.nix { pkgs = final; };
 }

pkgs/nix-search-fzf/default.nix

@@ -0,0 +1,50 @@
+{
+  createScript,
+  replaceVars,
+  gnused,
+  jq,
+  fzf,
+  nix,
+  coreutils,
+  bash,
+  nix-search-fzf,
+  writeShellScript,
+}:
+
+let
+  previewText = createScript "fzf-preview" ./fzf-preview.sh { };
+  src = replaceVars ./nix-search-fzf.sh {
+    previewText = "${previewText}/bin/fzf-preview";
+  };
+in
+createScript "nix-search-fzf" src {
+  dependencies = [
+    gnused
+    jq
+    fzf
+    nix
+    coreutils
+    bash
+  ];
+
+  # Enter a 'nix shell' with packages selected by this script
+  passthru.zsh-shell-widget = writeShellScript "nix-search-fzf-shell-widget" ''
+    nix-search-fzf-shell-widget() {
+      setopt localoptions pipefail no_aliases 2> /dev/null
+      local cmd="$(eval "${nix-search-fzf}/bin/nix-search-fzf -c")"
+      if [[ -z "$cmd" ]]; then
+      	zle redisplay
+      	return 0
+      fi
+      zle push-line
+      BUFFER="''${cmd}"
+      zle accept-line
+      local ret=$?
+      unset cmd
+      zle reset-prompt
+      return $ret
+    }
+  '';
+
+  meta.description = "a wrapper around 'nix {run,shell,edit}' with autocomplete using fzf";
+}

pkgs/nix-search-fzf/fzf-preview.sh

@@ -0,0 +1,73 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p
+# shellcheck shell=bash
+
+set -euo pipefail
+
+PKG_NAME="$1"
+FLAKE="$2"
+FLAKE_PATH="${FLAKE}#${PKG_NAME}"
+
+removeQuotes() {
+  local flag="$*"
+  flag="${flag%\"}"
+  echo "${flag#\"}"
+}
+
+newlinesToCommaSeperated() {
+  echo "$@" | sed ':a;N;$!ba;s/\n/, /g'
+}
+
+evalAttr() {
+  local attr data
+  attr="$1"
+  data="$(nix eval "$FLAKE_PATH"."$attr" 2>/dev/null)"
+  [[ $data != "null" && $data != "false" && -n $data ]] && removeQuotes "$data"
+}
+
+evalJsonAttr() {
+  local attr jqArgs data
+  attr="$1"
+  jqArgs="$2"
+  data="$(nix eval --json "$FLAKE_PATH"."$attr" 2>/dev/null | jq -r "$jqArgs")"
+  [[ $data != "null" && -n $data ]] && echo "$data"
+}
+
+evalNixpkgsLib() {
+  local function data
+  function="$1"
+  # Impure is needed to import the flake reference
+  data="$(nix eval --raw --impure --expr "let pkgs = (builtins.getFlake \"flake:$FLAKE\"); in pkgs.lib.$function pkgs.$PKG_NAME" 2>/dev/null)"
+  [[ $data != "null" && -n $data ]] && echo "$data"
+}
+
+maybeEcho() {
+  local -r prefix="$1"
+  local flag="$2"
+  local -r commaSeperated="${3:-false}"
+  [[ $commaSeperated == "true" ]] && flag="$(newlinesToCommaSeperated "$flag")"
+  test -n "$flag" && echo "$prefix $flag"
+}
+
+test -n "$(evalAttr "meta.broken")" && echo "broken: true"
+test -n "$(evalAttr "meta.insecure")" && echo "insecure: true"
+
+version="$(evalAttr "version")"
+# Derive the version from "name" using 'lib.getVersion' if it's not set
+test -z "$version" && version="$(evalNixpkgsLib "getVersion")"
+maybeEcho "version:" "$version"
+
+homepage="$(evalAttr "meta.homepage")"
+maybeEcho "homepage:" "$homepage"
+
+description="$(evalAttr "meta.description")"
+maybeEcho "description:" "$description"
+
+license="$(evalJsonAttr "meta.license" 'if type=="array" then .[].fullName else .fullName end')"
+maybeEcho "license:" "$license" true
+
+maintainers="$(evalJsonAttr "meta.maintainers" '.[].github')"
+maybeEcho "maintainers:" "$maintainers" true
+
+platforms="$(evalJsonAttr "meta.platforms" 'if type=="array" then .[] else . end')"
+maybeEcho "platforms:" "$platforms" true

pkgs/nix-search-fzf/nix-search-fzf.sh

@@ -0,0 +1,161 @@
+#!/usr/bin/env bash
+
+# An fzf script with autocomplete from "nix search" which allows for interactive fuzzy searching of derivations.
+# After the search a nix subcommand is executed on the selected derivation(s), e.g. "nix shell" or "nix run".
+
+set -eou pipefail
+
+FLAKE="nixpkgs"         # The default flake to use. TODO: make this configurable
+NIX_SUBCOMMAND="shell"  # The default nix subcommand to execute
+MULTIPLE_SELECTION=true # Whether to allow the user to select multiple derivations
+PRINT_COMMAND=false     # Only print the command that would be executed, don't execute it
+
+if [ -n "${XDG_CACHE_HOME-}" ]; then
+  CACHE_PATH="$XDG_CACHE_HOME/nix-search-fzf/cache.txt"
+else
+  CACHE_PATH="$HOME/.cache/nix-search-fzf/cache.txt"
+fi
+
+# Because fzf executes commands from keybindings in a subprocess, we cannot directly change this scripts state.
+# Instead we can use a temporary file as an IPC mechanism, to change which subcommand to execute.
+TMP_FILE="$(mktemp --dry-run --suffix "-nix-search-fzf")"
+trap 'rm -f "$TMP_FILE"' EXIT INT TERM
+
+handleArguments() {
+  while (("$#" > 0)); do
+    case "$1" in
+    -s | shell | --shell)
+      NIX_SUBCOMMAND="shell"
+      ;;
+    -b | build | --build)
+      NIX_SUBCOMMAND="build"
+      ;;
+    -r | run | --run)
+      NIX_SUBCOMMAND="run"
+      MULTIPLE_SELECTION=false
+      ;;
+    -e | edit | --edit)
+      NIX_SUBCOMMAND="edit"
+      MULTIPLE_SELECTION=false
+      ;;
+    -c | command | --command)
+      PRINT_COMMAND=true
+      ;;
+    -u | update | --update)
+      manageCache true
+      exit
+      ;;
+    -h | help | --help)
+      echo "Usage: $(basename "$0") [--shell|--build|--run|--edit|--update]"
+      echo "  --shell: enter a nix shell with the selected package(s). This is the default"
+      echo "  --build: build the selected package(s) with nix build"
+      echo "  --run: run the selected package with nix run"
+      echo "  --edit: edit the selected package with nix edit"
+      echo "  --command: only print the command that would be executed, don't execute it"
+      echo "  --update: update the nix search cache, this is done automatically every 10 days"
+      echo "  --help: show this help message"
+      exit 0
+      ;;
+    *)
+      echo "Unknown option '$1'"
+      exit 1
+      ;;
+    esac
+    shift 1
+  done
+}
+
+runColored() {
+  printf "\e[32m\$ %s\n\e[0m" "$1"
+  eval "$1"
+}
+
+manageCache() {
+  local doUpdate="${1:-false}"
+  mkdir -p "$(dirname "$CACHE_PATH")"
+
+  if [ ! -f "$CACHE_PATH" ] || [ ! -s "$CACHE_PATH" ]; then
+    doUpdate="true"
+    echo "attribute path cache does not exist, generating..." >&2
+  elif (($(date -r "$CACHE_PATH" +%s) < $(date -d "now - 10 days" +%s))); then
+    doUpdate="true"
+    echo "cache file is older than 10 days, updating..." >&2
+  fi
+
+  if [ "$doUpdate" == "true" ]; then
+    echo "caching attribute paths..." >&2
+    # Create a list of all attribute paths with "legacyPackages.$arch" stripped
+    # In the future this could contain metadata as well, doing a "nix-eval" for each is not the fastest
+    nix search "$FLAKE" "^" --quiet --json | jq -r 'keys[]' | cut -d'.' -f3- >"$CACHE_PATH"
+    echo "successfully generated attribute path cache" >&2
+  fi
+}
+
+fzfBindingFlag() {
+  local tmpFile="$1"
+  local -A bindings=(
+    ["shell"]="ctrl-s"
+    ["build"]="ctrl-b"
+    ["edit"]="ctrl-e"
+    ["run"]="ctrl-r"
+  )
+
+  local result="--bind="
+  for subCommand in "${!bindings[@]}"; do
+    local binding="${bindings[$subCommand]}"
+    # When pressed, write the appropriate command to our temporary IPC file, and change the prompt accordingly
+    result+="$binding:execute-silent(echo $subCommand > $tmpFile)+change-prompt($subCommand > ),"
+  done
+  echo "${result%,}"
+}
+
+runFzf() {
+  local multi_flag
+  if [ "$MULTIPLE_SELECTION" == true ]; then
+    multi_flag="--multi"
+  else
+    multi_flag="--no-multi"
+  fi
+
+  fzf "$multi_flag" \
+    --height 40% \
+    --preview-window right,70% \
+    --border rounded \
+    --prompt "$NIX_SUBCOMMAND > " \
+    --preview "bash -c \"@previewText@ {} $FLAKE\"" \
+    "$(fzfBindingFlag "$TMP_FILE")" <"$CACHE_PATH"
+}
+
+runNix() {
+  local packages selectedPkgs command
+  readarray -t selectedPkgs <<<"$@"
+  ((${#selectedPkgs[@]} == 0)) && exit 0
+
+  if [ "$MULTIPLE_SELECTION" == true ] && ((${#selectedPkgs[@]} > 1)); then
+    # Build a brace expansion string
+    local pkg_list="{"
+    for pkg in "${selectedPkgs[@]}"; do
+      pkg_list+="$pkg,"
+    done
+    packages="${pkg_list%,}}"
+  else
+    packages="${selectedPkgs[0]}"
+  fi
+
+  ((${#packages} == 0)) && exit 0
+
+  # Update what subcommand to execute, in case it was changed by a keybinding from fzf
+  [ -s "$TMP_FILE" ] && NIX_SUBCOMMAND="$(<"$TMP_FILE")"
+
+  command="NIXPKGS_ALLOW_UNFREE=1 nix $NIX_SUBCOMMAND $FLAKE#$packages --impure"
+  if [ "$PRINT_COMMAND" == true ]; then
+    echo "$command"
+    exit 0
+  else
+    runColored "$command"
+  fi
+}
+
+handleArguments "$@"
+manageCache
+runNix "$(runFzf)"