nix-community.nixvim/plugins/helpers.nix

{ lib, ... }:
with lib;
rec {
  # vim dictionaries are, in theory, compatible with JSON
  toVimDict = args: toJSON 
    (lib.filterAttrs (n: v: !isNull v) args);

  # Black functional magic that converts a bunch of different Nix types to their
  # lua equivalents!
  toLuaObject = args:
    if builtins.isAttrs args then
      "{" + (concatStringsSep ","
        (mapAttrsToList
          (n: v: "[${toLuaObject n}] = " + (toLuaObject v))
        (filterAttrs (n: v: !isNull v || v == {}) args))) + "}"
    else if builtins.isList args then
      "{" + concatMapStringsSep "," toLuaObject args + "}"
    else if builtins.isString args then
      # This should be enough!
      escapeShellArg args
    else if builtins.isBool args then
      "${ boolToString args }"
    else if builtins.isFloat args then
      "${ toString args }"
    else if builtins.isInt args then
      "${ toString args }"
    else if isNull args then
      "nil"
    else "";

  # Generates maps for a lua config
  genMaps = mode: maps: let
    normalized = builtins.mapAttrs (key: action:
      if builtins.isString action then
        {
          silent = false;
          expr = false;
          unique = false;
          noremap = true;
          script = false;
          nowait = false;
          action = action;
        }
      else action) maps;
  in builtins.attrValues (builtins.mapAttrs (key: action:
    {
      action = action.action;
      config = lib.filterAttrs (_: v: v) {
        inherit (action) silent expr unique noremap script nowait;
      };
      key = key;
      mode = mode;
    }) normalized);

  # Creates an option with a nullable type that defaults to null.
  nullOrOption = type: desc: lib.mkOption {
    type = lib.types.nullOr type;
    default = null;
    description = desc;
  };
}