neovim-flake/lib/types/plugins.nix

{
  inputs,
  lib,
  ...
}: let
  inherit (lib.options) mkOption;
  inherit (lib.attrsets) attrNames mapAttrs' filterAttrs nameValuePair;
  inherit (lib.strings) hasPrefix removePrefix;
  inherit (lib.types) submodule either package enum str lines attrsOf anything listOf nullOr oneOf;
  # Get the names of all flake inputs that start with the given prefix.
  fromInputs = {
    inputs,
    prefix,
  }:
    mapAttrs' (n: v: nameValuePair (removePrefix prefix n) {src = v;}) (filterAttrs (n: _: hasPrefix prefix n) inputs);

  #  Get the names of all flake inputs that start with the given prefix.
  pluginInputNames = attrNames (fromInputs {
    inherit inputs;
    prefix = "plugin-";
  });

  # You can either use the name of the plugin or a package.
  pluginType = nullOr (
    either
    package
    (enum (pluginInputNames ++ ["nvim-treesitter" "flutter-tools-patched" "vim-repeat"]))
  );

  pluginsType = listOf pluginType;

  extraPluginType = submodule {
    options = {
      package = mkOption {
        type = pluginType;
        description = "Plugin Package.";
      };

      after = mkOption {
        type = listOf str;
        default = [];
        description = "Setup this plugin after the following ones.";
      };

      setup = mkOption {
        type = lines;
        default = "";
        description = "Lua code to run during setup.";
        example = "require('aerial').setup {}";
      };
    };
  };

  luaInline = lib.mkOptionType {
    name = "luaInline";
    check = x: lib.nvim.lua.isLuaInline x;
  };

  lznPluginType = submodule {
    options = {
      ## Should probably infer from the actual plugin somehow
      ## In general this is the name passed to packadd, so the dir name of the plugin
      # name = mkOption {
      #   type=  str;
      # }

      package = pluginType;

      before = mkOption {
        type = nullOr luaInline;
        description = "Code to run before plugin is loaded";
        default = null;
      };

      after = mkOption {
        type = nullOr luaInline;
        description = "Code to run after plugin is loaded";
        default = null;
      };

      event = mkOption {
        description = "Lazy-load on event";
        default = "null";
        type = let
          event = submodule {
            options = {
              event = mkOption {
                type = nullOr (either str (listOf str));
                description = "Exact event name";
                example = "BufEnter";
              };
              pattern = mkOption {
                type = nullOr (either str (listOf str));
                description = "Event pattern";
                example = "BufEnter *.lua";
              };
            };
          };
        in
          oneOf [str (listOf str) event];
      };

      cmd = mkOption {
        description = "Lazy-load on command";
        default = null;
        type = nullOr (either str (listOf str));
      };

      ft = mkOption {
        description = "Lazy-load on filetype";
        default = null;
        type = nullOr (either str (listOf str));
      };

      keys = mkOption {
        description = "Lazy-load on key mapping";
        default = null;
        type = nullOr (either str (listOf str)); # TODO: support lz.n.KeysSpec
      };

      # TODO: enabled, beforeAll, colorscheme, priority, load
    };
  };
in {
  inherit extraPluginType fromInputs pluginType luaInline lznPluginType;

  pluginsOpt = {
    description,
    example,
    default ? [],
  }:
    mkOption {
      inherit example description default;
      type = pluginsType;
    };

  /*
  opts is a attrset of options, example:
  ```
  mkPluginSetupOption "telescope" {
    file_ignore_patterns = mkOption {
      description = "...";
      type = types.listOf types.str;
      default = [];
    };
    layout_config.horizontal = mkOption {...};
  }
  ```
  */
  mkPluginSetupOption = pluginName: opts:
    mkOption {
      description = ''
        Option table to pass into the setup function of ${pluginName}

        You can pass in any additional options even if they're
        not listed in the docs
      '';

      default = {};
      type = submodule {
        freeformType = attrsOf anything;
        options = opts;
      };
    };
}