neovim-flake/modules/plugins/tabline/nvim-bufferline/config.nix

{
  config,
  lib,
  ...
}: let
  inherit (lib.modules) mkIf mkMerge;
  inherit (lib.nvim.binds) mkLuaBinding mkBinding pushDownDefault;
  inherit (lib.nvim.dag) entryAnywhere;
  inherit (lib.nvim.lua) toLuaObject;

  cfg = config.vim.tabline.nvimBufferline;
  self = import ./nvim-bufferline.nix {inherit lib;};
  inherit (self.options.vim.tabline.nvimBufferline) mappings;
in {
  config = mkIf cfg.enable {
    vim = {
      startPlugins = [
        "nvim-bufferline-lua"
        "bufdelete-nvim"
      ];

      # Soft-dependency for bufferline.
      # Recommended by upstream, so enabled here.
      visuals.nvim-web-devicons.enable = true;

      maps.normal = mkMerge [
        (mkLuaBinding cfg.mappings.closeCurrent "require(\"bufdelete\").bufdelete" mappings.closeCurrent.description)
        (mkBinding cfg.mappings.cycleNext ":BufferLineCycleNext<CR>" mappings.cycleNext.description)
        (mkBinding cfg.mappings.cycleNext ":BufferLineCycleNext<CR>" mappings.cycleNext.description)
        (mkBinding cfg.mappings.cyclePrevious ":BufferLineCyclePrev<CR>" mappings.cyclePrevious.description)
        (mkBinding cfg.mappings.pick ":BufferLinePick<CR>" mappings.pick.description)
        (mkBinding cfg.mappings.sortByExtension ":BufferLineSortByExtension<CR>" mappings.sortByExtension.description)
        (mkBinding cfg.mappings.sortByDirectory ":BufferLineSortByDirectory<CR>" mappings.sortByDirectory.description)
        (mkLuaBinding cfg.mappings.sortById "function() require(\"bufferline\").sort_buffers_by(function (buf_a, buf_b) return buf_a.id < buf_b.id end) end" mappings.sortById.description)
        (mkBinding cfg.mappings.moveNext ":BufferLineMoveNext<CR>" mappings.moveNext.description)
        (mkBinding cfg.mappings.movePrevious ":BufferLineMovePrev<CR>" mappings.movePrevious.description)
      ];

      binds.whichKey.register = pushDownDefault {
        "<leader>b" = "+Buffer";
        "<leader>bm" = "BufferLineMove";
        "<leader>bs" = "BufferLineSort";
        "<leader>bsi" = "BufferLineSortById";
      };

      pluginRC.nvimBufferline = entryAnywhere ''
        require("bufferline").setup(${toLuaObject cfg.setupOpts})
      '';
    };
  };
}