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

{
  config,
  lib,
  ...
}: let
  inherit (lib) mkIf mkMerge mkLuaBinding mkBinding nvim;

  cfg = config.vim.tabline.nvimBufferline;
  self = import ./nvim-bufferline.nix {
    inherit lib;
  };
  mappings = self.options.vim.tabline.nvimBufferline.mappings;
in {
  config = mkIf cfg.enable (
    let
      mouse = {
        right = "'vertical sbuffer %d'";
        close = ''
          function(bufnum)
            require("bufdelete").bufdelete(bufnum, false)
          end
        '';
      };
    in {
      vim.startPlugins = [
        (assert config.vim.visuals.nvimWebDevicons.enable == true; "nvim-bufferline-lua")
        "bufdelete-nvim"
      ];

      vim.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)
      ];

      vim.luaConfigRC.nvimBufferline = nvim.dag.entryAnywhere ''
        require("bufferline").setup{
           options = {
              mode = "buffers",
              numbers = "both",
              close_command = ${mouse.close},
              right_mouse_command = ${mouse.right},
              indicator = {
                style = 'icon',
                indicator_icon = '▎',
              },
              buffer_close_icon = '󰅖',
              modified_icon = '●',
              close_icon = '',
              left_trunc_marker = '',
              right_trunc_marker = '',
              max_name_length = 18,
              max_prefix_length = 15,
              tab_size = 18,
              show_buffer_icons = true,
              show_buffer_close_icons = true,
              show_close_icon = true,
              show_tab_indicators = true,
              persist_buffer_sort = true,
              --separator_style = "thin",
              separator_style = { " ", " " },
              enforce_regular_tabs = true,
              always_show_bufferline = true,
              offsets = {
                {filetype = "NvimTree", text = "File Explorer", text_align = "center"}
              },
              sort_by = 'extension',
              diagnostics = "nvim_lsp", -- TODO: use coc if it's enabled
              diagnostics_update_in_insert = true,
              diagnostics_indicator = function(count, level, diagnostics_dict, context)
                 local s = ""
                 for e, n in pairs(diagnostics_dict) do
                    local sym = e == "error" and ""
                       or (e == "warning" and "" or "" )
                    if(sym ~= "") then
                    s = s .. " " .. n .. sym
                    end
                 end
                 return s
              end,
              numbers = function(opts)
                return string.format('%s·%s', opts.raise(opts.id), opts.lower(opts.ordinal))
              end,
           }
        }
      '';
    }
  );
}