low-level-example.lua

local util = require('tabby.util')

local hl_tabline = util.extract_nvim_hl('TabLine')
local hl_normal = util.extract_nvim_hl('Normal')
local hl_tabline_sel = util.extract_nvim_hl('TabLineSel')
local hl_tabline_fill = util.extract_nvim_hl('TabLineFill')

local components = function()
  local coms = {
    {
      type = 'text',
      text = {
        '  ',
        hl = { fg = hl_tabline.fg, bg = hl_tabline.bg },
      },
    },
    {
      type = 'text',
      text = {
        '',
        hl = { fg = hl_tabline.bg, bg = hl_tabline_fill.bg },
      },
    },
  }
  local tabs = vim.api.nvim_list_tabpages()
  local current_tab = vim.api.nvim_get_current_tabpage()
  for _, tabid in ipairs(tabs) do
    if tabid == current_tab then
      table.insert(coms, {
        type = 'tab',
        tabid = tabid,
        label = {
          '  ' .. vim.api.nvim_tabpage_get_number(tabid) .. ' ',
          hl = { fg = hl_normal.fg, bg = hl_normal.bg, style = 'bold' },
        },
        left_sep = { '', hl = { fg = hl_normal.bg, bg = hl_tabline_fill.bg } },
        right_sep = { '', hl = { fg = hl_normal.bg, bg = hl_tabline_fill.bg } },
      })
      local wins = util.tabpage_list_wins(current_tab)
      local top_win = vim.api.nvim_tabpage_get_win(current_tab)
      for _, winid in ipairs(wins) do
        local icon = '  '
        if winid == top_win then
          icon = '  '
        end
        local bufid = vim.api.nvim_win_get_buf(winid)
        local buf_name = vim.api.nvim_buf_get_name(bufid)
        table.insert(coms, {
          type = 'win',
          winid = winid,
          label = icon .. vim.fn.fnamemodify(buf_name, ':~:.') .. ' ',
          left_sep = { '', hl = { fg = hl_tabline_sel.bg, bg = hl_tabline_fill.bg } },
          right_sep = { '', hl = { fg = hl_tabline_sel.bg, bg = hl_tabline_fill.bg } },
        })
      end
    else
      table.insert(coms, {
        type = 'tab',
        tabid = tabid,
        label = {
          '  ' .. vim.api.nvim_tabpage_get_number(tabid) .. ' ',
          hl = { fg = hl_tabline_sel.fg, bg = hl_tabline_sel.bg, style = 'bold' },
        },
        left_sep = { '', hl = { fg = hl_tabline_sel.bg, bg = hl_tabline_fill.bg } },
        right_sep = { '', hl = { fg = hl_tabline_sel.bg, bg = hl_tabline_fill.bg } },
      })
    end
  end
  -- empty space in line
  table.insert(coms, { type = 'text', text = { '', hl = 'TabLineFill' } })

  return coms
end

require('tabby').setup({
  components = components,
})