return {
  "rebelot/heirline.nvim",
  config = function()
    local conditions = require("heirline.conditions")
    local heirline = require('heirline')

    local utils = require("heirline.utils")

    local Space = { provider = " " }
    local colors = {
      bright_bg = utils.get_highlight("Folded").bg,
      bright_fg = utils.get_highlight("Folded").fg,
      red = utils.get_highlight("DiagnosticError").fg,
      -- dark_red = utils.get_highlight("DiffDelete").bg,
      green = utils.get_highlight("String").fg,
      blue = utils.get_highlight("Function").fg,
      gray = utils.get_highlight("NonText").fg,
      orange = utils.get_highlight("Constant").fg,
      purple = utils.get_highlight("Statement").fg,
      cyan = utils.get_highlight("Special").fg,
      diag_warn = utils.get_highlight("DiagnosticWarn").fg,
      diag_error = utils.get_highlight("DiagnosticError").fg,
      diag_hint = utils.get_highlight("DiagnosticHint").fg,
      diag_info = utils.get_highlight("DiagnosticInfo").fg,
      -- git_del = utils.get_highlight("diffDeleted").fg,
      -- git_add = utils.get_highlight("diffAdded").fg,
      -- git_change = utils.get_highlight("diffChanged").fg,
    }

    heirline.load_colors(colors)

    -- --------------------------------------------------------------
    local ViMode = {
      -- get vim current mode, this information will be required by the provider
      -- and the highlight functions, so we compute it only once per component
      -- evaluation and store it as a component attribute
      init = function(self)
        self.mode = vim.fn.mode(1) -- :h mode()

        -- execute this only once, this is required if you want the ViMode
        -- component to be updated on operator pending mode
        if not self.once then
          vim.api.nvim_create_autocmd("ModeChanged", {
            pattern = "*:*o",
            command = 'redrawstatus'
          })
          self.once = true
        end
      end,
      -- Now we define some dictionaries to map the output of mode() to the
      -- corresponding string and color. We can put these into `static` to compute
      -- them at initialisation time.
      static = {
        mode_names = { -- change the strings if you like it vvvvverbose!
          n = "N",
          no = "N?",
          nov = "N?",
          noV = "N?",
          ["no\22"] = "N?",
          niI = "Ni",
          niR = "Nr",
          niV = "Nv",
          nt = "Nt",
          v = "V",
          vs = "Vs",
          V = "V_",
          Vs = "Vs",
          ["\22"] = "^V",
          ["\22s"] = "^V",
          s = "S",
          S = "S_",
          ["\19"] = "^S",
          i = "I",
          ic = "Ic",
          ix = "Ix",
          R = "R",
          Rc = "Rc",
          Rx = "Rx",
          Rv = "Rv",
          Rvc = "Rv",
          Rvx = "Rv",
          c = "C",
          cv = "Ex",
          r = "...",
          rm = "M",
          ["r?"] = "?",
          ["!"] = "!",
          t = "T",
        },
        mode_colors = {
          n = "red",
          i = "green",
          v = "cyan",
          V = "cyan",
          ["\22"] = "cyan",
          c = "orange",
          s = "purple",
          S = "purple",
          ["\19"] = "purple",
          R = "orange",
          r = "orange",
          ["!"] = "red",
          t = "red",
        }
      },
      -- We can now access the value of mode() that, by now, would have been
      -- computed by `init()` and use it to index our strings dictionary.
      -- note how `static` fields become just regular attributes once the
      -- component is instantiated.
      -- To be extra meticulous, we can also add some vim statusline syntax to
      -- control the padding and make sure our string is always at least 2
      -- characters long. Plus a nice Icon.
      provider = function(self)
        return "%1(" .. self.mode_names[self.mode] .. "%)"
      end,
      -- Same goes for the highlight. Now the foreground will change according to the current mode.
      hl = function(self)
        local mode = self.mode:sub(1, 1) -- get only the first mode character
        return { fg = self.mode_colors[mode], bold = true, }
      end,
      -- Re-evaluate the component only on ModeChanged event!
      -- This is not required in any way, but it's there, and it's a small
      -- performance improvement.
      update = {
        "ModeChanged",
      },
    }
    -- --------------------------------------------------------------
    local FileNameBlock = {
      -- let's first set up some attributes needed by this component and it's children
      init = function(self)
        self.filename = vim.api.nvim_buf_get_name(0)
      end,
    }
    -- We can now define some children separately and add them later

    local FileIcon = {
      init = function(self)
        local filename = self.filename
        local extension = vim.fn.fnamemodify(filename, ":e")
        self.icon, self.icon_color = require("nvim-web-devicons").get_icon_color(filename, extension,
          { default = true })
      end,
      provider = function(self)
        return self.icon and (self.icon .. " ")
      end,
      hl = function(self)
        return { fg = self.icon_color }
      end
    }

    local FileName = {
      provider = function(self)
        -- first, trim the pattern relative to the current directory. For other
        -- options, see :h filename-modifiers
        local filename = vim.fn.fnamemodify(self.filename, ":.")
        if filename == "" then return "[No Name]" end
        -- now, if the filename would occupy more than 1/4th of the available
        -- space, we trim the file path to its initials
        -- See Flexible Components section below for dynamic truncation
        if not conditions.width_percent_below(#filename, 0.5) then
          filename = vim.fn.pathshorten(filename)
        end
        return filename
      end,
      hl = { fg = utils.get_highlight("Directory").fg },
    }

    local FileFlags = {
      {
        condition = function()
          return vim.bo.modified
        end,
        provider = "[+]",
        hl = { fg = "green" },
      },
      {
        condition = function()
          return not vim.bo.modifiable or vim.bo.readonly
        end,
        provider = "",
        hl = { fg = "orange" },
      },
    }

    -- Now, let's say that we want the filename color to change if the buffer is
    -- modified. Of course, we could do that directly using the FileName.hl field,
    -- but we'll see how easy it is to alter existing components using a "modifier"
    -- component

    local FileNameModifier = {
      hl = function()
        if vim.bo.modified then
          -- use `force` because we need to override the child's hl foreground
          return { fg = "cyan", bold = true, force = true }
        end
      end,
    }

    -- let's add the children to our FileNameBlock component
    FileNameBlock = utils.insert(FileNameBlock,
      FileIcon,
      utils.insert(FileNameModifier, FileName), -- a new table where FileName is a child of FileNameModifier
      FileFlags,
      { provider = '%<' }                      -- this means that the statusline is cut here when there's not enough space
    )
    -- --------------------------------------------------------------
    -- We're getting minimalists here!
    local Ruler = {
      -- %l = current line number
      -- %L = number of lines in the buffer
      -- %c = column number
      -- %P = percentage through file of displayed window
      provider = "%7(%l/%3L%):%2c %P",
    }
    -- --------------------------------------------------------------

    local LSPActive = {
      condition = conditions.lsp_attached,
      update    = { 'LspAttach', 'LspDetach' },

      -- You can keep it simple,
      -- provider = " [LSP]",

      -- Or complicate things a bit and get the servers names
      provider  = function()
        local names = {}
        for i, server in pairs(vim.lsp.get_clients({ bufnr = 0 })) do
          table.insert(names, server.name)
        end
        return " " .. table.concat(names, ",")
      end,
      hl        = { fg = "green", bold = true },
    }
    local LSPMessages = {
      provider = vim.lsp.status(),
      hl = { fg = "gray" },
    }
    -- --------------------------------------------------------------
    local Diagnostics = {

      condition = conditions.has_diagnostics,

      static = {
        -- these require something...
        error_icon = "✘",
        warn_icon = "",
        info_icon = "◉",
        hint_icon = "",
      },

      init = function(self)
        self.errors = #vim.diagnostic.get(0, { severity = vim.diagnostic.severity.ERROR })
        self.warnings = #vim.diagnostic.get(0, { severity = vim.diagnostic.severity.WARN })
        self.hints = #vim.diagnostic.get(0, { severity = vim.diagnostic.severity.HINT })
        self.info = #vim.diagnostic.get(0, { severity = vim.diagnostic.severity.INFO })
      end,

      update = { "DiagnosticChanged", "BufEnter" },

      {
        provider = function(self)
          -- 0 is just another output, we can decide to print it or not!
          return self.errors > 0 and (self.error_icon .. self.errors .. " ")
        end,
        hl = { fg = "diag_error" },
      },
      {
        provider = function(self)
          return self.warnings > 0 and (self.warn_icon .. self.warnings .. " ")
        end,
        hl = { fg = "diag_warn" },
      },
      {
        provider = function(self)
          return self.info > 0 and (self.info_icon .. self.info .. " ")
        end,
        hl = { fg = "diag_info" },
      },
      {
        provider = function(self)
          return self.hints > 0 and (self.hint_icon .. self.hints)
        end,
        hl = { fg = "diag_hint" },
      },
    }
    -- --------------------------------------------------------------
    local DAPMessages = {
      condition = function()
        local session = require("dap").session()
        return session ~= nil
      end,
      provider = function()
        return " " .. require("dap").status()
      end,
      hl = "Debug"
      -- see Click-it! section for clickable actions
    }
    -- --------------------------------------------------------------
    local WorkDir = {
      provider = function()
        local icon = (vim.fn.haslocaldir(0) == 1 and "l" or "g") .. " " .. " "
        local cwd = vim.fn.getcwd(0)
        cwd = vim.fn.fnamemodify(cwd, ":~")
        if not conditions.width_percent_below(#cwd, 0.25) then
          cwd = vim.fn.pathshorten(cwd)
        end
        local trail = cwd:sub(-1) == '/' and '' or "/"
        return icon .. cwd .. trail
      end,
      hl = { fg = "blue", bold = true },
    }
    -- --------------------------------------------------------------
    local Align = { provider = "%=" }
    -- ViMode = utils.surround({ "", "" }, "bright_bg", { ViMode })

    local DefaultStatusline = {
      ViMode, Space, FileNameBlock, Space, Align,
      Align, DAPMessages,
      LSPActive, Space, Diagnostics, Space, LSPMessages, Space, Ruler
    }

    local FileType = {
      provider = function()
        return string.upper(vim.bo.filetype)
      end,
      hl = { fg = utils.get_highlight("Type").fg, bold = true },
    }
    --
    local InactiveStatusline = {
      condition = conditions.is_not_active,
      FileNameBlock,
      Align,
    }

    local SpecialStatusline = {
      condition = function()
        return conditions.buffer_matches({
          buftype = { "nofile", "prompt", "help", "quickfix" },
          filetype = { "^git.*", "fugitive" },
        })
      end,

      FileType,
      Space,
      Align
    }
    local StatusLine = {

      hl = function()
        if conditions.is_active() then
          return "StatusLine"
        else
          return "StatusLineNC"
        end
      end,

      -- the first statusline with no condition, or which condition returns true is used.
      -- think of it as a switch case with breaks to stop fallthrough.
      fallthrough = false,

      SpecialStatusline,
      InactiveStatusline,
      DefaultStatusline,
    }

    local Winbar = { { provider = "»" }, Space }
    local TabLine = {}
    -- local StatusColumn = {}

    heirline.setup({
      statusline = StatusLine,
      -- winbar = Winbar,
      tabline = TabLine,
      -- statuscolumn = StatusColumn
    })
  end
}