Show file path in the winbar

init.lua

vim.o.winbar = "%{%v:lua.require'nvim.utils.nvim.winbar'.eval()%}"

winbar.lua

local M = {}

vim.api.nvim_set_hl(0, 'WinBarPath', { bg = '#dedede', fg = '#363636' })
vim.api.nvim_set_hl(0, 'WinBarModified', { bg = '#dedede', fg = '#ff3838' })

function M.eval()
    local file_path = vim.api.nvim_eval_statusline('%f', {}).str
    local modified = vim.api.nvim_eval_statusline('%M', {}).str == '+' and '⊚' or ''

    file_path = file_path:gsub('/', ' ➤ ')

    return '%#WinBarPath#'
     .. file_path
     .. '%*'
     .. '%#WinBarModified#'
     .. modified
     .. '%*'
end

return M

Thanks for this and your videos!
I've found the following function helpful

local function join_status_line(input, highlight, item)
  return input .. '%#' .. highlight .. '#' .. item .. '%*'
end

function M.eval()
    local winbar = ''
    -- do stuff.........
      winbar = join_status_line(winbar, 'WinBarPath', file_path)
      winbar = join_status_line(winbar, 'WinBarModified', modified)

     return winbar
end