require'lualine'.setup {
  options = {
    icons_enabled = true,
    theme = 'auto',
    component_separators = { left = '', right = ''},
    section_separators = { left = '', right = ''},
    disabled_filetypes = {},
    always_divide_middle = true,
  },
  sections = {
    lualine_a = {'mode'},
    lualine_b = {'branch', 'diff',
                  {'diagnostics', sources={'nvim_lsp', 'coc'}}},
    lualine_c = {'filename'},
    lualine_x = {'encoding', 'fileformat', 'filetype'},
    lualine_y = {'progress'},
    lualine_z = {'location'}
  },
  inactive_sections = {
    lualine_a = {},
    lualine_b = {},
    lualine_c = {'filename'},
    lualine_x = {'location'},
    lualine_y = {},
    lualine_z = {}
  },
  tabline = {},
  extensions = {}
}

local custom_gruvbox = require'lualine.themes.gruvbox'
-- Change the background of lualine_c section for normal mode
custom_gruvbox.normal.c.bg = '#112233' -- rgb colors are supported
require'lualine'.setup{
  options = { theme  = custom_gruvbox },
  ...
}

options = {section_separators = '', component_separators = ''}

options = {
  theme = 'auto',          -- lualine theme
  component_separators = {left = '', right = ''},
  section_separators = {left = '', right = ''},
  disabled_filetypes = {},  -- filetypes to diable lualine on
  always_divide_middle = true, -- When true left_sections (a,b,c) can't
                               -- take over entiee statusline even
                               -- when none of section x, y, z is present.
}

sections = {
  lualine_a = {
    {
      'mode',
      icons_enabled = true, -- displays icons in alongside component
      icon = nil,      -- displays icon in front of the component
      separator = nil, -- Determines what separator to use for the component.
                       -- when a string is given it's treated as component_separator.
                       -- When a table is given it's treated as section_separator.
                       -- This options can be used to set colored separators
                       -- arround component. Option need to be set like
                       -- `separator = { left = '', right = ''}`.
                       -- Where left will be placed in left side of component
                       -- and right will be placed in right side of component
                       -- Passing empty string disables that separator
      cond = nil, -- condition function, component is loaded when function returns true
      -- custom color for component in format
      -- color = {fg = '#rrggbb', bg= '#rrggbb', gui='style'}
      -- or highlight group
      -- color = "WarningMsg"
      color = nil,
      -- Type option specifies what type a component is.
      -- When type is omitted lualine will guess it.
      -- Available types [format: type_name(example)]
      -- mod(branch/filename), stl(%f/%m), var(g:coc_status/bo:modifiable),
      -- lua_expr(lua expressions), vim_fun(viml function name)
      -- lua_expr is short for lua-expression and vim_fun is short fror vim-function
      type = nil,
      padding = 1, -- adds padding to the left and right of components
                   -- padding can be specified to left or right separately like
                   -- padding = { left = left_padding, right = right_padding }
      fmt = nil,   -- format function, formats component's output
    }
  }
}

sections = {
  lualine_a = {
    {
      'buffers',
      show_filename_only = true, -- shows shortened relative path when false
      show_modified_status = true -- shows indicator then bufder is modified
      max_length = vim.o.columns * 2 / 3, -- maximum width of buffers component
      filetype_names = {
        TelescopePrompt = 'Telescope',
        dashboard = 'Dashboard',
        packer = 'Packer',
        fzf = 'FZF',
        alpha = 'Alpha'
      }, -- shows specific buffer name for that filetype ( { `filetype` = `buffer_name`, ... } )
      buffers_color = {
        active = nil,   -- color for active buffer
        inactive = nil, -- color for inactive buffer
      },
    }
  }
}

sections = {
  lualine_a = {
    {
      'diagnostics',
      -- table of diagnostic sources, available sources:
      -- 'nvim_lsp', 'nvim', 'coc', 'ale', 'vim_lsp'
      -- Or a function that returns a table like
      --   {error=error_cnt, warn=warn_cnt, info=info_cnt, hint=hint_cnt}
      sources = {'nvim_lsp', 'coc'},
      -- displays diagnostics from defined severity
      sections = {'error', 'warn', 'info', 'hint'},
      -- all colors are in format #rrggbb
      diagnostics_color = {
        error = nil, -- changes diagnostic's error color
        warn = nil,  -- changes diagnostic's warn color
        info = nil,  -- Changes diagnostic's info color
        hint = nil,  -- Changes diagnostic's hint color
      }
      symbols = {error = 'E', warn = 'W', info = 'I', hint = 'H'}
      update_in_insert = false, -- Update diagnostics in insert mode
      always_visible = false, -- Show diagnostics even if count is 0, boolean or function returning boolean
    }
  }
}

sections = {
  lualine_a = {
    {
      'filename',
      file_status = true,  -- displays file status (readonly status, modified status)
      path = 0,            -- 0 = just filename, 1 = relative path, 2 = absolute path
      shorting_target = 40 -- Shortens path to leave 40 space in the window
                           -- for other components. Terrible name any suggestions?
    }
  }
}

sections = {
  lualine_a = {
    {
      'filetype',
      colored = true, -- displays filetype icon in color if set to `true
      icon_only = false -- Display only icon for filetype
    }
  }
}

sections = {
  lualine_a = {
    {
      'diff',
      colored = true, -- displays diff status in color if set to true
      -- all colors are in format #rrggbb
      diff_color = {
        added = nil,    -- changes diff's added color
        modified = nil, -- changes diff's modified color
        removed = nil,  -- changes diff's removed color
      }
      symbols = {added = '+', modified = '~', removed = '-'} -- changes diff symbols
      source = nil, -- A function that works as a data source for diff.
                    -- it must return a table like
                    -- {added = add_count, modified = modified_count, removed = removed_count }
                    -- Or nil on failure. Count <= 0 won't be displayed.
    }
  }
}

sections = {
  lualine_a = {
    {
      'tabs',
      max_length = vim.o.columns / 3, -- maximum width of tabs component
      mode = 0, -- 0  shows tab_nr
                -- 1  shows tab_name
                -- 2  shows tab_nr + tab_name
      tabs_color = {
        active = nil,   -- color for active tab
        inactive = nil, -- color for inactive tab
      },
    }
  }
}

local my_extension = {sections = {lualine_a = 'mode'}, filetypes = {'lua'}}
require'lualine'.setup {extensions = {my_extension}}