Hide tabline when number of tabs is lower than two

[simonmandlik]

Hi,

in neovim 0.7 (and the latest version of lualine), this stopped working for me

autocmd OptionSet showtabline :set showtabline=1

Judging by #395, I'm not alone, but since the issue is closed, what is the preferrable way of achieving it? Thanks!

[fitrh]

Maybe you can do something like this

vim.api.nvim_create_autocmd({ "TabNew", "TabClosed" }, {
  group = vim.api.nvim_create_augroup("LualineTab", {}),
  callback = function()
    local show = #vim.api.nvim_list_tabpages() > 1
    vim.o.showtabline = show and 1 or 0
    require("lualine").hide({
      place = { "tabline" },
      unhide = show,
    })
  end,
})

The problem is, how to hide the tabline on the first launch?
It seems VimEnter did not work here

[simonmandlik]

Thank you, that would work, but it seems quite a lot of code for such simple setting. Given that showtabline is a standard vim setting, shouldn't code like this be a part of this plugin?

[fitrh]

I agree, by respecting user 'showtabline', it could be done simpler like this

diff --git a/lua/lualine.lua b/lua/lualine.lua
index a7db85f..00bee0c 100644
--- a/lua/lualine.lua
+++ b/lua/lualine.lua
@@ -469,7 +469,7 @@ local function set_tabline(hide)
       "call v:lua.require'lualine'.refresh({'kind': 'tabpage', 'place': ['tabline'], 'trigger': 'autocmd'})",
       'lualine_tal_refresh'
     )
-    modules.nvim_opts.set('showtabline', 2, { global = true })
+    modules.nvim_opts.set('showtabline', vim.o.showtabline, { global = true })
     timers.halt_tal_refresh = false
   else
     modules.nvim_opts.restore('tabline', { global = true })

What do you think @shadmansaleh? I can't find any reference behind the decision
to set 'showtabline' to 2 by default

[simonmandlik]

@shadmansaleh please?

[scienceplease]

Maybe you can do something like this

vim.api.nvim_create_autocmd({ "TabNew", "TabClosed" }, {
  group = vim.api.nvim_create_augroup("LualineTab", {}),
  callback = function()
    local show = #vim.api.nvim_list_tabpages() > 1
    vim.o.showtabline = show and 1 or 0
    require("lualine").hide({
      place = { "tabline" },
      unhide = show,
    })
  end,
})

The problem is, how to hide the tabline on the first launch? It seems VimEnter did not work here

A simpler hack would be to just create a dummy function-defined component in the tabline that sets vim.o.showtabline to your preferred setting. It's rather silly, but I couldn't find a better way to hook into lualine's API to detect when the tabline is set. Hopefully the actual fix will get merged soon.

  tabline = {
      lualine_c = {
          function() vim.o.showtabline = 1; return '' end
      },

[sleeptightAnsiC]

Here it is:

lualine.nvim/README.md

Lines 433 to 435 in 0a5a668

	cond = nil, -- Condition function, the component is loaded when the function returns `true`.

{
	'tabs',
	cond = function() return 2 <= #vim.api.nvim_list_tabpages() end,
},

Using this does the trick on my side.

[alexspa]

If I combine it with vim.opt.showtabline = 1 the margin required by the tabline also gets set as expected

{
'tabs',
cond = function()
    vim.opt.showtabline = 1
    return 2 <= #vim.api.nvim_list_tabpages()
end,
}