Workaround clear_stl for lualine

Of course the bullshittery of lualine continues...

I am so fed up with lualine, I now detect when people use this cursed
statusline plugin and apply workarounds.

Maybe I should add a g:my_next_statusline_wont_be_lualine option
instead?

I don't want to start a rant again, people can refer to
4d8acfd and other commits instead if
they desire.

Fixes #51

Author: vimpostor

autoload/tpipeline/util.vim

@@ -30,10 +30,19 @@ func tpipeline#util#clear_stl()
 	set stl=%#StatusLine#
 endfunc
 
+func tpipeline#util#is_lualine()
+	" lualine doesn't play nice, so it needs extra workarounds
+	return has('nvim') && !empty(nvim_get_autocmds(#{group: "lualine"}))
+endfunc
+
 func tpipeline#util#set_stl_hooks()
 	if empty(g:tpipeline_statusline) && !g:tpipeline_tabline
 		if g:tpipeline_clearstl
-			au OptionSet statusline if v:option_type == 'global' | call tpipeline#util#clear_stl() | endif
+			if tpipeline#util#is_lualine()
+				au OptionSet statusline call tpipeline#util#clear_stl()
+			else
+				au OptionSet statusline if v:option_type == 'global' | call tpipeline#util#clear_stl() | endif
+			endif
 		endif
 		au OptionSet statusline call tpipeline#update()
 	endif