From cdb265c410c768169a0816784c054a3e3e22fb73 Mon Sep 17 00:00:00 2001
From: Christian <cb@256bit.org>
Date: Wed, 18 Nov 2020 18:41:17 +0100
Subject: [PATCH] tabline: fix errors in Vim9script title function

---
 autoload/airline/extensions/tabline.vim | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/autoload/airline/extensions/tabline.vim b/autoload/airline/extensions/tabline.vim
index 4762b17d..57b38073 100644
--- a/autoload/airline/extensions/tabline.vim
+++ b/autoload/airline/extensions/tabline.vim
@@ -393,16 +393,17 @@ else
   enddef
   def airline#extensions#tabline#title(n: number): string # {{{2
     var title = ''
-    if s:taboo
-      title = TabooTabTitle(n)
+    if get(g:, 'airline#extensions#taboo#enabled', 1) &&
+      get(g:, 'loaded_taboo', 0) && exists("*TabooTabTitle")
+      title = call("TabooTabTitle", [n])
     endif
 
     if empty(title)
       title = gettabvar(n, 'title')
     endif
 
-    var formatter = get(g:, 'airline#extensions#tabline#tabtitle_formatter')
-    if empty(title) && formatter != '' && exists("*" .. formatter)
+    var formatter = get(g:, 'airline#extensions#tabline#tabtitle_formatter', '')
+    if empty(title) && !empty(formatter) && exists("*" .. formatter)
       title = call(formatter, [n])
     endif