Add extention to support yegappan/taglist

autoload/airline/extensions/taglist.vim

@@ -0,0 +1,29 @@
+" MIT License. Copyright (c) 2021       DEMAREST Maxime (maxime@indelog.fr)
+" Plugin: https://github.com/yegappan/taglist/
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':TlistShowTag')
+  finish
+endif
+
+function! airline#extensions#taglist#currenttag()
+  " Update tag list if taglist is not loaded (else we get an empty tag name)
+  let tlist_updated = v:false
+  if !exists('*Tlist_Get_Filenames()')
+      TlistUpdate
+      let tlist_updated = v:true
+  endif
+  if !tlist_updated
+      if stridx(Tlist_Get_Filenames(), expand('%:p')) < 0
+          TlistUpdate
+          let tlist_updated = v:true
+      endif
+  endif
+  return taglist#Tlist_Get_Tagname_By_Line()
+endfunction
+
+function! airline#extensions#taglist#init(ext)
+  call airline#parts#define_function('taglist', 'airline#extensions#taglist#currenttag')
+endfunction