From 31e01612f3b9eef79e6a71d4708b85505f50e255 Mon Sep 17 00:00:00 2001
From: Christian Brabandt <cb@256bit.org>
Date: Thu, 19 Jan 2023 21:46:36 +0100
Subject: [PATCH] tagbar: do not load, if file size is too large

closes: #2578
---
 autoload/airline/extensions/tagbar.vim | 4 ++++
 doc/airline.txt                        | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/autoload/airline/extensions/tagbar.vim b/autoload/airline/extensions/tagbar.vim
index 7e6b9df8..368fffc3 100644
--- a/autoload/airline/extensions/tagbar.vim
+++ b/autoload/airline/extensions/tagbar.vim
@@ -40,6 +40,10 @@ function! airline#extensions#tagbar#currenttag()
       unlet! a
       let s:init=1
     endif
+    let cursize = getfsize(fnamemodify(bufname('%'), ':p'))
+    if cursize > 0 && cursize > get(g:, 'airline#extensions#tagbar#max_filesize', 1024 * 1024)
+      return ''
+    endif
     let flags = get(g:, 'airline#extensions#tagbar#flags', '')
     " function tagbar#currenttag does not exist, if filetype is not enabled
     if s:airline_tagbar_last_lookup_time != localtime() && exists("*tagbar#currenttag")
diff --git a/doc/airline.txt b/doc/airline.txt
index f0068fe6..8cb21ecb 100644
--- a/doc/airline.txt
+++ b/doc/airline.txt
@@ -1468,6 +1468,10 @@ tagbar <https://github.com/majutsushi/tagbar>
   let g:airline#extensions#tagbar#searchmethod = 'nearest-stl' (default)
   let g:airline#extensions#tagbar#searchmethod = 'nearest'
   let g:airline#extensions#tagbar#searchmethod = 'scoped-stl'
+
+* configure max filesize, after which to skip loading the extension
+  If the file is larger, tags won't be displayed for performance reasons >
+  let g:airline#extensions#tagbar#max_filesize = 1024*1024 (default)
 <
 -------------------------------------                       *airline-taglist*
 taglist <https://github.com/yegappan/taglist>