# HG changeset patch
# User Mark Woods <mwoods.online.ie@gmail.com>
# Date 1659547376 -3600
# Node ID 8ddbcbfa57b2440d107e8f41be45448215986058
# Parent  b094a03a8115a9f512d4562518ffe774735ef8e9
Re-create wildignore options file if missing

When the wildignore options file is a temp file it can be deleted by
other processes which clean up temp files, so check the file is readable
and re-create if necessary before adding it to the list of files from
which to read exclusion patterns (-x option for update_tags scripts).

Without this Gutentags sometimes gets stuck in a rut reporting ctags job
failed, probably because I use both GUI vim and terminal vim, but might
not use the GUI for days and when I return to it the temp file is gone.

diff -r b094a03a8115 -r 8ddbcbfa57b2 autoload/gutentags/ctags.vim
--- a/autoload/gutentags/ctags.vim	Wed Jul 13 08:56:24 2022 +0800
+++ b/autoload/gutentags/ctags.vim	Wed Aug 03 18:22:56 2022 +0100
@@ -247,9 +247,14 @@
 
 function! s:generate_wildignore_options() abort
     if s:last_wildignores == &wildignore
-        " The 'wildignore' setting didn't change since last time we did this.
-        call gutentags#trace("Wildignore options file is up to date.")
-        return
+        " The 'wildignore' setting didn't change since last time we did this,
+        " but check if file still exist (could have been deleted if temp file)
+        if filereadable(s:wildignores_options_path)
+            call gutentags#trace("Wildignore options file is up to date.")
+            return
+        else
+            call gutentags#trace("Wildignore options file is not readable.")
+        endif
     endif
 
     if s:wildignores_options_path == ''