digraphs: run vim parser with safety options

Preclude customisations and unneeded requirements to avoid possible
side-effects.  Options copied from Text::VimColor interface.

diff --git a/tools/mkdigraphs-vim b/tools/mkdigraphs-vim
index c1dcbe44e45ae09620f9a11262d587a700a33c6c..2137889aaceebe8fbd50ec411cac4e42ffbbce4d 100755 (executable)
--- a/tools/mkdigraphs-vim
+++ b/tools/mkdigraphs-vim
@@ -9,7 +9,9 @@ then
        exit 64 # EX_USAGE
 fi
 
-vim -e -c'echo version' -cdigraphs -cq | perl -CSD -nE '
+VIM='vim -RXZ -i NONE -u NONE -N -n'
+
+$VIM -e -c'echo version' -cdigraphs -cq | perl -CSD -nE '
        if ($. == 1) { # head
                say "# digraphs list from vim version ", m/(\d+)\s*\z/;
                say "+{";