Add a zstyle to set the syntax highlighter

modules/syntax-highlighting/init.zsh

@@ -7,6 +7,11 @@
 
 if zstyle -t ':omz:module:syntax-highlighting' color; then
   source "${0:h}/external/zsh-syntax-highlighting.zsh"
-  ZSH_HIGHLIGHT_HIGHLIGHTERS=(main brackets pattern cursor)
+
+  # Set the highlighters.
+  zstyle -a ':omz:module:syntax-highlighting' highlighters 'ZSH_HIGHLIGHT_HIGHLIGHTERS'
+  if (( ${#ZSH_HIGHLIGHT_HIGHLIGHTERS[@]} == 0 )); then
+    ZSH_HIGHLIGHT_HIGHLIGHTERS=(main brackets cursor)
+  fi
 fi