From 0a9b347483ae653e95ed7ccb147a0db3644b6384 Mon Sep 17 00:00:00 2001
From: Daniel Shahaf <d.s@daniel.shahaf.name>
Date: Thu, 22 Sep 2016 04:10:28 +0000
Subject: [PATCH] driver: Warn just once when a highlighter is missing.

The heretofore code warned once per keypress.
---
 zsh-syntax-highlighting.zsh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/zsh-syntax-highlighting.zsh b/zsh-syntax-highlighting.zsh
index f9d82de..ec01306 100644
--- a/zsh-syntax-highlighting.zsh
+++ b/zsh-syntax-highlighting.zsh
@@ -92,7 +92,11 @@ _zsh_highlight()
       typeset -ga ${cache_place}
 
       # If highlighter needs to be invoked
-      if "_zsh_highlight_highlighter_${highlighter}_predicate"; then
+      if ! type "_zsh_highlight_highlighter_${highlighter}_predicate" >&/dev/null; then
+        echo "zsh-syntax-highlighting: warning: disabling the ${(qq)highlighter} highlighter as it has not been loaded" >&2
+        # TODO: use ${(b)} rather than ${(q)} if supported
+        ZSH_HIGHLIGHT_HIGHLIGHTERS=( ${ZSH_HIGHLIGHT_HIGHLIGHTERS:#${highlighter}} )
+      elif "_zsh_highlight_highlighter_${highlighter}_predicate"; then
 
         # save a copy, and cleanup region_highlight
         region_highlight_copy=("${region_highlight[@]}")