From 2010892d9b0a37d739a417165406c40782f5bf60 Mon Sep 17 00:00:00 2001
From: Rafael Kitover <rkitover@gmail.com>
Date: Sat, 30 Jan 2016 07:54:45 -0500
Subject: [PATCH] support -conceal in vimcat #134

Check if the value returned by synconcealed is empty because the conceal
feature is not abled, and set it to [0] in this case.
---
 vimcat | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vimcat b/vimcat
index 3d3162e..237a002 100755
--- a/vimcat
+++ b/vimcat
@@ -385,6 +385,10 @@ function! AnsiHighlight(output_file)
 
       let concealed = synconcealed(lnum, cnum)
 
+      if empty(concealed) " no conceal feature
+        let concealed = [0]
+      endif
+
       if concealed[0] !=# 1 && synIDtrans(synID(lnum, cnum, 1)) != last
         let last = synIDtrans(synID(lnum, cnum, 1))
         let output .= s:GroupToAnsi(last)