From 4cbb8d8e93958a998a49e42d0b49f19014761030 Mon Sep 17 00:00:00 2001
From: Albert Krewinkel <albert@zeitkraut.de>
Date: Thu, 11 Jul 2024 16:55:14 +0200
Subject: [PATCH] include-files: use pandoc's warn function if possible

Fixes: #281
---
 include-files/include-files.lua | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include-files/include-files.lua b/include-files/include-files.lua
index f9f208e9..2499968c 100644
--- a/include-files/include-files.lua
+++ b/include-files/include-files.lua
@@ -10,6 +10,11 @@ local List = require 'pandoc.List'
 local path = require 'pandoc.path'
 local system = require 'pandoc.system'
 
+local warn = pcall(require, 'pandoc.log')
+  and (require 'pandoc.log').warn
+  or warn
+  or function (msg) io.stderr:write(msg .. '\n') end
+
 --- Get include auto mode
 local include_auto = false
 function get_vars (meta)
@@ -85,7 +90,7 @@ function transclude (cb)
     if line:sub(1,2) ~= '//' then
       local fh = io.open(line)
       if not fh then
-        io.stderr:write("Cannot open file " .. line .. " | Skipping includes\n")
+        warn("Cannot open file " .. line .. " | Skipping includes")
       else
         -- read file as the given format with global reader options
         local contents = pandoc.read(