1 files changed, 11 insertions, 1 deletions

diff --git a/scripts/metadata_filter.lua b/scripts/metadata_filter.lua
index b16ab92..413ded5 100644
--- a/scripts/metadata_filter.lua
+++ b/scripts/metadata_filter.lua
@@ -19,6 +19,15 @@ function pandoc.List:take(n)
     return result
 end
 
+function file_exists(name)
+    local f = io.open(name, "r")
+    if f ~= nil then
+        io.close(f)
+        return true
+    end
+    return false
+end
+
 function format_date(date)
     if not date then return date end
 
@@ -297,7 +306,8 @@ function process(global, meta)
     end
 
     if meta.thumbnail then
-        meta.thumbnail = make_absolute(pandoc.utils.stringify(meta.thumbnail), meta.file_out)
+        meta.thumbnail = make_absolute("thumbnail." .. pandoc.utils.stringify(meta.thumbnail),
+            meta.file_out)
         meta.thumbnail = resolve_url(global.site.url, global.file_out, meta.thumbnail)
     end