From 480a818bf0ef6de32527ba14fc2bb27e754d0612 Mon Sep 17 00:00:00 2001
From: Fabien Fleutot <fleutot@gmail.com>
Date: Tue, 18 Jun 2013 11:01:46 +0200
Subject: support multiple filters in ltn12.{sink,source}.chain()

---
 src/ltn12.lua | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/ltn12.lua b/src/ltn12.lua
index 5b10f56..1014de2 100644
--- a/src/ltn12.lua
+++ b/src/ltn12.lua
@@ -139,7 +139,9 @@ function source.rewind(src)
     end
 end
 
-function source.chain(src, f)
+-- chains a source with one or several filter(s)
+function source.chain(src, f, ...)
+    if ... then f=filter.chain(f, ...) end
     base.assert(src and f)
     local last_in, last_out = "", ""
     local state = "feeding"
@@ -254,8 +256,13 @@ function sink.error(err)
     end
 end
 
--- chains a sink with a filter
-function sink.chain(f, snk)
+-- chains a sink with one or several filter(s)
+function sink.chain(f, snk, ...)
+    if ... then
+        local args = { f, snk, ... }
+        snk = table.remove(args, #args)
+        f = filter.chain(unpack(args))
+    end
     base.assert(f and snk)
     return function(chunk, err)
         if chunk ~= "" then
-- 
cgit v1.2.3-55-g6feb