From bad42197d2e780d8aa64924f5df9e6b0a62ff5f6 Mon Sep 17 00:00:00 2001
From: Christopher Monsanto <chris@monsan.to>
Date: Wed, 16 Sep 2020 05:49:27 -0400
Subject: [PATCH] allow pngquant to overwrite file

---
 Tuprules.lua | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Tuprules.lua b/Tuprules.lua
index 4b8c12a0..1704dcd7 100644
--- a/Tuprules.lua
+++ b/Tuprules.lua
@@ -40,7 +40,8 @@ function compresspng(opts)
         compressopts(opts.config, copts)
     end
     if copts.pngquant then
-        cmds += rep{"pngquant ${opts} ${output}", opts=copts.pngquant, output=output}
+        -- -f -o necessary to overwrite existing file
+        cmds += rep{"pngquant -f -o ${output} ${opts} ${output}", opts=copts.pngquant, output=output}
     end
     if copts.optipng then
         cmds += rep{"optipng -q ${opts} ${output}", opts=copts.optipng, output=output}