From 739317285efbb00cae3bb1c9a4c2eb8e71941650 Mon Sep 17 00:00:00 2001
From: Tobias Jakobs <tobias.jakobs@gmail.com>
Date: Fri, 26 Dec 2014 19:15:44 +0100
Subject: [PATCH] added checkIfBinExists

---
 contrib/slideshowMusic.lua | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/contrib/slideshowMusic.lua b/contrib/slideshowMusic.lua
index f5de473..a66c28a 100644
--- a/contrib/slideshowMusic.lua
+++ b/contrib/slideshowMusic.lua
@@ -27,12 +27,28 @@ USAGE
 local dt = require "darktable"
 dt.configuration.check_version(...,{2,0,2})
 
+local function checkIfBinExists(bin)
+  local handle = io.popen("which "..bin)
+  local result = handle:read()
+  local ret
+  handle:close()
+  if (not result) then
+    dt.print_error(bin.." not found")
+    ret = false
+  end
+  ret = true
+  return ret
+end
+
 local function playSlideshowMusic(_, old_view, new_view)
   local filename, playMusic
 
   filename = dt.preferences.read("slideshowMusic","SlideshowMusic","string")
   playMusic = dt.preferences.read("slideshowMusic","PlaySlideshowMusic","bool")
 
+  if not checkIfBinExists("rhythmbox-client") then
+    return
+  end
 
   if (playMusic) then
     local playCommand, stopCommand