Use shell=True in subprocess arguments to allow Lilypond to be on $PA…

…THs with a ~

sebastian/core/elements.py

@@ -101,10 +101,14 @@ def display(self, format="png"):
         basename = f.name[:-len(suffix)]
         args.extend(["-o"+basename, "-"])
 
-        p = sp.Popen(args, stdin=sp.PIPE)
-        p.communicate(write_lilypond.output(seq))
+        #Pass shell=True so that if your $PATH contains ~ it will
+        #get expanded. This also changes the way the arguments get
+        #passed in. To work correctly, pass them as a string
+        p = sp.Popen(" ".join(args), stdin=sp.PIPE, shell=True)
+        stdout, stderr = p.communicate(write_lilypond.output(seq))
         if p.returncode != 0:
             # there was an error
+            #raise IOError("Lilypond execution failed: %s%s" % (stdout, stderr))
             return None
 
         if not ipython: