From c7b140a24d756b675feee0e7e0a66f2d440c8c67 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grantsanderson7@gmail.com>
Date: Sun, 21 Jan 2018 23:31:46 -0800
Subject: [PATCH] Added error message to indicate people should change
 MEDIA_DIR

---
 constants.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/constants.py b/constants.py
index 6efe1a1d..496fcbc1 100644
--- a/constants.py
+++ b/constants.py
@@ -79,6 +79,12 @@ TEX_IMAGE_DIR     = TEX_DIR #TODO, What is this doing?
 MOBJECT_DIR       = os.path.join(FILE_DIR, "mobjects")
 IMAGE_MOBJECT_DIR = os.path.join(MOBJECT_DIR, "image")
 
+if not os.path.exists(MEDIA_DIR):
+    raise Exception("""
+        Redefine MEDIA_DIR in constants.py to point to 
+        a valid directory where movies and images will 
+        be written
+    """)
 for folder in [FILE_DIR, RASTER_IMAGE_DIR, SVG_IMAGE_DIR, ANIMATIONS_DIR, TEX_DIR,
                TEX_IMAGE_DIR, MOBJECT_DIR, IMAGE_MOBJECT_DIR,
                STAGED_SCENES_DIR]: