Fix brandon-rhodes#4: Protect against empty path with abspath()

Author: brandon-rhodes

build/BUILD.py

@@ -9,7 +9,7 @@
 split_on_tabs = re.compile(b'\t+').split
 
 def main():
-    os.chdir(os.path.dirname(__file__))
+    os.chdir(os.path.dirname(os.path.abspath(__file__)))
     if not os.path.isdir('../data'):
         os.makedirs('../data')
 

build/split.py

@@ -27,7 +27,7 @@ def question_cell(text):
 
 def main():
     session_cells = {n: [] for n in range(1, 6+1)}
-    f = open(os.path.dirname(__file__) + '/../All.ipynb')
+    f = open(os.path.dirname(os.path.abspath(__file__)) + '/../All.ipynb')
     j = json.load(f)
     cells = j['cells']
     for cell in cells: