transfer absolute path logic to own def

src/materials.py

@@ -24,11 +24,17 @@ EPILOG = """\
 """
 
 
+def absolute_path(filename):
+  """\
+  Get full path.
+  """
+  return os.path.join(os.path.abspath(os.path.dirname(__file__)), filename)
+
+
 def read_dir(directory, exclude=None):
   """\
   Read all files in directory as list
   """
-  directory = os.path.join(os.path.abspath(os.path.dirname(__file__)), directory)
   result = []
   for data in os.listdir(directory):
     file_name = data.split('.')[0]
@@ -49,7 +55,6 @@ def read_file(filename):
   """\
   Read file as string
   """
-  filename = os.path.join(os.path.abspath(os.path.dirname(__file__)), filename)
   try:
     with open(filename) as data_file:
       return data_file.read()
@@ -147,12 +152,12 @@ def main():
     print(args)
 
   if args.command == 'list':
-    data_list = read_dir("data", "INFO")
+    data_list = read_dir(absolute_path("data"), "INFO")
     print_list(data_list)
 
   elif args.command == 'get':
     filename = os.path.join('data', args.materialname.lower() + '.json')
-    data = read_file(filename)
+    data = read_file(absolute_path(filename))
     if args.debug:
       print("filename: " + filename)
     if args.const_collection: