Add configuration file for the project

2 files changed, 12 insertions, 1 deletions

diff --git a/gn3/file_utils.py b/gn3/file_utils.py
index d6e1c66..a6929e1 100644
--- a/gn3/file_utils.py
+++ b/gn3/file_utils.py
@@ -5,6 +5,7 @@ import os
 
 from functools import partial
 from typing import Dict
+from gn3.settings import APP_DEFAULTS
 
 
 def get_dir_hash(directory: str) -> str:
@@ -30,7 +31,8 @@ ENVIRON_VAR/ROOT_DIR/FILE_NAME does not exist, raise an exception.
 Otherwise return ENVIRON_VAR/ROOT_DIR/FILE_NAME.
 
     """
-    _dir = os.environ.get(environ_var)
+    _dir = APP_DEFAULTS.get(environ_var,
+                            os.environ.get(environ_var))
     if _dir:
         _file = os.path.join(_dir, root_dir, file_name)
         if os.path.isfile(_file):
diff --git a/gn3/settings.py b/gn3/settings.py
new file mode 100644
index 0000000..d8d5986
--- /dev/null
+++ b/gn3/settings.py
@@ -0,0 +1,9 @@
+"""Configuration settings for this project"""
+
+import tempfile
+import os
+
+APP_DEFAULTS = {
+    "GEMMA_WRAPPER_CMD": os.environ.get("GEMMA_WRAPPER", "gemma-wrapper"),
+    "TMPDIR": os.environ.get("TMPDIR", tempfile.gettempdir())
+}