Fix empty XDG_* environment variables.

Use fallback, if an enviroment variable is unset *or* empty.

Bug:
- XDG_CONFIG_HOME='' alot

Problem:
Does not find the configuration file (among others), because
os.environ.get('XDG_CONFIG_HOME', '~/.config') returns '', instead of
'~/.config'.

1 files changed, 6 insertions, 0 deletions

diff --git a/alot/helper.py b/alot/helper.py
index be5191d8..06362e06 100644
--- a/alot/helper.py
+++ b/alot/helper.py
@@ -625,3 +625,9 @@ def email_as_string(mail):
                            as_string, flags=re.MULTILINE)
 
     return as_string
+
+
+def get_env(env_name, fallback):
+    """ Gets environment variable and returns fallback if unset or empty """
+    env = os.environ.get(env_name)
+    return env if env else fallback