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, 3 insertions, 3 deletions

diff --git a/alot/__main__.py b/alot/__main__.py
index ee5e442a..207c8b92 100644
--- a/alot/__main__.py
+++ b/alot/__main__.py
@@ -11,6 +11,7 @@ import sys
 import alot
 from alot.settings.const import settings
 from alot.settings.errors import ConfigError
+from alot.helper import get_env
 from alot.db.manager import DBManager
 from alot.ui import UI
 from alot.commands import *
@@ -92,9 +93,8 @@ def main():
 
     # locate alot config files
     if options.config is None:
-        alotconfig = os.path.join(
-            os.environ.get('XDG_CONFIG_HOME', os.path.expanduser('~/.config')),
-            'alot', 'config')
+        xdg_dir = get_env('XDG_CONFIG_HOME', os.path.expanduser('~/.config'))
+        alotconfig = os.path.join(xdg_dir, 'alot', 'config')
         if os.path.exists(alotconfig):
             settings.alot_rc_path = alotconfig
     else: