Improve error message for malformed files

This patch makes Dotbot warn the user and gracefully exit when the
configuration file is not a list.

1 files changed, 2 insertions, 0 deletions

diff --git a/dotbot/cli.py b/dotbot/cli.py
index fffc017..dc90909 100644
--- a/dotbot/cli.py
+++ b/dotbot/cli.py
@@ -35,6 +35,8 @@ def main():
         if (options.verbose):
             log.set_level(Level.DEBUG)
         tasks = read_config(options.config_file[0])
+        if not isinstance(tasks, list):
+            raise ReadingError('Configuration file must be a list of tasks')
         dispatcher = Dispatcher(options.base_directory[0])
         success = dispatcher.dispatch(tasks)
         if success: