[SSG] Isolate argument parsing.

nova.py

@@ -94,13 +94,13 @@ class EpisodeList(UserList):
 
 class Episode:
     "Represents one episode of podcast"
-    def __init__(self, date, slug, title, show_notes, video_src, audo_src):
+    def __init__(self, date, slug, title, show_notes, video_src, audio_src):
         self.date = date
         self.slug = slug
         self.title = title.strip()
         self.show_notes = markdown.markdown(show_notes)
         self.video = video_src
-        self.audio = audo_src
+        self.audio = audio_src
 
     def render(self, template, thumbnail_src):
         "Renders the Episode with the given template"
@@ -118,15 +118,21 @@ class Episode:
         subprocess.run(args, check=False)
 
 
-def main():
-    "Main method"
-    root = path.dirname(sys.argv[0]).rstrip("/") + "/"
+def parse_args():
+    "Parses arguments"
     parser = argparse.ArgumentParser()
     parser.add_argument("input_dir", help="Input directory")
     parser.add_argument("output_dir", help="Output directory")
     args = parser.parse_args()
     input_dir = args.input_dir.rstrip("/") + "/"
     output_dir = args.output_dir.rstrip("/") + "/"
+    return input_dir, output_dir
+
+
+def main():
+    "Main method"
+    root = path.dirname(sys.argv[0]).rstrip("/") + "/"
+    input_dir, output_dir = parse_args()
 
     # Input validation
     paths = [
@@ -139,8 +145,8 @@ def main():
         print("Invalid Input", file=sys.stderr)
         return
 
-    if not path.isdir(args.output_dir):
-        os.mkdir(args.output_dir)
+    if not path.isdir(output_dir):
+        os.mkdir(output_dir)
 
     env = jinja2.Environment(
         loader=jinja2.FileSystemLoader(root),