argparser: add argparser and nice print

args.py

@@ -0,0 +1,30 @@
+"""
+Parse commandline arguments and provide global variables for settings.
+"""
+
+import argparse
+
+
+class Settings():
+    file = None
+    sort = "time"
+    debug = False
+
+    def __init__(self):
+        parser = argparse.ArgumentParser(description='IHK Dijkstra Projekt.')
+        parser.add_argument('file', help='The input file.')
+        parser.add_argument(
+                '-sort',
+                default='time',
+                help='Whether to sort after "time" or "co2"')
+        parser.add_argument(
+                '-debug',
+                action='store_true',
+                help='Show debug output.')
+        args = parser.parse_args()
+        assert(args.sort == "time" or args.sort == "co2")
+
+        # update default values
+        self.file = args.file
+        self.debug = args.debug
+        self.sort = args.sort