database: switching from mysql to sqlite

Currently we only need the db to keep track of the files that were
already downloaded, thus we only use one database and only one table.
A complete sql database is a bit too bulky for this purpose.
By using sqlite we can minimize and embed the db.

src/run.py

@@ -6,7 +6,7 @@ import logging as log
 
 from studip import Studip
 from crawler import Crawler
-from mysql import Database
+from database import Database
 
 
 parser = argparse.ArgumentParser(description='Download Files from StudIP.')
@@ -21,14 +21,6 @@ parser.add_argument('--chunk', type=int, default=1024 *
                     1024, help='chunksize for downloading data')
 parser.add_argument('-r', '--reset_dl_date', action='store_true',
                     help='downloads everything and ignores last download date')
-parser.add_argument('--host', type=str, default='localhost', help='mysql host')
-parser.add_argument('--port', type=int, default=3306, help='mysql port')
-parser.add_argument('--db_name', type=str, default='studip',
-                    help='mysql database name')
-parser.add_argument('--db_user', type=str, default='root',
-                    help='mysql database user')
-parser.add_argument('--db_passwd', type=str,
-                    default='secret-pw', help='mysql database password')
 parser.add_argument('-d', '--debug_output', action='store_true',
                     help='display debug information about the process')
 parser.add_argument('-q', '--quiet', action='store_true',
@@ -53,8 +45,7 @@ BASE_DIR = os.path.abspath(args.output)
 USERNAME = args.user
 PASSWORD = args.passwd
 
-db = Database(args.host, args.port, args.db_name,
-              args.db_user, args.db_passwd, args.reset_dl_date)
+db = Database(args.reset_dl_date)
 
 studip = Studip(args.chunk, args.url, (USERNAME, PASSWORD), db)