Add a fetch command; this could probably use some refinement.

dcc/fetch.py

@@ -0,0 +1,37 @@
+from cliff.command import Command
+import dcc.config
+import io
+import json
+import pathlib
+import urllib.request
+import zipfile
+
+class Fetch(Command):
+	def get_parser(self, prog_name):
+		parser = super().get_parser(prog_name)
+		parser.add_argument("id_or_name")
+		return parser
+	
+	def take_action(self, parsed_args):
+		idgames_id = parsed_args.id_or_name
+		if not parsed_args.id_or_name.isdigit():	
+			idgames_id = self.search_idgames(parsed_args.id_or_name)
+
+		with urllib.request.urlopen("https://www.doomworld.com/idgames/api/api.php?action=get&id={}&out=json".format(idgames_id)) as response:
+			reply = json.loads(response.read())
+			rpath = "/".join([dcc.config.MIRROR, reply["content"]["dir"], reply["content"]["filename"]])
+			wad = reply["content"]["filename"][0:-4]
+
+			with urllib.request.urlopen(rpath) as response:
+				z = zipfile.ZipFile(io.BytesIO(response.read()))
+				z.extractall(path=dcc.config.PwadPath(wad))
+
+	# TODO: explicit error handling.  Let users choose when >1 result.
+	def search_idgames(self, wad):
+		with urllib.request.urlopen("https://www.doomworld.com/idgames/api/api.php?action=search&query={}&out=json".format(wad)) as response:
+			reply = json.loads(response.read())
+			files =  reply["content"]["file"]
+			if type(files) is dict:  # One result.
+				return files["id"]
+			else:  # More than one.  Zero will raise an error.
+				return files[0]["id"]