Add support for rendering in the background.

dcc/fabricate.py

@@ -1,14 +1,23 @@
 import contextlib
 import dcc.config
 import dcc.doom_base
+import shutil
 import subprocess
 import tempfile
 
 class Fabricate(dcc.doom_base.WadMap):
+	def get_parser(self, prog_name):
+		parser = super().get_parser(prog_name)
+		parser.add_argument("--fg", action="store_true")
+		return parser
+
 	def take_action(self, parsed_args):
 		with tempfile.TemporaryDirectory() as td:
 			with contextlib.chdir(td):
-				subprocess.run([dcc.config.DSDA] +
+				command = [dcc.config.DSDA]
+				if not parsed_args.fg and shutil.which("xvfb-run") is not None:
+					command = ["xvfb-run"] + command
+				subprocess.run(command +
 					dcc.config.DsdaPreamble(parsed_args.wad, parsed_args.map) +
 					["-timedemo", dcc.config.DemoInPath(parsed_args.wad, parsed_args.map)] +
 					["-viddump", dcc.config.VideoPath(parsed_args.wad, parsed_args.map)])