Repeatedly try to take a screenshot until we get an acceptable one.

dcc/ss.py

@@ -1,16 +1,36 @@
+from tkinter import messagebox
 import dcc.config
 import dcc.doom_base
+import sys
+import wand.display
 import wand.image
 
 class SS(dcc.doom_base.WadMap):
 	def get_parser(self, prog_name):
 		parser = super().get_parser(prog_name)
 		parser.add_argument("-g", "--gravity", default="center")
+		parser.add_argument("-y", "--yolo", action="store_true")
 		return parser
 
 	def take_action(self, parsed_args):
-		with wand.image.Image(width=THUMB_WIDTH, height=THUMB_HEIGHT, pseudo="x:") as img:
-			img.reset_coords()
-			img.crop(width=THUMB_WIDTH,height=THUMB_HEIGHT,gravity="center")
-			img.reset_coords()
-			img.save(filename=dcc.config.BaseThumbPath(parsed_args.wad, parsed_args.map))	
+		def try_screenshot():
+			with wand.image.Image(width=dcc.config.THUMB_WIDTH, height=dcc.config.THUMB_HEIGHT, pseudo="x:") as img:
+				img.reset_coords()
+				if img.size[0] < dcc.config.THUMB_WIDTH or img.size[1] < dcc.config.THUMB_HEIGHT:
+					if not messagebox.askretrycancel(title="DCC", message="Image too small.  Try again?"):
+						sys.exit("Gave up trying to select an image.")
+					return False
+				img.crop(width=dcc.config.THUMB_WIDTH,height=dcc.config.THUMB_HEIGHT,gravity=parsed_args.gravity)
+				img.reset_coords()
+				if not parsed_args.yolo:
+					wand.display.display(img)
+					accepted = messagebox.askyesnocancel(title="DCC", message="Is this image acceptable?")
+					if accepted is None:
+						sys.exit("Gave up on image verification")
+					if not accepted:
+						return False
+				img.save(filename=dcc.config.BaseThumbPath(parsed_args.wad, parsed_args.map))	
+				return True
+
+		while not try_screenshot():
+			pass