Use argparse for tweaking stuff

Not tested thoroughly, but I can sort my users, so I'm happy.

triditko/__main__.py

@@ -4,6 +4,7 @@ from triditko.renderers import DrawItemNameRenderer
 from triditko.utils import align
 import json
 import importlib
+import argparse
 
 def get_base_surface(screen_size, categories) -> (pg.Surface, (int, int)):
 	"""Returns a surface template with legend, suitable as a basis for rendering the rest.
@@ -35,16 +36,47 @@ def main():
 	font = pgft.Font(None)
 
 	#TODO: use argparse and reasonable stuff
-	categories = ['good', 'bad', 'ugly']
-	bindings = {
-		pg.K_1: 'good',
-		pg.K_2: 'bad',
-		pg.K_3: 'ugly',
-		}
+	argp = argparse.ArgumentParser()
+	argp.add_argument('-c', '--categories',
+		action='store',
+		metavar='CATEGORIES',
+		default='S, A, B, C, D, F',
+		type=str,
+		help='categories to sort into (defaults to S,A,B,C,D,F)',
+		)
+	argp.add_argument('-r', '--renderer',
+		action='store',
+		type=str,
+		default='triditko.renderers:DrawItemNameRenderer',
+		help='alternative renderer for items',
+		)
+	argp.add_argument('-o', '--output',
+		action='store',
+		metavar='FILE',
+		type=str,
+		default='/dev/stdout',
+		help='output file (defaults to stdout)',
+		)
+	argp.add_argument('-i', '--input',
+		action='store',
+		metavar='FILE',
+		type=str,
+		required=False,
+		default='/dev/stdin',
+		help='file with items (defaults to stdin)',
+		)
+	args = argp.parse_args()
+	categories = [x.strip() for x in args.categories.split(',')]
+	with open(args.input, 'rt') as inputfile:
+		items = [line.strip() for line in inputfile if line.strip() != '']
+	# XXX: We won't need these for a long time…
+	renderer = args.renderer
+	outputfile = args.output
+	# TODO: customizable bindings!
+	if len(categories) > 10:
+		raise NotImplementedError('Too many categories, cannot automatically assign keybindings.')
+	bindings = {pg.key.key_code(str(key)): cat for key, cat in zip(range(1, 10+1), categories)}
 	escape_char = pg.K_ESCAPE
-	items = [f'item_{i}' for i in range(20)]
-	renderer = 'triditko.renderers:DrawItemNameRenderer'
-	outputfile = '/dev/stdout'
 
 	result = {k: [] for k in categories}