scripts/shopping

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+#!/usr/bin/env python3
+
+# record shopping list items
+
+from sys import argv, exit
+
+list_file = "wishlist.txt"
+
+
+## utilities
+
+def die(msg: str):
+	print(msg)
+	exit(1)
+
+def fetch_list() -> list:
+	try:
+		with open(list_file, 'r') as f:
+			return list(map(lambda item: item.strip(), f.readlines()))
+	except:
+		die("wuh oh, i can't open the shopping list file!")
+
+def save_list(the_list: list):
+	try:
+		with open(list_file, 'w') as f:
+			f.write("\n".join(the_list))
+	except:
+		die("oh noes! the shopping list couldn't be saved!")
+
+
+## shopping list management
+
+def add(item: str):
+	if len(item) == 0:
+		die("what do u want to add?")
+	the_list = fetch_list()
+	the_list.append(item)
+	save_list(the_list)
+	print(f"#{len(the_list)-1}: \"{item}\" added!")
+
+def remove(index: int):
+	the_list = fetch_list()
+	if index < 0 or index >= len(the_list):
+		die("that item does not exist!")
+	new_list = filter(lambda item: item != the_list[index], the_list)
+	save_list(new_list)
+	print(f"#{index} removed!")
+
+def show():
+	the_list = fetch_list()
+	for i,item in enumerate(the_list):
+		print(f"{i}: {item}")
+	exit(42)
+
+def usage():
+	print("!neko shopping <command> <args>")
+	print("commands:")
+	print("  add <item>       add an item")
+	print("  remove <number>  remove an item")
+	print("  show             show the list")
+	exit(42)
+
+
+## entry point
+if __name__ == '__main__':
+	cmd = arg = ""
+	try:
+		cmd, arg = argv[1].split(' ', 1)
+	except:
+		cmd = argv[1]
+
+	match cmd:
+		case "add":    add(arg)
+		case "remove": remove(int(arg))
+		case "show":   show()
+		case _:        usage()