Move some scripts to new "system" dir, add argument parser

1 files changed, 112 insertions, 0 deletions

diff --git a/client/system/cli.gd b/client/system/cli.gd
new file mode 100644
index 00000000..b6ba8eef
--- /dev/null
+++ b/client/system/cli.gd
@@ -0,0 +1,112 @@
+# Hurry Curry! - a game about cooking
+# Copyright (C) 2025 Hurry Curry! contributors
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, version 3 of the License only.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+extends Node
+class_name Cli
+
+enum Mode { FLAG, OPTION, MULTI_OPTION, POSITIONAL }
+class Option:
+	var short #: String?
+	var long: String
+	var mode: Mode
+	var help: String
+	func _init(s, l: String, m: Mode, h: String):
+		short = s; long = l; mode = m; help = h
+
+static var OPTIONS := [
+	Option.new("h", "help", Mode.FLAG, "Show help"),
+	Option.new("s", "setting", Mode.MULTI_OPTION, "Per-launch setting override"),
+	Option.new(null, "connect_address", Mode.POSITIONAL, "Connect to a server directly without menu interaction")
+]
+
+static var opts = {} #: Dictionary[String, Variant]
+
+static func init() -> bool:
+	if not parse(): return false
+	if opts.has("help"):
+		print_help()
+		return false
+	return true
+
+static func print_help():
+	print("OPTIONS:\n")
+	for opt in OPTIONS:
+		var line = ""
+		if opt.mode == Mode.POSITIONAL:
+			line += "<" + opt.long.to_upper() + ">"
+		else:
+			if opt.short: line += "-" + opt.short + ", "
+			line += "--" + opt.long
+			if opt.mode == Mode.OPTION or opt.mode == Mode.MULTI_OPTION:
+				line += " <VALUE>"
+		while line.length() < 25: line += " "
+		line += " " + opt.help
+		print(line)
+
+static func parse() -> bool:
+	var args := OS.get_cmdline_user_args()
+	while not args.is_empty():
+		var arg := args[0]
+		args.remove_at(0)
+		if arg.begins_with("--"):
+			var long = arg.trim_prefix("--")
+			var opt_index = OPTIONS.find_custom(func(x): return x.long == long)
+			if opt_index == -1:
+				push_error("unknown long option \"%s\"" % long)
+				return false
+			if not _parse_opt(args, OPTIONS[opt_index]): return false
+		elif arg.begins_with("-"):
+			for short in arg.trim_prefix("-"):
+				var opt_index = OPTIONS.find_custom(func(x): return x.short == short)
+				if opt_index == -1:
+					push_error("unknown short option \"%s\"" % short)
+					return false
+				if not _parse_opt(args, OPTIONS[opt_index]): return false
+		else:
+			var opt_index = OPTIONS.find_custom(func(x): return x.mode == Mode.POSITIONAL)
+			if opt_index == -1:
+				push_error("no positional arguments")
+				return false
+			var opt = OPTIONS[opt_index]
+			opts[opt.long] = arg
+
+	print("Parsed options: ", opts)
+	return true
+
+static func _parse_opt(args: Array[String], opt: Option) -> bool:
+	match opt.mode:
+		Mode.FLAG:
+			opts[opt.long] = true
+			return true
+		Mode.OPTION:
+			if args.is_empty():
+				push_error("missing option value")
+				return false
+			opts[opt.long] = args[0]
+			args.remove_at(0)
+			return true
+		Mode.MULTI_OPTION:
+			if args.is_empty():
+				push_error("missing option value")
+				return false
+			if not opts.has(opt.long): opts[opt.long] = []
+			opts[opt.long].push_back(args[0])
+			args.remove_at(0)
+			return true
+		Mode.POSITIONAL:
+			push_error("positional arg doesnt need flag")
+			return false
+	push_error("unreachable")
+	return false