1 files changed, 50 insertions, 0 deletions
diff --git a/appl/cmd/limbo/arg.m b/appl/cmd/limbo/arg.m
new file mode 100644
index 00000000..212752c1
--- /dev/null
+++ b/appl/cmd/limbo/arg.m
@@ -0,0 +1,50 @@
+Arg: adt
+{
+	argv:	list of string;
+	c:	int;
+	opts:	string;
+
+	init:	fn(argv: list of string): ref Arg;
+	opt:	fn(arg: self ref Arg): int;
+	arg:	fn(arg: self ref Arg): string;
+};
+
+Arg.init(argv: list of string): ref Arg
+{
+	if(argv != nil)
+		argv = tl argv;
+	return ref Arg(argv, 0, nil);
+}
+
+Arg.opt(arg: self ref Arg): int
+{
+	if(arg.opts != ""){
+		arg.c = arg.opts[0];
+		arg.opts = arg.opts[1:];
+		return arg.c;
+	}
+	if(arg.argv == nil)
+		return arg.c = 0;
+	arg.opts = hd arg.argv;
+	if(len arg.opts < 2 || arg.opts[0] != '-')
+		return arg.c = 0;
+	arg.argv = tl arg.argv;
+	if(arg.opts == "--")
+		return arg.c = 0;
+	arg.c = arg.opts[1];
+	arg.opts = arg.opts[2:];
+	return arg.c;
+}
+
+Arg.arg(arg: self ref Arg): string
+{
+	s := arg.opts;
+	arg.opts = "";
+	if(s != "")
+		return s;
+	if(arg.argv == nil)
+		return "";
+	s = hd arg.argv;
+	arg.argv = tl arg.argv;
+	return s;
+}