fix(flags, command): single dash not supported in arguments (#100)

command/test/command/arguments_test.ts

@@ -15,6 +15,13 @@ function cmd() {
     .arguments("[foo:string] [bar:number] [baz:boolean] [color:color]");
 }
 
+Deno.test("'-' as argument", async () => {
+  const { args } = await new Command()
+    .arguments("<input:string>")
+    .parse(["-"]);
+  assertEquals(args, ["-"]);
+});
+
 Deno.test("valid command argument types", async () => {
   const { args } = await cmd().parse(["abc", "123", "true", "red"]);
   assertEquals(args, ["abc", 123, true]);

flags/normalize.ts

@@ -13,7 +13,7 @@ export function normalize(args: string[]) {
     } else if (arg === "--") {
       inLiteral = true;
       normalized.push(arg);
-    } else if (arg[0] === "-") {
+    } else if (arg.length > 1 && arg[0] === "-") {
       const isLong = arg[1] === "-";
 
       if (arg.includes("=")) {

flags/test/option/unknown_test.ts

@@ -0,0 +1,21 @@
+import { assertEquals } from "../../../dev_deps.ts";
+import { parseFlags } from "../../flags.ts";
+import type { IParseOptions } from "../../types.ts";
+
+const options = <IParseOptions> {
+  flags: [{
+    name: "flag",
+    aliases: ["f"],
+  }],
+};
+
+Deno.test("unknown flags", () => {
+  const { flags, unknown, literal } = parseFlags(
+    ["-f", "foo", "-", "--", "bar"],
+    options,
+  );
+
+  assertEquals(flags, { flag: true });
+  assertEquals(unknown, ["foo", "-"]);
+  assertEquals(literal, ["bar"]);
+});