chore: make webfs usable

src/program/Mkdir.ts

@@ -8,12 +8,20 @@ export class Mkdir extends Program {
     }
 
     async Exec(_: SimpleStream<string>, stdout: SimpleStream<string>, workdir: Item, args: string[]): Promise<number> {
-        const item = await Item.openDir(args[1])
+        if (args.length < 2) {
+            stdout.emit("mkdir: error: missing path argument\n")
+            return 1
+        }
+
+        const item = await Item.openDir(args[1].startsWith('/')
+                ? args[1]
+                : `${workdir.GetPath()}${workdir.GetPath().endsWith('/') ? '' : '/'}${args[1]}`)
+
         stdout.emit(`does ${args[1]} exist? ${await item.Exists()}\n`)
 
         if (await item.Exists()) {
             stdout.emit(`mkdir: directory ${item.GetPath()} already exists.\n`)
-            return 1
+            return 2
         }
 
         item.Create()