chore: fix bugs & qol

src/program/Cp.ts

@@ -0,0 +1,59 @@
+import { Item } from '../fs/Item'
+import type { SimpleStream } from '../utils/SimpleStream'
+import { Program } from './Program'
+
+export class Cp extends Program {
+    constructor() {
+        super()
+    }
+
+    async Exec(_: SimpleStream<string>, stdout: SimpleStream<string>, workdir: Item, args: string[]): Promise<number> {
+        if (args.length < 3) {
+            stdout.emit("cp: error: missing the first and/or second path arguments\n")
+            return 1
+        }
+
+        let item1: Item
+        let item2: Item
+
+        let destIsDir = false
+
+        // figure out if the items are files or directories
+        try {
+            item1 = await Item.openDir(Item.NormalizePath(args[1].startsWith('/') ? args[1] : `${workdir.GetPath()}/${args[1]}`))
+        } catch {
+            item1 = await Item.open(Item.NormalizePath(args[1].startsWith('/') ? args[1] : `${workdir.GetPath()}/${args[1]}`))
+        }
+
+        try {
+            item2 = await Item.open(Item.NormalizePath(args[2].startsWith('/') ? args[2] : `${workdir.GetPath()}/${args[2]}`))
+        } catch {
+            item2 = await Item.openDir(Item.NormalizePath(args[2].startsWith('/') ? args[2] : `${workdir.GetPath()}/${args[2]}`))
+            destIsDir = true
+        }
+
+        if (!await item1.Exists()) {
+            stdout.emit(`cp: error: source item ${item1.GetPath()} does not exist.\n`)
+            return 2
+        }
+
+        if (await item2.Exists() && !destIsDir) {
+            stdout.emit(`cp: error: destination item ${item2.GetPath()} already exists.\n`)
+            return 2
+        }
+
+        // either copy the item into a destination directory or create a new copy
+        if (destIsDir) {
+            const destChild = await Item.open(Item.NormalizePath(`${item2.GetPath()}/${item1.GetName()}`))
+            await item1.Copy(destChild)
+            stdout.emit(`-> copied ${item1.GetPath()} -> ${destChild.GetPath()}\n`)
+        } else {
+            await item2.Create()
+            await item1.Copy(item2)
+
+            stdout.emit(`-> copied ${item1.GetPath()} -> ${item2.GetPath()}\n`)
+        }
+
+        return 0
+    }
+}