feat: add some utilities

src/program/Loadprg.ts

@@ -0,0 +1,29 @@
+import type { Wush } from '../shell/Wush'
+import type { SimpleStream } from '../utils/SimpleStream'
+import { Program } from './Program'
+
+export class Loadprg extends Program {
+    // private wush: Wush
+
+    constructor(_: Wush) {
+        super()
+        // this.wush = wush
+    }
+
+    async Exec(_: SimpleStream<string>, stdout: SimpleStream<string>, args: string[]): Promise<number> {
+        stdout.emit('Not implemented yet.\n')
+        return 0
+
+        const javascript = args.slice(1).join(' ')
+
+        try {
+            eval(javascript)
+        } catch (e) {
+            stdout.emit(`${String(e)}\n`)
+            stdout.emit(`${String((e as Error).stack)}\n`)
+            return 1
+        }
+
+        return 0
+    }
+}