fix command-line REPL (#1674)

* make repl index runnable

* fix repl parsing of chapters

* fix output of repl

src/repl/index.ts

@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 import { Command } from '@commander-js/extra-typings'
 
 import { getReplCommand } from './repl'

src/repl/transpiler.ts

@@ -18,7 +18,7 @@ import {
   validateChapterAndVariantCombo
 } from './utils'
 
-export const transpilerCommand = new Command()
+export const transpilerCommand = new Command('transpiler')
   .addOption(
     getVariantOption(Variant.DEFAULT, [Variant.DEFAULT, Variant.GPU, Variant.LAZY, Variant.NATIVE])
   )

src/repl/utils.ts

@@ -9,7 +9,7 @@ import { parseError, type Context } from '..'
 export function chapterParser(str: string): Chapter {
   let foundChapter: string | undefined
 
-  if (/^[0-9]$/.test(str)) {
+  if (/^-?[0-9]+$/.test(str)) {
     // Chapter is fully numeric
     const value = parseInt(str)
     foundChapter = Object.keys(Chapter).find(chapterName => Chapter[chapterName] === value)
@@ -66,13 +66,14 @@ export function validChapterVariant(language: Language) {
 
 export function handleResult(result: Result, context: Context, verboseErrors: boolean) {
   if (result.status === 'finished' || result.status === 'suspended-non-det') {
-    if (
-      result instanceof Closure ||
-      typeof result === 'function' ||
-      result.representation !== undefined
-    ) {
-      return result.toString()
+    if (result.representation !== undefined) {
+      return result.representation
     }
+
+    if (result.value instanceof Closure || typeof result.value === 'function') {
+      return result.value.toString()
+    }
+
     return stringify(result.value)
   }