update cli to be able to use stdin and stdout

ts/bin/razuberi

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+script="$(dirname "$0")"/../dist/cli/razuberi.js
+
+node $script "$@"

ts/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@razuberi/transpiler",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "A JavaScript/TypeScript -> C++ transpiler",
   "keywords": [
     "razuberi",
@@ -28,7 +28,7 @@
   ],
   "main": "dist/index.js",
   "bin": {
-    "razuberi": "./bin/razuberi.js"
+    "razuberi": "./bin/razuberi"
   },
   "repository": {
     "type": "git",

ts/src/cli/razuberi.ts

@@ -3,38 +3,55 @@ import * as path from 'node:path'
 
 import { ArgumentParser } from 'argparse'
 
+const usage = `razuberi [-h | --help]
+       razuberi --stdin [[-o | --out] <outputFile>]
+       razuberi <inputFile> [[-o | --out] <outputFile>]`
+
 const argParser = new ArgumentParser({
   description: 'Razuberi: a JavaScript -> TypeScript transpiler.',
-  prog: 'razuberi',
+  usage,
 })
 
-argParser.add_argument('inputFilename', {
-  help: 'a JavaScript/TypeScript file to transpile. only one <input> file is supported at this time.',
-  metavar: '<input>',
+const argGroup = argParser.add_mutually_exclusive_group({ required: true })
+
+argGroup.add_argument('inputFile', {
+  help: 'the input file to transpile. pass "--stdin" to read from `stdin`.',
+  metavar: '<inputFile>',
+  nargs: '?',
   type: (arg: string) => path.join(process.cwd(), arg),
 })
 
+argGroup.add_argument('--stdin', {
+  action: 'store_true',
+  help: 'read from stdin',
+})
+
 argParser.add_argument('-o', '--out', {
-  default: 'a.cpp',
-  dest: 'outputFilename',
-  help: 'write output C++ to <file>. defaults to `a.cpp`',
-  metavar: '<file>',
+  dest: 'outputFile',
+  help: 'write C++ output to this file. defaults to `stdout`.',
+  metavar: '<outputFile>',
+  nargs: '?',
   type: (arg: string) => path.join(process.cwd(), arg),
 })
 
-const {
-  inputFilename,
-  outputFilename,
-} = argParser.parse_args()
-
-const { readFile } = await import('node:fs/promises')
+const args = argParser.parse_args()
 
-const inputFileContents = await readFile(inputFilename, 'utf-8')
+let inputFileContents: string
+if (args.stdin) {
+  const { readFileSync } = await import('node:fs')
+  inputFileContents = readFileSync(process.stdin.fd, 'utf-8')
+} else {
+  const { readFile } = await import('node:fs/promises')
+  inputFileContents = await readFile(args.inputFile, 'utf-8')
+}
 
 const { transpile } = await import('../lib/transpile.js')
 
 const outputFileContents = transpile(inputFileContents)
 
-const { writeFile } = await import('node:fs/promises')
-
-await writeFile(outputFilename, outputFileContents)
+if (args.outputFile) {
+  const { writeFile } = await import('node:fs/promises')
+  await writeFile(args.outputFile, outputFileContents)
+} else {
+  process.stdout.write(outputFileContents)
+}

ts/test/run.sh

@@ -4,7 +4,7 @@ set -e
 cd "$(dirname "$0")"
 
 set -x
-../bin/razuberi.js $1.ts -o $1.cpp
+../bin/razuberi $1.ts -o $1.cpp
 indent $1.cpp
 g++ -c -I ../../cpp/out/include $1.cpp -o $1.o
 g++ -L ../../cpp/out/lib -l razuberi $1.o -o $1