reverse cli command

cli.ts

@@ -0,0 +1,77 @@
+#!/usr/bin/env node
+import { reverseDir } from "./reverse"
+
+function printHelp() {
+  console.log(`tdir
+
+Usage:
+  tdir reverse <rendered-dir> <template-dir> [--map <path>]
+
+Commands:
+  reverse   Rebuild template files from a rendered directory and reverse map
+
+Options:
+  --map     Reverse map path. Defaults to <rendered-dir>/.tdir-map.json.
+            Relative paths are resolved from <rendered-dir>.
+  --help    Show this help message.
+`)
+}
+
+function parseReverseArgs(args: string[]) {
+  const positional: string[] = []
+  let mapPath: string | undefined
+
+  for (let i = 0; i < args.length; i++) {
+    const arg = args[i]!
+    if (arg === "--help" || arg === "-h") {
+      return { help: true, positional, mapPath }
+    }
+    if (arg === "--map") {
+      const value = args[++i]
+      if (!value) throw new Error("Missing value for --map")
+      mapPath = value
+      continue
+    }
+    positional.push(arg)
+  }
+
+  return { help: false, positional, mapPath }
+}
+
+function main(argv: string[]) {
+  const [command, ...args] = argv
+
+  if (!command || command === "--help" || command === "-h") {
+    printHelp()
+    return 0
+  }
+
+  if (command !== "reverse") {
+    throw new Error(`Unknown command: ${command}`)
+  }
+
+  const parsed = parseReverseArgs(args)
+  if (parsed.help) {
+    printHelp()
+    return 0
+  }
+
+  const [renderedDir, templateDir] = parsed.positional
+  if (!renderedDir || !templateDir || parsed.positional.length > 2) {
+    throw new Error("Usage: tdir reverse <rendered-dir> <template-dir> [--map <path>]")
+  }
+
+  const result = reverseDir(renderedDir, templateDir, { mapPath: parsed.mapPath })
+  console.log(`Wrote ${result.filesWritten} file${result.filesWritten === 1 ? "" : "s"}`)
+  for (const warning of result.warnings) {
+    console.warn(`Warning: ${warning.outputPath}: ${warning.message}`)
+  }
+  return result.warnings.length > 0 ? 2 : 0
+}
+
+try {
+  process.exitCode = main(process.argv.slice(2))
+} catch (error) {
+  console.error(error instanceof Error ? error.message : String(error))
+  process.exitCode = 1
+}