added methods for unicode

Author: MikeKovarik

src/Registry.mjs

@@ -1,5 +1,5 @@
 import {HIVES, shortenHive, extendHive} from './constants.mjs'
-import {sanitizePath} from './util.mjs'
+import {sanitizePath, spawn} from './util.mjs'
 
 
 // Collection of static methods for interacting with any key in windows registry.
@@ -33,11 +33,39 @@ export class Registry {
 		return args
 	}
 
+	static async setCodePage(encoding) {
+		try {
+			await spawn('cmd.exe', ['/c', 'chcp', encoding])
+		} catch (e) {
+			throw new Error(`Invalid code page: ${encoding}`)
+		}
+	}
+
+	static async enableUnicode() {
+		if (this.unicode) return
+		var {stdout} = await spawn('cmd.exe', ['/c', 'chcp'])
+		var cp = Number(stdout.split(':')[1])
+		if (Number.isNaN(cp)) throw new Error(`Can't get current code page`)
+		this.lastCodePage = cp
+		this.unicode = true
+	}
+
+	static async disableUnicode() {
+		if (!this.unicode) return
+		await this.setCodePage(this.lastCodePage)
+		this.lastCodePage = undefined
+		this.unicode = false
+	}
+
 }
 
 Registry.VALUES = '$values'
 Registry.DEFAULT = ''
 
+
+Registry.unicode = false
+Registry.lastCodePage
+
 // Only names and paths are affected, not the data
 Registry.lowercase = true
 // Calls return simplified output format by default.

src/util.mjs

@@ -71,7 +71,7 @@ function promiseOnce(eventEmitter, event) {
 }
 
 // Promise wrapper for child_process.spawn().
-var spawn = async (program, args) => {
+export var spawn = async (program, args) => {
 	var stdio = ['ignore', 'pipe', 'pipe']
 	var proc = cp.spawn(program, args, {stdio})