Merge pull request microsoft#165634 from rwe/serialize-message-ps1

shellIntegration.ps1: escape values in "E" (executed command) and "P" (property KV) codes

Author: Tyriar

src/vs/workbench/contrib/terminal/browser/media/shellIntegration.ps1

@@ -16,10 +16,22 @@ if ($ExecutionContext.SessionState.LanguageMode -ne "FullLanguage") {
 $Global:__VSCodeOriginalPrompt = $function:Prompt
 
 $Global:__LastHistoryId = -1
-function Set-Serialized {
-	param ([string] $toSerialize)
-	$toSerialize = $toSerialize.Replace("\", "\\").Replace("`n", "\x0a").Replace(";", "\x3b")
-	return $toSerialize
+
+function Global:__VSCode-Escape-Value([string]$value) {
+	# NOTE: In PowerShell v6.1+, this can be written `$value -replace '…', { … }` instead of `[regex]::Replace`.
+	# Replace any non-alphanumeric characters.
+	[regex]::Replace($value, '[^a-zA-Z0-9]', { param($match)
+		# Backslashes must be doubled.
+		if ($match.Value -eq '\') {
+			'\\'
+		} else {
+			# Any other characters are encoded as their UTF-8 hex values.
+			-Join (
+				[System.Text.Encoding]::UTF8.GetBytes($match.Value)
+				| ForEach-Object { '\x{0:x2}' -f $_ }
+			)
+		}
+	})
 }
 
 function Global:Prompt() {
@@ -43,7 +55,7 @@ function Global:Prompt() {
 			} else {
 				$CommandLine = ""
 			}
-			$Result += Set-Serialized($CommandLine)
+			$Result += $(__VSCode-Escape-Value $CommandLine)
 			$Result += "`a"
 			# Command finished exit code
 			# OSC 633 ; D [; <ExitCode>] ST
@@ -55,7 +67,7 @@ function Global:Prompt() {
 	$Result += "$([char]0x1b)]633;A`a"
 	# Current working directory
 	# OSC 633 ; <Property>=<Value> ST
-	$Result += if($pwd.Provider.Name -eq 'FileSystem'){"$([char]0x1b)]633;P;Cwd=$($pwd.ProviderPath)`a"}
+	$Result += if($pwd.Provider.Name -eq 'FileSystem'){"$([char]0x1b)]633;P;Cwd=$(__VSCode-Escape-Value $pwd.ProviderPath)`a"}
 	# Before running the original prompt, put $? back to what it was:
 	if ($FakeCode -ne 0) {
 		Write-Error "failure" -ea ignore