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#!/usr/bin/env pwsh# Copyright 2018 the Deno authors. All rights reserved. MIT license.# TODO(everyone): Keep this script simple and easily auditable.
$ErrorActionPreference = 'Stop'
if ($v) {  $Version = "v${v}"}if ($args.Length -eq 1) {  $Version = $args.Get(0)}
$DenoInstall = $env:DENO_INSTALL$DenoBinDir = if ($DenoInstall) {  "$DvmDir\bin"} else {  "$Home\.deno\bin"}
$DvmDir = $env:DVM_DIR$BinDir = if ($DvmDir) {  "$DvmDir\bin"} else {  "$Home\.dvm\bin"}
$DvmZip = "$BinDir\dvm.zip"$DvmExe = "$BinDir\dvm.exe"$Target = 'x86_64-pc-windows-msvc'
# GitHub requires TLS 1.2[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
$DvmUri = if (!$Version) {  $Response = Invoke-WebRequest 'https://github.com/justjavac/dvm/releases' -UseBasicParsing  if ($PSVersionTable.PSEdition -eq 'Core') {    $Response.Links |      Where-Object { $_.href -like "/justjavac/dvm/releases/download/*/dvm-${Target}.zip" } |      ForEach-Object { 'https://github.com' + $_.href } |      Select-Object -First 1  } else {    $HTMLFile = New-Object -Com HTMLFile    if ($HTMLFile.IHTMLDocument2_write) {      $HTMLFile.IHTMLDocument2_write($Response.Content)    } else {      $ResponseBytes = [Text.Encoding]::Unicode.GetBytes($Response.Content)      $HTMLFile.write($ResponseBytes)    }    $HTMLFile.getElementsByTagName('a') |      Where-Object { $_.href -like "about:/justjavac/dvm/releases/download/*/dvm-${Target}.zip" } |      ForEach-Object { $_.href -replace 'about:', 'https://github.com' } |      Select-Object -First 1  }} else {  "https://github.com/justjavac/dvm/releases/download/${Version}/dvm-${Target}.zip"}
if (!(Test-Path $BinDir)) {  New-Item $BinDir -ItemType Directory | Out-Null}
Invoke-WebRequest $DvmUri -OutFile $DvmZip -UseBasicParsing
if (Get-Command Expand-Archive -ErrorAction SilentlyContinue) {  Expand-Archive $DvmZip -Destination $BinDir -Force} else {  if (Test-Path $DvmExe) {    Remove-Item $DvmExe  }  Add-Type -AssemblyName System.IO.Compression.FileSystem  [IO.Compression.ZipFile]::ExtractToDirectory($DvmZip, $BinDir)}
Remove-Item $DvmZip
$User = [EnvironmentVariableTarget]::User$Path = [Environment]::GetEnvironmentVariable('Path', $User)
if (!(";$Path;".ToLower() -like "*;$DenoInstall;*".ToLower())) {  [Environment]::SetEnvironmentVariable('Path', "$Path;$DenoInstall", $User)  $Env:Path += ";$DenoInstall"}if (!(";$Path;".ToLower() -like "*;$BinDir;*".ToLower())) {  [Environment]::SetEnvironmentVariable('Path', "$Path;$BinDir", $User)  $Env:Path += ";$BinDir"}
Write-Output "Dvm was installed successfully to $DvmExe"Write-Output "Run 'dvm --help' to get started"