From a47d90e5579bde89ffba40e62f1f3dd53499d18c Mon Sep 17 00:00:00 2001
From: Arutyun Mnatsakanyan <arutyun.mnatsakanyan@gmail.com>
Date: Mon, 7 Jan 2019 01:40:53 +0300
Subject: [PATCH] Improvements to PowerShell install script (#22)

---
 README.md   |  2 +-
 install.ps1 | 32 ++++++++++++++++----------------
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/README.md b/README.md
index f2b3c12..5c494f1 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,6 @@ curl -L https://deno.land/x/install/install.py | python - v0.2.0
 
 **Install with PowerShell:**
 
-```
+```powershell
 iwr https://deno.land/x/install/install.ps1 -out install.ps1; .\install.ps1 v0.2.0
 ```
diff --git a/install.ps1 b/install.ps1
index 18b3f83..a1b0ea2 100644
--- a/install.ps1
+++ b/install.ps1
@@ -1,5 +1,9 @@
 # Copyright 2018 the Deno authors. All rights reserved. MIT license.
 # TODO(everyone): Keep this script simple and easily auditable.
+param (
+  [alias("v")]
+  [string] $version
+)
 
 $ErrorActionPreference = "Stop"
 
@@ -18,21 +22,17 @@ function Write-Done {
   Write-Host "."
 }
 
-if ($args.count) {
-    # If specific release is mentioned
-    $release = $args[0]
-} else {
-    # Else determine latest Deno release via GitHub API.
-    $latest_release_uri = "https://api.github.com/repos/denoland/deno/releases/latest"
-    Write-Part "Downloading "; Write-Emphasized $latest_release_uri; Write-Part "..."
-    $latest_release_json = Invoke-WebRequest -Uri $latest_release_uri
-    Write-Done
+if (-not $version) {
+  # Determine latest Deno release via GitHub API.
+  $latest_release_uri = "https://api.github.com/repos/denoland/deno/releases/latest"
+  Write-Part "Downloading "; Write-Emphasized $latest_release_uri; Write-Part "..."
+  $latest_release_json = Invoke-WebRequest -Uri $latest_release_uri
+  Write-Done
 
-    Write-Part "Determining latest Deno release: "
-    $latest_release = ($latest_release_json | ConvertFrom-Json).tag_name
-    $release = $latest_release
-    Write-Emphasized $latest_release; Write-Part "... "
-    Write-Done
+  Write-Part "Determining latest Deno release: "
+  $version = ($latest_release_json | ConvertFrom-Json).tag_name
+  Write-Emphasized $version; Write-Part "... "
+  Write-Done
 }
 
 # Create ~\.deno\bin directory if it doesn't already exist
@@ -43,10 +43,10 @@ if (-not (Test-Path $deno_dir)) {
   Write-Done
 }
 
-# Download latest Deno release.
+# Download Deno release.
 $zip_file = "${deno_dir}\deno_win_x64.zip"
 $download_uri = "https://github.com/denoland/deno/releases/download/" +
-                "${release}/deno_win_x64.zip"
+                "${version}/deno_win_x64.zip"
 Write-Part "Downloading "; Write-Emphasized $download_uri; Write-Part "..."
 Invoke-WebRequest -Uri $download_uri -OutFile $zip_file
 Write-Done