UPDATE: I am now maintaining this script over on my Warcraft Wiki site on pbwiki. Please go there for documentation and the most recent updates.

I couldn't resist. Sometimes I don't even know why I do these things. Last night I decided to start playing with System.Net.WebClient from Windows PowerShell and four hours later I had something close. A few more hours today and now I have a PowerShell script that:

• Updates Subversion working copies (can be disabled w/ a switch)
• Can be configured to check for updates from wowinterface.com using a simple data file in your addons folder called addons.ps1 (see the comment header below for a sample of this file) and a nice XML endpoint provided by the guys at wowi (thanks Dolby!)
• Will check to see if an addon is one of the WowAce family of addons and will try to update it from their using their RSS feed for information.

I know I can add more addon sites to this later, but now that Auctioneer is up on wowi (ID: 4812) I don't know if I have any addons that I use that can't be updated by this script. Perhaps one or two, but that isn't bad given that I have 169 addons in my Addons directory.

This script has a few dependencies for extracting ZIP and RAR files. You will need to get unzip.exe from Info-ZIP and UnRar.exe from RARLabs and put them both on your path. Both are free.

Anyway, here is the script. There is a download at the bottom of this post for those of you who just want to have it.

DISCLAIMER: This script is supplied without warranty or support. If you play WoW and don't know anything about PowerShell, this might be a bit much for you. Take a look at WowAceUpdater or WUU instead.

  1 #########################################################################
  2 # Name: update-addons.ps1
  3 # Version: 1.0
  4 # Author: Peter Provost <peter@provost.org>
  5 #
  6 # Usage: update-addons [-skipSvn]
  7 #
  8 # Remarks: This is a simple powershell script for updating your
  9 #   World of Warcraft addons. It will autodetect SVN working copies
 10 #   and update them. It will look for a file called addons.ps1
 11 #   in your Addons folder to define special locations for downloading
 12 #   addons (see below for a sample addons.ps1). After that it will test
 13 #   if the addon can be updated from http://files.wowace.com. Any addon
 14 #   still unmatched will be skipped.
 15 #
 16 #   This sample addons.ps1 hows how to configure updates from 
 17 #   wowinterface.com:
 18 #
 19 #   $wowiAddons = @{
 20 #     'FlightMap' = 3897;
 21 #     'Clique' = 5108;
 22 #   };
 23 #
 24 #   At this point only wowinterface.com is supported in this data file
 25 #   but more may be added later.
 26 #
 27 #########################################################################
 28 
 29 param (
 30     [switch] $skipSvn
 31 );
 32 
 33 # Configuration - change these as needed
 34 $wowAddonDir = "C:\World of Warcraft\Interface\Addons";
 35 $stateFile = "PSUpdateAddons.state";
 36 
 37 function update-addon($addonSource, $downloadUrl, $remoteVersion, $fileName)
 38 {
 39     if ( $remoteVersion -ne $localVer) {
 40       write-host "$_ : ($addonSource) Update required: Current ver=$localVer, Remote ver=$remoteVersion";
 41 
 42       $tempFilePath = join-path $tempDir $fileName;
 43       downloadextract-addon $downloadUrl $tempFilePath;
 44 
 45       write-host "`tUpdating state file..." -noNewLine;
 46       $remoteVersion > $stateFilePath;
 47       "done." | write-host;
 48     } else {
 49       write-host "$_ : ($addonSource) Addon up-to-date. Skipping.";
 50     }
 51 }
 52 
 53 # Helper function for updating a single addon]
 54 function downloadextract-addon ([string] $uri, [string] $tempFile)
 55 {
 56   write-host "`tDownloading $uri to $($tempFile)..." -noNewLine;
 57   $wc.DownloadFile( $uri, $tempFile );
 58   write-host "done.";
 59 
 60   $ext = [System.IO.Path]::GetExtension($tempFile);
 61   switch ($ext) {
 62     ".rar" {
 63       write-host "`tExtracting RAR Archive..." -noNewLine;
 64       & unrar x -o+ $tempFile $wowAddonDir;
 65     }
 66     ".zip" {
 67       write-host "`tExtracting ZIP Archive..." -noNewLine;
 68       & unzip -o $tempFile -d $wowAddonDir;
 69     }
 70     default { write-host "UNKNOWN EXTENSION TYPE!" }
 71   }
 72   write-host "done.";
 73 
 74   write-host "`tDeleting zip file..." -noNewLine;
 75   remove-item $tempFile;
 76   write-host "done.";
 77 }
 78 
 79 function test-wowaceaddon( [string] $addonName )
 80 {
 81   return ((get-wowaceaddon $addonName)-ne $null)
 82 }
 83 
 84 function get-wowaceaddon( [string] $addonName )
 85 {
 86   $xpath = ("//item[title='ADDON']" -replace 'ADDON', $_.Name);
 87   return $indexXmlDoc.SelectSingleNode($xpath);
 88 }
 89 
 90 # Setup a few things before we get started
 91 $wc = new-object System.Net.WebClient;
 92 $tempDir = join-path (get-content env:\temp) "PsWowUpdater";
 93 if (-not (test-path $tempDir)) { new-item -type directory -path $tempDir; }
 94 
 95 # Load in the WowAce Index file
 96 write-host "Downloading latest.xml from http://files.wowace.com";
 97 $uri = "http://files.wowace.com/latest.xml";
 98 $rssData = $wc.DownloadString($uri);
 99 $indexXmlDoc = [xml] $rssData;
100 
101 # Load in the WOWI config database
102 . (join-path $wowAddonDir "addons.ps1")
103 
104 (get-childitem $wowAddonDir | ? { $_.PSIsContainer }) | % {
105 ## SVN UPDATE
106   if (join-path $_.Fullname ".svn" | test-path ) {
107     if ($skipSvn.isPresent) {
108       write-host "$_ : Skipping SVN working copy";
109     } else {
110       write-host "$_ : Updating SVN working copy";
111       svn up -q $_.Fullname;
112     }
113   }
114 
115 ## WOWINTERFACE.COM
116   elseif ($wowiAddons.Contains($_.Name)) {
117     $stateFilePath = join-path $_.Fullname "PSUpdateAddons.state";
118     $localVer = "";
119     if (test-path $stateFilePath) { $localVer = (get-content $stateFilePath); }
120 
121     $uri = ("http://www.wowinterface.com/patcherXXXX.xml" -replace "XXXX", $wowiAddons[$_.Name]);
122     $wowiXml = [xml] $wc.DownloadString($uri);
123 
124     $downloadUrl = $wowiXml.UpdateUI.Current.UIFileURL;
125     $remoteVersion = $wowiXml.UpdateUI.Current.UIVersion;
126     $fileName = $wowiXml.UpdateUI.Current.UIFile;
127     $addonSource = "WowInterface.com";
128 
129     update-addon $addonSource $downloadUrl $remoteVersion $fileName
130   }
131 
132 ## WOWACE FILES
133   elseif (test-wowaceaddon $_.Name) {
134     $stateFilePath = join-path $_.Fullname "PSUpdateAddons.state";
135     $localVer = "";
136     if (test-path $stateFilePath) { $localVer = (get-content $stateFilePath); }
137 
138     $elt = get-wowaceaddon $_.Name;
139 
140     $downloadUrl = $elt.enclosure.url;
141     $remoteVersion = $elt.version;
142     $fileName = $downloadUrl.Substring($downloadUrl.LastIndexOf("/")+1);
143     $addonSource = "WowAce.com";
144 
145     update-addon $addonSource $downloadUrl $remoteVersion $fileName
146   }
147 
148 ## Unknown addon source
149   else {
150     write-host "$_ : Can't figure this one out. Skipping.";
151   }
152 }

Download update-addons.zip (2KB). And here is my addons.ps1 data file to update my wowi addons. Create a file like that in your Addons folder and the script will find it.