extension.yaml

Name: Steam Last Played
Author: Blake Burkhart
Version: 0.1.0
Module: SteamLastPlayed.ps1
Type: Script
Functions:
    - Description: Update Last Played for all Steam Games
      FunctionName: SteamLastPlayed

SteamLastPlayed.ps1

Function Convert-FromUnixDate ($UnixDate) {
    [timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($UnixDate))
}

function global:SteamLastPlayed()
{
    $steamGuid = [Guid]"CB91DFC9-B977-43BF-8E70-55F46E410FAB"
    $app = [PlayniteUI.App]::CurrentApp
    $steamLibrary = $app.Extensions.LibraryPlugins[$steamGuid].Plugin
    # HACK HACK HACK: We want to access the Steam plugin's settings to access the user id
    $settings = $steamLibrary.GetType().GetProperty("LibrarySettings", [Reflection.BindingFlags]::NonPublic -bor [Reflection.BindingFlags]::Instance).GetValue($steamLibrary)
    # TODO: User should be able to select Id
    $id = ($settings.SteamUsers | Select-Object -First 1).Id
    $accountId = [SteamKit2.SteamID]::new($id).AccountID
    $installationPath = [SteamLibrary.Steam]::InstallationPath
    $vdfPath = [io.Path]::Combine($installationPath, "userdata", $accountId, "config", "localconfig.vdf")
    $localconfig = [SteamKit2.KeyValue]::new()
    $localconfig.ReadFileAsText($vdfPath)
    $apps = $localconfig["Software"]["Valve"]["Steam"]["Apps"]

    $PlayniteApi.Database.GetGames() | % {
        if ($_.PluginId -eq $steamGuid ) {
            $steamInfo = $apps[$_.GameId]
            if ($steamInfo.Children) {
                $lastPlayed = Convert-FromUnixDate $steamInfo["LastPlayed"].Value
                # TODO: Should keep which ever date is newer
                $_.LastActivity = $lastPlayed
                $PlayniteApi.Database.UpdateGame($_)
            }
        }
    }

    $PlayniteApi.Dialogs.ShowMessage("Done");
}