Steam Related Functions

Steam.ps1

function Get-SteamPath {
    # Get the Steam installation directory.

    # MUICache
    $muicache = "Registry::HKCR\Local Settings\Software\Microsoft\Windows\Shell\MuiCache"
    $protocol = "Registry::HKCR\steam\Shell\Open\Command"

    # MUICache
    $steam = Split-Path (((Get-Item $MuiCache).Property | Where-Object {$PSItem -Like "*Steam*"} | Where-Object {(Get-ItemPropertyValue $MuiCache -Name $PSItem) -eq "Steam"}).TrimEnd(".FriendlyAppName"))
    # Steam Browser Protocol
    if ($null -eq $steam) {
        
        $steam = Split-Path (((Get-ItemPropertyValue "$protocol" -Name "(Default)" -ErrorAction SilentlyContinue) -Split "--", 2, "SimpleMatch")[0]).Trim('"')
    }

    return $steam
}


function Get-SteamLibraryFolders {
    # Get all Steam library folders.
    
    $folders = @()
    $libs = "$(Get-SteamPath)\config\libraryfolders.vdf"
    foreach ($l in (Get-Content "$libs" -Encoding "UTF8")) {
        $l = $l.Trim()
        if ($l.StartsWith("`"path`"")) {
            $folders += ($l -Split "`"path`"", 2, "SimpleMatch")[1].Trim().Trim("`"").Replace("\\", "\")
        }
    }
    return $folders
}

function Get-SteamGameInstallDir ([string]$game) {
    # Get the installation directory of a Steam game.

    $folders = Get-SteamLibraryFolders
    foreach ($f in $folders) {
        $dir = "$f\steamapps\common\$game"
        if (Test-Path $dir.ToLower()) {
            return "$dir"
        }
    }
}

function Set-SteamGameLaunchOptions ([string]$gameid, [string]$launchopts) {
    # Set the launch options of a Steam game.

    $steampath = Get-SteamPath
    $users = (Get-ChildItem "$steampath\userdata").Name
    $tab = "`t" * 5
    $game = $false

    # Shutdown Steam if its running or else Steam will not read the changes written to "localconfig.vdf".
    if ($null -ne (Get-Process "Steam" -ErrorAction SilentlyContinue)) { 
        Invoke-Expression "& `"$steampath\steam.exe`" -shutdown" 
    }
    :master foreach ($user in $users) {
        $p = "$steampath\userdata\$user\config\localconfig.vdf"
        $cr = Get-Content "$p" -Encoding "UTF8"
        $cw = [System.Collections.ArrayList]$cr

        # The file will be split at this line.
        $n = $cw.IndexOf("$tab`"$gameid`"") + 1

        foreach ($l in $cr) {
            $l = $l.TrimEnd()
            if ($l.StartsWith($tab)) {
                if ($game) {
                    # Remove any existing launch options.
                    if ($l.Trim().StartsWith("`"LaunchOptions`"")) {
                        $cw.RemoveAt($cw.IndexOf($l))
                    }
                }
                if ($l.Trim() -eq "`"$gameid`"") { $game = $true }
                elseif ($game -and ($l -eq "$tab}")) { break master }
            }
        }
    }
    Set-Content "$p" -Value ($cw[0..$n] + @("$tab`t`"LaunchOptions`"		`"$launchopts`"") + $cw[($n + 1)..$cw.Count]) -Encoding "UTF8"
}