Automatically add MultiMC instances to the Windows start menu

New-Shortcut.ps1

param ( 
	[string]$SourceExe,
	[string]$DestinationPath,
	[bool]$Save = $true
)
$Path = "$(Resolve-Path $DestinationPath.SubString(0, $DestinationPath.LastIndexOf('\')))\$($DestinationPath.Split('\')[-1])"

$WshShell = New-Object -ComObject WScript.Shell
$Shortcut = $WshShell.CreateShortcut($Path)
$Shortcut.TargetPath = $SourceExe
if($Save) {$Shortcut.Save()}
$Shortcut

Update-Shortcuts.ps1

param ( [string]$MultiMCPath )

$StartMenu = New-Item -ItemType Directory -Path "$env:AppData\Microsoft\Windows\Start Menu\Programs\MultiMC" -ErrorAction SilentlyContinue
if ($null -eq $StartMenu) {
	$StartMenu = Get-Item -Path "$env:AppData\Microsoft\Windows\Start Menu\Programs\MultiMC"
}
$null = .\New-Shortcut.ps1 -SourceExe "$MultiMCPath\MultiMC.exe" -DestinationPath "$($StartMenu.FullName)\MultiMC.lnk"

$instances = Get-ChildItem "$MultiMCPath\instances" -Directory -Exclude "_MMC_TEMP"

for ($i = 0; $i -lt $instances.Length; $i++) {
	# if ([bool](Get-Item "$($instances[$i])\instance.cfg" -ErrorAction SilentlyContinue)) {
	# 	continue
	# }
	$FancyInstanceName = (Select-String -Path "$($instances[$i])\instance.cfg" -Pattern "name=" -Raw).Split("=")[1]
	$StoredInstanceName = ($instances[$i]).Name
	$InstanceIcon = (Select-String -Path "$($instances[$i])\instance.cfg" -Pattern "IconKey=" -Raw).Split("=")[1]
	$IconExists = [bool](Get-Item "$MultiMCPath\icons\$InstanceIcon" -ErrorAction SilentlyContinue)
	$Shortcut = .\New-Shortcut.ps1 -SourceExe "$MultiMCPath\MultiMC.exe" -DestinationPath "$($StartMenu.FullName)\$FancyInstanceName.lnk"
	$Shortcut.arguments = "-l $StoredInstanceName"
	Write-Output "Writing shortcut: $StoredInstanceName"
	if($IconExists) {
		# the only "external" command this script relies on
		magick convert -resize !256x256 "$MultiMCPath\icons\$InstanceIcon" "$MultiMCPath\icons\$InstanceIcon.ico"
		$Shortcut.IconLocation = "$MultiMCPath\icons\$InstanceIcon.ico,0"
	} else {
		$InstanceVersion = ((ConvertFrom-Json ([string](Get-Content "$($instances[$i])\mmc-pack.json"))).components|ForEach-Object {if($_.uid -eq "net.minecraft") {$_.version}})
		magick convert -background "#0000" -fill black -gravity center -size 256x128 caption:"$InstanceVersion" ".\multimc.ico" +swap -gravity south -composite "$MultiMCPath\icons\$InstanceVersion.ico"
		$Shortcut.IconLocation = "$MultiMCPath\icons\$InstanceVersion.ico,0"
	}
	$Shortcut.Save()
}