✨ Add winget installation script

PS5/Install-WinGet.ps1

@@ -0,0 +1,93 @@
+<#
+.SYNOPSIS
+Installs winget.
+
+.NOTES
+Adapted from https://github.com/microsoft/winget-cli/issues/3068#issuecomment-1763402494
+
+.LINK
+https://api.github.com/repos/microsoft/winget-cli/
+#>
+
+#Requires -Modules Appx
+[CmdletBinding()] Param(
+# Installs the early development version.
+[switch] $Prerelease
+)
+
+function Resolve-Download
+{
+	[CmdletBinding()] Param(
+	[Parameter(ParameterSetName='FileName',Mandatory=$true)][string] $FileName,
+	[Parameter(ParameterSetName='Uri',Mandatory=$true)][uri] $Uri
+	)
+	switch($PSCmdlet.ParameterSetName)
+	{
+		FileName {return Join-Path "$(Resolve-Path (Join-Path ~ Downloads))" $FileName}
+		Uri {return Join-Path "$(Resolve-Path (Join-Path ~ Downloads))" ($Uri.Segments[-1])}
+		default {Stop-ThrowError.ps1 'Bad params' -OperationContext $PSBoundParameters}
+	}
+}
+
+function Save-File
+{
+	[CmdletBinding()] Param(
+	[Parameter(Mandatory=$true)][uri] $Uri,
+	[Parameter(Mandatory=$true)][string] $Path,
+	[Parameter(Mandatory=$true)][string] $Hash
+	)
+	if((Test-Path $Path -Type Leaf) -and (Get-FileHash $Path).Hash -eq $Hash)
+	{
+		Write-Info.ps1 "Already downloaded $Uri" -fg Gray
+		return
+	}
+	Write-Info.ps1 "Downloading $Uri" -fg Cyan
+	Invoke-WebRequest -Uri $Uri -OutFile $Path
+	if((Get-FileHash $Path).Hash -ne $Hash)
+	{
+		Stop-ThrowError.ps1 "File hash doesn't match" -OperationContext $Path
+	}
+	Write-Info.ps1 "Saved to $Path" -fg Green
+}
+
+function Save-Files
+{
+	[CmdletBinding()] Param()
+	if([Net.ServicePointManager]::SecurityProtocol -lt [Net.SecurityProtocolType]::Tls12)
+	{
+		[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+	}
+	$assets =
+		if($Prerelease) {(Invoke-RestMethod https://api.github.com/repos/microsoft/winget-cli/releases?per_page=1).assets}
+		else {(Invoke-RestMethod https://api.github.com/repos/microsoft/winget-cli/releases/latest).assets}
+	$wingetfile = 'Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.msixbundle'
+	$wingeturi = $assets |Where-Object name -eq $wingetfile |Select-Object -ExpandProperty browser_download_url
+	$wingethash = $assets |
+		Where-Object name -eq "$([io.path]::ChangeExtension($wingetfile, 'txt'))" |
+		Select-Object -ExpandProperty browser_download_url |
+		ForEach-Object {Invoke-RestMethod $_}
+	$wingetfile = Resolve-Download -FileName $wingetfile
+	Save-File -Uri $wingeturi -Path $wingetfile -Hash $wingethash
+	$vclibsuri = 'https://aka.ms/Microsoft.VCLibs.x64.14.00.Desktop.appx'
+	$vclibsfile = Resolve-Download -Uri $vclibsuri
+	Save-File -Uri $vclibsuri -Path $vclibsfile `
+		-Hash 9BFDE6CFCC530EF073AB4BC9C4817575F63BE1251DD75AAA58CB89299697A569
+	$zipfile = Resolve-Download -FileName Microsoft.UI.Xaml.2.7.zip
+	Save-File -Uri https://www.nuget.org/api/v2/package/Microsoft.UI.Xaml/2.7.0 -Path $zipfile `
+		-Hash 422FD24B231E87A842C4DAEABC6A335112E0D35B86FAC91F5CE7CF327E36A591
+	$xamlfile = Resolve-Download -FileName Microsoft.UI.Xaml.2.7\tools\AppX\x64\Release\Microsoft.UI.Xaml.2.7.appx
+	if(!(Test-Path $xamlfile -Type Leaf))
+	{
+		Expand-Archive -Path $zipfile -DestinationPath (Resolve-Download -FileName Microsoft.UI.Xaml.2.7) -Force
+	}
+	return @{Path=$wingetfile;DependencyPath=$vclibsfile,$xamlfile}
+}
+
+function Install-WingetPackage
+{
+	[CmdletBinding()] Param()
+	$appx = Save-Files
+	Add-AppxPackage @appx
+}
+
+Install-WingetPackage