lcthw-windows-installers/odin.ps1

function Test-WinUtilPackageManager {
    <#

    .SYNOPSIS
        Checks if Winget is installed

    .PARAMETER winget
        Check if Winget is installed

    #>

    Param(
        [System.Management.Automation.SwitchParameter]$winget
    )

    $status = "not-installed"

    if ($winget) {
        # Check if Winget is available while getting it's Version if it's available
        $wingetExists = $true
        try {
            $wingetVersionFull = winget --version
        } catch [System.Management.Automation.CommandNotFoundException], [System.Management.Automation.ApplicationFailedException] {
            Write-Warning "Winget was not found due to un-availablity reasons"
            $wingetExists = $false
        } catch {
            Write-Warning "Winget was not found due to un-known reasons, The Stack Trace is:`n$($psitem.Exception.StackTrace)"
            $wingetExists = $false
	}

        # If Winget is available, Parse it's Version and give proper information to Terminal Output.
	# If it isn't available, the return of this funtion will be "not-installed", indicating that
        # Winget isn't installed/available on The System.
	if ($wingetExists) {
            # Check if Preview Version
            if ($wingetVersionFull.Contains("-preview")) {
                $wingetVersion = $wingetVersionFull.Trim("-preview")
                $wingetPreview = $true
            } else {
                $wingetVersion = $wingetVersionFull
                $wingetPreview = $false
            }

            # Check if Winget's Version is too old.
            $wingetCurrentVersion = [System.Version]::Parse($wingetVersion.Trim('v'))
            # Grabs the latest release of Winget from the Github API for version check process.
            $response = Invoke-RestMethod -Uri "https://api.github.com/repos/microsoft/Winget-cli/releases/latest" -Method Get -ErrorAction Stop
            $wingetLatestVersion = [System.Version]::Parse(($response.tag_name).Trim('v')) #Stores version number of latest release.
            $wingetOutdated = $wingetCurrentVersion -lt $wingetLatestVersion
            Write-Host "===========================================" -ForegroundColor Green
            Write-Host "---        Winget is installed          ---" -ForegroundColor Green
            Write-Host "===========================================" -ForegroundColor Green
            Write-Host "Version: $wingetVersionFull" -ForegroundColor White

            if (!$wingetPreview) {
                Write-Host "    - Winget is a release version." -ForegroundColor Green
            } else {
                Write-Host "    - Winget is a preview version. Unexpected problems may occur." -ForegroundColor Yellow
            }

            if (!$wingetOutdated) {
                Write-Host "    - Winget is Up to Date" -ForegroundColor Green
                $status = "installed"
            }
            else {
                Write-Host "    - Winget is Out of Date" -ForegroundColor Red
                $status = "outdated"
            }
        } else {
            Write-Host "===========================================" -ForegroundColor Red
            Write-Host "---      Winget is not installed        ---" -ForegroundColor Red
            Write-Host "===========================================" -ForegroundColor Red
            $status = "not-installed"
        }
    }

    return $status
}

function ConfirmBaseRun {
  $isWingetInstalled = Test-WinUtilPackageManager -winget

  if (!($isWingetInstalled -eq "installed")) {
    Write-Warning "!!! Winget is not installed."

    Write-Host "You haven't run the base.ps1 script yet. Please visit https://learncodethehardway.com/setup/installers.html for more."

    Exit
  }
}

ConfirmBaseRun

$odinPath = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath("$env:APPDATA\..\Local\Programs\Odin")

if(Test-Path -Path $odinPath) {
  Write-Warning "#=========================================================#"
  Write-Warning "!! The directory $odinPath already exists, which means"
  Write-Warning "!! you already have odin installed.  Here's the version:"
  cat "$odinPath\mingw64\version_info.txt"
  Write-Warning "#=========================================================#"
  Write-Warning "Here's the version that Winget will install:"
  winget search odin-lang.Odin
  Write-Warning "--- If you want me to replace your install with this version, then stop and"
  Write-Warning "delete the $odinPath directory before hitting ENTER to continue."
  Write-Warning "!!! If you do NOT want to replace this directory then hit CTRL-C now."
  Read-Host -Prompt "Press any key to continue, or CTRL-C to abort" | Out-Null
}

Write-Warning "!! Installing Odin in $odinPath"
Write-Warning "This has to be installed this way because winget won't add it to the path so I have to do it manually. If you don't want this, then hit CTRL-C and install Odin yourself."
Read-Host -Prompt "Press any key to continue, or CTRL-C to abort" | Out-Null

winget install --location "$odinPath" -e odin-lang.Odin

if($env:PATH.contains($odinPath)) {
  Write-Warning "!! Detected $odinPath in your PATH.  Will not update your PATH."
  Write-Warning "!! This is probably because you already installed it. You'll have"
  Write-Warning "!! to manually remove this part of your path if you want to change it."
  Write-Warning "!! But, it will probably still work since that's where I installed it."
} else {
  $newPath = $env:PATH + ";$odinPath"
  [Environment]::SetEnvironmentVariable("Path", $newPath, "User")
}