Setup Python embeddable package as portable python. Installs `pip` and `virtualenv`

setup-python-embed.ps1

param (
    [Parameter(Mandatory = $true)]
    [string]$PythonFolderPath
)

# Ensure the provided path exists
if (-Not (Test-Path -Path $PythonFolderPath)) {
    Write-Error "The specified path '$PythonFolderPath' does not exist."
    exit 1
}

# Get the python version from the embedded folder's pth file
try {
    $pthFile = Get-ChildItem -Path $PythonFolderPath -Filter "python*._pth" | Select-Object -First 1

    if (-Not $pthFile) {
        Write-Error "Could not find a valid python*._pth file in the folder '$PythonFolderPath'."
        exit 1
    }

    $pthFilePath = $pthFile.FullName
    Write-Host "Found pth file: $pthFilePath"

    # Uncomment '#import site' in the pth file
    (Get-Content -Path $pthFilePath) |
        ForEach-Object { $_ -replace '^#import site', 'import site' } |
        Set-Content -Path $pthFilePath

    Write-Host "Uncommented '#import site' in the pth file."
} catch {
    Write-Error "An error occurred while processing the pth file: $_"
    exit 1
}

# Download and run get-pip.py
$GetPipUrl = "https://bootstrap.pypa.io/get-pip.py"
$GetPipScript = Join-Path -Path $PSScriptRoot -ChildPath "get-pip.py"

try {
    Write-Host "Downloading get-pip.py from $GetPipUrl..."
    Invoke-WebRequest -Uri $GetPipUrl -OutFile $GetPipScript

    $PythonExe = Join-Path -Path $PythonFolderPath -ChildPath "python.exe"

    if (-Not (Test-Path -Path $PythonExe)) {
        Write-Error "Could not find python.exe in the folder '$PythonFolderPath'."
        exit 1
    }

    Write-Host "Running get-pip.py..."
    & $PythonExe $GetPipScript
    Write-Host "Successfully installed pip."
} catch {
    Write-Error "An error occurred while downloading or running get-pip.py: $_"
    exit 1
}

# Install virtualenv using pip
try {
    Write-Host "Installing virtualenv using pip..."
    & $PythonExe -m pip install virtualenv
    Write-Host "Successfully installed virtualenv."
} catch {
    Write-Error "An error occurred while installing virtualenv: $_"
    exit 1
}

Write-Host "Python Embedded setup completed successfully."