Helper functions deleted from a PSES PR that might come in handy later

PsesHelpers.ps1

function Enable-WritingToPath {
    param([string]$Path)

    # This is not a problem on Windows
    if (-not ($IsMacOS -or $IsLinux)) {
        return
    }

    Write-Verbose "Setting permissions on path: $Path"
    sudo chmod o+w $Path
    $permissions = if ($IsLinux) {
        stat -c "%a" $Path
    } else {
        stat -f "%A" $Path
    }
    Write-Verbose "Permissions set to $permissions"
}

function Invoke-WithPSCoreModulePath {
    param(
        [string]$NewModulePath,
        [scriptblock]$ScriptBlock
    )

    $configBase = if ($IsLinux -or $IsMacOS) {
        "$HOME/.config/powershell"
    } else {
        "$HOME\Documents\PowerShell"
    }

    $configPath = Join-Path $configBase 'powershell.config.json'

    if (-not (Test-Path $configBase)) {
        New-Item -ItemType Directory -Path $configPath
    } elseif (Test-Path $configPath) {
        $configBackupPath = Join-Path ([System.IO.Path]::GetTempPath()) 'powershell.config.backup.json'
        Copy-Item -Path $configPath -Destination $configBackupPath -Force
    }

    try {
        Enable-WritingToPath $configPath
        $escapedPath = $NewModulePath -replace '\\', '\\'
        New-Item -Path $configPath -Value "{ `"PSModulePath`": `"$escapedPath`" }" -Force
        & $ScriptBlock
    } finally {
        Remove-Item -Path $configPath

        if ($configBackupPath) {
            Move-Item -Path $configBackupPath -Destination $configPath -Force
        }
    }
}

function Get-PSCoreModules {
    param(
        [ValidateNotNullOrEmpty()][string]$PSVersion = '6.1.0',
        [string]$DestinationPath
    )

    $tmpPath = [System.IO.Path]::GetTempPath()

    $relativeModulePath = 'Modules/'

    if (-not $DestinationPath) {
        $DestinationPath = Join-Path $tmpPath 'PSCoreModules'
    }

    if (Test-Path $DestinationPath) {
        return Join-Path $DestinationPath $relativeModulePath
    }

    if ($IsMacOS) {
        $os = 'osx'
        $ext = 'tar.gz'
    } elseif ($IsLinux) {
        $os = 'linux'
        $ext = 'tar.gz'
    } else {
        $os = 'win'
        $ext = 'zip'
    }

    $uri = "https://github.com/PowerShell/PowerShell/releases/download/v$PSVersion/powershell-$PSVersion-$os-x64.$ext"

    $downloadPath = Join-Path $tmpPath "pscoremodules.$ext"

    if (-not (Test-Path $downloadPath)) {
        Invoke-WebRequest -Uri $uri -OutFile $downloadPath
    }

    if ($IsMacOS -or $IsLinux) {
        New-Item -ItemType Directory -Path $DestinationPath
        tar xvf $downloadPath -C $DestinationPath
    } else {
        Expand-Archive -Path $downloadPath -DestinationPath $DestinationPath
    }

    return Join-Path $DestinationPath $relativeModulePath
}