function Get-ToolcacheRubyVersions {
    $toolcachePath = Join-Path $env:AGENT_TOOLSDIRECTORY "Ruby"
    return Get-ChildItem $toolcachePath -Name | Sort-Object { [Version]$_ }
}

function Get-ToolcachePythonVersions {
    $toolcachePath = Join-Path $env:AGENT_TOOLSDIRECTORY "Python"
    return Get-ChildItem $toolcachePath -Name | Sort-Object { [Version]$_ }
}

function Get-ToolcachePyPyVersions {
    $toolcachePath = Join-Path $env:AGENT_TOOLSDIRECTORY "PyPy"
    Get-ChildItem -Path $toolcachePath -Name | Sort-Object { [Version] $_ } | ForEach-Object {
        $pypyRootPath = Join-Path $toolcachePath $_ "x64"
        [string]$pypyVersionOutput = & "$pypyRootPath/bin/python" -c "import sys;print(sys.version)"
        $pypyVersionOutput -match "^([\d\.]+) \(.+\) \[PyPy ([\d\.]+\S*) .+]$" | Out-Null
        return "{0} [PyPy {1}]" -f $Matches[1], $Matches[2]
    }
}

function Get-ToolcacheNodeVersions {
    $toolcachePath = Join-Path $env:AGENT_TOOLSDIRECTORY "node"
    return Get-ChildItem $toolcachePath -Name | Sort-Object { [Version]$_ }
}

function Get-ToolcacheGoVersions {
    $toolcachePath = Join-Path $env:AGENT_TOOLSDIRECTORY "go"
    return Get-ChildItem $toolcachePath -Name | Sort-Object { [Version]$_ }
}