Set-GoPath.ps1

$GOPATH = 'C:\BlahBlahBlah\Blah'
$GOPATH_BIN = "$GOPATH\bin"

$env:GOPATH = $GOPATH

if ($env:Path.IndexOf($GOPATH_BIN, [StringComparison]::OrdinalIgnoreCase) -lt 0)
{
    if (($env:Path.Length -eq 0) -or ($env:Path[$env:Path.Length - 1] -eq ';'))
    {
        $env:Path += "$GOPATH_BIN"
    }
    else
    {
        $env:Path += ";$GOPATH_BIN"
    }
}

Unset-GoPath.ps1

if ($env:GOPATH.Length -le 0) {
    return
}

$GOPATH_BIN = "$env:GOPATH\bin"

if ($GOPATH_BIN.Length -gt 0) {
    $i = $env:Path.IndexOf($GOPATH_BIN)
    if ($i -ge 0) {
        $offset = $i
        $len = $GOPATH_BIN.Length
        if ($i -gt 0 -and $env:Path[$i - 1] -eq ';') {
            $offset--
            $len++
        }

        if (($offset -eq 0) -and ($len -lt $env:Path.Length) -and ($env:Path[$len] -eq ';')) {
            $len++
        }

        $env:Path = $env:Path.Remove($offset, $len)
    }
}

if ($GOBIN.Length -gt 0) {
    $i = $env:Path.IndexOf($GOBIN)
    if ($i -ge 0) {
        $offset = $i
        $len = $GOBIN.Length
        if ($i -gt 0 -and $env:Path[$i - 1] -eq ';') {
            $offset--
            $len++
        }

        if (($offset -eq 0) -and ($len -lt $env:Path.Length) -and ($env:Path[$len] -eq ';')) {
            $len++
        }

        $env:Path = $env:Path.Remove($offset, $len)
    }
}

if (Test-Path Env:\GOPATH) {
    Remove-Item Env:\GOPATH
}

if (Test-Path Env:\GOBIN) {
    Remove-Item Env:\GOBIN
}