Powershell Prompt with git branch

Microsoft.PowerShell_profile.ps1

function prompt
{
    $username = $env:UserName
    $computer = $env:ComputerName
    $currentFolder = (Get-Item -Path .).Name
    $isGitFolder = (git rev-parse --git-dir 2> $null)
    $currentTime = Get-Date -Format HH:mm
    Write-Host "$username@$computer"-nonewline -foregroundcolor Green
    Write-Host "[$currentTime]" -nonewline -ForegroundColor Gray
    Write-Host " $currentFolder"-nonewline -foregroundcolor Cyan
    if($isGitFolder)
    {
        $currentBranch = (git symbolic-ref --short HEAD)
        Write-Host " ($currentBranch)" -nonewline  -foregroundcolor Magenta
    }
    
    Write-Host "$" -nonewline
    return " "
}