A powershell prompt function for showing current git branch.

profile.ps1

function Prompt {
    Write-Host "PS $($executionContext.SessionState.Path.CurrentLocation)" -NoNewline
    $head = git symbolic-ref HEAD
    if($null -ne $head) {
        Write-Host " " -NoNewline
        Write-Host "[$($head.substring($head.LastIndexOf("/") +1))]" -ForegroundColor Yellow -BackgroundColor Red -NoNewline
    }
    "$('>' * ($nestedPromptLevel + 1)) "
}