Git/Mercurial PowerShell prompt.

Microsoft.PowerShell_profile.ps1

# ssg's powershell profile - latest version is at https://gist.github.com/ssg/5195412

# only feature is to show hg/git current branch on the prompt

$vcTypes = @(
    @{
        Name         = "hg"
        Directory    = ".hg"
        BranchScript = { Get-Content ".hg\branch" }
    },    
    @{
        Name         = "git"
        Directory    = ".git"
        BranchScript = { 
            (Get-Content ".git\HEAD" 
            | Select-String -Pattern "/([^/]+)$").Matches.Groups[1].Value 
        }
    }
)

function getRepositoryType($folder) {
    while ($folder) {
        $path = $folder.FullName
        foreach ($vc in $vcTypes) {
            if (Test-Path (Join-Path $path $($vc.Directory))) {
                return $vc;
            }
        }
        $folder = $folder.Parent
    }
    return $null
}

function writeBranch {
    $vc = getRepositoryType (Get-Item .)
    if ($vc) {
        Write-Host -NoNewLine -ForegroundColor White " [$($vc.Name):"
        try {
            $branch = Invoke-Command -NoNewScope $vc.BranchScript
            Write-Host -NoNewLine -ForegroundColor Cyan "$branch"
        }
        catch {            
            Write-Host -NoNewLine -ForegroundColor Red "???"
        }
        Write-Host -NoNewLine -ForegroundColor White "]"
    }
}

# show current branch in mercurial at the prompt
function prompt {
    Write-Host -NoNewLine "PS $pwd" 
    writeBranch
    return ">"
}

Set-Alias ll dir

To install it, run this PowerShell command (WARNING: it overwrites your existing PowerShell profile if it exists, so don't run this if you already customized it):

mkdir -Force (Split-Path $profile);iwr -Uri "https://gist.github.com/ssg/5195412/raw/" -OutFile $Profile