pm.ps1

param(
    [Parameter(Position=0, mandatory=$true)]
    [string] $Command,

    [Parameter(Position=1, Mandatory=$false, ValueFromRemainingArguments=$true)]
    [string[]] $CommandArgs
)

$PM_BASE_DIR = "$env:UserProfile\.pm"

function _GetProjectAbsPath {
    param(
        [Parameter(Position=0, mandatory=$true)]
        [string] $Name
    )

    $dest = "$PM_BASE_DIR\$name"

    if (!(Test-Path $dest)) {
        Write-Host "No project named $name"
        exit 1
    }

    return $dest
}

function Help {

}

function Add {
    param(
        [Parameter(Position=0, mandatory=$true)]
        [string] $Name,

        [string] $Path = '.'
    )

    if (!(Test-Path $path)) {
        Write-Host "Path ($path) does not exists"
        exit 1
    }

    $target = Resolve-Path -Path $path
    New-Item -ItemType Directory -Path $PM_BASE_DIR -Force | Out-Null
    New-Item -ItemType SymbolicLink -Path "$PM_BASE_DIR\$Name" -Target $target -Force | Out-Null
}

function Remove {
    param(
        [Parameter(Position=0, mandatory=$true)]
        [string] $Name
    )

    Remove-Item -Path (_GetProjectAbsPath $name)
}

function List {
    Get-ChildItem $PM_BASE_DIR | Select-Object Name, Target
}

function Go {
    param(
        [Parameter(Position=0, mandatory=$true)]
        [string] $Name
    )

    $path = _GetProjectAbsPath $name
    $symbolic = Get-Item $path
    if ($symbolic.Target.Length -gt 0) {
        Push-Location $symbolic.Target[0]
    } else {
        Push-Location $path
    }
}

function GoBack {
    Pop-Location
}

if ($Command -eq 'add') {
    Add @CommandArgs
} elseif (($Command -eq 'remove') -or ($Command -eq 'rm')) {
    Remove @CommandArgs
} elseif (($Command -eq 'list') -or ($Command -eq 'ls')) {
    List
} elseif ($Command -eq 'Go') {
    Go @CommandArgs
} elseif ($Command -eq 'GoBack') {
    GoBack
} elseif ($command -eq '--help') {
    help
} else {
    Write-Host "Unknown commands: $Command"
    help
}