Posh-git for TFS. Shows the workspace name, mapped server folder, changesets since you last did a get, and any pending checkouts. Also shows using the API from PowerShell

GetTfsWorkspace\GetTfsWorkspace.psm1

function Get-TfsWorkspace
{
    # Script to find a Team Foundation workspace
    [cmdletbinding()]
    param(
        [string] $workspaceHint = $pwd
    )

    begin
    {
      # load the needed client dll's
      [void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.TeamFoundation.Client")
      [void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.TeamFoundation.VersionControl.Client")
    }

    process
    {
      try
      {
        $wsi = [Microsoft.TeamFoundation.VersionControl.Client.Workstation]::Current.GetLocalWorkspaceInfo($workspaceHint)
        if ($wsi)
        {
          $tfs = New-Object Microsoft.TeamFoundation.Client.TfsTeamProjectCollection($wsi.ServerUri)
          $wsi.GetWorkspace($tfs)
        }
      }
      catch {}
    }
}

function Get-TfsWorkspacePendingChanges()
{
  [cmdletbinding()]
  param(
    $ws = (Get-TfsWorkSpace -ErrorAction SilentlyContinue)
  )

  $ws.GetPendingChanges()
}

function Get-TfsWorkspacePendingChangeCounts()
{
  [cmdletbinding()]
  param(
    $ws = (Get-TfsWorkSpace -ErrorAction SilentlyContinue)
  )

  Get-TfsWorkspacePendingChanges -ws $ws | Group-Object ChangeType
}

function Get-TfsWorkspaceNewChangeset()
{
  [cmdletbinding()]
  param(
    $ws = (Get-TfsWorkSpace -ErrorAction SilentlyContinue)
  )

  if ($ws)
  {
    $rec = [Microsoft.TeamFoundation.VersionControl.Client.RecursionType]::Full
    $ver = new-object Microsoft.TeamFoundation.VersionControl.Client.WorkspaceVersionSpec($ws)

    $folders = $ws | Select-Object -ExpandProperty Folders | Where-Object { -not $_.IsCloaked }
    
    foreach ($folder in $folders)
    {
      Write-Verbose "Getting latest changeset for $($folder.LocalItem)" 

      $hp1 = New-Object Microsoft.TeamFoundation.VersionControl.Client.QueryHistoryParameters($folder.LocalItem, $rec)
      $hp1.ItemVersion = $ver
      $hp1.VersionEnd = $ver
      $hp1.MaxResults = 1

      $cs1 = $ws.VersionControlServer.QueryHistory($hp1) | select -First 1
      Write-Verbose "$($folder.LocalItem) : Workspace changeset = $($cs1.ChangesetId)" 

      $hp2 = New-Object Microsoft.TeamFoundation.VersionControl.Client.QueryHistoryParameters($folder.LocalItem, $rec)
      $hp2.ItemVersion = [Microsoft.TeamFoundation.VersionControl.Client.VersionSpec]::Latest
      $hp2.VersionEnd = [Microsoft.TeamFoundation.VersionControl.Client.VersionSpec]::Latest
      $hp2.MaxResults = 1

      $cs2 = $ws.VersionControlServer.QueryHistory($hp2) | select -First 1
      Write-Verbose "$($folder.LocalItem) : Latest changeset = $($cs2.ChangesetId)" 
      
      if ($cs1.ChangesetId -ne $cs2.ChangesetId)
      {
        @{ Path=$folder.LocalItem; Old = $cs1; New = $cs2 }
      }
    }
  }
}

Microsoft.PowerShell_profile.ps1

Import-Module GetTfsWorkspace

function PROMPT
{
  $ws = Get-TfsWorkspace -ErrorAction SilentlyContinue
  if ($ws)
  {
    Write-Host -ForegroundColor DarkYellow ("$($ws.Name) | ") -NoNewline
    Write-Host -ForegroundColor DarkYellow ("$($ws.GetServerItemForLocalItem($pwd)) ") -NoNewline

    Get-TfsWorkspacePendingChangeCounts -ws $ws | foreach-object {
      Write-Host -ForegroundColor Blue (" [$($_.Name):$($_.Count)] ") -NoNewline
    }
 
    Write-Host ""
    
    Get-TfsWorkspaceNewChangeset  -ws $ws | Foreach-Object {
      Write-Host -ForegroundColor Red ("OUT OF DATE : $($_.Old.ChangesetId)~$($_.New.ChangesetId) $($_.Path)" ) -nonewline
      Write-Host ""
    }
  }

  $host.UI.RawUI.WindowTitle = $pwd
  Write-Host "$((Get-Date).ToString()) | " -NoNewLine
  Write-Host "$PWD | ($lastExitCode|$($error.count))" -NoNewLine 
}