Combined Mercurial and Git PowerShell Prompt

prompt.ps1

if (test-path function:\prompt) {
   $oldPrompt = ls function: | ? {$_.Name -eq "prompt"}
   remove-item -force function:\prompt
 }
 function prompt {
  function getGitStatus {
  $branch = git branch 2>&1
  if($branch.Exception -eq $null) {
    $status = "git"
    $branch | foreach {
      if ($_ -match "^\*(.*)"){
        $status += $matches[1]
      }
    }
 
    $untracked = 0
    $updates = 0
    $deletes = 0
    $addsIndex = 0
    $deletesIndex =0
    $updatesIndex = 0
 
    git status --porcelain | foreach {
      if($_ -match "^([\w?]|\s)([\w?])?\s*") {
        switch ($matches[1]) {
          "A" {$addsIndex++ }
          "M" {$updatesIndex++ }
          "D" {$deletesIndex++ }
          "?" {$untracked++ }
        }
        switch ($matches[2]) {
          "A" {$adds++ }
          "M" {$updates++ }
          "D" {$deletes++ }
         }
      }
    }
    $status += " a:" +$addsIndex
    if($adds -gt 0) {
      $status += "($adds)"
    }
 
    $status += " m:" +$updatesIndex
    if($updates -gt 0) {
      $status += "($updates)"
    }
 
    $status += " d:" +$deletesIndex
    if($deletes -gt 0) {
      $status += "($deletes)"
    }     
 
    $status += " ?:$untracked"
    return $status
  }
  else {
    return $false
  }
}
 
  function getHgStatus {
    $summary = hg summary 2>&1
    if($summary.Exception -eq $null) {
      $regex = "(?si)(parent:(?<parent>.*?)(\n|\r)+.*?)(branch:(?<branch>.*)\s)(commit:(?<commit>.*)\s)(update:(?<update>.*))";
      $summary = [System.String]::Join([System.Environment]::NewLine,$summary)
      $res = $summary -match $regex
      $status = "hg {0} c:{1}" -f $matches["branch"].Trim(), $matches["commit"].Trim()
      return $status
   }
   else {
    return $false
   }
  }
 
  $status = getGitStatus
  if(-not $status) {
      $status = getHgStatus
  }
  $host.ui.rawui.WindowTitle = (get-location).Path
  if($status) {
    write-host ($status) -NoNewLine -ForegroundColor Green
    write-host (">") -NoNewLine -ForegroundColor Green
  }
  else {
    & $oldPrompt
  }
  return " "
}