Powershell script for dealing with running applications

gistfile1.ps1

function list-windows () {
  ps | ?{$_.mainwindowtitle} | select processname, mainwindowtitle | ft -a
}
set-alias lw list-windows

function levdis ($strA, $strB) {
	$n = $strA.Length;
	$m = $strB.Length;
	$d = @();

  for ($i = 0; $i -le $n; $i++) {
    $d += ,@();
    for ($j = 0; $j -le $n; $j++) {
      $d[$i] += -1;
    }
  }


	if ($n -eq 0) { return $m; }

	if ($m -eq 0) { return $n; }

	for ($i = 0; $i -le $n; $i++) {
    $d[$i][0] = $i;
  }

	for ($j = 0; $j -le $m; $j++) {
    $d[$j][0] = $j
  }

	for ($i = 1; $i -le $n; $i++)
	{
    for ($j = 1; $j -le $m; $j++)
    {
      if ($strB[$j - 1] -eq $strA[$i - 1]) { $cost = 0; }
      else { $cost = 1; }

      $d[$i][$j] = [math]::Min(
        [math]::Min($d[$i - 1][$j] + 1, $d[$i][$j - 1] + 1),
        $d[$i - 1][$j - 1] + $cost
      );
    }
	}

	return $d[$n][$m];
}

function focus-window ($query) {
  $windows = ps | ?{$_.mainwindowtitle}
  $windows | select mainwindowtitle, @{n='dis';e={levdis $_.mainwindowtitle $query}} | sort dis
}
set-alias fo focus-window