public/Get-Up.ps1
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<#
.SYNOPSIS Gets the path of an ancestor directory, either by name or by traversing upwards by the given number of levels. .PARAMETER n Number of levels above the starting location. (One by default.) .PARAMETER NamePart Partial directory name for which to search. .PARAMETER From The directory from which to start. $PWD by default. .EXAMPLE C:\Windows\System32> Get-Up C:\Windows C:\Windows\System32> _ .EXAMPLE C:\Windows\System32\drivers\etc> Get-Up 2 C:\Windows\System32 C:\Windows\System32\drivers\etc> _ .EXAMPLE C:\Windows\System32\drivers\etc> Get-Up win C:\Windows C:\Windows\System32\drivers\etc> _ .LINK Undo-Location #> function Get-Up { [CmdletBinding(DefaultParameterSetName = 'levels')] param( [Parameter(ParameterSetName = 'levels', Position = 0)] [byte]$n = 1, [Parameter(ParameterSetName = 'named', Position = 0)] [string]$NamePart, [string] $From = $PWD ) $next = $From | Resolve-Path try { if ($PSCmdlet.ParameterSetName -eq 'levels' -and $n -ge 1) { 1..$n | % { if ($parent = $next | Split-Path -Parent) { $next = $parent } } return $next } if ($PSCmdlet.ParameterSetName -eq 'named') { if ($next.Drive.Root -eq $NamePart) { return $NamePart } while ($next = $next | Split-Path -Parent) { if (($next | Split-Path -Leaf) -match (NormaliseAndEscape $NamePart)) { return $next } } # if we couldn't match by leaf name then match by complete path # this is only really used for completion when MenuCompletion is off $next = $From | Resolve-Path | select -Expand Path $resolvedTarget = Resolve-Path $NamePart -ErrorAction Ignore | Select -Expand Path do { if ($next -eq $resolvedTarget) { return $next } } while ($next = $next | Split-Path -Parent) } } catch [Management.Automation.PSArgumentException] { WriteLog "$_" $Global:Error.RemoveAt(0) } Write-Error "Could not find '$NamePart' as an ancestor of the given path." -ErrorAction Stop } |