externalLibs/Carbon/Carbon/Path/Resolve-PathCase.ps1
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# Copyright 2012 Aaron Jensen # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function Resolve-PathCase { <# .SYNOPSIS Returns the real, canonical case of a path. .DESCRIPTION The .NET and Windows path/file system APIs respect and preserve the case of paths passed to them. This function will return the actual case of a path on the file system, regardless of the case of the string passed in. If the path doesn't an exist, an error is written and nothing is returned. .EXAMPLE Resolve-PathCase -Path "C:\WINDOWS\SYSTEM32" Returns `C:\Windows\system32`. .EXAMPLE Resolve-PathCase -Path 'c:\projects\carbon' Returns `C:\Projects\Carbon`. #> [CmdletBinding()] param( [Parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)] [string] # The path whose real, canonical case should be returned. [Alias('FullName')] $Path ) if( -not (Test-Path -Path $Path) ) { Write-Error "Path '$Path' not found." return } $uri = [uri]$Path if( $uri.IsUnc ) { Write-Error ('Path ''{0}'' is a UNC path, which is not supported.' -f $Path) return } if( -not ([IO.Path]::IsPathRooted($Path)) ) { $Path = (Resolve-Path -Path $Path).Path } $qualifier = '{0}\' -f (Split-Path -Qualifier -Path $Path) $qualifier = Get-Item -Path $qualifier | Select-Object -ExpandProperty 'Name' $canonicalPath = '' do { $parent = Split-Path -Parent -Path $Path $leaf = Split-Path -Leaf -Path $Path $canonicalLeaf = Get-ChildItem -Path $parent -Filter $leaf if( $canonicalPath ) { $canonicalPath = Join-Path -Path $canonicalLeaf -ChildPath $canonicalPath } else { $canonicalPath = $canonicalLeaf } } while( $parent -ne $qualifier -and ($Path = Split-Path -Parent -Path $Path) ) return Join-Path -Path $qualifier -ChildPath $canonicalPath } Set-Alias -Name 'Get-PathCanonicalCase' -Value 'Resolve-PathCase' |