Quickly navigate into local repository subdirectories with tab completion for the repository names.

Set-RepoLocation.ps1

$env:REPOS_PATH='C:\Source\Repos'
function Set-RepoLocation ($name) {
    Set-Location $(Join-Path $env:REPOS_PATH $name)
}

Set-Alias cdr Set-RepoLocation

Register-ArgumentCompleter -CommandName @('Set-RepoLocation', 'cdr') -ParameterName 'name' -ScriptBlock {
    param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameters)

     # Determine if we are searching the root or a sub-directory
     $lastSlash = $wordToComplete.LastIndexOf('\')
     if ($lastSlash -ge 0) {
         $parentPath = $wordToComplete.Substring(0, $lastSlash)
         $leafPart   = $wordToComplete.Substring($lastSlash + 1)
         $searchDir  = Join-Path $env:REPOS_PATH $parentPath
         $prefix     = "$parentPath\"
     } else {
         $parentPath = ""
         $leafPart   = $wordToComplete
         $searchDir  = $env:REPOS_PATH
         $prefix     = ""
     }

     # Only attempt to list if the target directory actually exists
     if (Test-Path $searchDir) {
         Get-ChildItem -Path $searchDir -Directory |
             Where-Object { $_.Name -like "$leafPart*" } |
             ForEach-Object { "$prefix$($_.Name)" }
     }
}