renamings.psm1

if (Get-Module renamings) { return }

<#
.SYNOPSIS
Add parent folder as prefix to all files matching $pattern

.DESCRIPTION
Recursively, from current directory, searches for all files matching the provided pattern.
It then renames those files so that the filename gets a prefix that is name of the parent
folder. It skipps all files that already have the parent folder name as a prefix.

.PARAMETER pattern
The file pattern to search for. ex. *.JPG

.EXAMPLE
#Add the parent directory as a prefix to all jpg files
Add-DirectoryPrefix *.JPG

.NOTES
It does recurse !!!!
#>
function Add-DirectoryPrefix($pattern) {
    # To debug, replace the Rename-Item with Select-Object
    Get-ChildItem -Path .\* -Filter $pattern -Recurse | 
        Where-Object {$_.Name -notlike ($_.Directory.Name + '*')} | 
        Rename-Item -NewName {$_.Directory.Name + '-' + $_.Name}
        # Select-Object -Property Directory,Name,@{Name = 'NewName'; Expression= {$_.Directory.Name + '-' + $_.Name}}
}

Export-ModuleMember -Function Add-DirectoryPrefix