PowerShell scripts

FileNameUtils.psm1

# Import-Module .\FileNameUtils.psm1

function Rename-FilesToSHA {
    [CmdletBinding()]
    Param(
    [ValidateScript({ Test-Path $_ })]
    $Path
    )

    $hasher = [System.Security.Cryptography.HashAlgorithm]::Create('SHA1')
    $files = Get-ChildItem $Path -Recurse | Where-Object {-not $_.PSIsContainer}

    foreach ($file in $files) {
        $hasMatch = $file.Name -match '(.+?)(\.[a-f0-9]{8})?(\.[^\.]*)$'

        if ($hasMatch)
        {
            $fs = New-Object IO.FileStream($file.FullName, 'Open')
            $sb = New-Object System.Text.StringBuilder

            [void]$sb.Append($Matches.1)
            [void]$sb.Append('.')

            $hasher.ComputeHash($fs) | Select-Object -First 4 | ForEach-Object { [void]$sb.Append($_.ToString("x2")) }
            [void]$sb.Append($Matches.3)

            $fs.Close()

            $file | Rename-Item -NewName $sb.ToString()
        }
    }
}

Where-Wildcard.ps1

Function Where-Wildcard
{
    Param (
      [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$false )] [string]$FilterString,
      [Parameter(ValueFromPipeline=$true)] [System.IO.FileSystemInfo]$input
    )

    $match = ([Regex]::Escape($FilterString) -replace '\\\*\\\*', '{dir_wildcard}' -replace '\\\*', '{file_wildcard}' -replace '{dir_wildcard}', '.*' -replace '{file_wildcard}', '[^\\/]*') + '$'
    $input | ? { $_.FullName -imatch $match }
}