[Powershell] Tesseract auto-convert from folder

# TODO:
# - parse .pdf
# - convert to .pdf even if OCRing not working

$scan_dir      = 'C:\Users\LENOVO-PAWEL\Desktop\SKAN\'
$tesseract_exe = "C:\Program Files\Tesseract-OCR\tesseract.exe"
$source_dir    = "$scan_dir\source"
$converted_dir = "$scan_dir\converted"

if ( Test-Path "$source_dir" -PathType Container )
{ echo "Directory for source file exist" }
else
{
    mkdir -p "$source_dir"
    echo "Directory for source files created"
}
if ( Test-Path "$converted_dir" -PathType Container )
{ echo "Directory for converted files exist" }
else
{
    mkdir -p "$converted_dir"
    echo "Directory for converted files created"
}

function monitor {
    C:\drukarki\inotifywait.exe -m --format '%w\%f' -e modify "$scan_dir"
}
function convert {
    process {
        $source_file = $_
        $ext = [System.IO.Path]::GetExtension("$_")
        if ($ext -match "[.]tif$") {
            $output_file = $source_file
            $output_file = $output_file -replace "[.]tif$", ""
            echo "File to be OCRed = '$source_file' [ extension '$ext' ]"
            &$tesseract_exe "$source_file" "$output_file" pdf
            if ($LASTEXITCODE -eq 0){
                echo "Convertion is succesful '$output_file.pdf'"
                mv "$output_file" "$source_dir"
                mv "$output_file.pdf" "$converted_dir"
            }
            else
            {
                echo "Conversion failed! '$source_file'"
            }
        }
        else
        {
            echo "File is not in TIFF format! $_"
        }

    }
}
monitor | convert