Rename files without extension with AutoHotkey

Question

I am trying to add .pdf to the filename of files without extension in a folder.

It is possible to rename for example txt files to pdf using the following command:

FileMove, %SourceFolder%\*.txt, %SourceFolder%\*.pdf

Also, I can add .pdf to all files by:

FileMove, %SourceFolder%\*, %SourceFolder%\*.pdf

But I only want to target only the files without extension. How to do this?

Answer 1

Example

As suggested by kasper and MCL

SetWorkingDir %A_ScriptDir%

Loop, files\*
{
    if !StrLen(A_LoopFileExt) ; if no file extension
    {
        FileMove,%A_LoopFileFullPath%,%A_LoopFileFullPath%.pdf ;rename file
    }
}

see [Loop, FilePattern]
see [FileMove]