Ttyjfyk

I'm trying to use vidir from the moreutils package and I have the following issue:
When I load the files I want to rename with vidir like this:

$ vidir

or like this:

$ find -type f | vidir --verbose -

vidir displays a number, a tab, and the full path of the files like this:

1 ./file1
2 ./file2
3 ./file3

or if it isn't the current folder like this:

1 ./folder/subfolder1/file1
2 ./folder/subfolder1/file2
3 ./folder/subfolder1/file3

Now, I see some advantages in this like the ability to swap file names by swaping the numbers or editing folder names but I just want to rename the files in the same folder and maybe delete some files. My issue is when I use regex to rename the filenames everything could be affected,namely the numbers, the slashes, the dots and the tabs. I tried to remove them at start make my modifications and then rebuild them but vidir complains when I save the file and close the editor.

So how could circumvent this issue? Am I missing something?

EDIT:
I tried again to remove the vidir prefix before I start my modifications and add it back when I'm finished and it seems to be working. So in Vim:

: % s/d*t.//

to remove the prefix

and with:

:% s/^/t./
:'<,'>s/^/=(line('.')-line("'<")+1)/

to add the vidir prefix back.

The last line for adding the numbers I found here:

https://stackoverflow.com/questions/252766/add-line-numbers-to-source-code-in-vim

Now I want to add these lines in functions and I'm stuck at this line:

 :'<,'>s/^/=(line('.')-line("'<")+1)/

there seems to be an issue with the quotes and it doesn't work any more. When I put it within quotes I get an error. Could someone tell me what's going on?
This is the function I have:

" Add vidir prefix
function! AddVidirPrefix()
 execute '% s/^/t./'
 "execute 'normal! ggVG'
 execute '<,'>s/^/=(line('.')-line("'<")+1)/
endfunction