how get buffer number occurrences : in what windows, and split mode of each occurrence.

Hello

I have something like this:

-------
|tab1|
-------------------------------------------------------------------------------------------------------------------------------------------------
|
file1.txt | file1.txt
|
|
|
|
-------------------------------------------------------------------------------------------------------------------------------------------------
file1.txt

-------------------------------------------------------------------------------------------------------------------------------------------------

I want to know, how i can get all file1.txt buffer numbers
occurrences : in what windows and split mode of each window. By other
words, how i can get information that file1.txt was opened in first
tab tree times, two vertical, one horizontal.

I need to collect this information to restore view with help of
winrestcmd function. (after closes all split windows and buffer,
restore it like it was before )

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