Git ignore except one file type

Question

I have a rule that ignores bin folder (build results):
[Bb]in/

I want git to still add all .txt files, even those in bin directory (but ignore everything else in that dir). How can I achieve this?

Answer 1

Cited from https://git-scm.com/docs/gitignore#_pattern_format

It is not possible to re-include a file if a parent directory of that file is excluded. Git doesn't list excluded directories for performance reasons, so ...

Answer 2

[Bb]in/*
!*.txt

This pattern should find you an answer. If you prepend the negation( ! ) before a pattern, it is marked as not to be ignored irrespective of all the ignores above it. Refer - https://www.atlassian.com/git/tutorials/gitignore