Expanding Includes in .gitignore

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I want a feature. It may be a bad-idea(tm). Advice appreciated.

I want git to be able to include, in its gitignore files, sub-files of
ignores or have it understand a directory of ignore files. Or both.

The use case for this is where I did not write my own rules, but I want
to keep them updated. https://github.com/github/gitignore is a damn good
resource, but I want to pull it and include relevant bits project by
project and/or system wide. I don't want to have to update many projects
manually if that, or any other, repo changes.

A very brief look at dir.c would indicate that a recursive call from
add_excludes to itself when it parses some sort of include tag would do
it within a file. I'm sure it'd be pretty straight forward to hook into
something in dir.c to parse directories too.

I'm thinking something like ". path/to/include/file" in an ignore file,
and/or creating .gitignore.d and/or allowing $HOME/.config/git/ignore
and $GIT_DIR/info/exclude to be directories. Or some sane and consistent
mixture of these things.

In the case of a directory the plan would be to add links to files
stored/sourced elsewhere. This does pose a precedence question which I
haven't thought about yet, but probably makes it too hard for the
limited value it brings.

There is also the issue of malicious/accidental recursion which I
haven't thought about deeply either.

I would like to know the desirability/practicality/stupidity of such a
feature as I believe it is within my skillset to implement it.



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