Using .gitignore to ignore everything but specific directories

Here's how I did it - you essentially have to walk up the paths, you can't wildcard more than one level in any direction:

# Ignore everything:
*

# Except for the themes directories:

!wordpress/
!wordpress/*/
!wordpress/*/wp-content/
!wordpress/*/wp-content/themes/
!wordpress/*/wp-content/themes/*
!wordpress/*/wp-content/themes/*/*
!wordpress/*/wp-content/themes/*/*/*
!wordpress/*/wp-content/themes/*/*/*/*
!wordpress/*/wp-content/themes/*/*/*/*/*

Notice how you have to explicitly allow content for each level you want to include. So if I have subdirectories 5 deep under themes, I still need to spell that out.

This is only how it worked for me. If someone cares to offer a more informed explanation by all means.

Also, these answers helpful:
how-do-negated-patterns-work-in-gitignore
how-do-gitignore-exclusion-rules-actually-work

---

NOTE: I tried using double-wildcard 'globs' but according to this that functionality is system dependent and it didn't work on my mac:

Did NOT work:

!**/wp-content/themes/
!**/wp-content/themes/**

modify the first line

*

change it to

/*

Try these answers:

Make .gitignore ignore everything except a few files

# Ignore everything
*

# But not these files...
!.gitignore
!script.pl
!template.latex
# etc...

# ...even if they are in subdirectories
!*/

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How do I tell Git to ignore everything except a subdirectory?

This ignores root files & root directories, then un-ignores the root bin directory:

/*
/*/
!/bin/

This way you get all of the bin directory, including subdirectories and their files.

I tried the above and they didn't work so well. A better approach is as follows from here: https://gist.github.com/444295

# This is a template .gitignore file for git-managed WordPress projects.
#
# Fact: you don't want WordPress core files, or your server-specific
# configuration files etc., in your project's repository. You just don't.
#
# Solution: stick this file up your repository root (which it assumes is
# also the WordPress root directory) and add exceptions for any plugins,
# themes, and other directories that should be under version control.
#
# See the comments below for more info on how to add exceptions for your
# content. Or see git's documentation for more info on .gitignore files:
# http://kernel.org/pub/software/scm/git/docs/gitignore.html

# Ignore everything in the root except the "wp-content" directory.
/*
!.gitignore
!wp-content/

# Ignore everything in the "wp-content" directory, except the "plugins"
# and "themes" directories.
wp-content/*
!wp-content/plugins/
!wp-content/themes/

# Ignore everything in the "plugins" directory, except the plugins you
# specify (see the commented-out examples for hints on how to do this.)
wp-content/plugins/*
# !wp-content/plugins/my-single-file-plugin.php
# !wp-content/plugins/my-directory-plugin/

# Ignore everything in the "themes" directory, except the themes you
# specify (see the commented-out example for a hint on how to do this.)
wp-content/themes/*
# !wp-content/themes/my-theme/