documentation added for taps maintainers

Closes Homebrew/homebrew#41858.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>
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Baptiste Fontaine 2015-07-18 14:07:13 +02:00
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# How to Create and Maintain a Tap
Taps are external sources of Homebrew formulae and/or external commands. They
can be created by anyone to provide their own formulae and/or external commands
to any Homebrew user.
## Creating a tap
A tap is usually a git repository available online, but you can use anything as
long as its a protocol that git understands, or even just a directory with
files in it.
If hosted on GitHub, we recommend that the repositorys name start with
`homebrew-`.
Tap formulae follow the same format as the cores ones, and can be added at the
repositorys root, or under `Formula` or `HomebrewFormula` subdirectories. We
recommend the latter options because it makes the repository organisation
easier to grasp, and top-level files are not mixed with formulae.
See [homebrew-tex](https://github.com/Homebrew/homebrew-tex) for an example of
a tap with a `Formula` subdirectory.
### Installing
If its on GitHub, users can install any of your formulae with
`brew install user/repo/formula`. Homebrew will automatically add your
`github.com/user/homebrew-repo` tap before installing the formula.
`user/repo/formula` points to the `github.com/user/homebrew-repo/**/formula.rb`
file here.
If they want to get your tap without installing any formula at the same time,
users can add it with the [`brew tap` command](brew-tap.md).
If its on GitHub, they can use `brew tap user/repo`, where `user` is your
GitHub username and `homebrew-repo` your repository.
If its hosted outside of GitHub, they have to use `brew tap user/repo <url>`,
where `user` and `repo` will be used to refer to your tap and `<url>` is your
Git clone URL.
Users can then install your formulae either with `brew install foo` if theres
no core formula with the same name, or with `brew install user/repo/foo` to
avoid conflicts.
## Maintaining a tap
A tap is just a git repository so you dont have to do anything specific when
making modifications apart from committing and pushing your changes.
### Updating
Once your tap installed, Homebrew will update it each time an user runs
`brew update`. Outdated formulae will be upgraded when an user runs
`brew upgrade`, like core formulae.
## External commands
You can provide your tap users with custom `brew` commands by adding them in a
`cmd` subdirectory. [Read more on external commands](External-Commands.md).
See [homebrew-aliases](https://github.com/Homebrew/homebrew-aliases) for an
example of a tap with external commands.