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Add cask instructions to tap docs

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Loosely based on (now deleted) 4c72606867/doc/alternate_cask_taps.md
Cask naming issues are from experimentation.
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Thomas Andrew 2019-10-05 13:27:17 +01:00
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docs/How-to-Create-and-Maintain-a-Tap.md
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# How to Create and Maintain a Tap
[Taps](Taps.md) 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
[Taps](Taps.md) are external sources of Homebrew formulae, casks and/or external commands. They
can be created by anyone to provide their own formulae, casks and/or external commands
to any Homebrew user.
## Creating a tap
@ -58,6 +58,19 @@ Once your tap is installed, Homebrew will update it each time a user runs
`brew update`. Outdated formulae will be upgraded when a user runs
`brew upgrade`, like core formulae.
## Casks
Casks can also be installed from a tap.
Casks can be included in taps with formulae, or in a tap with just casks.
Place any cask files you wish to make available in a `Casks` directory at the top level of your tap.
See [homebrew/cask](https://github.com/Homebrew/homebrew-cask) for an example of a tap with a `Casks` subdirectory.
### Naming
Unlike formulae, casks must have globally unique names to avoid clashes.
This can be achieved by e.g. prepending the cask name with you github username: `username-formula-name`.
## External commands
You can provide your tap users with custom `brew` commands by adding them in a