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docs: add livecheck formula/cask reference example

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Sam Ford 2021-07-24 21:13:22 -04:00
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@ -96,6 +96,18 @@ end
If tags include the software name as a prefix (e.g. `example-1.2.3`), it's easy to modify the regex accordingly: `/^example[._-]v?(\d+(?:\.\d+)+)$/i`
### Referenced formula/cask
A formula/cask can use the same check as another by using `formula` or `cask`.
```ruby
livecheck do
formula "another-formula"
end
```
The referenced formula/cask should be in the same tap, as a reference to a formula/cask from another tap will generate an error if the user doesn't already have it tapped.
### `strategy` blocks
If the upstream version format needs to be manipulated to match the formula/cask format, a `strategy` block can be used instead of a `regex`.