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docs/Formula-Cookbook: Requirements can have a minimum version

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And both dependencies and Requirements accept lists.
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EricFromCanada 2018-10-01 17:29:29 -04:00
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docs/Formula-Cookbook.md
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@ -133,7 +133,9 @@ class Foo < Formula
depends_on "jpeg"
depends_on "readline" => :recommended
depends_on "gtk+" => :optional
depends_on "httpd" => [:build, :test]
depends_on :x11 => :optional
depends_on :xcode => "9.3"
end
```
@ -141,24 +143,23 @@ A String (e.g. `"jpeg"`) specifies a formula dependency.
A Symbol (e.g. `:x11`) specifies a [`Requirement`](http://www.rubydoc.info/github/Homebrew/brew/master/Requirement) which can be fulfilled by one or more formulae, casks or other system-wide installed software (e.g. X11).
A Hash (e.g. `=>`) specifies a formula dependency with some additional information. Given a single string key, the value can take several forms:
A Hash (e.g. `=>`) adds information to a dependency. Given a String or Symbol, the value can be one or more of the following values:
* a Symbol (currently one of `:build`, `:test`, `:optional` or `:recommended`)
- `:build` means that dependency is a build-time only dependency so it can
* `:build` means that dependency is a build-time only dependency so it can
be skipped when installing from a bottle or when listing missing
dependencies using `brew missing`.
- `:test` means that dependency is only required when running `brew test`.
- `:optional` generates an implicit `with-foo` option for the formula.
* `:test` means that dependency is only required when running `brew test`.
* `:optional` generates an implicit `with-foo` option for the formula.
This means that, given `depends_on "foo" => :optional`, the user must pass `--with-foo` in order to use the dependency.
- `:recommended` generates an implicit `without-foo` option, meaning that
* `:recommended` generates an implicit `without-foo` option, meaning that
the dependency is enabled by default and the user must pass
`--without-foo` to disable this dependency. The default
description can be overridden using the normal option syntax (in this case, the option declaration must precede the dependency):
```ruby
option "with-foo", "Compile with foo bindings" # This overrides the generated description if you want to
depends_on "foo" => :optional # Generated description is "Build with foo support"
depends_on "foo" => :optional # Generated description would otherwise be "Build with foo support"
```
* Some [`Requirement`][6]s can also take a string specifying their minimum version that the formula depends on.
We frown on [`option`](http://www.rubydoc.info/github/Homebrew/brew/master/Formula#option-class_method)s in Homebrew/homebrew-core as they are not tested by CI.