Class: Homebrew::Livecheck::Strategy::Hackage

Inherits:
Object
  • Object
show all
Defined in:
Library/Homebrew/livecheck/strategy/hackage.rb

Overview

The Hackage strategy identifies versions of software at hackage.haskell.org by checking directory listing pages.

Hackage URLs take one of the following formats:

  • https://hackage.haskell.org/package/example-1.2.3/example-1.2.3.tar.gz
  • https://downloads.haskell.org/~ghc/8.10.1/ghc-8.10.1-src.tar.xz

The default regex checks for the latest version in an h3 heading element with a format like <h3>example-1.2.3/</h3>.

Constant Summary collapse

URL_MATCH_REGEX =

The Regexp used to determine if the strategy applies to the URL.

/(?:downloads|hackage)\.haskell\.org/i.freeze

Class Method Summary collapse

Class Method Details

.find_versions(url, regex = nil) ⇒ Hash

Generates a URL and regex (if one isn't provided) and passes them to PageMatch.find_versions to identify versions in the content.

Parameters:

  • url (String)

    the URL of the content to check

  • regex (Regexp) (defaults to: nil)

    a regex used for matching versions in content

Returns:

  • (Hash)

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# File 'Library/Homebrew/livecheck/strategy/hackage.rb', line 37

def self.find_versions(url, regex = nil)
  /^(?<package_name>.+?)-\d+/i =~ File.basename(url)

  # A page containing a directory listing of the latest source tarball
  page_url = "https://hackage.haskell.org/package/#{package_name}/src"

  # Example regex: `%r{<h3>example-(.*?)/?</h3>}i`
  regex ||= %r{<h3>#{Regexp.escape(package_name)}-(.*?)/?</h3>}i

  Homebrew::Livecheck::Strategy::PageMatch.find_versions(page_url, regex)
end

.match?(url) ⇒ Boolean

Whether the strategy can be applied to the provided URL.

Parameters:

  • url (String)

    the URL to match against

Returns:

  • (Boolean)

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# File 'Library/Homebrew/livecheck/strategy/hackage.rb', line 27

def self.match?(url)
  URL_MATCH_REGEX.match?(url)
end