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

Inherits:
Object
  • Object
show all
Defined in:
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

PACKAGE_NAME_REGEX =

A Regexp used in determining if the strategy applies to the URL and also as part of extracting the package name from the URL basename.

/(?<package_name>.+?)-\d+/i.freeze
FILENAME_REGEX =

A Regexp used to extract the package name from the URL basename.

/^#{PACKAGE_NAME_REGEX.source.strip}/i.freeze
URL_MATCH_REGEX =

A Regexp used in determining if the strategy applies to the URL.

%r{
  ^https?://(?:downloads|hackage)\.haskell\.org
  (?:/[^/]+)+ # Path before the filename
  #{PACKAGE_NAME_REGEX.source.strip}
}ix.freeze

Class Method Summary collapse

Class Method Details

.find_versions(url:, regex: nil, **unused, &block) ⇒ Hash{Symbol => T.untyped}

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, nil) (defaults to: nil) —

    a regex used for matching versions in content

  • unused (Hash{Symbol => T.untyped}, nil)
  • block (T.untyped)

Returns:



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# File 'livecheck/strategy/hackage.rb', line 84

def self.find_versions(url:, regex: nil, **unused, &block)
  generated = generate_input_values(url)

  T.unsafe(PageMatch).find_versions(url: generated[:url], regex: regex || generated[:regex], **unused, &block)
end

.generate_input_values(url) ⇒ Hash{Symbol => T.untyped}

Extracts information from a provided URL and uses it to generate various input values used by the strategy to check for new versions. Some of these values act as defaults and can be overridden in a livecheck block.

Parameters:

  • url (String) —

    the URL used to generate values

Returns:



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# File 'livecheck/strategy/hackage.rb', line 53

def self.generate_input_values(url)
  values = {}

  match = File.basename(url).match(FILENAME_REGEX)
  return values if match.blank?

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

  regex_name = Regexp.escape(T.must(match[:package_name])).gsub("\\-", "-")

  # Example regex: `%r{<h3>example-(.*?)/?</h3>}i`
  values[:regex] = %r{<h3>#{regex_name}-(.*?)/?</h3>}i

  values
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 'livecheck/strategy/hackage.rb', line 41

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