Class: Homebrew::Livecheck::Strategy::Gnu

Inherits:
Object
  • Object
show all
Defined in:
livecheck/strategy/gnu.rb

Overview

The Gnu strategy identifies versions of software at gnu.org by checking directory listing pages.

GNU URLs use a variety of formats:

  • Archive file URLs:
    • https://ftp.gnu.org/gnu/example/example-1.2.3.tar.gz
    • https://ftp.gnu.org/gnu/example/1.2.3/example-1.2.3.tar.gz
  • Homepage URLs:
    • https://www.gnu.org/software/example/
    • https://example.gnu.org

There are other URL formats that this strategy currently doesn’t support:

  • https://ftp.gnu.org/non-gnu/example/source/feature/1.2.3/example-1.2.3.tar.gz
  • https://savannah.nongnu.org/download/example/example-1.2.3.tar.gz
  • https://download.savannah.gnu.org/releases/example/example-1.2.3.tar.gz
  • https://download.savannah.nongnu.org/releases/example/example-1.2.3.tar.gz

The default regex identifies versions in archive files found in href attributes.

Constant Summary collapse

NICE_NAME = 
"GNU"
URL_MATCH_REGEX =

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

%r{
  ^https?://
  (?:(?:[^/]+?\.)*gnu\.org/(?:gnu|software)/(?<project_name>[^/]+)/
  |(?<project_name>[^/]+)\.gnu\.org/?$)
}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 (Proc, nil)

Returns:



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# File 'livecheck/strategy/gnu.rb', line 96

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

  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/gnu.rb', line 58

def self.generate_input_values(url)
  values = {}

  match = url.match(URL_MATCH_REGEX)
  return values if match.blank?

  # The directory listing page for the project's files
  values[:url] = "https://ftp.gnu.org/gnu/#{match[:project_name]}/"

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

  # The default regex consists of the following parts:
  # * `href=.*?`: restricts matching to URLs in `href` attributes
  # * The project name
  # * `[._-]`: the generic delimiter between project name and version
  # * `v?(\d+(?:\.\d+)*)`: the numeric version
  # * `(?:\.[a-z]+|/)`: the file extension (a trailing delimiter)
  #
  # Example regex: `%r{href=.*?example[._-]v?(\d+(?:\.\d+)*)(?:\.[a-z]+|/)}i`
  values[:regex] = %r{href=.*?#{regex_name}[._-]v?(\d+(?:\.\d+)*)(?:\.[a-z]+|/)}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/gnu.rb', line 46

def self.match?(url)
  URL_MATCH_REGEX.match?(url) && url.exclude?("savannah.")
end