Class: Homebrew::Livecheck::Strategy::Cpan

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

Overview

The Cpan strategy identifies versions of software at cpan.metacpan.org by checking directory listing pages.

CPAN URLs take the following formats:

  • https://cpan.metacpan.org/authors/id/H/HO/HOMEBREW/Brew-v1.2.3.tar.gz
  • https://cpan.metacpan.org/authors/id/H/HO/HOMEBREW/brew/brew-v1.2.3.tar.gz

In these examples, HOMEBREW is the author name and the preceding H and HO directories correspond to the first letter(s). Some authors also store files in subdirectories, as in the second example above.

Constant Summary collapse

NICE_NAME = 
"CPAN"
URL_MATCH_REGEX =

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

%r{
  ^https?://cpan\.metacpan\.org
  (?<path>/authors/id(?:/[^/]+){3,}/) # Path before the filename
  (?<prefix>[^/]+) # Filename text before the version
  -v?\d+(?:\.\d+)* # The numeric version
  (?<suffix>[^/]+) # Filename text after the version
}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/cpan.rb', line 84

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/cpan.rb', line 49

def self.generate_input_values(url)
  values = {}

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

  # The directory listing page where the archive files are found
  values[:url] = "https://cpan.metacpan.org#{match[:path]}"

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

  # Use `\.t` instead of specific tarball extensions (e.g. .tar.gz)
  suffix = T.must(match[:suffix]).sub(Strategy::TARBALL_EXTENSION_REGEX, ".t")
  regex_suffix = Regexp.escape(suffix).gsub("\\-", "-")

  # Example regex: `/href=.*?Brew[._-]v?(\d+(?:\.\d+)*)\.t/i`
  values[:regex] = /href=.*?#{regex_prefix}[._-]v?(\d+(?:\.\d+)*)#{regex_suffix}/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/cpan.rb', line 37

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