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

Inherits:
Object
  • Object
show all
Extended by:
T::Sig
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, cask: nil, &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)

    a regex used for matching versions in content

  • cask (Cask::Cask, nil) (defaults to: nil)
  • block (T.proc.params(arg0: String).returns(T.any(T::Array[String], String)), nil)

Returns:



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# File 'livecheck/strategy/cpan.rb', line 56

def self.find_versions(url, regex, cask: nil, &block)
  match = url.match(URL_MATCH_REGEX)

  # Use `\.t` instead of specific tarball extensions (e.g. .tar.gz)
  suffix = match[:suffix].sub(/\.t(?:ar\..+|[a-z0-9]+)$/i, "\.t")

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

  # Example regex: `/href=.*?Brew[._-]v?(\d+(?:\.\d+)*)\.t/i`
  regex ||= /href=.*?#{match[:prefix]}[._-]v?(\d+(?:\.\d+)*)#{Regexp.escape(suffix)}/i

  PageMatch.find_versions(page_url, regex, cask: cask, &block)
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 38

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