49 lines
1.8 KiB
Ruby
49 lines
1.8 KiB
Ruby
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# frozen_string_literal: true
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module Homebrew
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module Livecheck
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module Strategy
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# The `Hackage` strategy identifies versions of software at
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# hackage.haskell.org by checking directory listing pages.
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#
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# Hackage URLs take one of the following formats:
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# * `https://hackage.haskell.org/package/example-1.2.3/example-1.2.3.tar.gz`
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# * `https://downloads.haskell.org/~ghc/8.10.1/ghc-8.10.1-src.tar.xz`
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#
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# The default regex checks for the latest version an `h3` heading element
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# with a format like `<h3>example-1.2.3/</h3>`.
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#
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# @api public
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class Hackage
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# The `Regexp` used to determine if the strategy applies to the URL.
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URL_MATCH_REGEX = /(?:downloads|hackage)\.haskell\.org/i.freeze
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# Whether the strategy can be applied to the provided URL.
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# @param url [String] the URL to match against
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# @return [Boolean]
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def self.match?(url)
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URL_MATCH_REGEX.match?(url)
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end
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# Generates a URL and regex (if one isn't provided) and passes them
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# to the `PageMatch#find_versions` method to identify versions in the
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# content.
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# @param url [String] the URL of the content to check
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# @param regex [Regexp] a regex used for matching versions in content
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# @return [Hash]
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def self.find_versions(url, regex = nil)
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/^(?<package_name>.+?)-\d+/i =~ File.basename(url)
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# A page containing a directory listing of the latest source tarball
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page_url = "https://hackage.haskell.org/package/#{package_name}/src"
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# Example regex: `%r{<h3>example-(.*?)/?</h3>}i`
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regex ||= %r{<h3>#{Regexp.escape(package_name)}-(.*?)/?</h3>}i
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Homebrew::Livecheck::Strategy::PageMatch.find_versions(page_url, regex)
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end
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end
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end
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end
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end
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