mirror of
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76 lines
2.9 KiB
Ruby
76 lines
2.9 KiB
Ruby
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#: * `extract` [`--force`] [`--stdout`] <formula> <version> [<tap>]:
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#: Looks through repository history to find the <version> of <formula> and
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#: creates a copy in <tap>/Formula/<formula>@<version>.rb. If the tap is
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#: not installed yet, attempts to install/clone the tap before continuing.
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#:
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#: If `--force` is passed, the file at the destination will be overwritten
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#: if it already exists. Otherwise, existing files will be preserved.
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#:
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#: If `--stdout` is passed, the file will be written to stdout on the
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#: terminal instead of written to a file. A <tap> cannot be passed when
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#: using `--stdout`.
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require "utils/git"
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require "formula_versions"
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require "formulary"
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require "tap"
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module Homebrew
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module_function
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def extract
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Homebrew::CLI::Parser.parse do
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switch "--stdout", description: "Output to stdout on terminal instead of file"
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switch :debug
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switch :force
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end
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odie "Cannot use a tap and --stdout at the same time!" if ARGV.named.length == 3 && args.stdout?
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raise UsageError unless (ARGV.named.length == 3 && !args.stdout?) || (ARGV.named.length == 2 && args.stdout?)
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formula = Formulary.factory(ARGV.named.first)
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version = ARGV.named[1]
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destination_tap = Tap.fetch(ARGV.named[2]) unless args.stdout?
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destination_tap.install unless destination_tap.installed? unless args.stdout?
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unless args.stdout?
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path = Pathname.new("#{destination_tap.path}/Formula/#{formula}@#{version}.rb")
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if path.exist?
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unless ARGV.force?
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odie <<~EOS
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Destination formula already exists: #{path}
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To overwrite it and continue anyways, run `brew extract #{formula} #{version} #{destination_tap.name} --force`.
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EOS
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end
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ohai "Overwriting existing formula at #{path}" if ARGV.debug?
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path.delete
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end
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end
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rev = "HEAD"
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version_resolver = FormulaVersions.new(formula)
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until version_resolver.formula_at_revision(rev) { |f| version_matches?(f, version, rev) || rev.empty? } do
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rev = Git.last_revision_commit_of_file(formula.path.parent.parent, formula.path, before_commit: "#{rev}~1")
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end
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odie "Could not find #{formula} #{version}!" if rev.empty?
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result = version_resolver.file_contents_at_revision(rev)
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# The class name has to be renamed to match the new filename, e.g. Foo version 1.2.3 becomes FooAT123 and resides in Foo@1.2.3.rb.
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result.gsub!("class #{formula.name.capitalize} < Formula", "class #{formula.name.capitalize}AT#{version.gsub(/[^0-9a-z ]/i, "")} < Formula")
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if args.stdout?
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puts result if args.stdout?
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else
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ohai "Writing formula for #{formula} from #{rev} to #{path}"
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path.write result
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end
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end
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# @private
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def version_matches?(formula, version, rev)
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ohai "Trying #{formula.version} from revision #{rev} against desired #{version}" if ARGV.debug?
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formula.version == version
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end
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end
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