Module: Formulary

Extended by:
Cachable
Defined in:
Library/Homebrew/formulary.rb

Overview

The Formulary is responsible for creating instances of Formula. It is not meant to be used directly from formulae.

Defined Under Namespace

Classes: AliasLoader, BottleLoader, FormulaContentsLoader, FormulaLoader, FromPathLoader, FromUrlLoader, NullLoader, TapLoader

Class Method Summary collapse

Methods included from Cachable

cache, clear_cache

Class Method Details

.canonical_name(ref) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 341

def self.canonical_name(ref)
  loader_for(ref).name
rescue TapFormulaAmbiguityError  # If there are multiple tap formulae with the name of ref,
  # then ref is the canonical name

  ref.downcase
end

.class_s(name) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 61

def self.class_s(name)
  class_name = name.capitalize
  class_name.gsub!(/[-_.\s]([a-zA-Z0-9])/) { Regexp.last_match(1).upcase }
  class_name.tr!("+", "x")
  class_name.sub!(/(.)@(\d)/, "\\1AT\\2")
  class_name
end

.core_path(name) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 421

def self.core_path(name)
  CoreTap.instance.formula_dir/"#{name.to_s.downcase}.rb"
end

.ensure_utf8_encoding(io) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 52

def self.ensure_utf8_encoding(io)
  io.set_encoding(Encoding::UTF_8)
end

.factory(ref, spec = :stable, alias_path: nil, from: nil) ⇒ Object

Return a Formula instance for the given reference. `ref` is string containing:

  • a formula name

  • a formula pathname

  • a formula URL

  • a local bottle reference


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# File 'Library/Homebrew/formulary.rb', line 279

def self.factory(ref, spec = :stable, alias_path: nil, from: nil)
  loader_for(ref, from: from).get_formula(spec, alias_path: alias_path)
end

.find_with_priority(ref, spec = :stable) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 437

def self.find_with_priority(ref, spec = :stable)
  possible_pinned_tap_formulae = tap_paths(ref, Dir["#{HOMEBREW_LIBRARY}/PinnedTaps/*/*/"]).map(&:realpath)
  if possible_pinned_tap_formulae.size > 1
    raise TapFormulaAmbiguityError.new(ref, possible_pinned_tap_formulae)
  end

  if possible_pinned_tap_formulae.size == 1
    selected_formula = factory(possible_pinned_tap_formulae.first, spec)
    if core_path(ref).file?
      opoo <<~EOS
        #{ref} is provided by core, but is now shadowed by #{selected_formula.full_name}.
        To refer to the core formula, use Homebrew/core/#{ref} instead.
      EOS
    end
    selected_formula
  else
    factory(ref, spec)
  end
end

.formula_class_defined?(path) ⇒ Boolean 


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# File 'Library/Homebrew/formulary.rb', line 11

def self.formula_class_defined?(path)
  cache.key?(path)
end

.formula_class_get(path) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 15

def self.formula_class_get(path)
  cache.fetch(path)
end

.from_contents(name, path, contents, spec = :stable) ⇒ Object

Return a Formula instance directly from contents


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# File 'Library/Homebrew/formulary.rb', line 324

def self.from_contents(name, path, contents, spec = :stable)
  FormulaContentsLoader.new(name, path, contents).get_formula(spec)
end

.from_keg(keg, spec = nil, alias_path: nil) ⇒ Object

Return a Formula instance for the given keg. It will auto resolve formula's spec when requested spec is nil


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# File 'Library/Homebrew/formulary.rb', line 302

def self.from_keg(keg, spec = nil, alias_path: nil)
  tab = Tab.for_keg(keg)
  tap = tab.tap
  spec ||= tab.spec

  f = if tap.nil?
    factory(keg.rack.basename.to_s, spec, alias_path: alias_path, from: :keg)
  else
    begin
      factory("#{tap}/#{keg.rack.basename}", spec, alias_path: alias_path, from: :keg)
    rescue FormulaUnavailableError      # formula may be migrated to different tap. Try to search in core and all taps.

      factory(keg.rack.basename.to_s, spec, alias_path: alias_path, from: :keg)
    end
  end
  f.build = tab
  f.build.used_options = Tab.remap_deprecated_options(f.deprecated_options, tab.used_options).as_flags
  f.version.update_commit(keg.version.version.commit) if f.head? && keg.version.head?
  f
end

.from_rack(rack, spec = nil, alias_path: nil) ⇒ Object

Return a Formula instance for the given rack. It will auto resolve formula's spec when requested spec is nil

The :alias_path option will be used if the formula is found not to be installed, and discarded if it is installed because the alias_path used to install the formula will be set instead.


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# File 'Library/Homebrew/formulary.rb', line 289

def self.from_rack(rack, spec = nil, alias_path: nil)
  kegs = rack.directory? ? rack.subdirs.map { |d| Keg.new(d) } : []
  keg = kegs.detect(&:linked?) || kegs.detect(&:optlinked?) || kegs.max_by(&:version)

  if keg
    from_keg(keg, spec, alias_path: alias_path)
  else
    factory(rack.basename.to_s, spec || :stable, alias_path: alias_path, from: :rack)
  end
end

.load_formula(name, path, contents, namespace) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 19

def self.load_formula(name, path, contents, namespace)
  if ENV["HOMEBREW_DISABLE_LOAD_FORMULA"]
    raise "Formula loading disabled by HOMEBREW_DISABLE_LOAD_FORMULA!"
  end

  mod = Module.new
  const_set(namespace, mod)
  begin
    mod.module_eval(contents, path)
  rescue ScriptError => e
    raise FormulaUnreadableError.new(name, e)
  end
  class_name = class_s(name)

  begin
    mod.const_get(class_name)
  rescue NameError => original_exception
    class_list = mod.constants
                    .map { |const_name| mod.const_get(const_name) }
                    .select { |const| const.is_a?(Class) }
    e = FormulaClassUnavailableError.new(name, path, class_name, class_list)
    raise e, "", original_exception.backtrace
  end
end

.load_formula_from_path(name, path) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 44

def self.load_formula_from_path(name, path)
  contents = path.open("r") { |f| ensure_utf8_encoding(f).read }
  namespace = "FormulaNamespace#{Digest::MD5.hexdigest(path.to_s)}"
  klass = load_formula(name, path, contents, namespace)
  cache[path] = klass
end

.loader_for(ref, from: nil) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 353

def self.loader_for(ref, from: nil)
  case ref
  when Pathname::BOTTLE_EXTNAME_RX
    return BottleLoader.new(ref)
  when %r{(https?|ftp|file)://}
    return FromUrlLoader.new(ref)
  when HOMEBREW_TAP_FORMULA_REGEX
    return TapLoader.new(ref, from: from)
  end

  if File.extname(ref) == ".rb" && Pathname.new(ref).expand_path.exist?
    return FromPathLoader.new(ref)
  end

  formula_with_that_name = core_path(ref)
  if formula_with_that_name.file?
    return FormulaLoader.new(ref, formula_with_that_name)
  end

  possible_alias = CoreTap.instance.alias_dir/ref
  return AliasLoader.new(possible_alias) if possible_alias.file?

  possible_tap_formulae = tap_paths(ref)
  if possible_tap_formulae.size > 1
    raise TapFormulaAmbiguityError.new(ref, possible_tap_formulae)
  end

  if possible_tap_formulae.size == 1
    path = possible_tap_formulae.first.resolved_path
    name = path.basename(".rb").to_s
    return FormulaLoader.new(name, path)
  end

  if newref = CoreTap.instance.formula_renames[ref]
    formula_with_that_oldname = core_path(newref)
    if formula_with_that_oldname.file?
      return FormulaLoader.new(newref, formula_with_that_oldname)
    end
  end

  possible_tap_newname_formulae = []
  Tap.each do |tap|
    if newref = tap.formula_renames[ref]
      possible_tap_newname_formulae << "#{tap.name}/#{newref}"
    end
  end

  if possible_tap_newname_formulae.size > 1
    raise TapFormulaWithOldnameAmbiguityError.new(ref, possible_tap_newname_formulae)
  end

  unless possible_tap_newname_formulae.empty?
    return TapLoader.new(possible_tap_newname_formulae.first, from: from)
  end

  possible_keg_formula = Pathname.new("#{HOMEBREW_PREFIX}/opt/#{ref}/.brew/#{ref}.rb")
  if possible_keg_formula.file?
    return FormulaLoader.new(ref, possible_keg_formula)
  end

  possible_cached_formula = Pathname.new("#{HOMEBREW_CACHE_FORMULA}/#{ref}.rb")
  if possible_cached_formula.file?
    return FormulaLoader.new(ref, possible_cached_formula)
  end

  NullLoader.new(ref)
end

.path(ref) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 349

def self.path(ref)
  loader_for(ref).path
end

.tap_paths(name, taps = Dir[HOMEBREW_LIBRARY/"Taps/*/*/"]) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 425

def self.tap_paths(name, taps = Dir[HOMEBREW_LIBRARY/"Taps/*/*/"])
  name = name.to_s.downcase
  taps.map do |tap|
    Pathname.glob([
                    "#{tap}Formula/#{name}.rb",
                    "#{tap}HomebrewFormula/#{name}.rb",
                    "#{tap}#{name}.rb",
                    "#{tap}Aliases/#{name}",
                  ]).detect(&:file?)
  end.compact
end

.to_rack(ref) ⇒ Object 


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# File 'Library/Homebrew/formulary.rb', line 328

def self.to_rack(ref)
  # If using a fully-scoped reference, check if the formula can be resolved.
  factory(ref) if ref.include? "/"

  # Check whether the rack with the given name exists.
  if (rack = HOMEBREW_CELLAR/File.basename(ref, ".rb")).directory?
    return rack.resolved_path
  end

  # Use canonical name to locate rack.
  (HOMEBREW_CELLAR/canonical_name(ref)).resolved_path
end