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require "dependable"
require "dependency"
require "dependencies"
require "build_environment"
# A base class for non-formula requirements needed by formulae.
# A "fatal" requirement is one that will fail the build if it is not present.
# By default, Requirements are non-fatal.
class Requirement
include Dependable
attr_reader :tags, :name, :cask, :download
def initialize(tags = [])
@cask ||= self.class.cask
@download ||= self.class.download
tags.each do |tag|
next unless tag.is_a? Hash
@cask ||= tag[:cask]
@download ||= tag[:download]
end
@tags = tags
@tags << :build if self.class.build
@name ||= infer_name
end
def option_names
[name]
end
# The message to show when the requirement is not met.
def message
_, _, class_name = self.class.to_s.rpartition "::"
s = "#{class_name} unsatisfied!\n"
if cask
s += <<~EOS
You can install with Homebrew-Cask:
brew cask install #{cask}
EOS
end
if download
s += <<~EOS
You can download from:
#{download}
EOS
end
s
end
# Overriding #satisfied? is unsupported.
# Pass a block or boolean to the satisfy DSL method instead.
def satisfied?
satisfy = self.class.satisfy
return true unless satisfy
@satisfied_result = satisfy.yielder { |p| instance_eval(&p) }
return false unless @satisfied_result
true
end
# Overriding #fatal? is unsupported.
# Pass a boolean to the fatal DSL method instead.
def fatal?
self.class.fatal || false
end
def satisfied_result_parent
return unless @satisfied_result.is_a?(Pathname)
parent = @satisfied_result.resolved_path.parent
if parent.to_s =~ %r{^#{Regexp.escape(HOMEBREW_CELLAR)}/([\w+-.@]+)/[^/]+/(s?bin)/?$}
parent = HOMEBREW_PREFIX/"opt/#{Regexp.last_match(1)}/#{Regexp.last_match(2)}"
end
parent
end
# Overriding #modify_build_environment is unsupported.
# Pass a block to the env DSL method instead.
def modify_build_environment
satisfied?
instance_eval(&env_proc) if env_proc
# XXX If the satisfy block returns a Pathname, then make sure that it
# remains available on the PATH. This makes requirements like
# satisfy { which("executable") }
# work, even under superenv where "executable" wouldn't normally be on the
# PATH.
parent = satisfied_result_parent
return unless parent
return if ["#{HOMEBREW_PREFIX}/bin", "#{HOMEBREW_PREFIX}/bin"].include?(parent.to_s)
return if PATH.new(ENV["PATH"]).include?(parent.to_s)
ENV.prepend_path("PATH", parent)
end
def env
self.class.env
end
def env_proc
self.class.env_proc
end
def ==(other)
instance_of?(other.class) && name == other.name && tags == other.tags
end
alias eql? ==
def hash
name.hash ^ tags.hash
end
def inspect
"#<#{self.class.name}: #{name.inspect} #{tags.inspect}>"
end
def display_s
name
end
private
def infer_name
klass = self.class.name || self.class.to_s
klass.sub!(/(Dependency|Requirement)$/, "")
klass.sub!(/^(\w+::)*/, "")
klass.downcase
end
def which(cmd)
super(cmd, PATH.new(ORIGINAL_PATHS))
end
def which_all(cmd)
super(cmd, PATH.new(ORIGINAL_PATHS))
end
class << self
include BuildEnvironment::DSL
attr_reader :env_proc, :build
attr_rw :fatal, :cask, :download
def default_formula(_val = nil)
odeprecated "Requirement.default_formula"
end
def satisfy(options = nil, &block)
return @satisfied if options.nil? && !block_given?
options = {} if options.nil?
@satisfied = Requirement::Satisfier.new(options, &block)
end
def env(*settings, &block)
if block_given?
@env_proc = block
else
super
end
end
end
class Satisfier
def initialize(options, &block)
case options
when Hash
@options = { build_env: true }
@options.merge!(options)
else
@satisfied = options
end
@proc = block
end
def yielder
if instance_variable_defined?(:@satisfied)
@satisfied
elsif @options[:build_env]
require "extend/ENV"
ENV.with_build_environment { yield @proc }
else
yield @proc
end
end
end
class << self
# Expand the requirements of dependent recursively, optionally yielding
# [dependent, req] pairs to allow callers to apply arbitrary filters to
# the list.
# The default filter, which is applied when a block is not given, omits
# optionals and recommendeds based on what the dependent has asked for.
def expand(dependent, &block)
reqs = Requirements.new
formulae = dependent.recursive_dependencies.map(&:to_formula)
formulae.unshift(dependent)
formulae.each do |f|
f.requirements.each do |req|
next if prune?(f, req, &block)
reqs << req
end
end
reqs
end
def prune?(dependent, req, &_block)
catch(:prune) do
if block_given?
yield dependent, req
elsif req.optional? || req.recommended?
prune unless dependent.build.with?(req)
end
end
end
# Used to prune requirements when calling expand with a block.
def prune
throw(:prune, true)
end
end
end
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