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require 'dependable'
require 'dependency'
require 'build_environment'
require 'extend/ENV'
# 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
extend BuildEnvironmentDSL
attr_reader :tags, :name
def initialize(tags=[])
@tags = tags
@tags << :build if self.class.build
@name ||= infer_name
end
# The message to show when the requirement is not met.
def message; "" end
# Overriding #satisfied? is deprecated.
# Pass a block or boolean to the satisfy DSL method instead.
def satisfied?
result = self.class.satisfy.yielder do |proc|
instance_eval(&proc)
end
infer_env_modification(result)
!!result
end
# Overriding #fatal? is deprecated.
# Pass a boolean to the fatal DSL method instead.
def fatal?
self.class.fatal || false
end
def default_formula?
self.class.default_formula || false
end
# Overriding #modify_build_environment is deprecated.
# Pass a block to the the env DSL method instead.
# Note: #satisfied? should be called before invoking this method
# as the env modifications may depend on its side effects.
def modify_build_environment
env.modify_build_environment(self)
end
def env
@env ||= self.class.env
end
def eql?(other)
instance_of?(other.class) && name == other.name && tags == other.tags
end
def hash
[name, *tags].hash
end
def inspect
"#<#{self.class}: #{name.inspect} #{tags.inspect}>"
end
def to_dependency
f = self.class.default_formula
raise "No default formula defined for #{inspect}" if f.nil?
dep = Dependency.new(f, tags)
dep.env_proc = method(:modify_build_environment)
dep
end
private
def infer_name
klass = self.class.to_s
klass.sub!(/(Dependency|Requirement)$/, '')
klass.sub!(/^(\w+::)*/, '')
klass.downcase
end
def infer_env_modification(o)
case o
when Pathname
self.class.env do
unless ENV["PATH"].split(File::PATH_SEPARATOR).include?(o.parent.to_s)
ENV.append_path("PATH", o.parent)
end
end
end
end
def which(cmd)
super(cmd, ORIGINAL_PATHS.join(File::PATH_SEPARATOR))
end
class << self
attr_rw :fatal, :build, :default_formula
def satisfy(options={}, &block)
@satisfied ||= Requirement::Satisfier.new(options, &block)
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]
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 = ComparableSet.new
formulae = dependent.recursive_dependencies.map(&:to_formula)
formulae.unshift(dependent)
formulae.each do |f|
f.requirements.each do |req|
if prune?(f, req, &block)
next
else
reqs << req
end
end
end
# We special case handling of X11Dependency and its subclasses to
# ensure the correct dependencies are present in the final list.
# If an X11Dependency is present after filtering, we eliminate
# all X11Dependency::Proxy objects from the list. If there aren't
# any X11Dependency objects, then we eliminate all but one of the
# proxy objects.
proxy = unless reqs.any? { |r| r.instance_of?(X11Dependency) }
reqs.find { |r| r.kind_of?(X11Dependency::Proxy) }
end
reqs.reject! do |r|
r.kind_of?(X11Dependency::Proxy)
end
reqs << proxy unless proxy.nil?
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.name)
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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