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## This file defines dependencies and requirements.
##
## A dependency is a formula that another formula needs to install.
## A requirement is something other than a formula that another formula
## needs to be present. This includes external language modules,
## command-line tools in the path, or any arbitrary predicate.
##
## The `depends_on` method in the formula DSL is used to declare
## dependencies and requirements.
# This class is used by `depends_on` in the formula DSL to turn dependency
# specifications into the proper kinds of dependencies and requirements.
class DependencyCollector
# Define the languages that we can handle as external dependencies.
LANGUAGE_MODULES = [
:chicken, :jruby, :lua, :node, :perl, :python, :rbx, :ruby
].freeze
attr_reader :deps, :external_deps
def initialize
@deps = Dependencies.new
@external_deps = []
end
def add spec
case spec
when String then @deps << Dependency.new(spec)
when Formula then @deps << Dependency.new(spec.name)
when Dependency then @deps << spec
when Requirement then @external_deps << spec
when Hash
key, value = spec.shift
case value
when Array
@deps << Dependency.new(key, value)
when *LANGUAGE_MODULES
@external_deps << LanguageModuleDependency.new(key, value)
else
# :optional, :recommended, :build, :universal and "32bit" are predefined
@deps << Dependency.new(key, [value])
end
else
raise "Unsupported type #{spec.class} for #{spec}"
end
end
end
# A list of formula dependencies.
class Dependencies < Array
def include? dependency_name
self.any?{|d| d.name == dependency_name}
end
end
# A dependency on another Homebrew formula.
class Dependency
attr_reader :name, :tags
def initialize name, tags=nil
@name = name
tags = [] if tags == nil
@tags = tags.each {|s| s.to_s}
end
def to_s
@name
end
def ==(other_dep)
@name = other_dep.to_s
end
def options
@tags.select{|p|p.start_with? '--'}
end
end
# 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
def satisfied?; false; end
def fatal?; false; end
def message; ""; end
end
# A dependency on a language-specific module.
class LanguageModuleDependency < Requirement
def initialize module_name, type
@module_name = module_name
@type = type
end
def fatal?; true; end
def satisfied?
quiet_system *the_test
end
def message; <<-EOS.undent
Unsatisfied dependency: #{@module_name}
Homebrew does not provide #{@type.to_s.capitalize} dependencies; install with:
#{command_line} #{@module_name}
EOS
end
def the_test
case @type
when :chicken then %W{/usr/bin/env csi -e (use #{@module_name})}
when :jruby then %W{/usr/bin/env jruby -rubygems -e require\ '#{@module_name}'}
when :lua then %W{/usr/bin/env luarocks show #{@module_name}}
when :node then %W{/usr/bin/env node -e require('#{@module_name}');}
when :perl then %W{/usr/bin/env perl -e use\ #{@module_name}}
when :python then %W{/usr/bin/env python -c import\ #{@module_name}}
when :ruby then %W{/usr/bin/env ruby -rubygems -e require\ '#{@module_name}'}
when :rbx then %W{/usr/bin/env rbx -rubygems -e require\ '#{@module_name}'}
end
end
def command_line
case @type
when :chicken then "chicken-install"
when :jruby then "jruby -S gem install"
when :lua then "luarocks install"
when :node then "npm install"
when :perl then "cpan -i"
when :python then "easy_install"
when :rbx then "rbx gem install"
when :ruby then "gem install"
end
end
end
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