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