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require "requirement"
class LanguageModuleRequirement < Requirement
fatal true
def initialize(language, module_name, import_name = nil)
@language = language
@module_name = module_name
@import_name = import_name || module_name
super([language, module_name, import_name])
end
satisfy(:build_env => false) { quiet_system(*the_test) }
def message; <<-EOS.undent
Unsatisfied dependency: #{@module_name}
Homebrew does not provide #{@language.to_s.capitalize} dependencies; install with:
#{command_line} #{@module_name}
EOS
end
def the_test
case @language
when :lua then %W[/usr/bin/env luarocks-5.2 show #{@import_name}]
when :lua51 then %W[/usr/bin/env luarocks-5.1 show #{@import_name}]
when :perl then %W[/usr/bin/env perl -e use\ #{@import_name}]
when :python then %W[/usr/bin/env python -c import\ #{@import_name}]
when :python3 then %W[/usr/bin/env python3 -c import\ #{@import_name}]
when :ruby then %W[/usr/bin/env ruby -rubygems -e require\ '#{@import_name}']
end
end
def command_line
case @language
when :lua then "luarocks-5.2 install"
when :lua51 then "luarocks-5.1 install"
when :perl then "cpan -i"
when :python then "pip install"
when :python3 then "pip3 install"
when :ruby then "gem install"
end
end
end
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