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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
s = <<~EOS
Unsatisfied dependency: #{@module_name}
Homebrew does not provide special #{@language.to_s.capitalize} dependencies; install with:
`#{command_line} #{@module_name}`
EOS
unless [:python, :perl, :ruby].include? @language
s += <<~EOS
You may need to: `brew install #{@language}`
EOS
end
s
end
def the_test
case @language
when :lua
["/usr/bin/env", "luarocks-5.2", "show", @import_name.to_s]
when :lua51
["/usr/bin/env", "luarocks-5.1", "show", @import_name.to_s]
when :perl
["/usr/bin/env", "perl", "-e", "use #{@import_name}"]
when :python
["/usr/bin/env", "python", "-c", "import #{@import_name}"]
when :python3
["/usr/bin/env", "python3", "-c", "import #{@import_name}"]
when :ruby
["/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
def display_s
"#{@module_name} (#{@language} module)"
end
end
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