c5520d0050
This is in part designed to handle situations described in https://github.com/Homebrew/legacy-homebrew/issues/42273 where we tell someone to install a special dependency, but because we (rightly, IMO) resolve special dependencies first users can end up being told to execute a command on a tool that isn't yet installed and isn't immediately obvious how to install it. In the situation raised there, with the `sile` formula people are being told to `luarocks install xyz` but we hadn't installed Lua for them first, so they just get a `command not found: luarocks` message. Perhaps it should be obvious enough how to install said tools by looking at the formula's dependencies, but it's not a huge burden on us to make life easier than that. Shuffled over from https://github.com/Homebrew/legacy-homebrew/pull/42576.
55 lines
1.5 KiB
Ruby
55 lines
1.5 KiB
Ruby
require "requirement"
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class LanguageModuleRequirement < Requirement
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fatal true
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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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super([language, module_name, import_name])
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end
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satisfy(:build_env => false) { quiet_system(*the_test) }
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def message
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s = <<-EOS.undent
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Unsatisfied dependency: #{@module_name}
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Homebrew does not provide special #{@language.to_s.capitalize} dependencies; install with:
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`#{command_line} #{@module_name}`
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EOS
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unless [:python, :perl, :ruby].include? @language
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s += <<-EOS.undent
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You may need to: `brew install #{@language}`
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EOS
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end
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s
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end
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def the_test
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case @language
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when :lua then %W[/usr/bin/env luarocks-5.2 show #{@import_name}]
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when :lua51 then %W[/usr/bin/env luarocks-5.1 show #{@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 :python3 then %W[/usr/bin/env python3 -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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end
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end
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def command_line
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case @language
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when :lua then "luarocks-5.2 install"
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when :lua51 then "luarocks-5.1 install"
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when :perl then "cpan -i"
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when :python then "pip install"
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when :python3 then "pip3 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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