Rename requirements named *Dependency.

Dependency is another similar, related class and it's super confusing
to have some Requirements that are named *Dependency.

Closes Homebrew/homebrew#38891.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/Library/Homebrew/requirements/language_module_requirement.rb b/Library/Homebrew/requirements/language_module_requirement.rb
new file mode 100644
index 000000000..47cbe8bc1
--- /dev/null
+++ b/Library/Homebrew/requirements/language_module_requirement.rb
@@ -0,0 +1,51 @@
+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 :chicken then %W{/usr/bin/env csi -e (use\ #{@import_name})}
+      when :jruby then %W{/usr/bin/env jruby -rubygems -e require\ '#{@import_name}'}
+      when :lua then %W{/usr/bin/env luarocks show #{@import_name}}
+      when :node then %W{/usr/bin/env node -e require('#{@import_name}');}
+      when :ocaml then %W{/usr/bin/env opam list --installed #{@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}'}
+      when :rbx then %W{/usr/bin/env rbx -rubygems -e require\ '#{@import_name}'}
+    end
+  end
+
+  def command_line
+    case @language
+      when :chicken then "chicken-install"
+      when :jruby   then "jruby -S gem install"
+      when :lua     then "luarocks install"
+      when :node    then "npm install"
+      when :ocaml   then "opam install"
+      when :perl    then "cpan -i"
+      when :python  then "pip install"
+      when :python3 then "pip3 install"
+      when :rbx     then "rbx gem install"
+      when :ruby    then "gem install"
+    end
+  end
+end