info: include versions and other details in Requirements display

Library/Homebrew/cmd/info.rb

@@ -45,7 +45,7 @@ module Homebrew
       end
     else
       ARGV.named.each_with_index do |f, i|
-        puts unless i == 0
+        puts unless i.zero?
         begin
           if f.include?("/") || File.exist?(f)
             info_formula Formulary.factory(f)
@@ -150,7 +150,8 @@ module Homebrew
       ohai "Requirements"
       %w[build required recommended optional].map do |type|
         reqs = f.requirements.select(&:"#{type}?")
-        puts "#{type.capitalize}: #{decorate_requirements(reqs)}" unless reqs.to_a.empty?
+        next if reqs.to_a.empty?
+        puts "#{type.capitalize}: #{decorate_requirements(reqs)}"
       end
     end
 
@@ -172,8 +173,9 @@ module Homebrew
 
   def decorate_requirements(requirements)
     req_status = requirements.collect do |req|
-      req.satisfied? ? pretty_installed(req.name) : pretty_uninstalled(req.name)
+      req_s = req.display_s
+      req.satisfied? ? pretty_installed(req_s) : pretty_uninstalled(req_s)
     end
-    req_status * ", "
+    req_status.join(", ")
   end
 end

Library/Homebrew/requirement.rb

@@ -122,6 +122,10 @@ class Requirement
     end
   end
 
+  def display_s
+    name
+  end
+
   private
 
   def infer_name

Library/Homebrew/requirements/java_requirement.rb

@@ -42,4 +42,19 @@ class JavaRequirement < Requirement
   def inspect
     "#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
   end
+
+  def display_s
+    if @version
+      if @version[-1] == "+"
+        op = ">="
+        version = @version[0, @version.length-1]
+      else
+        op = "="
+        version = @version
+      end
+      "#{name} #{op} #{version}"
+    else
+      name
+    end
+  end
 end

Library/Homebrew/requirements/language_module_requirement.rb

@@ -51,4 +51,8 @@ class LanguageModuleRequirement < Requirement
     when :ruby    then "gem install"
     end
   end
+
+  def display_s
+    "#{@module_name} (#{@language} module)"
+  end
 end

Library/Homebrew/requirements/maximum_macos_requirement.rb

@@ -16,4 +16,8 @@ class MaximumMacOSRequirement < Requirement
       versions newer than #{@version.pretty_name} due to an upstream incompatibility.
     EOS
   end
+
+  def display_s
+    "macOS <= #{@version}"
+  end
 end

Library/Homebrew/requirements/minimum_macos_requirement.rb

@@ -13,4 +13,8 @@ class MinimumMacOSRequirement < Requirement
   def message
     "OS X #{@version.pretty_name} or newer is required."
   end
+
+  def display_s
+    "macOS >= #{@version}"
+  end
 end

Library/Homebrew/requirements/perl_requirement.rb

@@ -25,4 +25,12 @@ class PerlRequirement < Requirement
   def inspect
     "#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
   end
+
+  def display_s
+    if @version
+      "#{name} >= #{@version}"
+    else
+      name
+    end
+  end
 end

Library/Homebrew/requirements/ruby_requirement.rb

@@ -25,4 +25,12 @@ class RubyRequirement < Requirement
   def inspect
     "#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
   end
+
+  def display_s
+    if @version
+      "#{name} >= #{@version}"
+    else
+      name
+    end
+  end
 end