Merge pull request #2470 from johnhawkinson/conflicts-info

Display formula conflict reasons

Library/Homebrew/cmd/info.rb

@@ -123,8 +123,16 @@ module Homebrew
     puts f.desc if f.desc
     puts Formatter.url(f.homepage) if f.homepage
 
-    conflicts = f.conflicts.map(&:name).sort!
-    puts "Conflicts with: #{conflicts*", "}" unless conflicts.empty?
+    conflicts = f.conflicts.map do |c|
+      reason = " (because #{c.reason})" if c.reason
+      "#{c.name}#{reason}"
+    end.sort!
+    unless conflicts.empty?
+      puts <<-EOS.undent
+        Conflicts with:
+          #{conflicts.join("  \n")}
+      EOS
+    end
 
     kegs = f.installed_kegs.sort_by(&:version)
     if kegs.empty?

Library/Homebrew/formula.rb

@@ -2366,7 +2366,7 @@ class Formula
     end
 
     # If this formula conflicts with another one.
-    # <pre>conflicts_with "imagemagick", :because => "because this is just a stupid example"</pre>
+    # <pre>conflicts_with "imagemagick", :because => "because both install 'convert' binaries"</pre>
     def conflicts_with(*names)
       opts = names.last.is_a?(Hash) ? names.pop : {}
       names.each { |name| conflicts << FormulaConflict.new(name, opts[:because]) }