Show cask description in `brew cask info` command

Library/Homebrew/cask/cmd/info.rb

@@ -36,6 +36,8 @@ module Cask
         repo = repo_info(cask)
         output << repo + "\n" if repo
         output << name_info(cask)
+        description = desc_info(cask)
+        output << description if description
         language = language_info(cask)
         output << language if language
         output << artifact_info(cask) + "\n"
@@ -82,6 +84,15 @@ module Cask
         EOS
       end
 
+      def self.desc_info(cask)
+        return if cask.desc.nil?
+
+        <<~EOS
+          #{ohai_title("Description")}
+          #{cask.desc}
+        EOS
+      end
+
       def self.language_info(cask)
         return if cask.languages.empty?
 

Library/Homebrew/test/cask/cmd/info_spec.rb

@@ -18,6 +18,8 @@ describe Cask::Cmd::Info, :cask do
       From: https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/local-transmission.rb
       ==> Name
       Transmission
+      ==> Description
+      BitTorrent client
       ==> Artifacts
       Transmission.app (App)
     EOS
@@ -56,6 +58,8 @@ describe Cask::Cmd::Info, :cask do
         From: https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/local-transmission.rb
         ==> Name
         Transmission
+        ==> Description
+        BitTorrent client
         ==> Artifacts
         Transmission.app (App)
       EOS

Library/Homebrew/test/cask/cmd/list_spec.rb

@@ -90,7 +90,7 @@ describe Cask::Cmd::List, :cask do
     let(:casks) { ["local-caffeine", "local-transmission"] }
     let(:expected_output) {
       <<~EOS
-        [{"token":"local-caffeine","name":[],"desc":null,"homepage":"https://brew.sh/","url":"file:///usr/local/Homebrew/Library/Homebrew/test/support/fixtures/cask/caffeine.zip","appcast":null,"version":"1.2.3","sha256":"67cdb8a02803ef37fdbf7e0be205863172e41a561ca446cd84f0d7ab35a99d94","artifacts":[["Caffeine.app"]],"caveats":null,"depends_on":{},"conflicts_with":null,"container":null,"auto_updates":null},{"token":"local-transmission","name":["Transmission"],"desc":null,"homepage":"https://transmissionbt.com/","url":"file:///usr/local/Homebrew/Library/Homebrew/test/support/fixtures/cask/transmission-2.61.dmg","appcast":null,"version":"2.61","sha256":"e44ffa103fbf83f55c8d0b1bea309a43b2880798dae8620b1ee8da5e1095ec68","artifacts":[["Transmission.app"]],"caveats":null,"depends_on":{},"conflicts_with":null,"container":null,"auto_updates":null}]
+        [{"token":"local-caffeine","name":[],"desc":null,"homepage":"https://brew.sh/","url":"file:///usr/local/Homebrew/Library/Homebrew/test/support/fixtures/cask/caffeine.zip","appcast":null,"version":"1.2.3","sha256":"67cdb8a02803ef37fdbf7e0be205863172e41a561ca446cd84f0d7ab35a99d94","artifacts":[["Caffeine.app"]],"caveats":null,"depends_on":{},"conflicts_with":null,"container":null,"auto_updates":null},{"token":"local-transmission","name":["Transmission"],"desc":"BitTorrent client","homepage":"https://transmissionbt.com/","url":"file:///usr/local/Homebrew/Library/Homebrew/test/support/fixtures/cask/transmission-2.61.dmg","appcast":null,"version":"2.61","sha256":"e44ffa103fbf83f55c8d0b1bea309a43b2880798dae8620b1ee8da5e1095ec68","artifacts":[["Transmission.app"]],"caveats":null,"depends_on":{},"conflicts_with":null,"container":null,"auto_updates":null}]
       EOS
     }
 

Library/Homebrew/test/support/fixtures/cask/Casks/local-transmission.rb

@@ -4,6 +4,7 @@ cask "local-transmission" do
 
   url "file://#{TEST_FIXTURE_DIR}/cask/transmission-2.61.dmg"
   name "Transmission"
+  desc "BitTorrent client"
   homepage "https://transmissionbt.com/"
 
   app "Transmission.app"