cask/auditor: only audit 10 languages by default on casks with many languages

Library/Homebrew/cask/auditor.rb

@@ -48,12 +48,22 @@ module Cask
       @except = except
     end
 
+    LANGUAGE_BLOCK_LIMIT = 10
+
     def audit
       warnings = Set.new
       errors = Set.new
 
       if !language && language_blocks
-        language_blocks.each_key do |l|
+        if language_blocks.length > LANGUAGE_BLOCK_LIMIT && !@audit_new_cask
+          sample_keys = language_blocks.keys.sample(LANGUAGE_BLOCK_LIMIT)
+          sample_languages = language_blocks.select { |k| sample_keys.include?(k) }
+          ohai "Auditing a sample of available languages: #{sample_keys.map { |lang| lang[0].to_s }.to_sentence}"
+        else
+          sample_languages = language_blocks
+        end
+
+        sample_languages.each_key do |l|
           audit = audit_languages(l)
           summary = audit.summary(include_passed: output_passed?, include_warnings: output_warnings?)
           if summary.present? && output_summary?(audit)

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

@@ -5,6 +5,7 @@ require "cask/auditor"
 
 describe Cask::Cmd::Audit, :cask do
   let(:cask) { Cask::Cask.new("cask") }
+  let(:cask_with_many_languages) { Cask::CaskLoader.load(cask_path("with-many-languages")) }
   let(:result) { { warnings: Set.new, errors: Set.new } }
 
   describe "selection of Casks to audit" do
@@ -160,4 +161,11 @@ describe Cask::Cmd::Audit, :cask do
 
     described_class.run("casktoken")
   end
+
+  it "audits a sample of language when cask contains more than 10 languages" do
+    allow(Cask::CaskLoader).to receive(:load).and_return(cask_with_many_languages)
+    expect {
+      described_class.run("with-many-languages")
+    }.to output(/==> auditing a sample of available languages/im).to_stdout
+  end
 end

Library/Homebrew/test/support/fixtures/cask/Casks/with-many-languages.rb

@@ -0,0 +1,55 @@
+cask "with-many-languages" do
+  version "1.2.3"
+
+  language "en", default: true do
+    sha256 :no_check
+    "en"
+  end
+  language "cs" do
+    sha256 :no_check
+    "cs"
+  end
+  language "es-AR" do
+    sha256 :no_check
+    "es-AR"
+  end
+  language "ff" do
+    sha256 :no_check
+    "ff"
+  end
+  language "fi" do
+    sha256 :no_check
+    "fi"
+  end
+  language "gn" do
+    sha256 :no_check
+    "gn"
+  end
+  language "gu" do
+    sha256 :no_check
+    "gu"
+  end
+  language "ko" do
+    sha256 :no_check
+    "ko"
+  end
+  language "ru" do
+    sha256 :no_check
+    "ru"
+  end
+  language "sv" do
+    sha256 :no_check
+    "sv"
+  end
+  language "th" do
+    sha256 :no_check
+    "th"
+  end
+
+  name "Caffeine"
+  desc "Keep your mac awake"
+  url "file://#{TEST_FIXTURE_DIR}/cask/caffeine#{version}.zip"
+  homepage "https://brew.sh/"
+
+  app "Caffeine.app"
+end