Make Cask#to_h work without the API

Set metadata when we load casks from the source API.

Set `@tap_git_head` manually.

Also, allow `auto_update` to receive false.
This is only done for consistency.

Stop double printing the `kext` caveat.

Handle Array elements correctly when substituting
path elements in artifacts. This affected how the
Uninstall Signal keys were evaluated (they are
represented as arrays of arrays).

Library/Homebrew/cask/artifact/abstract_uninstall.rb

@@ -45,6 +45,8 @@ module Cask
         directives[:signal] = Array(directives[:signal]).flatten.each_slice(2).to_a
         @directives = directives
 
+        # This is already included when loading from the API.
+        return if cask.loaded_from_api?
         return unless directives.key?(:kext)
 
         cask.caveats do

Library/Homebrew/cask/cask.rb

@@ -17,6 +17,7 @@ module Cask
 
     extend Forwardable
     extend Searchable
+    extend Predicable
     include Metadata
 
     # Needs a leading slash to avoid `File.expand.path` complaining about non-absolute home.
@@ -27,10 +28,11 @@ module Cask
     # TODO: can be removed when API JSON is regenerated with HOMEBREW_PREFIX_PLACEHOLDER.
     HOMEBREW_OLD_PREFIX_PLACEHOLDER = "$(brew --prefix)"
 
-    attr_reader :token, :sourcefile_path, :source, :config, :default_config, :loaded_from_api, :loader
-
+    attr_reader :token, :sourcefile_path, :source, :config, :default_config, :loader
     attr_accessor :download, :allow_reassignment
 
+    attr_predicate :loaded_from_api?
+
     class << self
       def generating_hash!
         return if generating_hash?
@@ -83,14 +85,14 @@ module Cask
       @tap
     end
 
-    def initialize(token, sourcefile_path: nil, source: nil, tap: nil,
+    def initialize(token, sourcefile_path: nil, source: nil, tap: nil, loaded_from_api: false,
                    config: nil, allow_reassignment: false, loader: nil, &block)
       @token = token
       @sourcefile_path = sourcefile_path
       @source = source
       @tap = tap
       @allow_reassignment = allow_reassignment
-      @loaded_from_api = false
+      @loaded_from_api = loaded_from_api
       @loader = loader
       @block = block
 
@@ -278,7 +280,8 @@ module Cask
     end
 
     def populate_from_api!(json_cask)
-      @loaded_from_api = true
+      raise ArgumentError, "Expected cask to be loaded from the API" unless loaded_from_api?
+
       @languages = json_cask[:languages]
       @tap_git_head = json_cask[:tap_git_head]
       @ruby_source_checksum = json_cask[:ruby_source_checksum].freeze
@@ -334,7 +337,7 @@ module Cask
     end
 
     def to_hash_with_variations
-      if loaded_from_api && !Homebrew::EnvConfig.no_install_from_api?
+      if loaded_from_api? && !Homebrew::EnvConfig.no_install_from_api?
         return api_to_local_hash(Homebrew::API::Cask.all_casks[token])
       end
 

Library/Homebrew/cask/cask_loader.rb

@@ -219,11 +219,17 @@ module Cask
 
       def load(config:)
         json_cask = @from_json || Homebrew::API::Cask.all_casks[token]
-        cask_source = JSON.pretty_generate(json_cask)
+
+        cask_options = {
+          loaded_from_api: true,
+          source:          JSON.pretty_generate(json_cask),
+          config:          config,
+          loader:          self,
+        }
 
         json_cask = Homebrew::API.merge_variations(json_cask).deep_symbolize_keys.freeze
 
-        tap = Tap.fetch(json_cask[:tap]) if json_cask[:tap].to_s.include?("/")
+        cask_options[:tap] = Tap.fetch(json_cask[:tap]) if json_cask[:tap].to_s.include?("/")
 
         user_agent = json_cask.dig(:url_specs, :user_agent)
         json_cask[:url_specs][:user_agent] = user_agent[1..].to_sym if user_agent && user_agent[0] == ":"
@@ -231,7 +237,7 @@ module Cask
           json_cask[:url_specs][:using] = using.to_sym
         end
 
-        api_cask = Cask.new(token, tap: tap, source: cask_source, config: config, loader: self) do
+        api_cask = Cask.new(token, **cask_options) do
           version json_cask[:version]
 
           if json_cask[:sha256] == "no_check"
@@ -248,7 +254,7 @@ module Cask
           desc json_cask[:desc]
           homepage json_cask[:homepage]
 
-          auto_updates json_cask[:auto_updates] if json_cask[:auto_updates].present?
+          auto_updates json_cask[:auto_updates] unless json_cask[:auto_updates].nil?
           conflicts_with(**json_cask[:conflicts_with]) if json_cask[:conflicts_with].present?
 
           if json_cask[:depends_on].present?
@@ -289,7 +295,7 @@ module Cask
 
           json_cask[:artifacts].each do |artifact|
             # convert generic string replacements into actual ones
-            artifact = cask.loader.from_h_hash_gsubs(artifact, appdir)
+            artifact = cask.loader.from_h_gsubs(artifact, appdir)
             key = artifact.keys.first
             if artifact[key].nil?
               # for artifacts with blocks that can't be loaded from the API
@@ -328,18 +334,17 @@ module Cask
         hash.to_h.transform_values do |value|
           from_h_gsubs(value, appdir)
         end
-      rescue TypeError
-        from_h_array_gsubs(hash, appdir)
       end
 
       def from_h_gsubs(value, appdir)
         return value if value.blank?
 
-        if value.respond_to? :to_h
+        case value
+        when Hash
           from_h_hash_gsubs(value, appdir)
-        elsif value.respond_to? :to_a
+        when Array
           from_h_array_gsubs(value, appdir)
-        elsif value.is_a? String
+        when String
           from_h_string_gsubs(value, appdir)
         else
           value

Library/Homebrew/cask/installer.rb

@@ -64,7 +64,7 @@ module Cask
     def fetch(quiet: nil, timeout: nil)
       odebug "Cask::Installer#fetch"
 
-      load_cask_from_source_api! if @cask.loaded_from_api && @cask.caskfile_only?
+      load_cask_from_source_api! if @cask.loaded_from_api? && @cask.caskfile_only?
 
       verify_has_sha if require_sha? && !force?
 
@@ -382,7 +382,7 @@ module Cask
 
       return if @cask.source.blank?
 
-      extension = @cask.loaded_from_api ? "json" : "rb"
+      extension = @cask.loaded_from_api? ? "json" : "rb"
       (metadata_subdir/"#{@cask.token}.#{extension}").write @cask.source
       old_savedir&.rmtree
     end
@@ -559,7 +559,7 @@ module Cask
         end
       end
 
-      load_cask_from_source_api! if @cask.loaded_from_api && @cask.caskfile_only?
+      load_cask_from_source_api! if @cask.loaded_from_api? && @cask.caskfile_only?
       # otherwise we default to the current cask
     end
 

Library/Homebrew/test/cask/cask_loader/from_api_loader_spec.rb

@@ -66,7 +66,7 @@ describe Cask::CaskLoader::FromAPILoader, :cask do
       it "loads from JSON API" do
         expect(cask_from_api).to be_a(Cask::Cask)
         expect(cask_from_api.token).to eq(cask_token)
-        expect(cask_from_api.loaded_from_api).to be(true)
+        expect(cask_from_api.loaded_from_api?).to be(true)
         expect(cask_from_api.caskfile_only?).to be(caskfile_only)
       end
     end

Library/Homebrew/test/cask/installer_spec.rb

@@ -244,7 +244,7 @@ describe Cask::Installer, :cask do
         expect(Homebrew::API::Cask).to receive(:fetch_source).once.and_return(content)
 
         caffeine = Cask::CaskLoader.load(path)
-        expect(caffeine).to receive(:loaded_from_api).once.and_return(true)
+        expect(caffeine).to receive(:loaded_from_api?).once.and_return(true)
         expect(caffeine).to receive(:caskfile_only?).once.and_return(true)
 
         described_class.new(caffeine).install
@@ -299,7 +299,7 @@ describe Cask::Installer, :cask do
         expect(Homebrew::API::Cask).to receive(:fetch_source).twice.and_return(content)
 
         caffeine = Cask::CaskLoader.load(path)
-        expect(caffeine).to receive(:loaded_from_api).twice.and_return(true)
+        expect(caffeine).to receive(:loaded_from_api?).twice.and_return(true)
         expect(caffeine).to receive(:caskfile_only?).twice.and_return(true)
         expect(caffeine).to receive(:installed_caskfile).once.and_return(invalid_path)