Implement Downloadable for more types.

Library/Homebrew/cmd/fetch.rb

@@ -296,6 +296,10 @@ def run
 
                 sleep 0.05
               rescue Interrupt
+                remaining_downloads.each do |_, future|
+                  # FIXME: Implement cancellation of running downloads.
+                end
+
                 print "\n" * previous_pending_line_count
                 $stdout.flush
                 raise

Library/Homebrew/cmd/install.rb

@@ -207,7 +207,6 @@ def run
         end
 
         if casks.any?
-
           if args.dry_run?
             if (casks_to_install = casks.reject(&:installed?).presence)
               ohai "Would install #{::Utils.pluralize("cask", casks_to_install.count, include_count: true)}:"

Library/Homebrew/download_strategy.rb

@@ -710,14 +710,6 @@ def stage
   end
 end
 
-# Strategy for extracting local binary packages.
-class LocalBottleDownloadStrategy < AbstractFileDownloadStrategy
-  def initialize(path) # rubocop:disable Lint/MissingSuper
-    @cached_location = path
-    extend Pourable
-  end
-end
-
 # Strategy for downloading a Subversion repository.
 #
 # @api public

Library/Homebrew/downloadable.rb

@@ -126,7 +126,7 @@ def verify_download_integrity(filename)
 
   sig { overridable.returns(String) }
   def download_name
-    File.basename(determine_url.to_s)
+    @download_name ||= File.basename(determine_url.to_s)
   end
 
   private

Library/Homebrew/formula.rb

@@ -2773,10 +2773,12 @@ def on_system_blocks_exist?
     ).returns(Pathname)
   }
   def fetch(verify_download_integrity: true, timeout: nil, quiet: false)
+    odeprecated "Formula#fetch", "Resource#fetch on Formula#resource"
     active_spec.fetch(verify_download_integrity:, timeout:, quiet:)
   end
 
   def verify_download_integrity(filename)
+    odeprecated "Formula#verify_download_integrity", "Resource#verify_download_integrity on Formula#resource"
     active_spec.verify_download_integrity(filename)
   end
 

Library/Homebrew/formula_installer.rb

@@ -1261,11 +1261,11 @@ def fetch
 
   def downloader
     if (bottle_path = formula.local_bottle_path)
-      LocalBottleDownloadStrategy.new(bottle_path)
+      Resource::Local.new(bottle_path)
     elsif pour_bottle?
       formula.bottle
     else
-      formula
+      formula.resource
     end
   end
 

Library/Homebrew/resource.rb

@@ -269,6 +269,33 @@ def determine_url_mirrors
     [*extra_urls, *super].uniq
   end
 
+  # A local resource that doesn't need to be downloaded.
+  class Local < Resource
+    def initialize(path)
+      super(File.basename(path))
+      @path = path
+    end
+
+    sig { override.returns(Pathname) }
+    def cached_download
+      @path
+    end
+
+    sig { override.void }
+    def clear_cache; end
+
+    sig {
+      override.params(
+        verify_download_integrity: T::Boolean,
+        timeout:                   T.nilable(T.any(Integer, Float)),
+        quiet:                     T::Boolean,
+      ).returns(Pathname)
+    }
+    def fetch(verify_download_integrity: true, timeout: nil, quiet: false)
+      cached_download
+    end
+  end
+
   # A resource for a formula.
   class Formula < Resource
     sig { override.returns(String) }