developer/bin/find-appcast: fix RuboCop style.

See https://github.com/Homebrew/brew/pull/7867.

developer/bin/find-appcast

@@ -1,11 +1,11 @@
 #!/usr/bin/env ruby
 
-require 'open3'
-require 'pathname'
-require 'yaml'
+require "open3"
+require "pathname"
+require "yaml"
 
-require 'net/http'
-require 'uri'
+require "net/http"
+require "uri"
 
 def verify_appcast(appcast_type, *urls)
   print "Looking for #{appcast_type} appcast… "
@@ -13,46 +13,46 @@ def verify_appcast(appcast_type, *urls)
   urls.each do |url|
     next unless url_exist?(url)
 
-    puts 'Found!'
+    puts "Found!"
     puts "  #{url}"
     return true
   end
 
-  puts 'Not found.'
+  puts "Not found."
   false
 end
 
 def url_exist?(url)
   return false unless url
 
-  system('curl', '--silent', '--location', '--fail', url, out: File::NULL)
+  system("curl", "--silent", "--location", "--fail", url, out: File::NULL)
 end
 
 def find_sparkle(app)
-  plist = app.join('Contents/Info.plist')
-  url = Open3.capture3('defaults', 'read', plist.to_path, 'SUFeedURL').first.strip
+  plist = app.join("Contents/Info.plist")
+  url = Open3.capture3("defaults", "read", plist.to_path, "SUFeedURL").first.strip
 
-  verify_appcast('Sparkle', url)
+  verify_appcast("Sparkle", url)
 end
 
 def find_electron_builder(app)
-  appcast_file = app.join('Contents/Resources/app-update.yml')
+  appcast_file = app.join("Contents/Resources/app-update.yml")
 
   unless appcast_file.exist?
-    verify_appcast('electron-builder', false)
+    verify_appcast("electron-builder", false)
     return false
   end
 
   data = YAML.load_file(appcast_file)
-  bucket = data['bucket']
-  channel = data['channel']
-  endpoint = data['endpoint']
-  name = data['name']
-  owner = data['owner']
-  path = data['path']
-  region = data['region']
-  repo = data['repo']
-  url = data['url']
+  bucket = data["bucket"]
+  channel = data["channel"]
+  endpoint = data["endpoint"]
+  name = data["name"]
+  owner = data["owner"]
+  path = data["path"]
+  region = data["region"]
+  repo = data["repo"]
+  url = data["url"]
 
   possible_appcasts = [
     "#{url}/latest-mac.yml",
@@ -66,9 +66,12 @@ def find_electron_builder(app)
     "https://#{name}.#{region}.digitaloceanspaces.com/latest-mac.yml",
     "https://#{name}.#{region}.digitaloceanspaces.com/#{path}/latest-mac.yml",
     "#{endpoint}/#{bucket}/#{path}/latest-mac.yml",
-  ].map { |appcast| appcast.gsub(%r{(?<!:)/{2,}}, '/') } # Collapse groups of two or more forward slahses into one, except when preceded by a colon
+  ].map do |appcast|
+    # Collapse groups of two or more forward slashes into one, except when preceded by a colon
+    appcast.gsub(%r{(?<!:)/{2,}}, "/")
+  end
 
-  unless verify_appcast('electron-builder', *possible_appcasts)
+  unless verify_appcast("electron-builder", *possible_appcasts)
     warn <<~MESSAGE
 
       An "app-update.yml" file was found, but we could not parse it.
@@ -81,7 +84,7 @@ def find_electron_builder(app)
   end
 end
 
-App = Pathname(ARGV[0])
+App = Pathname(ARGV[0]).freeze
 
 find_sparkle(App)
 find_electron_builder(App)