Fix all rubocop warnings

lib/tasks/branding.rake

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 namespace :branding do
   desc 'Generate necessary graphic assets for branding from source SVG files'
   task generate: :environment do

lib/tasks/emojis.rake

@@ -69,7 +69,7 @@ namespace :emojis do
       end
     end
 
-    existence_maps = grouped_codes.map { |c| c.index_with { |cc| File.exist?(Rails.root.join('public', 'emoji', codepoints_to_filename(cc) + '.svg')) } }
+    existence_maps = grouped_codes.map { |c| c.index_with { |cc| File.exist?(Rails.root.join('public', 'emoji', "#{codepoints_to_filename(cc)}.svg")) } }
     map = {}
 
     existence_maps.each do |group|

lib/tasks/mastodon.rake

@@ -399,11 +399,13 @@ namespace :mastodon do
             prompt.say 'Running `RAILS_ENV=production rails assets:precompile` ...'
             prompt.say "\n\n"
 
+            # rubocop:disable Metrics/BlockNesting
             if !system(env.transform_values(&:to_s).merge({ 'RAILS_ENV' => 'production' }), 'rails assets:precompile')
               prompt.error 'That failed! Maybe you need swap space?'
             else
               prompt.say 'Done!'
             end
+            # rubocop:enable Metrics/BlockNesting
           end
         end
 

lib/tasks/repo.rake

@@ -50,7 +50,7 @@ namespace :repo do
         file.each_line do |line|
           if line.start_with?('-')
             new_line = line.gsub(/#([[:digit:]]+)*/) do |pull_request_reference|
-              pull_request_number = pull_request_reference[1..-1]
+              pull_request_number = pull_request_reference[1..]
               response = nil
 
               loop do

lib/tasks/statistics.rake

@@ -7,7 +7,7 @@ namespace :mastodon do
   task :stats do
     require 'rails/code_statistics'
     [
-      %w(App\ Libraries app/lib),
+      ['App Libraries', 'app/lib'],
       %w(Presenters app/presenters),
       %w(Services app/services),
       %w(Validators app/validators),