diff --git a/.rubocop.yml b/.rubocop.yml
index a122808d..42968658 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -42,6 +42,10 @@ Style/ClassAndModuleChildren:
 Style/GuardClause:
   Enabled: false
 
+Style/IndentHeredoc:
+  # TODO(glebm): Remove this when we update the minimum Ruby version to 2.3+.
+  Enabled: false
+
 Style/MultilineBlockChain:
   Enabled: false
 
diff --git a/Gemfile b/Gemfile
index 800e5dc0..678503a2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in i18n-tasks.gemspec
@@ -6,7 +7,7 @@ gemspec
 
 unless ENV['TRAVIS']
   group :development do
-    gem 'byebug', platforms: [:mri, :mswin, :x64_mingw_21, :x64_mingw_22], require: false
+    gem 'byebug', platforms: %i(mri mswin x64_mingw_21 x64_mingw_22), require: false
     gem 'rubinius-debugger', platform: :rbx, require: false
   end
 end
diff --git a/Rakefile b/Rakefile
index fdd9c291..2ae6f0e8 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 RSpec::Core::RakeTask.new(:rspec)
diff --git a/i18n-tasks.gemspec b/i18n-tasks.gemspec
index 463768af..01ec3f88 100644
--- a/i18n-tasks.gemspec
+++ b/i18n-tasks.gemspec
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'i18n/tasks/version'
diff --git a/lib/i18n/tasks.rb b/lib/i18n/tasks.rb
index 9452ecd1..4153a3c7 100644
--- a/lib/i18n/tasks.rb
+++ b/lib/i18n/tasks.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 # define all the modules to be able to use ::
 module I18n
   module Tasks
diff --git a/lib/i18n/tasks/base_task.rb b/lib/i18n/tasks/base_task.rb
index d798b541..6d9317c8 100644
--- a/lib/i18n/tasks/base_task.rb
+++ b/lib/i18n/tasks/base_task.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/command_error'
 require 'i18n/tasks/split_key'
 require 'i18n/tasks/key_pattern_matching'
diff --git a/lib/i18n/tasks/cli.rb b/lib/i18n/tasks/cli.rb
index be78de9a..487cad46 100644
--- a/lib/i18n/tasks/cli.rb
+++ b/lib/i18n/tasks/cli.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks'
 require 'i18n/tasks/commands'
 require 'optparse'
diff --git a/lib/i18n/tasks/command/collection.rb b/lib/i18n/tasks/command/collection.rb
index 22607dfc..111b873f 100644
--- a/lib/i18n/tasks/command/collection.rb
+++ b/lib/i18n/tasks/command/collection.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/command/dsl'
 require 'i18n/tasks/command/options/common'
 require 'i18n/tasks/command/options/locales'
diff --git a/lib/i18n/tasks/command/commander.rb b/lib/i18n/tasks/command/commander.rb
index e0fa4f98..286a38bc 100644
--- a/lib/i18n/tasks/command/commander.rb
+++ b/lib/i18n/tasks/command/commander.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/cli'
 require 'i18n/tasks/reports/terminal'
 require 'i18n/tasks/reports/spreadsheet'
diff --git a/lib/i18n/tasks/command/commands/data.rb b/lib/i18n/tasks/command/commands/data.rb
index fd8e1499..c8694161 100644
--- a/lib/i18n/tasks/command/commands/data.rb
+++ b/lib/i18n/tasks/command/commands/data.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module Commands
@@ -13,7 +14,7 @@ module Data
         cmd :normalize,
             pos:  '[locale ...]',
             desc: t('i18n_tasks.cmd.desc.normalize'),
-            args: [:locales, :pattern_router]
+            args: %i(locales pattern_router)
 
         def normalize(opt = {})
           i18n.normalize_store! opt[:locales], opt[:pattern_router]
@@ -48,7 +49,7 @@ def rm(opt = {})
         cmd :data,
             pos:  '[locale ...]',
             desc: t('i18n_tasks.cmd.desc.data'),
-            args: [:locales, :out_format]
+            args: %i(locales out_format)
 
         def data(opt = {})
           print_forest i18n.data_forest(opt[:locales]), opt
@@ -57,7 +58,7 @@ def data(opt = {})
         cmd :data_merge,
             pos:  '[tree ...]',
             desc: t('i18n_tasks.cmd.desc.data_merge'),
-            args: [:data_format, :nostdin]
+            args: %i(data_format nostdin)
 
         def data_merge(opt = {})
           forest = merge_forests_stdin_and_pos!(opt)
@@ -68,7 +69,7 @@ def data_merge(opt = {})
         cmd :data_write,
             pos:  '[tree]',
             desc: t('i18n_tasks.cmd.desc.data_write'),
-            args: [:data_format, :nostdin]
+            args: %i(data_format nostdin)
 
         def data_write(opt = {})
           forest = forest_pos_or_stdin!(opt)
@@ -79,7 +80,7 @@ def data_write(opt = {})
         cmd :data_remove,
             pos:  '[tree]',
             desc: t('i18n_tasks.cmd.desc.data_remove'),
-            args: [:data_format, :nostdin]
+            args: %i(data_format nostdin)
 
         def data_remove(opt = {})
           removed = i18n.data.remove_by_key!(forest_pos_or_stdin!(opt))
diff --git a/lib/i18n/tasks/command/commands/eq_base.rb b/lib/i18n/tasks/command/commands/eq_base.rb
index 3a622874..63a7f8d9 100644
--- a/lib/i18n/tasks/command/commands/eq_base.rb
+++ b/lib/i18n/tasks/command/commands/eq_base.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module Commands
@@ -8,7 +9,7 @@ module EqBase
         cmd :eq_base,
             pos:  '[locale ...]',
             desc: t('i18n_tasks.cmd.desc.eq_base'),
-            args: [:locales, :out_format]
+            args: %i(locales out_format)
 
         def eq_base(opt = {})
           print_forest i18n.eq_base_keys(opt), opt, :eq_base_keys
diff --git a/lib/i18n/tasks/command/commands/health.rb b/lib/i18n/tasks/command/commands/health.rb
index 78c90f5a..21851f51 100644
--- a/lib/i18n/tasks/command/commands/health.rb
+++ b/lib/i18n/tasks/command/commands/health.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module Commands
@@ -8,7 +9,7 @@ module Health
         cmd :health,
             pos:  '[locale ...]',
             desc: t('i18n_tasks.cmd.desc.health'),
-            args: [:locales, :out_format]
+            args: %i(locales out_format)
 
         def health(opt = {})
           forest = i18n.data_forest(opt[:locales])
diff --git a/lib/i18n/tasks/command/commands/meta.rb b/lib/i18n/tasks/command/commands/meta.rb
index db2667c1..3b964f78 100644
--- a/lib/i18n/tasks/command/commands/meta.rb
+++ b/lib/i18n/tasks/command/commands/meta.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module Commands
diff --git a/lib/i18n/tasks/command/commands/missing.rb b/lib/i18n/tasks/command/commands/missing.rb
index 1380f407..0a517f39 100644
--- a/lib/i18n/tasks/command/commands/missing.rb
+++ b/lib/i18n/tasks/command/commands/missing.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/command/collection'
 
 module I18n::Tasks
@@ -24,7 +25,7 @@ module Missing
         cmd :missing,
             pos:  '[locale ...]',
             desc: t('i18n_tasks.cmd.desc.missing'),
-            args: [:locales, :out_format, :missing_types]
+            args: %i(locales out_format missing_types)
 
         def missing(opt = {})
           forest = i18n.missing_keys(opt.slice(:locales, :base_locale, :missing_types))
diff --git a/lib/i18n/tasks/command/commands/tree.rb b/lib/i18n/tasks/command/commands/tree.rb
index 1e535bcb..1f64e90b 100644
--- a/lib/i18n/tasks/command/commands/tree.rb
+++ b/lib/i18n/tasks/command/commands/tree.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module Commands
@@ -19,7 +20,7 @@ def tree_translate(opts = {})
         cmd :tree_merge,
             pos:  '[[tree] [tree] ... (or stdin)]',
             desc: t('i18n_tasks.cmd.desc.tree_merge'),
-            args: [:data_format, :nostdin]
+            args: %i(data_format nostdin)
 
         def tree_merge(opts = {})
           print_forest merge_forests_stdin_and_pos!(opts), opts
@@ -28,7 +29,7 @@ def tree_merge(opts = {})
         cmd :tree_filter,
             pos:  '[pattern] [tree (or stdin)]',
             desc: t('i18n_tasks.cmd.desc.tree_filter'),
-            args: [:data_format, :pattern]
+            args: %i(data_format pattern)
 
         def tree_filter(opts = {})
           pattern = arg_or_pos! :pattern, opts
@@ -74,7 +75,7 @@ def tree_mv(opt = {})
         cmd :tree_subtract,
             pos:  '[[tree] [tree] ... (or stdin)]',
             desc: t('i18n_tasks.cmd.desc.tree_subtract'),
-            args: [:data_format, :nostdin]
+            args: %i(data_format nostdin)
 
         def tree_subtract(opt = {})
           forests = forests_stdin_and_pos! opt, 2
@@ -85,7 +86,7 @@ def tree_subtract(opt = {})
         cmd :tree_set_value,
             pos:  '[VALUE] [tree (or stdin)]',
             desc: t('i18n_tasks.cmd.desc.tree_set_value'),
-            args: [:value, :data_format, :nostdin, :pattern]
+            args: %i(value data_format nostdin pattern)
 
         def tree_set_value(opt = {})
           value       = arg_or_pos! :value, opt
diff --git a/lib/i18n/tasks/command/commands/usages.rb b/lib/i18n/tasks/command/commands/usages.rb
index c72dd218..307cef89 100644
--- a/lib/i18n/tasks/command/commands/usages.rb
+++ b/lib/i18n/tasks/command/commands/usages.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module Commands
@@ -12,7 +13,7 @@ module Usages
         cmd :find,
             pos:  '[pattern]',
             desc: t('i18n_tasks.cmd.desc.find'),
-            args: [:out_format, :pattern, :strict]
+            args: %i(out_format pattern strict)
 
         def find(opt = {})
           opt[:filter] ||= opt.delete(:pattern) || opt[:arguments].try(:first)
@@ -23,7 +24,7 @@ def find(opt = {})
         cmd :unused,
             pos:  '[locale ...]',
             desc: t('i18n_tasks.cmd.desc.unused'),
-            args: [:locales, :out_format, :strict]
+            args: %i(locales out_format strict)
 
         def unused(opt = {})
           forest = i18n.unused_keys(opt.slice(:locales, :strict))
@@ -34,7 +35,7 @@ def unused(opt = {})
         cmd :remove_unused,
             pos:  '[locale ...]',
             desc: t('i18n_tasks.cmd.desc.remove_unused'),
-            args: [:locales, :out_format, :strict, :confirm]
+            args: %i(locales out_format strict confirm)
 
         def remove_unused(opt = {})
           unused_keys = i18n.unused_keys(opt.slice(:locales, :strict))
diff --git a/lib/i18n/tasks/command/commands/xlsx.rb b/lib/i18n/tasks/command/commands/xlsx.rb
index f2bc3611..596275ff 100644
--- a/lib/i18n/tasks/command/commands/xlsx.rb
+++ b/lib/i18n/tasks/command/commands/xlsx.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module Commands
diff --git a/lib/i18n/tasks/command/dsl.rb b/lib/i18n/tasks/command/dsl.rb
index 44fcf16d..a9d8e0d8 100644
--- a/lib/i18n/tasks/command/dsl.rb
+++ b/lib/i18n/tasks/command/dsl.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module DSL
diff --git a/lib/i18n/tasks/command/option_parsers/enum.rb b/lib/i18n/tasks/command/option_parsers/enum.rb
index 21bd4e6d..234aac08 100644
--- a/lib/i18n/tasks/command/option_parsers/enum.rb
+++ b/lib/i18n/tasks/command/option_parsers/enum.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module OptionParsers
diff --git a/lib/i18n/tasks/command/option_parsers/locale.rb b/lib/i18n/tasks/command/option_parsers/locale.rb
index 1e13756e..e93286e4 100644
--- a/lib/i18n/tasks/command/option_parsers/locale.rb
+++ b/lib/i18n/tasks/command/option_parsers/locale.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Command
     module OptionParsers
@@ -39,7 +40,7 @@ def call(vals, context)
             if vals == %w(all) || vals.blank?
               context.locales
             else
-              move_base_locale_to_front! vals.map { |v| v == 'base' ? context.base_locale : v }, context.base_locale
+              move_base_locale_to_front!(vals.map { |v| v == 'base' ? context.base_locale : v }, context.base_locale)
             end.tap do |locales|
               locales.each { |locale| validate! locale }
             end
diff --git a/lib/i18n/tasks/command/options/common.rb b/lib/i18n/tasks/command/options/common.rb
index 8e06c2ba..341cbf05 100644
--- a/lib/i18n/tasks/command/options/common.rb
+++ b/lib/i18n/tasks/command/options/common.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/command/dsl'
 
 module I18n::Tasks
diff --git a/lib/i18n/tasks/command/options/data.rb b/lib/i18n/tasks/command/options/data.rb
index 29320e98..1a4e05a4 100644
--- a/lib/i18n/tasks/command/options/data.rb
+++ b/lib/i18n/tasks/command/options/data.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/command/option_parsers/enum'
 
 module I18n::Tasks
diff --git a/lib/i18n/tasks/command/options/locales.rb b/lib/i18n/tasks/command/options/locales.rb
index 6807e032..63c7a60e 100644
--- a/lib/i18n/tasks/command/options/locales.rb
+++ b/lib/i18n/tasks/command/options/locales.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/command/option_parsers/locale'
 
 module I18n::Tasks
diff --git a/lib/i18n/tasks/command_error.rb b/lib/i18n/tasks/command_error.rb
index cc1e30e8..80510166 100644
--- a/lib/i18n/tasks/command_error.rb
+++ b/lib/i18n/tasks/command_error.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n
   module Tasks
     # When this type of error is caught:
diff --git a/lib/i18n/tasks/commands.rb b/lib/i18n/tasks/commands.rb
index 0c2b6936..c2f03c41 100644
--- a/lib/i18n/tasks/commands.rb
+++ b/lib/i18n/tasks/commands.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/command/dsl'
 require 'i18n/tasks/command/collection'
 require 'i18n/tasks/command/commands/health'
diff --git a/lib/i18n/tasks/configuration.rb b/lib/i18n/tasks/configuration.rb
index 0b981386..e5155b51 100644
--- a/lib/i18n/tasks/configuration.rb
+++ b/lib/i18n/tasks/configuration.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks::Configuration # rubocop:disable Metrics/ModuleLength
   DEFAULTS = {
     base_locale:     'en',
diff --git a/lib/i18n/tasks/console_context.rb b/lib/i18n/tasks/console_context.rb
index 2e85eedd..abeb2183 100644
--- a/lib/i18n/tasks/console_context.rb
+++ b/lib/i18n/tasks/console_context.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   class ConsoleContext < BaseTask
     def to_s
diff --git a/lib/i18n/tasks/data.rb b/lib/i18n/tasks/data.rb
index 0704aa93..1769a75b 100644
--- a/lib/i18n/tasks/data.rb
+++ b/lib/i18n/tasks/data.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/data/file_system'
 
 module I18n::Tasks
diff --git a/lib/i18n/tasks/data/adapter/json_adapter.rb b/lib/i18n/tasks/data/adapter/json_adapter.rb
index 53ed7377..67f2bf4c 100644
--- a/lib/i18n/tasks/data/adapter/json_adapter.rb
+++ b/lib/i18n/tasks/data/adapter/json_adapter.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'json'
 
 module I18n::Tasks
diff --git a/lib/i18n/tasks/data/adapter/yaml_adapter.rb b/lib/i18n/tasks/data/adapter/yaml_adapter.rb
index c8251def..98e3b6ae 100644
--- a/lib/i18n/tasks/data/adapter/yaml_adapter.rb
+++ b/lib/i18n/tasks/data/adapter/yaml_adapter.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'yaml'
 module I18n::Tasks
   module Data
diff --git a/lib/i18n/tasks/data/file_formats.rb b/lib/i18n/tasks/data/file_formats.rb
index ad3dc73f..70b60694 100644
--- a/lib/i18n/tasks/data/file_formats.rb
+++ b/lib/i18n/tasks/data/file_formats.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'fileutils'
 
 module I18n
diff --git a/lib/i18n/tasks/data/file_system.rb b/lib/i18n/tasks/data/file_system.rb
index 41e8ef1a..c2fb6eff 100644
--- a/lib/i18n/tasks/data/file_system.rb
+++ b/lib/i18n/tasks/data/file_system.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/data/file_system_base'
 require 'i18n/tasks/data/adapter/json_adapter'
 require 'i18n/tasks/data/adapter/yaml_adapter'
diff --git a/lib/i18n/tasks/data/file_system_base.rb b/lib/i18n/tasks/data/file_system_base.rb
index e59aa204..611d7aab 100644
--- a/lib/i18n/tasks/data/file_system_base.rb
+++ b/lib/i18n/tasks/data/file_system_base.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/data/tree/node'
 require 'i18n/tasks/data/router/pattern_router'
 require 'i18n/tasks/data/router/conservative_router'
diff --git a/lib/i18n/tasks/data/router/conservative_router.rb b/lib/i18n/tasks/data/router/conservative_router.rb
index e881770f..8e79a0f1 100644
--- a/lib/i18n/tasks/data/router/conservative_router.rb
+++ b/lib/i18n/tasks/data/router/conservative_router.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/data/router/pattern_router'
 
 module I18n::Tasks
diff --git a/lib/i18n/tasks/data/router/pattern_router.rb b/lib/i18n/tasks/data/router/pattern_router.rb
index 4228f69f..c3e6fb4b 100644
--- a/lib/i18n/tasks/data/router/pattern_router.rb
+++ b/lib/i18n/tasks/data/router/pattern_router.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/key_pattern_matching'
 require 'i18n/tasks/data/tree/node'
 
diff --git a/lib/i18n/tasks/data/tree/siblings.rb b/lib/i18n/tasks/data/tree/siblings.rb
index e5e31e95..48f343cb 100644
--- a/lib/i18n/tasks/data/tree/siblings.rb
+++ b/lib/i18n/tasks/data/tree/siblings.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'set'
 require 'i18n/tasks/split_key'
 require 'i18n/tasks/data/tree/nodes'
diff --git a/lib/i18n/tasks/data/tree/traversal.rb b/lib/i18n/tasks/data/tree/traversal.rb
index 02bd60e9..2b7e02db 100644
--- a/lib/i18n/tasks/data/tree/traversal.rb
+++ b/lib/i18n/tasks/data/tree/traversal.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'set'
 
 module I18n::Tasks
diff --git a/lib/i18n/tasks/google_translation.rb b/lib/i18n/tasks/google_translation.rb
index 6e829c99..a10e9906 100644
--- a/lib/i18n/tasks/google_translation.rb
+++ b/lib/i18n/tasks/google_translation.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'easy_translate'
 require 'i18n/tasks/html_keys'
 
diff --git a/lib/i18n/tasks/html_keys.rb b/lib/i18n/tasks/html_keys.rb
index 5fbe1d97..959829d3 100644
--- a/lib/i18n/tasks/html_keys.rb
+++ b/lib/i18n/tasks/html_keys.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module HtmlKeys
     HTML_KEY_PATTERN = /[.\-_]html\z/
diff --git a/lib/i18n/tasks/ignore_keys.rb b/lib/i18n/tasks/ignore_keys.rb
index cc0f0f3e..aa627214 100644
--- a/lib/i18n/tasks/ignore_keys.rb
+++ b/lib/i18n/tasks/ignore_keys.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks::IgnoreKeys
   # whether to ignore the key
   # will also apply global ignore rules
diff --git a/lib/i18n/tasks/key_pattern_matching.rb b/lib/i18n/tasks/key_pattern_matching.rb
index 90e0612d..3aa76f74 100644
--- a/lib/i18n/tasks/key_pattern_matching.rb
+++ b/lib/i18n/tasks/key_pattern_matching.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'strscan'
 
 module I18n::Tasks::KeyPatternMatching
diff --git a/lib/i18n/tasks/locale_list.rb b/lib/i18n/tasks/locale_list.rb
index f7ef6699..347496b0 100644
--- a/lib/i18n/tasks/locale_list.rb
+++ b/lib/i18n/tasks/locale_list.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module LocaleList
     module_function
diff --git a/lib/i18n/tasks/locale_pathname.rb b/lib/i18n/tasks/locale_pathname.rb
index 9c04fb26..d83fc208 100644
--- a/lib/i18n/tasks/locale_pathname.rb
+++ b/lib/i18n/tasks/locale_pathname.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module LocalePathname
     class << self
diff --git a/lib/i18n/tasks/logging.rb b/lib/i18n/tasks/logging.rb
index 4e8d382f..56ebd388 100644
--- a/lib/i18n/tasks/logging.rb
+++ b/lib/i18n/tasks/logging.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks::Logging
   module_function
 
@@ -10,9 +11,7 @@ def warn_deprecated(message)
   end
 
   def log_verbose(message = nil)
-    if ::I18n::Tasks.verbose?
-      log_stderr Rainbow(message || yield).blue.bright
-    end
+    log_stderr Rainbow(message || yield).blue.bright if ::I18n::Tasks.verbose?
   end
 
   def log_warn(message)
diff --git a/lib/i18n/tasks/missing_keys.rb b/lib/i18n/tasks/missing_keys.rb
index 6887f7e1..85d63639 100644
--- a/lib/i18n/tasks/missing_keys.rb
+++ b/lib/i18n/tasks/missing_keys.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'set'
 module I18n::Tasks
   module MissingKeys
diff --git a/lib/i18n/tasks/plural_keys.rb b/lib/i18n/tasks/plural_keys.rb
index 6112bf56..c4c26ca7 100644
--- a/lib/i18n/tasks/plural_keys.rb
+++ b/lib/i18n/tasks/plural_keys.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'set'
 module I18n::Tasks::PluralKeys
   PLURAL_KEY_SUFFIXES = Set.new %w(zero one two few many other)
diff --git a/lib/i18n/tasks/rainbow_utils.rb b/lib/i18n/tasks/rainbow_utils.rb
index 6aaf26e9..afc7a565 100644
--- a/lib/i18n/tasks/rainbow_utils.rb
+++ b/lib/i18n/tasks/rainbow_utils.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module I18n
   module Tasks
     module RainbowUtils
diff --git a/lib/i18n/tasks/references.rb b/lib/i18n/tasks/references.rb
index 57be42d5..a02391f5 100644
--- a/lib/i18n/tasks/references.rb
+++ b/lib/i18n/tasks/references.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module References
     # Given a raw usage tree and a tree of reference keys in the data, return 3 trees:
diff --git a/lib/i18n/tasks/reports/base.rb b/lib/i18n/tasks/reports/base.rb
index 33c24776..c758e7e4 100644
--- a/lib/i18n/tasks/reports/base.rb
+++ b/lib/i18n/tasks/reports/base.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks::Reports
   class Base
     include I18n::Tasks::Logging
diff --git a/lib/i18n/tasks/reports/spreadsheet.rb b/lib/i18n/tasks/reports/spreadsheet.rb
index 6bbb4bfa..9b1a0f51 100644
--- a/lib/i18n/tasks/reports/spreadsheet.rb
+++ b/lib/i18n/tasks/reports/spreadsheet.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/reports/base'
 require 'fileutils'
 
diff --git a/lib/i18n/tasks/reports/terminal.rb b/lib/i18n/tasks/reports/terminal.rb
index 2b5f3b78..6dc9152b 100644
--- a/lib/i18n/tasks/reports/terminal.rb
+++ b/lib/i18n/tasks/reports/terminal.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/reports/base'
 require 'i18n/tasks/rainbow_utils'
 require 'terminal-table'
@@ -6,7 +7,7 @@ module I18n
   module Tasks
     module Reports
       class Terminal < Base # rubocop:disable Metrics/ClassLength
-        def missing_keys(forest = task.missing_keys)
+        def missing_keys(forest = task.missing_keys) # rubocop:disable Metrics/AbcSize
           forest = collapse_missing_tree! forest
           if forest.present?
             print_title missing_title(forest)
@@ -105,7 +106,8 @@ def format_key(key, data)
             from, to = data[:ref_info]
             resolved = key[0...to.length]
             after    = key[to.length..-1]
-            "  #{Rainbow(from).yellow}#{Rainbow(after).cyan}\n#{Rainbow('⮕').yellow.bright} #{Rainbow(resolved).yellow.bright}"
+            "  #{Rainbow(from).yellow}#{Rainbow(after).cyan}\n" \
+            "#{Rainbow('⮕').yellow.bright} #{Rainbow(resolved).yellow.bright}"
           else
             Rainbow(key).cyan
           end
@@ -152,7 +154,8 @@ def print_locale_key_value_data_table(locale_key_value_datas)
         end
 
         def print_title(title)
-          log_stderr "#{Rainbow(title.strip).bright} #{I18n::Tasks::RainbowUtils.faint_color('|')} #{"i18n-tasks v#{I18n::Tasks::VERSION}"}"
+          log_stderr "#{Rainbow(title.strip).bright} #{I18n::Tasks::RainbowUtils.faint_color('|')} " \
+                     "#{"i18n-tasks v#{I18n::Tasks::VERSION}"}"
         end
 
         def print_success(message)
diff --git a/lib/i18n/tasks/scanners/file_scanner.rb b/lib/i18n/tasks/scanners/file_scanner.rb
index 6c49e757..70ab8260 100644
--- a/lib/i18n/tasks/scanners/file_scanner.rb
+++ b/lib/i18n/tasks/scanners/file_scanner.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/scanner'
 
 module I18n::Tasks::Scanners
diff --git a/lib/i18n/tasks/scanners/files/caching_file_finder.rb b/lib/i18n/tasks/scanners/files/caching_file_finder.rb
index 11a8e09b..bc34e8e7 100644
--- a/lib/i18n/tasks/scanners/files/caching_file_finder.rb
+++ b/lib/i18n/tasks/scanners/files/caching_file_finder.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/files/file_finder'
 module I18n::Tasks::Scanners::Files
   # Finds the files in the specified search paths with support for exclusion / inclusion patterns.
diff --git a/lib/i18n/tasks/scanners/files/caching_file_finder_provider.rb b/lib/i18n/tasks/scanners/files/caching_file_finder_provider.rb
index 2e764c5f..a7981fdf 100644
--- a/lib/i18n/tasks/scanners/files/caching_file_finder_provider.rb
+++ b/lib/i18n/tasks/scanners/files/caching_file_finder_provider.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/files/caching_file_finder'
 
 module I18n::Tasks::Scanners::Files
diff --git a/lib/i18n/tasks/scanners/files/caching_file_reader.rb b/lib/i18n/tasks/scanners/files/caching_file_reader.rb
index c6948479..1d230df4 100644
--- a/lib/i18n/tasks/scanners/files/caching_file_reader.rb
+++ b/lib/i18n/tasks/scanners/files/caching_file_reader.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/files/file_reader'
 module I18n::Tasks::Scanners::Files
   # Reads the files in 'rb' mode and UTF-8 encoding.
diff --git a/lib/i18n/tasks/scanners/files/file_finder.rb b/lib/i18n/tasks/scanners/files/file_finder.rb
index 010afd0a..af1befbb 100644
--- a/lib/i18n/tasks/scanners/files/file_finder.rb
+++ b/lib/i18n/tasks/scanners/files/file_finder.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks::Scanners::Files
   # Finds the files in the specified search paths with support for exclusion / inclusion patterns.
   #
diff --git a/lib/i18n/tasks/scanners/files/file_reader.rb b/lib/i18n/tasks/scanners/files/file_reader.rb
index adc8bf45..5d4c6ea4 100644
--- a/lib/i18n/tasks/scanners/files/file_reader.rb
+++ b/lib/i18n/tasks/scanners/files/file_reader.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks::Scanners::Files
   # Reads the files in 'rb' mode and UTF-8 encoding.
   #
diff --git a/lib/i18n/tasks/scanners/occurrence_from_position.rb b/lib/i18n/tasks/scanners/occurrence_from_position.rb
index 830ae9ef..5e2bd182 100644
--- a/lib/i18n/tasks/scanners/occurrence_from_position.rb
+++ b/lib/i18n/tasks/scanners/occurrence_from_position.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n
   module Tasks
     module Scanners
diff --git a/lib/i18n/tasks/scanners/pattern_mapper.rb b/lib/i18n/tasks/scanners/pattern_mapper.rb
index 2b729c70..ed52946b 100644
--- a/lib/i18n/tasks/scanners/pattern_mapper.rb
+++ b/lib/i18n/tasks/scanners/pattern_mapper.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/file_scanner'
 require 'i18n/tasks/scanners/relative_keys'
 require 'i18n/tasks/scanners/occurrence_from_position'
diff --git a/lib/i18n/tasks/scanners/pattern_scanner.rb b/lib/i18n/tasks/scanners/pattern_scanner.rb
index d2fbdf3f..563ca38e 100644
--- a/lib/i18n/tasks/scanners/pattern_scanner.rb
+++ b/lib/i18n/tasks/scanners/pattern_scanner.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/file_scanner'
 require 'i18n/tasks/scanners/relative_keys'
 require 'i18n/tasks/scanners/occurrence_from_position'
diff --git a/lib/i18n/tasks/scanners/pattern_with_scope_scanner.rb b/lib/i18n/tasks/scanners/pattern_with_scope_scanner.rb
index 76fa50e6..1a47baa1 100644
--- a/lib/i18n/tasks/scanners/pattern_with_scope_scanner.rb
+++ b/lib/i18n/tasks/scanners/pattern_with_scope_scanner.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/pattern_scanner'
 
 module I18n::Tasks::Scanners
diff --git a/lib/i18n/tasks/scanners/relative_keys.rb b/lib/i18n/tasks/scanners/relative_keys.rb
index 80538d47..7da5702a 100644
--- a/lib/i18n/tasks/scanners/relative_keys.rb
+++ b/lib/i18n/tasks/scanners/relative_keys.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n
   module Tasks
     module Scanners
diff --git a/lib/i18n/tasks/scanners/results/key_occurrences.rb b/lib/i18n/tasks/scanners/results/key_occurrences.rb
index 0703b934..66e17d65 100644
--- a/lib/i18n/tasks/scanners/results/key_occurrences.rb
+++ b/lib/i18n/tasks/scanners/results/key_occurrences.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/results/occurrence'
 
 module I18n::Tasks::Scanners::Results
diff --git a/lib/i18n/tasks/scanners/results/occurrence.rb b/lib/i18n/tasks/scanners/results/occurrence.rb
index 8fc2e79a..c2a46fc5 100644
--- a/lib/i18n/tasks/scanners/results/occurrence.rb
+++ b/lib/i18n/tasks/scanners/results/occurrence.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Scanners
     module Results
diff --git a/lib/i18n/tasks/scanners/ruby_ast_call_finder.rb b/lib/i18n/tasks/scanners/ruby_ast_call_finder.rb
index 9545d06c..864f5530 100644
--- a/lib/i18n/tasks/scanners/ruby_ast_call_finder.rb
+++ b/lib/i18n/tasks/scanners/ruby_ast_call_finder.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'ast'
 require 'set'
 module I18n::Tasks::Scanners
diff --git a/lib/i18n/tasks/scanners/ruby_ast_scanner.rb b/lib/i18n/tasks/scanners/ruby_ast_scanner.rb
index ddfe4c46..8ba3cc55 100644
--- a/lib/i18n/tasks/scanners/ruby_ast_scanner.rb
+++ b/lib/i18n/tasks/scanners/ruby_ast_scanner.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/file_scanner'
 require 'i18n/tasks/scanners/relative_keys'
 require 'i18n/tasks/scanners/ruby_ast_call_finder'
@@ -40,7 +41,7 @@ def scan_file(path)
         # transform_values is only available in ActiveSupport 4.2+
         h.each { |k, v| h[k] = v.first }
       end.invert
-      results + magic_comments.flat_map do |comment|
+      results + (magic_comments.flat_map do |comment|
         @parser.reset
         associated_node = comment_to_node[comment]
         @call_finder.collect_calls(
@@ -49,7 +50,7 @@ def scan_file(path)
           # method_name is not available at this stage
           send_node_to_key_occurrence(send_node, nil, location: associated_node || comment.location)
         end
-      end
+      end)
     rescue Exception => e # rubocop:disable Lint/RescueException
       raise ::I18n::Tasks::CommandError.new(e, "Error scanning #{path}: #{e.message}")
     end
diff --git a/lib/i18n/tasks/scanners/ruby_key_literals.rb b/lib/i18n/tasks/scanners/ruby_key_literals.rb
index d1d562d8..0f02ba6a 100644
--- a/lib/i18n/tasks/scanners/ruby_key_literals.rb
+++ b/lib/i18n/tasks/scanners/ruby_key_literals.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks::Scanners
   module RubyKeyLiterals
     LITERAL_RE = /:?".+?"|:?'.+?'|:\w+/
diff --git a/lib/i18n/tasks/scanners/scanner.rb b/lib/i18n/tasks/scanners/scanner.rb
index 363d1c5b..11ea0932 100644
--- a/lib/i18n/tasks/scanners/scanner.rb
+++ b/lib/i18n/tasks/scanners/scanner.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/results/key_occurrences'
 
 module I18n::Tasks::Scanners
diff --git a/lib/i18n/tasks/scanners/scanner_multiplexer.rb b/lib/i18n/tasks/scanners/scanner_multiplexer.rb
index 6921e21e..24b12e6e 100644
--- a/lib/i18n/tasks/scanners/scanner_multiplexer.rb
+++ b/lib/i18n/tasks/scanners/scanner_multiplexer.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks/scanners/scanner'
 
 module I18n::Tasks::Scanners
diff --git a/lib/i18n/tasks/split_key.rb b/lib/i18n/tasks/split_key.rb
index d26ddc53..5cafd133 100644
--- a/lib/i18n/tasks/split_key.rb
+++ b/lib/i18n/tasks/split_key.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n
   module Tasks
     module SplitKey
diff --git a/lib/i18n/tasks/stats.rb b/lib/i18n/tasks/stats.rb
index 0fd77b77..f8949af9 100644
--- a/lib/i18n/tasks/stats.rb
+++ b/lib/i18n/tasks/stats.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module Stats
     def forest_stats(forest)
diff --git a/lib/i18n/tasks/string_interpolation.rb b/lib/i18n/tasks/string_interpolation.rb
index 4dbb5d69..79e5ce77 100644
--- a/lib/i18n/tasks/string_interpolation.rb
+++ b/lib/i18n/tasks/string_interpolation.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n::Tasks
   module StringInterpolation
     module_function
diff --git a/lib/i18n/tasks/unused_keys.rb b/lib/i18n/tasks/unused_keys.rb
index 629ac6de..cb1f5e1b 100644
--- a/lib/i18n/tasks/unused_keys.rb
+++ b/lib/i18n/tasks/unused_keys.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'set'
 
 module I18n
@@ -13,11 +14,11 @@ def unused_keys(locales: nil, strict: nil)
       # @param [Boolean] strict if true, do not match dynamic keys
       def unused_tree(locale: base_locale, strict: nil)
         used_key_names = used_tree(strict: true).key_names
-        collapse_plural_nodes! data[locale].select_keys { |key, _node|
+        collapse_plural_nodes!(data[locale].select_keys do |key, _node|
           !ignore_key?(key, :unused) &&
             (strict || !used_in_expr?(key)) &&
             !used_key_names.include?(depluralize_key(key, locale))
-        }
+        end)
       end
     end
   end
diff --git a/lib/i18n/tasks/used_keys.rb b/lib/i18n/tasks/used_keys.rb
index f6264a54..253e52ee 100644
--- a/lib/i18n/tasks/used_keys.rb
+++ b/lib/i18n/tasks/used_keys.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'find'
 require 'i18n/tasks/scanners/pattern_with_scope_scanner'
 require 'i18n/tasks/scanners/ruby_ast_scanner'
@@ -56,7 +57,7 @@ def used_in_source_tree(key_filter: nil, strict: nil)
                 scanner(strict: strict).keys.freeze)
       if key_filter
         key_filter_re = compile_key_pattern(key_filter)
-        keys          = keys.reject { |k| k.key !~ key_filter_re }
+        keys          = keys.select { |k| k.key =~ key_filter_re }
       end
       Data::Tree::Node.new(
         key:      'used',
@@ -128,7 +129,7 @@ def caching_file_reader
 
     # @return [Boolean] whether the key is potentially used in a code expression such as `t("category.#{category_key}")`
     def used_in_expr?(key)
-      !!(key =~ expr_key_re) # rubocop:disable Style/DoubleNegation
+      !!(key =~ expr_key_re) # rubocop:disable Style/DoubleNegation,Style/InverseMethods
     end
 
     private
diff --git a/lib/i18n/tasks/version.rb b/lib/i18n/tasks/version.rb
index 10b4a691..5634defa 100644
--- a/lib/i18n/tasks/version.rb
+++ b/lib/i18n/tasks/version.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module I18n
   module Tasks
     VERSION = '0.9.12'
diff --git a/spec/bin_simplecov_helper.rb b/spec/bin_simplecov_helper.rb
index bb999302..df58358d 100644
--- a/spec/bin_simplecov_helper.rb
+++ b/spec/bin_simplecov_helper.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 if ENV['COVERAGE'] && !%w(rbx jruby).include?(RUBY_ENGINE)
   ENV['SIMPLECOV_NO_DEFAULTS'] = '1'
   require 'simplecov'
diff --git a/spec/commands/data_commands_spec.rb b/spec/commands/data_commands_spec.rb
index 6b40d83d..f1bb7338 100644
--- a/spec/commands/data_commands_spec.rb
+++ b/spec/commands/data_commands_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'Data commands' do
diff --git a/spec/commands/missing_commands_spec.rb b/spec/commands/missing_commands_spec.rb
index f7266689..ea4a2838 100644
--- a/spec/commands/missing_commands_spec.rb
+++ b/spec/commands/missing_commands_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'Missing commands' do
diff --git a/spec/commands/tree_commands_spec.rb b/spec/commands/tree_commands_spec.rb
index ea315f0f..0a550702 100644
--- a/spec/commands/tree_commands_spec.rb
+++ b/spec/commands/tree_commands_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'Tree commands' do
diff --git a/spec/conservative_router_spec.rb b/spec/conservative_router_spec.rb
index 3f269cfa..76d9cf4a 100644
--- a/spec/conservative_router_spec.rb
+++ b/spec/conservative_router_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'Conservative router' do
diff --git a/spec/file_system_data_spec.rb b/spec/file_system_data_spec.rb
index 3c6d985a..dcfe88d6 100644
--- a/spec/file_system_data_spec.rb
+++ b/spec/file_system_data_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'File system i18n' do
diff --git a/spec/google_translate_spec.rb b/spec/google_translate_spec.rb
index 941a39df..183ae11a 100644
--- a/spec/google_translate_spec.rb
+++ b/spec/google_translate_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/commands'
 
diff --git a/spec/i18n_spec.rb b/spec/i18n_spec.rb
index 31d69eac..6a3e5cb4 100644
--- a/spec/i18n_spec.rb
+++ b/spec/i18n_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'I18n' do
diff --git a/spec/i18n_tasks_spec.rb b/spec/i18n_tasks_spec.rb
index fb66b10b..f7bd8e35 100644
--- a/spec/i18n_tasks_spec.rb
+++ b/spec/i18n_tasks_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'fileutils'
 require 'open3'
@@ -27,9 +28,9 @@
             expect(status).to be_success
             expect(out).to be_empty
             expect(err.lines.first.chomp).to eq('Usage: i18n-tasks [command] [options]')
-            expect(err).to include('Available commands', 'add-missing')
+            expect(err).to a_string_including('Available commands', 'add-missing')
             # a task from a plugin
-            expect(err).to include('greet')
+            expect(err).to a_string_including('greet')
           end,
           proc do
             out, err, status = Open3.capture3(env, 'bundle exec ../../bin/i18n-tasks --version')
@@ -93,11 +94,11 @@
     end
     it 'detects missing' do
       es_keys = expected_missing_keys_diff.grep(/^es\./) +
-                expected_missing_keys_in_source.map { |k| k[0] != '⮕' ? "es.#{k}" : k }
+                (expected_missing_keys_in_source.map { |k| k[0] != '⮕' ? "es.#{k}" : k })
       out, result = run_cmd_capture_stdout_and_result 'missing'
       expect(result).to eq :exit_1
       expect(out).to be_i18n_keys(expected_missing_keys_diff +
-                                      expected_missing_keys_in_source.map { |k| k[0] != '⮕' ? "all.#{k}" : k })
+                                      (expected_missing_keys_in_source.map { |k| k[0] != '⮕' ? "all.#{k}" : k }))
       expect(run_cmd('missing', '-les')).to be_i18n_keys es_keys
       expect(run_cmd('missing', 'es')).to be_i18n_keys es_keys
     end
diff --git a/spec/key_pattern_matching_spec.rb b/spec/key_pattern_matching_spec.rb
index 487ec0a7..47d1b925 100644
--- a/spec/key_pattern_matching_spec.rb
+++ b/spec/key_pattern_matching_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'Key pattern' do
diff --git a/spec/locale_pathname_spec.rb b/spec/locale_pathname_spec.rb
index 70d0d871..f4ddb797 100644
--- a/spec/locale_pathname_spec.rb
+++ b/spec/locale_pathname_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'LocalePathname' do
diff --git a/spec/locale_tree/siblings_spec.rb b/spec/locale_tree/siblings_spec.rb
index 82ad7597..abe976a1 100644
--- a/spec/locale_tree/siblings_spec.rb
+++ b/spec/locale_tree/siblings_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'Tree siblings / forest' do
diff --git a/spec/pattern_scanner_spec.rb b/spec/pattern_scanner_spec.rb
index be1e044f..e5bffbd7 100644
--- a/spec/pattern_scanner_spec.rb
+++ b/spec/pattern_scanner_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'PatternScanner' do
diff --git a/spec/pattern_with_scope_scanner_spec.rb b/spec/pattern_with_scope_scanner_spec.rb
index a591fc8d..a3a40fae 100644
--- a/spec/pattern_with_scope_scanner_spec.rb
+++ b/spec/pattern_with_scope_scanner_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'PatternWithScopeScanner' do
diff --git a/spec/plural_keys_spec.rb b/spec/plural_keys_spec.rb
index 66eaef67..a419a4c2 100644
--- a/spec/plural_keys_spec.rb
+++ b/spec/plural_keys_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'Plural keys' do
diff --git a/spec/references_spec.rb b/spec/references_spec.rb
index 25c1e1f3..7547eee4 100644
--- a/spec/references_spec.rb
+++ b/spec/references_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'Reference keys' do
diff --git a/spec/relative_keys_spec.rb b/spec/relative_keys_spec.rb
index bd566aa3..95555b2c 100644
--- a/spec/relative_keys_spec.rb
+++ b/spec/relative_keys_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/scanners/relative_keys'
 
diff --git a/spec/scanners/files/caching_file_finder_provider_spec.rb b/spec/scanners/files/caching_file_finder_provider_spec.rb
index 6f85ef37..8404d4d5 100644
--- a/spec/scanners/files/caching_file_finder_provider_spec.rb
+++ b/spec/scanners/files/caching_file_finder_provider_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/scanners/files/caching_file_finder_provider'
 
diff --git a/spec/scanners/files/caching_file_finder_spec.rb b/spec/scanners/files/caching_file_finder_spec.rb
index bb1347af..40002035 100644
--- a/spec/scanners/files/caching_file_finder_spec.rb
+++ b/spec/scanners/files/caching_file_finder_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/scanners/files/caching_file_finder'
 
@@ -12,9 +13,9 @@
         TestCodebase.setup(test_files.each_with_object({}) { |f, h| h[f] = '' })
         TestCodebase.in_test_app_dir do
           finder = I18n::Tasks::Scanners::Files::CachingFileFinder.new
-          expect(finder.find_files).to eq test_files.map { |f| File.join('.', f) }
+          expect(finder.find_files).to eq(test_files.map { |f| File.join('.', f) })
           TestCodebase.teardown
-          expect(finder.find_files).to eq test_files.map { |f| File.join('.', f) }
+          expect(finder.find_files).to eq(test_files.map { |f| File.join('.', f) })
         end
       ensure
         TestCodebase.teardown
@@ -28,9 +29,9 @@
         TestCodebase.setup(test_files.each_with_object({}) { |f, h| h[f] = '' })
         TestCodebase.in_test_app_dir do
           finder = I18n::Tasks::Scanners::Files::CachingFileFinder.new
-          expect(finder.traverse_files { |f| f }).to eq test_files.map { |f| File.join('.', f) }
+          expect(finder.traverse_files { |f| f }).to eq(test_files.map { |f| File.join('.', f) })
           TestCodebase.teardown
-          expect(finder.traverse_files { |f| f }).to eq test_files.map { |f| File.join('.', f) }
+          expect(finder.traverse_files { |f| f }).to eq(test_files.map { |f| File.join('.', f) })
         end
       ensure
         TestCodebase.teardown
diff --git a/spec/scanners/files/caching_file_reader_spec.rb b/spec/scanners/files/caching_file_reader_spec.rb
index 4b676dd0..a2177880 100644
--- a/spec/scanners/files/caching_file_reader_spec.rb
+++ b/spec/scanners/files/caching_file_reader_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/scanners/files/caching_file_reader'
 
diff --git a/spec/scanners/files/file_finder_spec.rb b/spec/scanners/files/file_finder_spec.rb
index cd4ea6ea..6f711d9b 100644
--- a/spec/scanners/files/file_finder_spec.rb
+++ b/spec/scanners/files/file_finder_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/scanners/files/file_finder'
 
@@ -15,26 +16,28 @@
   describe '#find_files' do
     it 'finds all the files in the current directory with default options' do
       finder = I18n::Tasks::Scanners::Files::FileFinder.new
-      expect(finder.find_files).to eq test_files.map { |f| File.join('.', f) }
+      expect(finder.find_files).to eq(test_files.map { |f| File.join('.', f) })
     end
 
     it 'finds only the files in paths' do
       finder = I18n::Tasks::Scanners::Files::FileFinder.new(paths: %w(a/a a/b/a.txt))
-      expect(finder.find_files).to eq test_files.select { |f| f.start_with?('a/a/') || f == 'a/b/a.txt' }
+      expect(finder.find_files).to eq(test_files.select { |f| f.start_with?('a/a/') || f == 'a/b/a.txt' })
     end
 
     it 'find only the files specified by the inclusion patterns' do
       finder = I18n::Tasks::Scanners::Files::FileFinder.new(
         paths: %w(a), only: %w(a/a/**)
       )
-      expect(finder.find_files).to eq test_files.select { |f| f.start_with?('a/a/') }
+      expect(finder.find_files).to eq(test_files.select { |f| f.start_with?('a/a/') })
     end
 
     it 'finds only the files not specified by the exclusion patterns' do
       finder = I18n::Tasks::Scanners::Files::FileFinder.new(
         exclude: %w(./a/a/**)
       )
-      expect(finder.find_files).to eq test_files.select { |f| !f.start_with?('a/a/') }.map { |f| File.join('.', f) }
+      expect(finder.find_files).to(
+        eq(test_files.reject { |f| f.start_with?('a/a/') }.map { |f| File.join('.', f) })
+      )
     end
   end
 
diff --git a/spec/scanners/files/file_reader_spec.rb b/spec/scanners/files/file_reader_spec.rb
index 208d8e76..65068590 100644
--- a/spec/scanners/files/file_reader_spec.rb
+++ b/spec/scanners/files/file_reader_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/scanners/files/file_reader'
 
diff --git a/spec/scanners/pattern_mapper_spec.rb b/spec/scanners/pattern_mapper_spec.rb
index afbe304b..eaf4d619 100644
--- a/spec/scanners/pattern_mapper_spec.rb
+++ b/spec/scanners/pattern_mapper_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/scanners/pattern_mapper'
 
diff --git a/spec/scanners/scanner_multiplexer_spec.rb b/spec/scanners/scanner_multiplexer_spec.rb
index 7205c2a1..890d69d8 100644
--- a/spec/scanners/scanner_multiplexer_spec.rb
+++ b/spec/scanners/scanner_multiplexer_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 require 'i18n/tasks/scanners/scanner_multiplexer'
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 449ef123..7c9f88ac 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 if ENV['COVERAGE'] && !%w(rbx jruby).include?(RUBY_ENGINE)
   require 'simplecov'
   SimpleCov.command_name 'RSpec'
diff --git a/spec/split_key_spec.rb b/spec/split_key_spec.rb
index d07b5aa8..bf4331e5 100644
--- a/spec/split_key_spec.rb
+++ b/spec/split_key_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'SplitKey' do
diff --git a/spec/support/capture_std.rb b/spec/support/capture_std.rb
index 93128a95..f8c01a63 100644
--- a/spec/support/capture_std.rb
+++ b/spec/support/capture_std.rb
@@ -19,22 +19,26 @@ module CaptureStd
 
   def capture_stderr
     return yield if ENV['NOSILENCE']
-    err = $stderr
-    $stderr = StringIO.new
-    yield
-    $stderr.string
-  ensure
-    $stderr = err
+    begin
+      err = $stderr
+      $stderr = StringIO.new
+      yield
+      $stderr.string
+    ensure
+      $stderr = err
+    end
   end
 
   def capture_stdout
     return yield if ENV['NOSILENCE']
-    out = $stdout
-    $stdout = StringIO.new
-    yield
-    $stdout.string
-  ensure
-    $stdout = out
+    begin
+      out = $stdout
+      $stdout = StringIO.new
+      yield
+      $stdout.string
+    ensure
+      $stdout = out
+    end
   end
 
   def silence_stderr(&block)
diff --git a/spec/support/fixtures.rb b/spec/support/fixtures.rb
index 0a911b4e..243336c9 100644
--- a/spec/support/fixtures.rb
+++ b/spec/support/fixtures.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 # quick'n'dirty fixture loader
 module FixturesSupport
   def fixtures_contents
diff --git a/spec/support/i18n_tasks_output_matcher.rb b/spec/support/i18n_tasks_output_matcher.rb
index 913c7bcf..a91b1385 100644
--- a/spec/support/i18n_tasks_output_matcher.rb
+++ b/spec/support/i18n_tasks_output_matcher.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 RSpec::Matchers.define :be_i18n_keys do |expected|
   def locale_re
     /^\w{2}\b/
diff --git a/spec/support/key_pattern_matcher.rb b/spec/support/key_pattern_matcher.rb
index b6394588..01311cfe 100644
--- a/spec/support/key_pattern_matcher.rb
+++ b/spec/support/key_pattern_matcher.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 RSpec::Matchers.define :match_key do |key|
   include I18n::Tasks::KeyPatternMatching
 
diff --git a/spec/support/keys_and_occurrences.rb b/spec/support/keys_and_occurrences.rb
index 4526bb49..9f08b25b 100644
--- a/spec/support/keys_and_occurrences.rb
+++ b/spec/support/keys_and_occurrences.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module KeysAndOccurrences
   # rubocop:disable Metrics/ParameterLists
   def make_occurrence(path: '', line: '', pos: 1, line_pos: 1, line_num: 1, raw_key: nil)
diff --git a/spec/support/strip_ansi_escape.rb b/spec/support/strip_ansi_escape.rb
index b4fcd58f..2dc2d939 100644
--- a/spec/support/strip_ansi_escape.rb
+++ b/spec/support/strip_ansi_escape.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Stolen from https://github.com/sickill/rainbow/pull/54
 def strip_ansi_escape(string)
   string.gsub(/\e\[[0-9;]*[a-zA-Z]/, '')
diff --git a/spec/support/test_codebase.rb b/spec/support/test_codebase.rb
index 2e6a2d40..3fda798a 100644
--- a/spec/support/test_codebase.rb
+++ b/spec/support/test_codebase.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'fileutils'
 require 'yaml'
 require_relative 'capture_std'
diff --git a/spec/support/trees.rb b/spec/support/trees.rb
index 385d3a8a..dec772c9 100644
--- a/spec/support/trees.rb
+++ b/spec/support/trees.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module Trees
   def expect_node_key_data(node, key, data)
     expect(node.full_key(root: false)).to eq key
diff --git a/spec/used_keys_spec.rb b/spec/used_keys_spec.rb
index 07439d7d..195f7128 100644
--- a/spec/used_keys_spec.rb
+++ b/spec/used_keys_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'spec_helper'
 
 RSpec.describe 'UsedKeys' do
diff --git a/templates/rspec/i18n_spec.rb b/templates/rspec/i18n_spec.rb
index b2b2e617..4090059c 100644
--- a/templates/rspec/i18n_spec.rb
+++ b/templates/rspec/i18n_spec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'i18n/tasks'
 
 RSpec.describe 'I18n' do