Update rubocop config from Rails

.rubocop.yml

@@ -1,5 +1,8 @@
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.2
+  # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
+  # to ignore them, so only the ones explicitly set in this file are enabled.
+  DisabledByDefault: true
   Exclude:
     - !ruby/regexp /(vendor|bundle|bin|db|tmp)\/.*/
   DisplayCopNames: true
@@ -9,60 +12,117 @@ AllCops:
   UseCache: true
   CacheRootDirectory: tmp
 
-Rails:
+# Prefer &&/|| over and/or.
+Style/AndOr:
   Enabled: true
 
-Style/Alias:
-  EnforcedStyle: prefer_alias
+# Do not use braces for hash literals when they are the last argument of a
+# method call.
+Style/BracesAroundHashParameters:
+  Enabled: true
 
+# Align `when` with `case`.
+Style/CaseIndentation:
+  Enabled: true
+
+# Align comments with method definitions.
+Style/CommentIndentation:
+  Enabled: true
+
+# No extra empty lines.
+Style/EmptyLines:
+  Enabled: true
+
+# In a regular class definition, no empty lines around the body.
+Style/EmptyLinesAroundClassBody:
+  Enabled: true
+
+# In a regular method definition, no empty lines around the body.
+Style/EmptyLinesAroundMethodBody:
+  Enabled: true
+
+# In a regular module definition, no empty lines around the body.
+Style/EmptyLinesAroundModuleBody:
+  Enabled: true
+
+# Use Ruby >= 1.9 syntax for hashes. Prefer { a: :b } over { :a => :b }.
+Style/HashSyntax:
+  Enabled: true
+
+# Method definitions after `private` or `protected` isolated calls need one
+# extra level of indentation.
+Style/IndentationConsistency:
+  Enabled: true
+  EnforcedStyle: rails
+
+# Two spaces, no tabs (for indentation).
+Style/IndentationWidth:
+  Enabled: true
+
+Style/SpaceAfterColon:
+  Enabled: true
+
+Style/SpaceAfterComma:
+  Enabled: true
+
+Style/SpaceAroundEqualsInParameterDefault:
+  Enabled: true
+
+Style/SpaceAroundKeyword:
+  Enabled: true
+
+Style/SpaceAroundOperators:
+  Enabled: true
+
+Style/SpaceBeforeFirstArg:
+    Enabled: true
+
+# Defining a method with parameters needs parentheses.
+Style/MethodDefParentheses:
+  Enabled: true
+
+# Use `foo {}` not `foo{}`.
+Style/SpaceBeforeBlockBraces:
+  Enabled: true
+
+# Use `foo { bar }` not `foo {bar}`.
+Style/SpaceInsideBlockBraces:
+  Enabled: true
+
+# Use `{ a: 1 }` not `{a:1}`.
+Style/SpaceInsideHashLiteralBraces:
+  Enabled: true
+
+Style/SpaceInsideParens:
+  Enabled: true
+
+# Check quotes usage according to lint rule below.
 Style/StringLiterals:
-  EnforcedStyle: single_quotes
-
-Metrics/AbcSize:
-  Max: 15
-
-Metrics/ClassLength:
-  Max: 100
-  Exclude:
-    - test/**/*.rb
-
-Metrics/CyclomaticComplexity:
-  Max: 6
-
-Metrics/LineLength:
-  Max: 100
-
-Metrics/MethodLength:
-  Max: 10
-
-Metrics/PerceivedComplexity:
-  Max: 7
-
-Style/AlignParameters:
-  EnforcedStyle: with_fixed_indentation
-
-Style/ClassAndModuleChildren:
-  EnforcedStyle: nested
-
-Style/MissingElse:
   Enabled: true
-  EnforcedStyle: case
+  EnforcedStyle: double_quotes
 
-Style/EmptyElse:
-  EnforcedStyle: empty
-
-Style/MultilineOperationIndentation:
-  EnforcedStyle: indented
-
-Style/BlockDelimiters:
+# Detect hard tabs, no hard tabs.
+Style/Tab:
   Enabled: true
-  EnforcedStyle: line_count_based
 
-Style/SignalException:
-  EnforcedStyle: semantic
+# Blank lines should not have any spaces.
+Style/TrailingBlankLines:
+  Enabled: true
 
-Style/TrailingCommaInLiteral:
-  EnforcedStyleForMultiline: no_comma
+# No trailing whitespace.
+Style/TrailingWhitespace:
+  Enabled: true
 
-Style/DotPosition:
-  EnforcedStyle: leading
+# Use quotes for string literals when they are enough.
+Style/UnneededPercentQ:
+  Enabled: true
+
+# Align `end` with the matching keyword or starting expression except for
+# assignments, where it should be aligned with the LHS.
+Lint/EndAlignment:
+  Enabled: true
+  EnforcedStyleAlignWith: variable
+
+# Use my_method(my_arg) not my_method( my_arg ) or my_method my_arg.
+Lint/RequireParentheses:
+  Enabled: true

Gemfile

@@ -9,6 +9,6 @@ group :test do
 end
 
 group :development, :test do
-  gem 'rubocop', '~> 0.40.0', require: false
+  gem 'rubocop', '>= 0.47', require: false
   gem 'yard', require: false
 end

bin/rubocop

@@ -5,11 +5,12 @@
 #   bin/rubocop [file or path] [cli options]
 #
 # Options:
-#  Autocorrect    -A
-#  AutoGenConfig  -t
-#  Usage          -h,--help,help
+#  -A                      Autocorrect
+#  -t                      AutoGenConfig
+#  --update-config         Update config from Rails
+#  -h,--help,help          Usage
 
-set -e
+set -eou pipefail
 
 case $1 in
   -A)
@@ -26,6 +27,15 @@ case $1 in
      sed -ne '/^#/!q;s/.\{1,2\}//;1d;p' < "$0"
      ;;
 
+  --update-config)
+    curl -X GET https://raw.githubusercontent.com/rails/rails/master/.rubocop.yml -o .rubocop.yml
+    bundle check || bundle install --local || bundle install
+    echo "Current rubocop version is:"
+    bundle show rubocop
+    echo "Rails rubocop version is:"
+    curl -X GET https://raw.githubusercontent.com/rails/rails/master/Gemfile | grep rubocop
+    ;;
+
   *)
      # with no args, run vanilla rubocop
      # else assume we're passing in arbitrary arguments