Include and comply to relaxed Rubocop style

.gitignore

@@ -1,3 +1,4 @@
+.DS_Store
 /.bundle/
 /.yardoc
 /_yardoc/

.rubocop.yml

@@ -1,36 +1,9 @@
 AllCops:
   TargetRubyVersion: 2.3
 
-Style/Documentation:
-  Enabled: false
-
-Style/StringLiterals:
-  Enabled: false
-
-Style/FrozenStringLiteralComment:
-  Exclude:
-    - './bin/*'
-    - './exe/*'
-    - './Rakefile'
-    - './Gemfile'
-    - './*.gemspec'
+inherit_gem:
+  relaxed-rubocop: .rubocop.yml
 
 Metrics/BlockLength:
   Exclude:
-    - './*.gemspec'
-
-Metrics/LineLength:
-  Exclude:
-    - './*.gemspec'
-    - 'exe/fuel_surcharge'
-
-# Lint/AssignmentInCondition:
-#   Enabled: false
-
-Metrics/MethodLength:
-  Exclude:
-    - 'test/**/*.rb'
-
-Metrics/AbcSize:
-  Exclude:
-    - 'test/**/*.rb'
+    - "*.gemspec"

.travis.yml

@@ -18,4 +18,3 @@ rvm:
   - 2.4
   - 2.5
   - 2.6
-

Gemfile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }

Gemfile.lock

@@ -14,6 +14,7 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
+    ast (2.4.0)
     concurrent-ruby (1.1.3)
     domain_name (0.5.20180417)
       unf (>= 0.0.5, < 1.0.0)
@@ -40,16 +41,31 @@ GEM
     http_parser.rb (0.6.0)
     i18n (1.1.1)
       concurrent-ruby (~> 1.0)
+    jaro_winkler (1.5.1)
     minitest (5.11.3)
     minitest-stub_any_instance (1.0.2)
     multi_json (1.13.1)
     multipart-post (2.0.0)
     octokit (4.13.0)
       sawyer (~> 0.8.0, >= 0.5.3)
+    parallel (1.12.1)
+    parser (2.5.3.0)
+      ast (~> 2.4.0)
+    powerpack (0.1.2)
     public_suffix (3.0.3)
     rainbow (3.0.0)
     rake (12.3.2)
+    relaxed-rubocop (2.3.1)
     retriable (2.1.0)
+    rubocop (0.62.0)
+      jaro_winkler (~> 1.5.1)
+      parallel (~> 1.10)
+      parser (>= 2.5, != 2.5.1.1)
+      powerpack (~> 0.1)
+      rainbow (>= 2.2.2, < 4.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (~> 1.4.0)
+    ruby-progressbar (1.10.0)
     sawyer (0.8.1)
       addressable (>= 2.3.5, < 2.6)
       faraday (~> 0.8, < 1.0)
@@ -59,17 +75,20 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.5)
+    unicode-display_width (1.4.1)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (~> 1.17)
+  bundler (>= 1.17)
   fuel_surcharge!
   github_changelog_generator (~> 1.14)
   minitest (~> 5.0)
   minitest-stub_any_instance (~> 1.0)
   rake (~> 12.3)
+  relaxed-rubocop (~> 2.3.1)
+  rubocop (~> 0.62)
 
 BUNDLED WITH
-   2.0.0
+   2.0.1

Rakefile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
 require "github_changelog_generator/task"
 require "rake/testtask"

bin/console

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require "bundler/setup"
 require "fuel_surcharge"

exe/fuel_surcharge

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require "fuel_surcharge"
 

fuel_surcharge.gemspec

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 lib = File.expand_path("lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
@@ -39,9 +41,12 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "http", "~> 4.0"
 
-  spec.add_development_dependency "bundler", "~> 1.17"
+  spec.add_development_dependency "bundler", ">= 1.17"
   spec.add_development_dependency "github_changelog_generator", "~> 1.14"
   spec.add_development_dependency "minitest", "~> 5.0"
   spec.add_development_dependency "minitest-stub_any_instance", "~> 1.0"
   spec.add_development_dependency "rake", "~> 12.3"
+  # We it is mature, we'll switch to the "standard" gem
+  spec.add_development_dependency "relaxed-rubocop", "~> 2.3.1"
+  spec.add_development_dependency "rubocop", "~> 0.62"
 end

lib/fuel_surcharge/string_formatter.rb

@@ -6,9 +6,9 @@ module FuelSurcharge
   module StringFormatter
     refine String do
       def to_multiplier
-        number = BigDecimal tr(",", ".").gsub(/[^0-9\.]/, "")
-
-        (number / 100 + 1).round(4)
+        clean_string = tr(",", ".").gsub(/[^0-9\.]/, "")
+        number = BigDecimal(clean_string)
+        1 + (number / 100).round(4)
       end
     end
   end