diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..888e1b6
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,5 @@
+AllCops:
+    NewCops: enable
+    TargetRubyVersion: 2.7
+    Exclude:
+        - "vendor/**/*"
diff --git a/bin/git-format-staged b/bin/git-format-staged
index d1ac2e7..6e20263 100755
--- a/bin/git-format-staged
+++ b/bin/git-format-staged
@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-require 'format-staged'
+require 'format_staged'
 require 'optparse'
 
 parameters = {
@@ -14,17 +14,31 @@ parser = OptionParser.new do |opt|
   opt.banner = "Usage: #{opt.program_name} [options] [patterns]"
   opt.separator ''
   opt.on('-f', '--formatter COMMAND',
-         'Shell command to format files, will run once per file. Occurrences of the placeholder `{}` will be replaced with a path to the file being formatted. (Example: "prettier --stdin-filepath \'{}\'")') do |o|
+         <<~DOC
+           Shell command to format files, will run once per file. Occurrences of the placeholder `{}` will \
+           be replaced with a path to the file being formatted. \
+           (Example: "prettier --stdin-filepath \'{}\'")
+         DOC
+  ) do |o|
     parameters[:formatter] = o
   end
 
   opt.on('--[no-]update-working-tree',
-         'By default formatting changes made to staged file content will also be applied to working tree files via a patch. This option disables that behavior, leaving working tree files untouched.') do |value|
+         <<~DOC
+           By default formatting changes made to staged file content will also be applied to working tree \
+           files via a patch. This option disables that behavior, leaving working tree files untouched.#{' '}
+         DOC
+        ) do |value|
     parameters[:update] = value
   end
 
   opt.on('--[no-]write',
-         "Prevents #{opt.program_name} from modifying staged or working tree files. You can use this option to check staged changes with a linter instead of formatting. With this option stdout from the formatter command is ignored.") do |value|
+         <<~DOC
+           "Prevents #{opt.program_name} from modifying staged or working tree files. You can use this option \
+           to check staged changes with a linter instead of formatting. With this option stdout from the \
+           formatter command is ignored."
+         DOC
+        ) do |value|
     parameters[:write] = value
   end
 
diff --git a/format-staged.gemspec b/format-staged.gemspec
index ecdc19d..ff70c99 100644
--- a/format-staged.gemspec
+++ b/format-staged.gemspec
@@ -18,4 +18,8 @@ Gem::Specification.new do |s|
   s.required_ruby_version = '2.7'
 
   s.add_development_dependency 'rubocop', '~> 1.29'
+
+  s.metadata = {
+    'rubygems_mfa_required' => 'true'
+  }
 end
diff --git a/lib/format-staged/entry.rb b/lib/format-staged/entry.rb
index 82c171f..3684b7d 100644
--- a/lib/format-staged/entry.rb
+++ b/lib/format-staged/entry.rb
@@ -2,7 +2,15 @@
 
 class FormatStaged
   class Entry
-    PATTERN = /^:(?<src_mode>\d+) (?<dst_mode>\d+) (?<src_hash>[a-f0-9]+) (?<dst_hash>[a-f0-9]+) (?<status>[A-Z])(?<score>\d+)?\t(?<src_path>[^\t]+)(?:\t(?<dst_path>[^\t]+))?$/.freeze
+    PATTERN = /^
+      :(?<src_mode>\d+)\s
+      (?<dst_mode>\d+)\s
+      (?<src_hash>[a-f0-9]+)\s
+      (?<dst_hash>[a-f0-9]+)\s
+      (?<status>[A-Z])(?<score>\d+)?\t
+      (?<src_path>[^\t]+)
+      (?:\t(?<dst_path>[^\t]+))?
+      $/x.freeze
 
     attr_reader :src_mode, :dst_mode, :src_hash, :dst_hash, :status, :score, :src_path, :dst_path, :path, :root
 
diff --git a/lib/format-staged.rb b/lib/format_staged.rb
similarity index 100%
rename from lib/format-staged.rb
rename to lib/format_staged.rb