Drop Ruby 2.x support

Author: elct9620

.github/workflows/main.yml

@@ -7,7 +7,7 @@ on:
   pull_request:
 
 env:
-  RUBY_VERSION: '2.7.6'
+  RUBY_VERSION: '3.3'
 
 jobs:
   rubocop:
@@ -27,10 +27,10 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 2.6
-          - 2.7
           - 3.0
           - 3.1
+          - 3.2
+          - 3.3
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby

.rubocop.yml

@@ -10,7 +10,8 @@
 # See https://docs.rubocop.org/rubocop/configuration
 
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 3.0
+  SuggestExtensions: false
   NewCops: enable
 
 Metrics/BlockLength:

boxing.gemspec

@@ -11,7 +11,7 @@ Gem::Specification.new do |spec|
   spec.summary = 'The zero-configuration Dockerfile generator for Ruby'
   spec.description = 'The zero-configuration Dockerfile generator for Ruby'
   spec.homepage = 'https://github.com/elct9620/boxing'
-  spec.required_ruby_version = '>= 2.5.0'
+  spec.required_ruby_version = '>= 3.0.0'
 
   spec.metadata['homepage_uri'] = spec.homepage
   spec.metadata['source_code_uri'] = 'https://github.com/elct9620/boxing'

lib/boxing/generator.rb

@@ -11,12 +11,12 @@ class Generator
     ASCII_BOLD = "\e[1m"
     ASCII_RED = "\e[31m"
 
-    CREATED_MESSAGE = "#{ASCII_BOLD}create#{ASCII_CLEAR}\t%s"
-    IDENTICAL_MESSAGE = "#{ASCII_BOLD}identical#{ASCII_CLEAR}\t%s"
-    CONFLICT_MESSAGE = "#{ASCII_BOLD}#{ASCII_RED}conflict#{ASCII_CLEAR}\t%s"
+    CREATED_MESSAGE = "#{ASCII_BOLD}create#{ASCII_CLEAR}\t%s".freeze
+    IDENTICAL_MESSAGE = "#{ASCII_BOLD}identical#{ASCII_CLEAR}\t%s".freeze
+    CONFLICT_MESSAGE = "#{ASCII_BOLD}#{ASCII_RED}conflict#{ASCII_CLEAR}\t%s".freeze
     OVERWRITE_MESSAGE = 'Overwrite %s? (enter "h" for help) [Ynqdhm] '
-    FORCE_MESSAGE = "#{ASCII_BOLD}force#{ASCII_CLEAR}\t%s"
-    SKIP_MESSAGE = "#{ASCII_BOLD}skip#{ASCII_CLEAR}\t%s"
+    FORCE_MESSAGE = "#{ASCII_BOLD}force#{ASCII_CLEAR}\t%s".freeze
+    SKIP_MESSAGE = "#{ASCII_BOLD}skip#{ASCII_CLEAR}\t%s".freeze
     MERGE_TOOL_NOT_FOUND = 'Please configure merge.tool in your Git config.'
 
     attr_reader :destination, :path

lib/boxing/package.rb

@@ -14,7 +14,7 @@ class << self
       #
       # @since 0.1.0
       def load(path)
-        data = YAML.safe_load(File.read(path))
+        data = YAML.safe_load_file(path)
         mode = 0b00
         mode |= Package::RUNTIME if data['runtime']
         mode |= Package::BUILD if data['build']