[WIP] Add bundle_report compatibility --ruby-version report

#115

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 * Your changes/patches go here.
 
+- [FEATURE: Support compatibility for Ruby versions](https://github.com/fastruby/next_rails/pull/116)
+
 # v1.3.0 / 2023-06-16 [(commits)](https://github.com/fastruby/next_rails/compare/v1.2.4...v1.3.0)
 
 - [FEATURE: Add NextRails.next? for application usage (e.g. Rails shims)](https://github.com/fastruby/next_rails/pull/97)

README.md

@@ -39,10 +39,15 @@ bundle_report outdated --json
 # Show gems that don't work with Rails 5.2.0
 bundle_report compatibility --rails-version=5.2.0
 
-# Show the usual help message
-bundle_report --help
+# Show gems that don't work with Ruby 3.0
+bundle_report compatibility --ruby-version=3.0
+
 # Find minimum compatible ruby version with Rails 7.0.0
 bundle_report ruby_check --rails-version=7.0.0
+
+# Show the usual help message
+bundle_report --help
+
 ```
 
 ### Application usage

lib/next_rails/bundle_report/ruby_version_compatibility.rb

@@ -0,0 +1,45 @@
+require "colorize"
+
+class NextRails::BundleReport::RubyVersionCompatibility
+  attr_reader :gems, :options
+
+  VALID_RUBY_VERSIONS = (1.9..3.4).step(0.1).to_a.freeze
+
+  def initialize(gems: NextRails::GemInfo.all, options: nil)
+    @gems = gems
+    @options = options
+  end
+
+  def generate
+    return invalid_message unless valid?
+
+    message
+  end
+
+  private
+
+  def message
+    output = "=> Incompatible gems with Ruby #{ruby_version}:\n".white.bold
+    incompatible.each do |gem|
+      output += "\n#{gem.name} - required Ruby version: #{gem.gem_specification.required_ruby_version}".magenta
+    end
+    output += "\n\n#{incompatible.length} gems incompatible with Ruby #{ruby_version}".red
+    output
+  end
+
+  def incompatible
+    gems.reject { |gem| gem.compatible_with_ruby?(ruby_version) }
+  end
+
+  def ruby_version
+    options[:ruby_version].to_f
+  end
+
+  def invalid_message
+    "=> Invalid Ruby version: #{ruby_version}. Valid versions are: #{VALID_RUBY_VERSIONS.join(', ')}".white.bold
+  end
+
+  def valid?
+    VALID_RUBY_VERSIONS.include?(ruby_version)
+  end
+end

lib/next_rails/gem_info.rb

@@ -147,5 +147,9 @@ def spec_compatible_with_rails?(specification: nil, rails_version: nil)
         rails_dependency.requirement.satisfied_by?(Gem::Version.new(rails_version))
       end
     end
+
+    def compatible_with_ruby?(ruby_version)
+      gem_specification.required_ruby_version.satisfied_by?(Gem::Version.new(ruby_version))
+    end
   end
 end

spec/next_rails/bundle_report/ruby_version_compatibility_spec.rb

@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+require "next_rails/bundle_report/ruby_version_compatibility"
+
+RSpec.describe NextRails::BundleReport::RubyVersionCompatibility do
+  let(:ruby_3_0_gem) do
+    Gem::Specification.new do |s|
+      s.name = "ruby_3_0_gem"
+      s.version = "1.0.0"
+      s.required_ruby_version = ">= 3.0"
+    end
+  end
+
+  let(:ruby_2_5_gem) do
+    Gem::Specification.new do |s|
+      s.name = "ruby_2_5_gem"
+      s.version = "1.0.0"
+      s.required_ruby_version = ">= 2.5"
+    end
+  end
+
+  let(:ruby_2_3_to_2_5_gem) do
+    Gem::Specification.new do |s|
+      s.name = "ruby_2_3_to_2_5_gem"
+      s.version = "1.0.0"
+      s.required_ruby_version = [">= 2.3", "< 2.5"]
+    end
+  end
+
+  let(:no_ruby_version_gem) do
+    Gem::Specification.new do |s|
+      s.name = "no_ruby_version_gem"
+      s.version = "1.0.0"
+    end
+  end
+
+  describe "#generate" do
+    let(:gems) do
+      [
+        NextRails::GemInfo.new(ruby_3_0_gem),
+        NextRails::GemInfo.new(ruby_2_5_gem),
+        NextRails::GemInfo.new(ruby_2_3_to_2_5_gem),
+        NextRails::GemInfo.new(no_ruby_version_gem)
+      ]
+    end
+
+    context "with invalid ruby version" do
+      it "returns invalid message" do
+        options = { ruby_version: "hola" }
+
+        result = described_class.new(gems: gems, options: options).generate
+        expect(result).to include "Invalid Ruby version"
+      end
+    end
+
+    context "with valid ruby version" do
+      it "returns 2 incompatible gems" do
+        options = { ruby_version: "2.7" }
+
+        result = described_class.new(gems: gems, options: options).generate
+
+        expect(result).to include "Incompatible gems with Ruby 2.7"
+        expect(result).to include "2 gems incompatible with Ruby 2.7"
+      end
+    end
+  end
+end