Tabelize output

README.md

@@ -14,13 +14,25 @@ requires Ruby 1.9.3, and `rails4_upgrade` uses 1.9-only syntax and semantics.
 
 Add to `Gemfile`:
 
-    gem 'rails4_upgrade', github: 'alindeman/rails4_upgrade'
+```ruby
+gem 'rails4_upgrade', github: 'alindeman/rails4_upgrade'
+```
 
 ## Usage
 
 List gems that would currently prevent you from upgrading to Rails 4:
 
-    rake rails4:check_gems
+```
+$ rake rails4:check_gems
++--------------------+----------------------+
+| Dependency Path    | Rails Requirement    |
++--------------------+----------------------+
+| draper 0.18.0      | actionpack ~> 3.2    |
+| draper 0.18.0      | activesupport ~> 3.2 |
+| simple_form 2.0.4  | actionpack ~> 3.0    |
+| simple_form 2.0.4  | activemodel ~> 3.0   |
++--------------------+----------------------+
+```
 
 ## Contributing
 

lib/rails4_upgrade/formatters/incompatible_gems_formatter.rb

@@ -1,3 +1,5 @@
+require "terminal-table"
+
 module Rails4Upgrade
   module Formatters
     class IncompatibleGemsFormatter
@@ -8,11 +10,20 @@ def initialize(incompatible_gems)
       def output(stream = STDOUT)
         incompatibilities = @incompatible_gems.incompatibilities
         if incompatibilities.empty?
-          stream.puts colorize(:success, "No gem incompatibilities found")
+          stream.puts "No gem incompatibilities found"
         else
+          rows = []
           incompatibilities.each do |incompatibility|
-            stream.puts colorize(:failure, "#{human_readable_dependency_path(incompatibility.path)} depends on #{incompatibility.dependency.name} #{incompatibility.dependency.requirement}")
+            rows << [
+              human_readable_dependency_path(incompatibility.path),
+              human_readable_dependency(incompatibility.dependency)
+            ]
           end
+
+          stream.puts Terminal::Table.new(
+            headings: ["Dependency Path", "Rails Requirement"],
+            rows:     rows
+          )
         end
       end
 
@@ -22,13 +33,8 @@ def human_readable_dependency_path(path)
         path.map { |dependency| "#{dependency.name} #{dependency.version}" }.join(" -> ")
       end
 
-      def colorize(tag, string)
-        case tag
-        when :failure
-          "\e[31m#{string}\e[0m"
-        when :success
-          "\e[35m#{string}\e[0m"
-        end
+      def human_readable_dependency(dependency)
+        "#{dependency.name} #{dependency.requirement}"
       end
     end
   end

rails4_upgrade.gemspec

@@ -18,6 +18,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
 
   gem.add_dependency "bundler", ">=1.2.2"
+  gem.add_dependency "terminal-table", ">=1.4.5"
 
   gem.add_development_dependency "rake",     "~>10.0.0"
   gem.add_development_dependency "rspec",    "~>2.12.0"