jgrau · August 15, 2016 14:28 · Aug 15, 2016
diff --git a/update-all-gems b/update-all-gems
@@ -0,0 +1,113 @@
+#!/usr/bin/env ruby
+
+# Makes accessing the latest exitstatus a bit easier
+require 'English'
+
+# Updates all the outdated gems one by one and commits the changes
+# for every gem update. This should make it a lot easier to revert
+# a gem update.
+class UpdateAllGems
+  def self.run
+    new.update_all
+  end
+
+  TEST_CMD = ENV['TEST_CMD'] || 'make build'.freeze
+
+  attr_reader :outdated_gems
+
+  def initialize
+    @outdated_gems = fetch_outdated_gems
+  end
+
+  def update_all
+    outdated_gems.each do |gem_name|
+      update_gem(gem_name)
+      run_tests(gem_name)
+      commit_results(gem_name)
+    end
+  end
+
+  private
+
+  def fetch_outdated_gems
+    puts 'Fetching outdated gems with `bundle outdated`'
+    bundler_result = `bundle outdated`
+
+    exit 0 if last_command_success_finished_successfully?
+
+    if last_command_exitstatus != 1
+      raise "bundler exited with unexpected results: #{bundler_result}"
+    end
+
+    puts 'Outdated gems:'
+    puts bundler_result
+
+    extract_gem_names(bundler_result)
+  end
+
+  # Example `bundle outdated` output
+  # ```
+  # Outdated gems included in the bundle:
+  #   * active_scheduler (newest 0.3.0, installed 0.0.3) in group "default"
+  #   * minitest-reporters (newest 1.1.11, installed 1.1.4) in group "test"
+  #   * rails-erd (newest 1.5.0, installed 1.4.4) in group "development"
+  #   * hashdiff (newest 0.3.0, installed 0.2.3)
+  #   * ice_nine (newest 0.11.2, installed 0.11.1)
+  # ```
+  def extract_gem_names(text)
+    text.each_line.map do |line|
+      line.strip!
+
+      # Make sure we only grab lines that are actual outdated gems
+      # See the example output below
+      next unless line.start_with?('* ')
+
+      # Make sure we only outdate gems that are in our Gemfile
+      # See the example output below
+      next unless line.include?('in group')
+
+      line.split(' ')[1]
+    end.compact
+  end
+
+  def update_gem(gem_name)
+    puts "Updating #{gem_name} with `bundle update #{gem_name}`"
+    bundler_result = `bundle update #{gem_name}`
+
+    unless last_command_success_finished_successfully?
+      raise "Failed to update gem #{gem_name}: #{bundler_result}"
+    end
+
+    true
+  end
+
+  def run_tests(gem_name)
+    puts 'Running tests with `#{TEST_CMD}`'
+    test_result = `#{TEST_CMD}`
+
+    unless last_command_success_finished_successfully?
+      raise "Tests fail after updating #{gem_name}: #{test_result}"
+    end
+
+    true
+  end
+
+  def commit_results(gem_name)
+    puts "Committing updated #{gem_name}"
+    git_result = `git commit -am "Updated #{gem_name}"`
+
+    unless last_command_success_finished_successfully?
+      raise "Failed to commit results to git: #{git_result}"
+    end
+  end
+
+  def last_command_exitstatus
+    $CHILD_STATUS.exitstatus
+  end
+
+  def last_command_success_finished_successfully?
+    last_command_exitstatus.zero?
+  end
+end
+
+UpdateAllGems.run
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