Add release notes and gem version diff generator

1 files changed, 37 insertions, 0 deletions

diff --git a/tasks/bin/gem-version-diff b/tasks/bin/gem-version-diff
new file mode 100755
index 0000000000..617402d4e6
--- /dev/null
+++ b/tasks/bin/gem-version-diff
@@ -0,0 +1,37 @@
+#!/usr/bin/env ruby
+
+require_relative "../../version_policy"
+
+old_version, new_version = ARGV[0..1]
+
+require "set"
+ENV["BUNDLE_WITHOUT"] = INSTALL_WITHOUT_GROUPS.join(":")
+relevant_gems = Set.new
+`bundle list`.each_line do |line|
+  next unless line =~ /^  \* (\S+)/
+  relevant_gems.add($1)
+end
+
+old_gems = {}
+old_file = `git show #{old_version}:Gemfile.lock`
+old_file.each_line do |line|
+  next unless line =~ /^    (\S+) \(([^\)]+)\)$/
+  next unless relevant_gems.include?($1)
+  old_gems[$1] = $2
+end
+
+new_gems = {}
+new_file = `git show #{new_version}:Gemfile.lock`
+new_file.each_line do |line|
+  next unless line =~ /^    (\S+) \(([^\)]+)\)$/
+  next unless relevant_gems.include?($1)
+  new_gems[$1] = $2
+end
+
+modified_gems = (old_gems.keys & new_gems.keys).sort.select { |name| new_gems[name] != old_gems[name] }.map { |name| "#{name} - #{new_gems[name]} (was #{old_gems[name]})" }
+removed_gems = (old_gems.keys - new_gems.keys).sort.map { |name| "#{name} - #{old_gems[name]}" }
+added_gems = (new_gems.keys - old_gems.keys).sort.map { |name| "#{name} - #{new_gems[name]}" }
+
+puts "MODIFIED:\n#{modified_gems.join("\n")}" if modified_gems.any?
+puts "\nADDED:\n#{added_gems.join("\n")}" if added_gems.any?
+puts "\nREMOVED:\n#{removed_gems.join("\n")}" if removed_gems.any?