add extra dependencies for prawn HEAD to Gemfile when testing upstream

1 files changed, 9 insertions, 0 deletions

diff --git a/scripts/switch-to-prawn-head.rb b/scripts/switch-to-prawn-head.rb
index 438e1021..92a0f28a 100644
--- a/scripts/switch-to-prawn-head.rb
+++ b/scripts/switch-to-prawn-head.rb
@@ -2,6 +2,8 @@ require 'fileutils'
 
 # NOTE it's necessary to hot patch the installed gem so that RubyGems can find it without Bundler
 prawn_spec = Gem::Specification.find_by_name 'prawn'
+old_requirements = prawn_spec.runtime_dependencies.map {|it| [it.name, it.requirements_list[0]] }.to_h
+new_requirements = nil
 FileUtils.rm_r prawn_spec.gem_dir, secure: true if Dir.exist? prawn_spec.gem_dir
 Process.wait Process.spawn %(git clone --depth=1 https://github.com/prawnpdf/prawn #{File.basename prawn_spec.gem_dir}), chdir: prawn_spec.gems_dir
 
@@ -20,8 +22,15 @@ prawn_spec_replacement = nil
 Dir.chdir prawn_spec.gem_dir do
   new_prawn_spec_contents = File.readlines 'prawn.gemspec', mode: 'r:UTF-8'
   new_prawn_spec = eval new_prawn_spec_contents.join, nil, (File.join prawn_spec.gem_dir, 'prawn.gemspec')
+  new_requirements = new_prawn_spec
+    .runtime_dependencies
+    .map {|it| [it.name, it.requirements_list[0]] }.to_h
+    .delete_if {|name| old_requirements.key? name }
   new_prawn_spec.version = prawn_spec.version
   prawn_spec_replacement = new_prawn_spec.to_ruby
 end
 
 File.write prawn_spec.spec_file, prawn_spec_replacement
+new_requirements.each do |name, requirement|
+  File.write 'Gemfile', %(gem '#{name}', '#{requirement}', require: false), mode: 'a'
+end unless new_requirements.empty?