gemify redmine plugins.

Gemfile.local

plugins = [
  ['redmine_audit'],
  # ['foo', '>= 1.0.0'],
  # ...
]

Gem.post_install do |installer|
  require 'rubygems/user_interaction'
  suffix = '.from_gemfile'
  gem_name = installer.spec.name

  # symlink plubins/<gemname> from bundle installed gem.
  plugin_names = plugins.map {|pl| pl.first }
  if plugin_names.include?(gem_name)
    # TODO: use Redmine::Plugin.directory and branch by Redmine version.
    path = File.join(Bundler.root, 'plugins', gem_name + suffix)
    if !File.exists?(path)
      ui = Gem::DefaultUserInteraction.ui
      ui.say 'Creating symlink to plugins directory.'
      File.symlink(installer.gem_dir, path)
    end
  end

  # delete unused symlinks.
  pattern = File.join(Bundler.root, 'plugins', "*#{suffix}")
  Dir.glob(pattern) do |path|
    orig_gem_name = File.basename(path).gsub(/#{Regexp.escape(suffix)}/, '')
    if !plugin_names.include?(orig_gem_name) && File.symlink?(path)
      File.unlink(path)
    end
  end
end

plugins.each do |args|
  gem *args
end