discourse/lib/plugin_initialization_guard.rb

# frozen_string_literal: true

def plugin_initialization_guard(&block)
  begin
    block.call
  rescue => error
    plugins_directory = Rails.root + 'plugins'

    if error.backtrace && error.backtrace_locations
      plugin_path = error.backtrace_locations.lazy.map do |location|
        Pathname.new(location.absolute_path)
          .ascend
          .lazy
          .find { |path| path.parent == plugins_directory }
      end.next

      raise unless plugin_path

      stack_trace = error.backtrace.each_with_index.inject([]) do |messages, (line, index)|
        if index == 0
          messages << "#{line}: #{error} (#{error.class})"
        else
          messages << "\t#{index}: from #{line}"
        end
      end.reverse.join("\n")

      STDERR.puts <<~TEXT
        #{stack_trace}

        ** INCOMPATIBLE PLUGIN **

        You are unable to build Discourse due to errors in the plugin at
        #{plugin_path}

        Please try removing this plugin and rebuilding again!
      TEXT
    else
      STDERR.puts <<~TEXT
        ** PLUGIN FAILURE **

        You are unable to build Discourse due to this error during plugin
        initialization:

        #{error}

        #{error.backtrace.join("\n")}
      TEXT
    end
    exit 1
  end
end