Commits on Jun 10, 2022

1. Import rubocop-daemon …

   Preparing to resolve rubocop#9503.
   
   This PR imports https://github.com/fohte/rubocop-daemon into RuboCop core.
   
   The rubocop-daemon's original license (MIT) is written at the beginning
   of the imported files.

   

   koic committed Jun 10, 2022
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2. Integrate rubocop-daemon …

   The integrated daemon feature is described in the docs/modules/ROOT/pages/usage/server.adoc
   included in this PR.
   
   ## Daemon options
   
   ```console
   % bundle exec rubocop --help
   (snip)
   
   Server Options:
           --[no-]server                If the daemon process has not started yet, start the
                                        server process and execute inspection with server.
                                        Default is false.
                                        You can specify the daemon host and port with
                                        the $RUBOCOP_SERVER_HOST and the $RUBOCOP_SERVER_PORT
                                        environment variables.
           --restart-server             Restart server process.
           --start-server               Start server process.
           --stop-server                Stop server process.
           --server-status              Show server status.
   ```
   
   The daemon mode `--daemon` is disabled by default because it is not yet
   stable as an integrated feature.
   
   ## Design note
   
   `RuboCop::Daemon::CLI`'s daemon options are not integrated into
   `RuboCop::CLI` and `RuboCop::Options`.
   Because `RuboCop::CLI` and `RuboCop::Options` classes have many dependencies
   and require the rubocop client (`exe/rubocop`) to make unnecessary `require '...'`.
   
   It's important to be lightweight because the daemon mode runs fast,
   so this design decided to have command line daemon options
   own (lightweight) option parse logic.
   
   And this design only exe/rubocop and lib/rubocop/options.rb files have changed,
   So almost all daemon code keep independent.
   
   NOTE: This feature cannot be used on JRuby and Windows that do not support fork.

   

   koic committed Jun 10, 2022
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