Make RuboCop Super Fast

by Koichi ITO

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.BLF3VCP$PQ 4VQFS'BTU ,PJDIJ*50&4. *OD 3VCZ,BJHJ RuboCop server mode 5IV

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&4. *OD

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🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊🌊 *TFFCJ4QPOTPS #esm_ise_ebi #rubykaigi

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Support OSS community

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3VCP$PQDPSFEFWFMPQFST +0900 UTC+0200 +0300 +0800 -0400 .PSFUIBODPOUSJCVUPST "VUIPS

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5IFpSTUDPNNJU % git log -p --reverse commit afbead34db54506c12a21dbd4ce04fada0f8b9a4 Author: Bozhidar Batsov Date: Sat Apr 21 13:06:42 2012 +0300 Initial commit to rubocop. --- .document | 5 +++++ .gitignore | 49 +++++++++++++++++++++++++++++++++++++++ ++++++++++ .rspec | 1 + Gemfile | 16 ++++++++++++++++ LICENSE.txt | 20 ++++++++++++++++++++ README.rdoc | 19 +++++++++++++++++++ Rakefile | 45 +++++++++++++++++++++++++++++++++++++++ ++++++ features/rubocop.feature | 9 +++++++++ features/step_definitions/rubocop_steps.rb | 0 features/support/env.rb | 13 +++++++++++++

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YGBTUFSNPEVMFMPBEJOH TFD SFRVJSFSVCPDPQ SFRVJSFSVCPDPQTFSWFS wrequire 'rubocop' SFRVJSFTNPTUPGpMFT wrequire 'rubocop/ server'POMZSFRVJSFT pMFTOFFEFEGPS TFSWFSNPEF

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#FGPSFSVCPDPQEBFNPO JOUFHSBUJPO 1BTUBOEDVSSFOU

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*OTJEFUSBEJUJPOBMrubocopDPNNBOE 3VCP$PQQSPDFTT 1*% # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run •RuboCop::CLI.new.runJTBOFOEQPJOU"1* w&BDICPPUrubocopQSPDFTTSVOTSVCPDPQDPNNBOE # Term #1 % rubocop 4UBSUBOESVO

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3VCP$PQQSPDFTT 1*% *OTJEFUSBEJUJPOBMrubocopDPNNBOE # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run •RuboCop::CLI.new.runJTBOFOEQPJOU"1* w&BDICPPUrubocopQSPDFTTSVOTSVCPDPQDPNNBOE # Term #1 % rubocop # Term #2 % rubocop 4UBSUBOESVO 3VCP$PQQSPDFTT 1*% # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run 4UBSUBOESVO

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3VCP$PQQSPDFTT 1*% *OTJEFUSBEJUJPOBMrubocopDPNNBOE # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run •RuboCop::CLI.new.runJTBOFOEQPJOU"1* w&BDICPPUrubocopQSPDFTTSVOTSVCPDPQDPNNBOE # Term #1 % rubocop # Term #2 % rubocop # Term #3 % rubocop 4UBSUBOESVO 4UBSUBOESVO 3VCP$PQQSPDFTT 1*% # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run 3VCP$PQQSPDFTT 1*% # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run 4UBSUBOESVO

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3VCP$PQQSPDFTT 1*% *OTJEFUSBEJUJPOBMrubocopDPNNBOE # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run •RuboCop::CLI.new.runJTBOFOEQPJOU"1* w&BDICPPUrubocopQSPDFTTSVOTSVCPDPQDPNNBOE # Term #1 % rubocop # Term #2 % rubocop # Term #3 % rubocop 4UBSUBOESVO 4UBSUBOESVO 3VCP$PQQSPDFTT 1*% # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run 3VCP$PQQSPDFTT 1*% # exe/rubocop (snip) require 'rubocop' RuboCop::CLI.new.run 1*%TBSFBMXBZTEJ⒎FSFOU 4UBSUBOESVO

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w/FFETrequire 'rubocop'UPVTFUIF"1* w*ODMVEFTFWFSZUIJOHZPVOFFEGPS 3VCP$PQ w.PTUPGpMFTJTSFRVJSFEBOE JUJTTMPX RuboCop::CLI.new.run"1*

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$MJFOU1SPDFTT 1*% 4UBSU%BFNPO 4FSWFS 4FSWFS1SPDFTT 1*% # Loading dependencies. require 'rubocop' TCPServer.open('127.0.0.1', port) Process.daemon(true) rubocop-daemon % rubocop-daemon start rubocop rubocop-daemon startTUBSUTTFSWFSQSPDFTT

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6QBOESVOOJOH $MJFOU1SPDFTT 1*% 4UBSU%BFNPO 4FSWFS 4FSWFS1SPDFTT 1*% # Loading dependencies. require 'rubocop' TCPServer.open('127.0.0.1', port) Process.daemon(true) rubocop-daemon % rubocop-daemon start rubocop rubocop-daemon startTUBSUTUIFQSPDFTTBTEBFNPO Process.daemon(true)

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6QBOESVOOJOH $MJFOU1SPDFTT 1*% &YFD3VCP$PQ 7JBDMJFOU 4FSWFS1SPDFTT 1*% # Loaded API RuboCop::CLI.new.run rubocop-daemon % rubocop-daemon exec rubocop rubocop-daemon execSVOTCLI.new.run PGEBFNPO TCP/IP TCPSocket.open('127.0.0.1', port)

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6QBOESVOOJOH $MJFOU1SPDFTT 1*% &YFD3VCP$PQ 7JBDMJFOU 4FSWFS1SPDFTT 1*% # Loaded API RuboCop::CLI.new.run rubocop-daemon % rubocop-daemon exec $MJFOU1SPDFTT 1*% % rubocop-daemon exec rubocop $POUJOVFUPDPOOFDUUPUIFBMSFBEZSVOOJOHEBFNPO TCP/IP TCP/IP

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SVCPDPQEBFNPOXSBQQFS 4FSWFS1SPDFTT QJE require 'rubocop' TCPServer.open('127.0.0.1', port) Process.daemon(true) rubocop-daemon-wrapper rubocop 5IFTIFMMTDSJQUTUBSUTUIFEBFNPOJGJUJTOPUSVOOJOH $MJFOU1SPDFTT QJE if [ ! -f "$TOKEN_PATH" ]; then $RUBOCOP_DAEMON start fi # snip if ! run_rubocop_command $@; then RuboCop::CLI.new.run # ~/.bashrc export PATH="/usr/local/bin/rubocop-daemon-wrapper:$PATH" ncDNE

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4FSWFS1SPDFTT QJE require 'rubocop' TCPServer.open('127.0.0.1', port) Process.daemon(true) SVCPDPQEBFNPOXSBQQFS rubocop-daemon-wrapper rubocop 5IFTIFMMTDSJQUTUBSUTUIFEBFNPOJGJUJTOPUSVOOJOH $MJFOU1SPDFTT QJE if [ ! -f "$TOKEN_PATH" ]; then $RUBOCOP_DAEMON start fi # snip if ! run_rubocop_command $@; then RuboCop::CLI.new.run # ~/.bashrc export PATH="/usr/local/bin/rubocop-daemon-wrapper:$PATH" ncDNE $RUBOCOP_DAEMON start require 'rubocop' TCPServer.open('127.0.0.1', port) Process.daemon(true)

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$MJFOU1SPDFTT 1*% "CPVUUIFTFSWFSNPEF client process % rubocop --server server process 4QFDJGZ--serverPQUJPOUPCPPUJOTFSWFSNPEF

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$MJFOU1SPDFTT 1*% "CPVUUIFTFSWFSNPEF 4FSWFS1SPDFTT 1*% require 'rubocop/server' server_cli = RuboCop::Server::CLI.new exit_status = server_cli.run exit exit_status if server_cli.exit? if RuboCop::Server.running? exit_status = RuboCop::Server::ClientCommand::Exec.new.run else require 'rubocop' cli = RuboCop::CLI.new.run end client process % rubocop --server server process 4UBSUTFSWFSQSPDFTTFTBOEJOTQFDUTPVSDFDPEF

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$MJFOU1SPDFTT 1*% "CPVUUIFTFSWFSNPEF 4FSWFS1SPDFTT 1*% require 'rubocop/server' server_cli = RuboCop::Server::CLI.new exit_status = server_cli.run exit exit_status if server_cli.exit? if RuboCop::Server.running? exit_status = RuboCop::Server::ClientCommand::Exec.new.run else require 'rubocop' cli = RuboCop::CLI.new.run end client process % rubocop --server $MJFOU1SPDFTT 1*% % rubocop --server server process $POUJOVFUPDPOOFDUUPBOBMSFBEZSVOOJOHTFSWFS "MXBZTUIFTBNFQSPDFTT

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wrequire 'rubocop'SFRVJSFT NPTUPGpMFT IFBWZXFJHIU wrequire 'rubocop/server'POMZ SFRVJSFTpMFTOFFEFEGPS TFSWFSNPEF MJHIUXFJHIU 3FEVDFSFRVJSFENPEVMFT

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YGBTUFSNPEVMFMPBEJOH TFD SFRVJSFSVCPDPQ SFRVJSFSVCPDPQTFSWFS wrequire 'rubocop' SFRVJSFTNPTUPGpMFT wrequire 'rubocop/ server'POMZSFRVJSFT pMFTOFFEFEGPS TFSWFSNPEF

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YGBTUFS % ruby -rbenchmark -e '$LOAD_PATH.unshift("/path/to/rubocop/lib"); Benchmark.bm { |x| x.report { require "rubocop" }}' user system total real 0.573636 0.217166 0.790802 ( 0.815585) % ruby -rbenchmark -e '$LOAD_PATH.unshift("/path/to/rubocop/lib"); Benchmark.bm { |x| x.report { require "rubocop/server" }}' user system total real 0.000386 0.000587 0.000973 ( 0.000969) SFRVJSFSVCPDPQ SFRVJSFSVCPDPQTFSWFS

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1BTUexe/rubocop $LOAD_PATH.unshift("#{__dir__}/../lib") require 'rubocop' RuboCop::CLI.new.run $PEFTOJQQFU &YFDVUFEFBDIUJNFXJUIUIFASVCPDPQADPNNBOE 3FRVJSFEFBDIUJNFXJUIUIFASVCPDPQADPNNBOE

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$VSSFOUexe/rubocop "GUFS require 'rubocop/server' server_cli = RuboCop::Server::CLI.new exit_status = server_cli.run exit exit_status if server_cli.exit? if RuboCop::Server.running? exit_status = RuboCop::Server::ClientCommand::Exec.new.run else require 'rubocop' cli = RuboCop::CLI.new.run end $PEFTOJQQFU .BLFBMJHIUXFJHIUEFQFOEFODZSFRVJSF require 'rubocop/server'

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.VDIMJHIUFSUIBOrequire 'rubocop' require 'rubocop/server' server_cli = RuboCop::Server::CLI.new exit_status = server_cli.run exit exit_status if server_cli.exit? if RuboCop::Server.running? exit_status = RuboCop::Server::ClientCommand::Exec.new.run else require 'rubocop' cli = RuboCop::CLI.new.run end $PEFTOJQQFU .BLFBMJHIUXFJHIUEFQFOEFODZSFRVJSF 4FSWFSNPEFTFUVQ FHTUBSUJOHBOETUPQQJOH $IFDLTFSWFSTUBUVT 3VOOJOHXJUITFSWFSNPEF server_cli = RuboCop::Server::CLI.new exit_status = server_cli.run exit exit_status if server_cli.exit? exit_status = RuboCop::Server::ClientCommand::Exec.new.run require 'rubocop/server' if RuboCop::Server.running?

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$MJFOU1SPDFTT 1*% &YFD3VCP$PQXJUITFSWFS 4FSWFS1SPDFTT 1*% require 'rubocop/server' server_cli = RuboCop::Server::CLI.new exit_status = server_cli.run exit exit_status if server_cli.exit? if RuboCop::Server.running? exit_status = RuboCop::Server::ClientCommand::Exec.new.run else require 'rubocop' cli = RuboCop::CLI.new.run end rubocop client % rubocop --server $MJFOU1SPDFTT 1*% % rubocop --server rubocop server $POUJOVFUPDPOOFDUUPBOBMSFBEZSVOOJOHTFSWFS "MXBZTUIFTBNFQSPDFTT

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w0CKFDUTMPBEFEXJUIrequire require_relativeFUD JUJTJO NFNPSZ w5IFTFSWFSQSPDFTTJTGBTUFSXIFO SFRVJSFENPEVMFTBSFMPBEFE 4QFFEVQXJUITFSWFS

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$PNNBOEMJOF"1*EFTJHO

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$PNNBOEMJOF"1*EFTJHO IUUQTHJUIVCDPNSVCPDPQSVCPDPQQVMMJTTVFDPNNFOU rubocop --serverWTrubocop-server

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w"OPUIFSPQUJPOJTrubocop-server DPNNBOEGPSTFSWFSNPEF w*UJTFBTZUPEFTJHOUIFTFSWFSQPSU OVNCFSBTBDPNNBOEMJOFBSHVNFOU w-JLFemacsclientDPNNBOE 8IZOPUrubocop-server

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*NQPSUFESVCPDPQEBFNPOPQUJPOT SVCPDPQEBFNPO SVCPDPQ OPUF FYFD rubocop-daemon exec rubocop --server rubocopJTBMTP0,BGUFS TUBSUJOHUIFTFSWFS FYFDXP TFSWFS N/A rubocop --no-server %FGBVMUXJUIPVUTFSWFS PQUJPOT TUBSUTFSWFS rubocop-daemon start rubocop --start-server )PTUBOEQPSUDBOCF TQFDJpFEXJUIFOWWBST TUPQTFSWFS rubocop-daemon stop rubocop --stop-server SFTUBSU rubocop-daemon restart rubocop --restart-server TUBUVT rubocop-daemon status rubocop --server-status TUBSUFYFD rubocop-daemon-wrapper rubocop --server

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4FSWFSNPEFPQUJPOT

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w5IFEFGBVMUCFIBWJPS w3VOXJUIPVUTFSWFS w*UTDPNQBUJCMFXJUIPME3VCP$PQ WFSTJPOT w*UTTUBCMFCVUTMPX --no-server EFGBVMU

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w3VOJOTQFDUJPOBGUFSTUBSUJOHSVCPDPQ TFSWFSQSPDFTTJGOPUTUBSUFE w"GUFSFYFDVUJOH--serverPQUJPO rubocopDPNNBOESVOTBTDMJFOU w*EMJLFUPDSFBUFBTIPSUOBNFCVU-sJT BMSFBEZVTFE --server

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w4FSWFSQSPDFTTOBNFJT rubocop --server #{dirname} w3VCP$PQTFSWFSTBSFBTTPDJBUFEXJUI UIFEJSFDUPSZJOXIJDIUIFZXFSFTUBSUFE 4FSWFSQSPDFTTOBNF % ps aux | grep 'rubocop --server' user 16060 0.0 0.0 5078568 2264 ?? S 7:54AM 0:00.00 rubocop --server /Users/koic/src/github.com/esminc/foo user 16337 0.0 0.0 5331560 2396 ?? S 23:51PM 0:00.00 rubocop --server /Users/koic/src/github.com/esminc/bar

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w4UBSU3VCP$PQTFSWFSQSPDFTT w6TFXIFOZPVXBOUUPTUBSUUIFTFSWFSPOMZ w5$1IPTUBOEQPSUDBOCFTQFDJpFEXJUIFOWJSPONFOU WBSJBCMFT w$RUBOCOP_SERVER_HOST w$RUBOCOP_SERVER_PORT wFH3VCP$PQ4FSWFSSVOTBT%PDLFSDPOUBJOFSBOE VTFSVTFTMJLFrubocop-daemon-wrapperPOIPTUNBDIJOF --start-server

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w4UPQ3VCP$PQTFSWFSQSPDFTT w6TFUIJTPQUJPOXIFOTFSWFS NPEFJTVOTUBCMF wFH6QEBUFHFN DPOpHVSBUJPO BOEFUD --stop-server

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w3FTUBSUTFSWFSQSPDFTT w4IPSUIBOEGPSTUPQBOETUBSU w:PVNBZVTFJUBGUFSbundle updateXIFO3VCP$PQTFSWFSJT VOTUBCMF --restart-server

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w:PVDBODPOpSNTFSWFS TUBUVT w4IPXOXJUI1*%XIFOSVOOJOH --server-status % rubocop --server-status RuboCop server (25960) is running. % rubocop --server-status RuboCop server is not running.

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w:PVDBOBMTPDPOpSNrubocop -V w+serverJTBEEFE w-VPQUJPOQSPWJEFTJOGPVTFEJOJTTVFSFQPSUT w-JLFruby -vGPSFOBCMF:+*5 +YJITJTBEEFE rubocop -V -BSHF7 % ruby --yjit -ve 'RubyVM::YJIT.enabled?' ruby 3.2.0dev (2022-09-08T05:31:42Z master 78af05ba0f) +YJIT [x86_64-darwin19] % rubocop -V 1.36.0 (using Parser 3.1.2.1, rubocop-ast 1.21.0, running on ruby 3.2.0) +server [x86_64-darwin19]

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" 3VOrubocopXJUIPVUTFSWFS QSPDFTTJGUIFQSPDFTTJTOPU SVOOJOH # 3VOrubocopXJUITFSWFSQSPDFTT JGUIFQSPDFTTJTSVOOJOH /PTFSWFSPQUJPOTHJWFO

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w*GZPVFODPVOUFSFE VOFYQFDUFECFIBWJPST 3VO rubocop--restart-server w"OEZPVDBOPQFOBOJTTVFUP UIFSVCPDPQSVCPDPQSFQP "UUFOUJPOT

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1BTUBOEDVSSFOU 8IBUTSVCPDPQEBFNPO *OUFHSBUFXJUISVCPDPQEBFNPO 5IFTFSWFSNPEF"1*EFTJHO 4FSWFSQSPDFTTBOEDBDIJOHpMFT "HFOEB

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4FSWFSQSPDFTTBOE DBDIJOHpMFT

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w3VCP$PQTFSWFSNPEF VTFT5$1*1QSPUPDPM w*ULFFQTUIFTFSWFST1*% FUDJOUIFDBDIFEJSFDUPSZ "CPVUUIFTFSWFSNPEFQSPUPDPM

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$MJFOU1SPDFTT 1*% TU4UBSUBOEFYFDUIFTFSWFS 4FSWFS1SPDFTT 1*% client % rubocop --server server 4UBSUBOFXTFSWFSQSPDFTTBOEHFUUIF1*% Socket

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DBDIFSVCPDPQ@DBDIFTFSWFS $MJFOU1SPDFTT 1*% TU4UBSUBOEFYFDUIFTFSWFS 4FSWFS1SPDFTT 1*% % rubocop --server 8SJUFQJE QPSU WFSTJPO BOEPUIFSTUPDBDIFpMFT QJE QPSU WFSTJPO Disk IO client server

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DBDIFSVCPDPQ@DBDIFTFSWFS $MJFOU1SPDFTT 1*% OE&YFDUIFTFSWFS 4FSWFS1SPDFTT 1*% % rubocop --server 3FBEQJE QPSU WFSTJPO BOEPUIFSTUPDBDIFpMFT QJE QPSU WFSTJPO $MJFOU1SPDFTT 1*% % rubocop (--server) Disk IO client server

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DBDIFSVCPDPQ@DBDIFTFSWFS $MJFOU1SPDFTT 1*% OE&YFDUIFTFSWFS 4FSWFS1SPDFTT 1*% % rubocop --server $POOFDUUPUIFTFSWFSQSPDFTTBOEJOTQFDUJPO QJE QPSU WFSTJPO $MJFOU1SPDFTT 1*% % rubocop (--server) Socket client server

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DBDIFSVCPDPQ@DBDIFTFSWFS $MJFOU1SPDFTT 1*% 5IFDBDIFEJSFDUPSZ 4FSWFS1SPDFTT 1*% % rubocop --server 5IFDBDIFJTQMBDFEJO~/.cacheEJSFDUPSZCZEFGBVMU QJE QPSU WFSTJPO $MJFOU1SPDFTT 1*% % rubocop (--server) client server

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DBDIFSVCPDPQ@DBDIFTFSWFS $MJFOU1SPDFTT 1*% 5IFDBDIFEJSFDUPSZ 4FSWFS1SPDFTT 1*% % rubocop --server 3FTUBSUUIFQSPDFTTXIFOBGUFSbundle update QJE QPSU WFSTJPO $MJFOU1SPDFTT 1*% % rubocop (--server) 5IFDMJFOUDPNNBOESFTUBSUTUIFTFSWFS QSPDFTTJGJUEFUFDUTJODPNQBUJCMFWFSTJPO client server

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w6OGPSUVOBUFMZJUTTUJMMBCJU FYQFSJNFOUBM wrubocop --restart-serverXJMM TUJMMCFOFDFTTBSZJOTPNF TJUVBUJPOT $BOTFSWFSNPEFCFUIFEFGBVMU

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w.BLFBVUPSFMPBEBXBSFPG VQHSBEJOHSEQBSUZHFNT w6/*9EPNBJOTPDLFUPQUJPOJGGBTUFS w1SPWJEFTPQUJPOTGPSTIPSUBMJBTFT w4VQQPSU+3VCZ 4FSWFSNPEFFOIBODFEQMBOT

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wrubocop --serverDBONBLF 3VCP$PQGBTUFS wrubocop --restart-serverNBZ TPMWFZPVSTFSWFSNPEFJTTVF 6TFGVMPQUJPOT

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-FBSOGSPNZFTUFSEBZ rubocop.org MJWFGPSUPEBZ IPQFGPSUPNPSSPX ʔAlbert Einstein