RuboCop Philosophy - Speaker Deck

RuboCop Philosophy

by Koichi ITO

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3VCP$PQϝϯςφʔ͙͠͞ RuboCop Philosophy ϓϩάϥϛϯάݴޠ3VCZप೥ه೦Πϕϯτ 4BU ҏ౻ߒҰ&4. *OD

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େࣄͳ͜ͱ ͸࠷ॳʹ

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ॕप೥🎉

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@koic w044ϓϩάϥϚʔ w3VCP$PQίΞνʔϜ wגࣜձࣾӬ࿨γεςϜϚωδϝϯτ &4. *OD ΤϯδχΞϦϯάϚωʔδϟʔ݉ σΟεςΟϯάΠογϡυΤϯδχΞ

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044ίϛϡχςΟͱͷڞੜΛࢧԉ 3BJMT044ύονձ #esm_oss

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w +BWB4DSJQU1SFUUJFS &4-JOU w (P(PGNU w 3VTU3VTUGNU $MJQQZ w 3VCZ3VCP$PQ 4UBOEBSE BOE PUIFST ϦϯλʔϑΥʔϚολʔͷੈք

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IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTEPZPVMPWF

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IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTGSVTUSBUFZPVUIFNPTU

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ࠓ೔ͷ࿩

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3VCP$PQDPSFEFWFMPQFST +0900 UTC+0200 +0300 +0800 -0400 ։ൃऀʹΑͬͯߟ͑΍޷Έͷҧ͍͕͋Δ ͳͷͰ͜ͷൃද͸ࢲݸਓͷݟղͰ͢

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໨࣍ ஀ੜͱ఩ֶ ϐϥϛουͱࣗಈԽ ϝϯςφʔ͙͠͞

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஀ੜͱ఩ֶ

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w 3VCZ೥݄೔ੜ·Ε w IUUQTCMBEFSVCZMBOHPSHSVCZMJTU w 3BJMT೥݄೔ʹΞφ΢ϯε w IUUQTCMBEFSVCZMBOHPSHSVCZUBML w 3VCP$PQ೥݄೔ʹTUίϛοτ w IUUQTHJUIVCDPNSVCPDPQSVCPDPQDPNNJUBGCFBE 3VCZ 3BJMT 3VCP$PQͷ஀ੜ

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w 3VCZ͸प೥ w ॊೈͳදݱྗΛඋ͑ͯɺϓϩάϥϛϯάΛ ָ͘͢͠Δ 3VCZJTUʹ޾ͤΛ͸͜Ϳ ݴޠ w 3VCP$PQ͸ࡢ೥प೥ w 3VCZͱ͓Αͦࡀࠩ 3VCZͱ3VCP$PQ

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೥Λ౿·͑ͨެࣜ఩ֶ IUUQTEPDTSVCPDPQPSHSVCPDPQJOEFYIUNMQIJMPTPQIZ

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w 3VCP$PQ͸3VCZ4UZMF(VJEFͷϥϯλΠϜ࣮૷ w ॳظʹ໨ࢦͨ͠ͷ͸HPGNUతͳେ౷ҰϑΥϚολʔ w 3VCZίϛϡχςΟʹ͸ڝ߹͢ΔελΠϧ΍޷Έ͕͋Δ͜ ͱʹؾͮ͘ FHμϒϧΫΥʔτɺγϯάϧΫΥʔτ w ҰൠతͳελΠϧΛߏ੒Մೳʹ͢ΔΑ͏ʹͳΔ w ελΠϧΨΠυΛσϑΥϧτͱͭͭ͠ɺ޷Έͷҧ͍Λड ͚ೖΕΔͱ͍͏఩ֶʹجͮ͘Α͏ʹͳΔ 3VCP$PQͷ఩ֶαϚϦʔ

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޷Έͷҧ͍Λड͚ ೖΕΔͱ͍͏఩ֶ

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ϐϥϛουͱࣗಈԽ

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3VCZίϛϡχςΟͱ ίʔσΟϯάελΠϧ

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ੜ஀೥ͷϢʔβʔ ϕςϥϯ͔Β ϏΪφʔ·Ͱ෯޿͍૚

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ࢲ ͨͪ ͷߟ͑ͨ ࠷ڧ͋Δ͍͸࠷Ѫͷ ελΠϧଟ਺

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ڷʹೖΕ͹ ڷʹै͑ ίʔσΟϯάελΠϧʹ΋ݴ͑Δ͜ͱ

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ಛʹ࢓ࣄͰ͸େਓ ʹͳΔඞཁ͕͋Δ

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ϓϩδΣΫτ ࢓ࣄ ελΠϧϐϥϛου ݖҖͷελΠϧΨΠυ ࣗ෼ͷελΠϧ ϓϩδΣΫτͷελΠϧ͕͓͔͔ͬͨ͠ΒԼࠀ্͕ى͖͏Δ ͋͑ͯϧʔϧΛઃ͚ͳ͍PSߟྀ͞Εͣ Ѫ৘ ܟҙ कഁ ཭PSແ ϑϦʔμϜ δϟεςΟε ϓϩδΣΫτϧʔϧ༏ઌͰ ϧʔϧ͕ͳ͚Ε͹ ϑΥʔϧόοΫ͞Ε͍ͯ͘ $IBPT -BX

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͞Γ͸͞Γͱͯ1SPCMFNWT64 IUUQTUXJUUFSDPNPOLTUBUVT

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IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTEPZPVMPWF

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IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTGSVTUSBUFZPVUIFNPTU

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σϑΥϧτ͕࢖͍ ͮΒ͍͕ߏ੒͢Δ ͷ͸໘౗ͱ͍͏੠

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w σϑΥϧτ͕ݫ͗͢͠Δ w ݫ͍͠కΊ෇͚͕ྑ͍ͱ͍͏੠΋͋Δ w σϑΥϧτͰબ୒͞ΕͨελΠϧ͕͋Θͳ͍ w ରۃ͕࣠͋Δ΋ͷ͸೉͍͠ɻྫ͑͹γϯάϧΫΥʔτ೿ͱμϒϧ ΫΥʔτ೿ͷ߅૪͸ऴΘΒͳ͍ɻ3VCZ͕޷͖ͳͷ͸Θ͔ͬͨɻ w σϑΥϧτͰ༗ޮͷϧʔϧ͕ଟ͗͢Δ w ͜Ε͸ͦ͏ɻؤுͬͯݮΒ͢׆ಈΛ͍ͯ͠Δ͕ɺ͍ͨ΁Μɻ σϑΥϧτ΁ͷݱ࣮ͷ੠

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͍ͪͲσϑΥϧτʹ ͳͬͨ΋ͷ͸खڧ͍

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ϝϯςφʔ͙͠͞

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."/"48"/ ΁ͷෛ୲ΛݮΒ͢ ඞཁҎ্ͷΧελϚΠζઃఆ

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w ཧ૝ͱ͢ΔσϑΥϧτ͸5IF3BJMT%PDUSJOF ͷʮ5IFNFOVJTPNBLBTFʯͷੈք؍ w ͍͍ͩͨͷ৔߹͸σϑΥϧτͰ͏·͍͘͘ w ͨ·ʹ ͋Θͳ͍෦෼͸ΧελϚΠζͰ͖Δ શͯԕ͖ཧ૝ڷ

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Ͳ͏͍͏ߟ͑ํʹ ࢲ͸ج͍ͮͯΔʁ

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w ίϯτϦϏϡʔλ΁ͷ Ϛʔδ΁ͷ ຬ଍ײ Ͱ͸ͳ͘ɺϓϩμΫτ΁ͷϢʔβʔͷ࢖͍উ खΛॏࢹ͢Δ w ͨͱ͑͹ಛఆͷϓϩδΣΫτͷ޷Έ͕σϑΥ ϧτ޲͖ͱ͸ݶΒͳ͍ $PQDPQͱ͍͏ϝλ׆ಈ🚨 Ϋϩʔζ͸৺ॏ͍Ͱ͕͢Ϣʔβʔͷ൵໐Λ๷͙ͷΛ༏ઌ

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఩ਓدΓʁࢻਓدΓʁ ఩ਓ ࢻਓ w νʔϜ։ൃ w ݎ͍ن໿ w ౷Ұੑͷ९क w ݸਓ։ൃ w ؇͍ن໿ w ଟ༷ͷड͚ೖΕ ౓߹͍

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ࢲࣗ਎ͷࣗݾ෼ੳ ఩ਓ ࢻਓ w νʔϜ։ൃ w ݎ͍ن໿ w ౷Ұੑͷ९क w ݸਓ։ൃ w ؇͍ن໿ w ଟ༷ͷड͚ೖΕ ౓߹͍

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ࢲͷ఩ֶ ఩ਓ ࢻਓ w ΋ͬͱࣗ༝౓͕͋Δͱࣗવຯ ָ͠͞ ͋Δ w σϑΥϧτϧʔϧ͸΋ͬͱ؇ͯ͘ྑ͍ w ʮݫ͗͢͠ͳʯϧʔϧͷఏҊ͸͓فΓ͢Δ ౓߹͍

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w ϧʔϧͱͯ͠ݫ͗͢͠Δ w ಠࣗϧʔϧײ͕ڧ͍ w ِཅੑ͕ଟ͍͜ͱ͕ࣗ໌ͳ΋ͷ w ϚʔδޙʹϢʔβʔͷ൵໐͕େ͖ͦ͏ͳ΋ͷ ίΞʹड͚ೖΕʹ͍͘ϧʔϧ ίΞͰ͸ͳ͘SEύʔςΟʔͰͷެ։Λ঑Ί͍ͯΔ

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େ౷ҰͰ͖Δ͔໰୊ ఩ਓ ࢻਓ w ελΠϧͰ޷Έ͕෼͔ΕΔ w ఩ਓࢻਓͷ౓߹͍͕։ൃऀ͝ͱʹҟͳΔ w ͳΜͳΒ3VCZίϛολʔͰ΋ҟͳ͍ͬͯͨ ౓߹͍

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3VCP$PQDPSFEFWFMPQFST +0900 UTC+0200 +0300 +0800 -0400 ։ൃऀʹΑΔߟ͑΍޷Έͷҧ͍Λௐఀ͢Δ 3VCZJTUͷ਺͚ͩελΠϧͷ޷Έ͕ੜ·ΕΔ

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" ࠷ߴͷ$PQΛٻΊͯ

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w ϓϩάϥϚʔͷϝϞϦ؅ཧ͔ॲཧܥͷ($ͷ ୒Ͱͳ͘ɺίϯύΠϥͰϝϞϦ؅ཧΛղܾ ͢Δ3VTUͷಓ w ੩తܕ෇͚ͷܕԸܙ͔ಈతܕ෇͚ͷखܰ͞ͷ ୒Ͱͳ͘ɺܕఆٛϑΝΠϧͰ྆औΓΛ໨ࢦ ͢3#4ͷಓ ୈࡾͷղܾ

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w HPGNUͷΑ͏ͳ୒ҰϑΥʔϚοτͱϢʔβʔ ΧελϜͷߏ੒ͷ୒Ͱ͸ͳ͘ɺͳΜͱͳ͘ ೲಘײͷ͋Δʮ͍͍ͩͨ͏·͍͘͘ߏ੒ʯ w 3VCP$PQͰݕ౼͞ΕͯΔϓϦηοτ͕ͦΕ ʹ͍͕ۙʮ୭͔ͷዞҙੑʯ͔Βൈ͚ग़ͤͳ͍ 3VCP$PQͰ΋ୈࡾͷղܾ

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Ѫ৘͋Δዞҙੑ͕ ղܾ΁ͷಓʁ

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w ίϛϡχςΟͷҙࢥܾఆͱผʹ༏͍͠ಠࡋऀͷΑ ͏ͳݸਓʹΑΔҙࢥܾఆϞσϧ w ੨໦ๆ࿠͞Μͷʮ3VCZͷίʔσΟϯάελΠϧʯ w લాमޗ͞Μͷʮ3VCZίʔσΟϯάن໿ʯ w ۩ମతͳʮಛఆͷ୭͔ʯॏཁͰ͸ʁ FH0OL$PQ ଥ౰ͦ͏ͳʮ୭͔ʯϧʔϧʁ

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w ͍͍ͩͨ͏·͍͖ͦ͘͏ʁ .BU[$PQ

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w ·ͭ΋ͱ͞Μ؂म w 3VCZͷ਌ͱ͍͏͜ͱ͸Ѫ৘͸ੈքҰ w DisabledByDefault: trueϕʔεͷ֦ுHFN w ϧʔϧ $PQ ͸ແݶʹ૿͍͍͑ͯͬͯΔͷͰɺ ϛχϚϜͷελʔλʔΩοτΑ͏ͳ΋ͷʹͳΓ ͦ͏ .BU[$PQͷ͝ఏҊ

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w େਓʹͳͬͨ3VCZΛݟकΔ.BU[$PQͷΑ͏ͳݖ ҖͷσϑΥϧτ͕͋Δͱ޾ͤͳ3VCZJTU͸͍ͦ͏ w ͱ͸͍͑ϧʔϧͷऔࣺબ୒͕͍ͨ΁Μͦ͏ w 3VCP$PQϓϩμΫτͱͯ͠͸αϙʔτελΠϧ ͷͻͱͭͱݟ၏͠3VCP$PQͷ఩ֶΛຬ଍ͤ͞Β ΕΔ प೥ͷઌʹ޲͚ۭͨ૝