ScalaでつくるちょっとしたCLIツール

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4DBMBͰͭ͘Δ  ͪΐͬͱͨ͠$-*πʔϧ !UPEPLS ָ͘͠

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୭ͩ ాॴॣ༎!UPEPLS ٻਓݕࡧΤϯδϯ8FCΫϩʔϥɺ޿ࠂ഑৴γεςϜɺ  ޿ࠂϩάج൫ɺ0QFO*%$POOFDUೝূɺ3%#.4͓Ҿӽ͠

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4DBMB w +BWBͱͷ૬ޓӡ༻ੑ w γʔϜϨεͳݺͼग़͠ɺ+BWBඪ४ϥΠϒϥϦͷ࠶ར༻ w ؆ܿੑ w লུՄೳͳߏจɺܕਪ࿦ɺڧྗͳඪ४ϥΠϒϥϦ w ந৅౓ͷߴ͍ίʔυɺ৽੍͍͠ޚߏจΛఆٛͰ͖Δදݱྗ w 8IBUͷڧௐɺ)PXͷӅณ w ੩తܕ෇͚ w ݕূՄೳੑɺϦϑΝΫλͷ͠΍͢͞ɺυΩϡϝϯτੑ

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4DBMBΛձࣾͰ࢖͍͍͚ͨͲ  Ͳ͏ͨ͠Β͍͍ͩΖ͏ʁ ձࣾͷٕज़తํ਑ͱ͔ɺϝϯόʔͷख़࿅౓ͱ͔ɺϓϩμΫτॻ͖௚͠ͱ͔

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4DBMBΛձࣾͰ࢖͍͍͚ͨͲ  Ͳ͏ͨ͠Β͍͍ͩΖ͏ʁ ձࣾͷٕज़తํ਑ͱ͔ɺϝϯόʔͷख़࿅౓ͱ͔ɺϓϩμΫτॻ͖௚͠ͱ͔ ·ͣ࢖͍·͠ΐ͏ʂ  ͍͖ͳΓϓϩμΫτʹಋೖ͢Δͷ͸େมɻ  ͳͷͰɺ·ͣ͸ݸਓͰ׬݁͢Δۀ຿ʹ࢖ͬͯΈͯɺ ʮΑ͔ͬͨΑʂʯʮ໘ന͍Αʂʯͱ෍ڭ͍ͯ͘͠ͷ͕Α͍͔΋͠Ε·ͤΜɻ

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4DBMBͬͯɺͦͦ͜͜େ͖ͳ  ϓϩμΫτ޲͚ͳΜ͡Όͳ͍ͷʁ 5XJUUFSͱ͔"QBDIF4QBSLͱ͔ΞυςΫͱ͔

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4DBMBͬͯɺͦͦ͜͜େ͖ͳ  ϓϩμΫτ޲͚ͳΜ͡Όͳ͍ͷʁ 5XJUUFSͱ͔"QBDIF4QBSLͱ͔ΞυςΫͱ͔ ͪΐͬͱͨ͠εΫϦϓτΛ  ॻ͘ͷʹ΋͍͍ײ͡Ͱ͢ (*U)VCͷτϨϯυΛݟΔͱɺ͔֬ʹ෼ࢄγεςϜ΍Ϗοάσʔλɺ  ػցֶशܥͷϓϩμΫτ͕ଟ͍Ͱ͢ɻ ͕ɺͪΐͬͱͨ͠ίʔυΛॻ͍ͯαοͱಈ͔͢͜ͱ΋࣮͸ಘҙͳΜͰ͢ɻ

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r.BSUJO0EFSTLZ -FY4QPPO BOE#JMM7FOOFST 5IFOBNF4DBMBTUBOETGPSlTDBMBCMFMBOHVBHFz ʜ  :PVDBOBQQMZ4DBMBUP  BXJEFSBOHFPGQSPHSBNNJOHUBTLT   GSPNXSJUJOHTNBMMTDSJQUTUPCVJMEJOHMBSHFTZTUFNT

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4DBMB͸େֻ͔ΓͳϓϩμΫτΛ࡞Δͷʹద͍ͯ͠ΔݴޠͰ͕͢ɺ )BDLZͳ਺ߦd਺ेߦͷ  εΫϦϓςΟϯά΋े෼  շదʹͰ͖·͢

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4DBMB͸େֻ͔ΓͳϓϩμΫτΛ࡞Δͷʹద͍ͯ͠ΔݴޠͰ͕͢ɺ )BDLZͳ਺ߦd਺ेߦͷ  εΫϦϓςΟϯά΋े෼  շదʹͰ͖·͢

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#  %FNPOTUSBUJPO5JNF .BSLEPXOΛࣼΊಡΈ͢Δ

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TDBMBJP4PVSDF w ϩʔΧϧϦϞʔτͷϑΝΠϧಡΈॻ͖ʹศར w ςΩετϑΝΠϧΛߦ୯ҐDIBS୯ҐͰJUBSBUJWFʹ  ॲཧͰ͖ΔͷͰɺϑΝΠϧαΠζ͕େ͖ͯ͘΋҆৺ w HFU-JOFTͯ͠ίϨΫγϣϯϝιουͰΩϝΔͳͲ

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#  %FNPOTUSBUJPO5JNF εΫϨΠϐϯάΛ΍ͬͯΈΔ

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4USJOH*OUFSQPMBUJPO w จࣈྻϦςϥϧͷલʹTΛ෇͚Δͱɺม਺Λల։Ͱ͖Δ val price = 1000 s"Price is $price" // => Price is 1000

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5SJQMF2VPUF "Hello triple quote!\nHello stripMargin!" """Hello triple quote! Hello stripMargin!""" """|Hello triple quote! |Hello stripMargin!""".stripMargin w վߦΛؚΉจࣈྻΛຒΊࠐΉʹ͸ɺΛ࢖͏ w ΠϯσϯτΛଗ͑Δʹ͸Πϯσϯτจࣈ c ͱTUSJQ.BSHJOΛ࢖͏

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4USJOH*OUFSQPMBUJPOͱ5SJQMF2VPUF val response = s"""HTTP/1.1 ${status.value} |Date: ${rfc1123Formatter.format(now)} |Server: SimpleScalaHttpServer |Content-Type: $contentType |Content-Length: ${body.length.toString} |Connection: Close | |""".stripMargin ͪΐͬͱͨ͠ςϯϓϨʔτΤϯδϯΈ͍ͨʹ࢖͏͜ͱ΋

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$-*πʔϧʹͯ͠͸  ΋ͬ͞Γ͗͢͠͡Όͳ͍ʁ ύΠϓͱ͔ͰΨϯΨϯͭͳ͍ͰαΫαΫಈ͔͍ͨ͠ΜͰ͚͢Ͳɻ

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$-*πʔϧʹͯ͠͸  ΋ͬ͞Γ͗͢͠͡Όͳ͍ʁ ύΠϓͱ͔ͰΨϯΨϯͭͳ͍ͰαΫαΫಈ͔͍ͨ͠ΜͰ͚͢Ͳɻ ࣮ߦՄೳͳόΠφϦΛੜ੒͠  αΫαΫಈ͔͢͜ͱ΋Ͱ͖·͢ 4DBMB/BUJWF΍(SBBM7.ͷ4VCTUSBJU7.Λ࢖͍ɺ  (PͷΑ͏ʹ࣮ߦՄೳͳόΠφϦΛੜ੒͢Δ͜ͱ΋ՄೳͰ͢ɻ +7.ͷىಈΛ଴ͨͣʹαΫαΫಈ͔͢͜ͱ͕Ͱ͖·͢ʂ

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IUUQXXXTDBMBOBUJWFPSHFOW

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#  %FNPOTUSBUJPO5JNF .BSLEPXOࣼΊಡΈΛ4DBMB/BUJWFͰߴ଎Խ

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·ͱΊ w 4DBMBΛ࢓ࣄͰ࢖͓͏ʂ w ·ͣ͸ݸਓͷۀ຿Ͱ׬݁͢ΔൣғͰ΍ͬͯΈΑ͏ʂ w 4DBMB͸εέʔϥϒϧͳݴޠʂ w େ͖͍ϓϩμΫτ΋ɺখ͞ͳεΫϦϓτ΋͍͍ײ͡ʂ w εΫϦϓςΟϯάʹศརͳػೳΛ஌͓ͬͯ͜͏ʂ w TDBMBJP4PVSDF w 4USJOH*OUFSQPMBUJPO w 5SJQMF2VPUF w ࣮ߦՄೳͳόΠφϦΛੜ੒͢Δ͜ͱ΋Ͱ͖ΔΑʂ w αΫαΫಈ͍ͯɺͦͷ··νʔϜʹڞ༗΋Ͱ͖Δʂ w མͱ݀͠΋͋Δ͔ΒؾΛ͚ͭΑ͏ʂ

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5IBOLZPV Some(question) match { case Twitter => "@todokr" case GitHub => "@todokr" case Facebook => "shunsuke.tadokoro" case _ => invokeDynamic }