Scalaでつくる ちょっとしたCLIツール

Sample code repository: https://github.com/todokr/scala-cli-samples

Transcript

1. 4DBMBͰͭ͘Δ

   ͪΐͬͱͨ͠$-*πʔϧ
   !UPEPLS
   ָ͘͠
   

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2. ୭ͩ
   ాॴॣ༎!UPEPLS
   ٻਓݕࡧΤϯδϯ8FCΫϩʔϥɺ޿ࠂ഑৴γεςϜɺ

   ޿ࠂϩάج൫ɺ0QFO*%$POOFDUೝূɺ3%#.4͓Ҿӽ͠
   

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4. 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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5. 
   4DBMBΛձࣾͰ࢖͍͍͚ͨͲ

   Ͳ͏ͨ͠Β͍͍ͩΖ͏ʁ
   ձࣾͷٕज़తํ਑ͱ͔ɺϝϯόʔͷख़࿅౓ͱ͔ɺϓϩμΫτॻ͖௚͠ͱ͔
   

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6. 
   4DBMBΛձࣾͰ࢖͍͍͚ͨͲ

   Ͳ͏ͨ͠Β͍͍ͩΖ͏ʁ
   ձࣾͷٕज़తํ਑ͱ͔ɺϝϯόʔͷख़࿅౓ͱ͔ɺϓϩμΫτॻ͖௚͠ͱ͔
   
   ·ͣ࢖͍·͠ΐ͏ʂ

   ͍͖ͳΓϓϩμΫτʹಋೖ͢Δͷ͸େมɻ

   ͳͷͰɺ·ͣ͸ݸਓͰ׬݁͢Δۀ຿ʹ࢖ͬͯΈͯɺ
   ʮΑ͔ͬͨΑʂʯʮ໘ന͍Αʂʯͱ෍ڭ͍ͯ͘͠ͷ͕Α͍͔΋͠Ε·ͤΜɻ
   

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7. 
   4DBMBͬͯɺͦͦ͜͜େ͖ͳ

   ϓϩμΫτ޲͚ͳΜ͡Όͳ͍ͷʁ
   5XJUUFSͱ͔"QBDIF4QBSLͱ͔ΞυςΫͱ͔
   

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8. 
   4DBMBͬͯɺͦͦ͜͜େ͖ͳ

   ϓϩμΫτ޲͚ͳΜ͡Όͳ͍ͷʁ
   5XJUUFSͱ͔"QBDIF4QBSLͱ͔ΞυςΫͱ͔
   
   ͪΐͬͱͨ͠εΫϦϓτΛ

   ॻ͘ͷʹ΋͍͍ײ͡Ͱ͢
   (*U)VCͷτϨϯυΛݟΔͱɺ͔֬ʹ෼ࢄγεςϜ΍Ϗοάσʔλɺ

   ػցֶशܥͷϓϩμΫτ͕ଟ͍Ͱ͢ɻ
   ͕ɺͪΐͬͱͨ͠ίʔυΛॻ͍ͯαοͱಈ͔͢͜ͱ΋࣮͸ಘҙͳΜͰ͢ɻ
   

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9. r.BSUJO0EFSTLZ -FY4QPPO BOE#JMM7FOOFST
   5IFOBNF4DBMBTUBOETGPSlTDBMBCMFMBOHVBHFz
   ʜ

   :PVDBOBQQMZ4DBMBUP

   BXJEFSBOHFPGQSPHSBNNJOHUBTLT 

   GSPNXSJUJOHTNBMMTDSJQUTUPCVJMEJOHMBSHFTZTUFNT
   

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10. 
    4DBMB͸େֻ͔ΓͳϓϩμΫτΛ࡞Δͷʹద͍ͯ͠ΔݴޠͰ͕͢ɺ
    )BDLZͳ਺ߦd਺ेߦͷ

    εΫϦϓςΟϯά΋े෼

    շదʹͰ͖·͢
    

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11. 
    4DBMB͸େֻ͔ΓͳϓϩμΫτΛ࡞Δͷʹద͍ͯ͠ΔݴޠͰ͕͢ɺ
    )BDLZͳ਺ߦd਺ेߦͷ

    εΫϦϓςΟϯά΋े෼

    շదʹͰ͖·͢
    

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12. #

    %FNPOTUSBUJPO5JNF
    .BSLEPXOΛࣼΊಡΈ͢Δ
    

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13. TDBMBJP4PVSDF
    w ϩʔΧϧϦϞʔτͷϑΝΠϧಡΈॻ͖ʹศར
    w ςΩετϑΝΠϧΛߦ୯ҐDIBS୯ҐͰJUBSBUJWFʹ

    ॲཧͰ͖ΔͷͰɺϑΝΠϧαΠζ͕େ͖ͯ͘΋҆৺
    w HFU-JOFTͯ͠ίϨΫγϣϯϝιουͰΩϝΔͳͲ
    

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14. #

    %FNPOTUSBUJPO5JNF
    εΫϨΠϐϯάΛ΍ͬͯΈΔ
    

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15. 4USJOH*OUFSQPMBUJPO
    w จࣈྻϦςϥϧͷલʹTΛ෇͚Δͱɺม਺Λల։Ͱ͖Δ
    val price = 1000
    s"Price is $price"
    // => Price is 1000
    

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16. 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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17. 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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18. 
    $-*πʔϧʹͯ͠͸

    ΋ͬ͞Γ͗͢͠͡Όͳ͍ʁ
    ύΠϓͱ͔ͰΨϯΨϯͭͳ͍ͰαΫαΫಈ͔͍ͨ͠ΜͰ͚͢Ͳɻ
    

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19. 
    $-*πʔϧʹͯ͠͸

    ΋ͬ͞Γ͗͢͠͡Όͳ͍ʁ
    ύΠϓͱ͔ͰΨϯΨϯͭͳ͍ͰαΫαΫಈ͔͍ͨ͠ΜͰ͚͢Ͳɻ
    
    ࣮ߦՄೳͳόΠφϦΛੜ੒͠

    αΫαΫಈ͔͢͜ͱ΋Ͱ͖·͢
    4DBMB/BUJWF΍(SBBM7.ͷ4VCTUSBJU7.Λ࢖͍ɺ

    (PͷΑ͏ʹ࣮ߦՄೳͳόΠφϦΛੜ੒͢Δ͜ͱ΋ՄೳͰ͢ɻ
    +7.ͷىಈΛ଴ͨͣʹαΫαΫಈ͔͢͜ͱ͕Ͱ͖·͢ʂ
    

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20. IUUQXXXTDBMBOBUJWFPSHFOW
    

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21. #

    %FNPOTUSBUJPO5JNF
    .BSLEPXOࣼΊಡΈΛ4DBMB/BUJWFͰߴ଎Խ
    

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22. ·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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23. 
    5IBOLZPV
    Some(question) match {
    case Twitter => "@todokr"
    case GitHub => "@todokr"
    case Facebook => "shunsuke.tadokoro"
    case _ => invokeDynamic
    }
    

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