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 ָ͘͠
2. ୭ͩ ాॴ
   ॣ༎
   !UPEPLS
   ٻਓݕࡧΤϯδϯ
   8FCΫϩʔϥɺ޿ࠂ഑৴γεςϜɺ
 ޿ࠂϩάج൫ɺ0QFO*%
   $POOFDUೝূɺ3%#.4͓Ҿӽ͠
4. 4DBMB w +BWBͱͷ૬ޓӡ༻ੑ
   w γʔϜϨεͳݺͼग़͠ɺ+BWBඪ४ϥΠϒϥϦͷ࠶ར༻
   w ؆ܿੑ
   w লུՄೳͳߏจɺܕਪ࿦ɺڧྗͳඪ४ϥΠϒϥϦ
   w ந৅౓ͷߴ͍ίʔυɺ৽੍͍͠ޚߏจΛఆٛͰ͖Δදݱྗ
   w 8IBUͷڧௐɺ)PXͷӅณ
   w ੩తܕ෇͚
   w ݕূՄೳੑɺϦϑΝΫλͷ͠΍͢͞ɺυΩϡϝϯτੑ
5. 4DBMBΛձࣾͰ࢖͍͍͚ͨͲ
 Ͳ͏ͨ͠Β͍͍ͩΖ͏ʁ
   ձࣾͷٕज़తํ਑ͱ͔ɺϝϯόʔͷख़࿅౓ͱ͔ɺϓϩμΫτॻ͖௚͠ͱ͔
6. 4DBMBΛձࣾͰ࢖͍͍͚ͨͲ
 Ͳ͏ͨ͠Β͍͍ͩΖ͏ʁ
   ձࣾͷٕज़తํ਑ͱ͔ɺϝϯόʔͷख़࿅౓ͱ͔ɺϓϩμΫτॻ͖௚͠ͱ͔ ·ͣ࢖͍·͠ΐ͏ʂ
 ͍͖ͳΓϓϩμΫτʹಋೖ͢Δͷ͸େมɻ
 ͳͷͰɺ·ͣ͸ݸਓͰ׬݁͢Δۀ຿ʹ࢖ͬͯΈͯɺ
   ʮΑ͔ͬͨΑʂʯʮ໘ന͍Αʂʯͱ෍ڭ͍ͯ͘͠ͷ͕Α͍͔΋͠Ε·ͤΜɻ
7. 4DBMBͬͯɺͦͦ͜͜େ͖ͳ
 ϓϩμΫτ޲͚ͳΜ͡Όͳ͍ͷʁ
   5XJUUFSͱ͔"QBDIF
   4QBSLͱ͔ΞυςΫͱ͔
8. 4DBMBͬͯɺͦͦ͜͜େ͖ͳ
 ϓϩμΫτ޲͚ͳΜ͡Όͳ͍ͷʁ
   5XJUUFSͱ͔"QBDIF
   4QBSLͱ͔ΞυςΫͱ͔ ͪΐͬͱͨ͠εΫϦϓτΛ
 ॻ͘ͷʹ΋͍͍ײ͡Ͱ͢
   (*U)VCͷτϨϯυΛݟΔͱɺ͔֬ʹ෼ࢄγεςϜ΍Ϗοάσʔλɺ
 ػցֶशܥͷϓϩμΫτ͕ଟ͍Ͱ͢ɻ
   ͕ɺͪΐͬͱͨ͠ίʔυΛॻ͍ͯαοͱಈ͔͢͜ͱ΋࣮͸ಘҙͳΜͰ͢ɻ
9. r
   .BSUJO
   0EFSTLZ
   -FY
   4QPPO
   BOE
   #JMM
   7FOOFST 5IF
   OBNF
   4DBMB
   TUBOET
   GPS
   lTDBMBCMF
   MBOHVBHFz
   ʜ
 :PV
   DBO
   BQQMZ
   4DBMB
   UP
   
 B
   XJEF
   SBOHF
   PG
   QSPHSBNNJOH
   UBTLT
   
 GSPN
   XSJUJOH
   TNBMM
   TDSJQUT
   UP
   CVJMEJOH
   MBSHF
   TZTUFNT
   
10. 4DBMB͸େֻ͔ΓͳϓϩμΫτΛ࡞Δͷʹద͍ͯ͠ΔݴޠͰ͕͢ɺ
    )BDLZͳ਺ߦd਺ेߦͷ
 εΫϦϓςΟϯά΋े෼
 շదʹͰ͖·͢
11. 4DBMB͸େֻ͔ΓͳϓϩμΫτΛ࡞Δͷʹద͍ͯ͠ΔݴޠͰ͕͢ɺ
    )BDLZͳ਺ߦd਺ेߦͷ
 εΫϦϓςΟϯά΋े෼
 շదʹͰ͖·͢
12. #
 %FNPOTUSBUJPO
    5JNF
    .BSLEPXOΛࣼΊಡΈ͢Δ
13. TDBMBJP4PVSDF w ϩʔΧϧϦϞʔτͷϑΝΠϧಡΈॻ͖ʹศར
    w ςΩετϑΝΠϧΛߦ୯ҐDIBS୯ҐͰJUBSBUJWFʹ
 ॲཧͰ͖ΔͷͰɺϑΝΠϧαΠζ͕େ͖ͯ͘΋҆৺
    w HFU-JOFTͯ͠ίϨΫγϣϯϝιουͰΩϝΔͳͲ
14. #
 %FNPOTUSBUJPO
    5JNF
    εΫϨΠϐϯάΛ΍ͬͯΈΔ
15. 4USJOH
    *OUFSQPMBUJPO w จࣈྻϦςϥϧͷલʹTΛ෇͚Δͱɺม਺Λల։Ͱ͖Δ val price = 1000 s"Price is $price" // => Price is 1000
16. 5SJQMF
    2VPUF "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࢖͏
17. 4USJOH
    *OUFSQPMBUJPOͱ5SJQMF
    2VPUF 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΋
18. $-*πʔϧʹͯ͠͸
 ΋ͬ͞Γ͗͢͠͡Όͳ͍ʁ
    ύΠϓͱ͔ͰΨϯΨϯͭͳ͍ͰαΫαΫಈ͔͍ͨ͠ΜͰ͚͢Ͳɻ
19. $-*πʔϧʹͯ͠͸
 ΋ͬ͞Γ͗͢͠͡Όͳ͍ʁ
    ύΠϓͱ͔ͰΨϯΨϯͭͳ͍ͰαΫαΫಈ͔͍ͨ͠ΜͰ͚͢Ͳɻ ࣮ߦՄೳͳόΠφϦΛੜ੒͠
 αΫαΫಈ͔͢͜ͱ΋Ͱ͖·͢
    4DBMB
    /BUJWF΍(SBBM7.ͷ4VCTUSBJU7.Λ࢖͍ɺ
 (PͷΑ͏ʹ࣮ߦՄೳͳόΠφϦΛੜ੒͢Δ͜ͱ΋ՄೳͰ͢ɻ
    +7.ͷىಈΛ଴ͨͣʹαΫαΫಈ͔͢͜ͱ͕Ͱ͖·͢ʂ
20. IUUQXXXTDBMBOBUJWFPSHFOW
21. #
 %FNPOTUSBUJPO
    5JNF
    .BSLEPXOࣼΊಡΈΛ4DBMB
    /BUJWFͰߴ଎Խ
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 5SJQMF
    2VPUF
    w ࣮ߦՄೳͳόΠφϦΛੜ੒͢Δ͜ͱ΋Ͱ͖ΔΑʂ
    w αΫαΫಈ͍ͯɺͦͷ··νʔϜʹڞ༗΋Ͱ͖Δʂ
    w མͱ݀͠΋͋Δ͔ΒؾΛ͚ͭΑ͏ʂ
23. 
    5IBOL
    ZPV Some(question) match { case Twitter => "@todokr" case GitHub => "@todokr" case Facebook => "shunsuke.tadokoro" case _ => invokeDynamic }