TypeScriptのコマンドラインパーサー

Transcript

1. TypeScriptͰ
   ίϚϯυϥΠϯ

   ύʔαʔ
   NodeֶԂ34ݶ໨
   ҏ౻ɹӯ
   

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2. ࣗݾ঺հ
   • ҏ౻ɹӯ (͍ͱ͏ɹ͖͋ͱʣ
   • @akito0107
   • όοΫΤϯυΤϯδχΞ
   • Go / TypeScriptΛॻ͍͍ͯ·͢
   • https://blog.akito0107.dev
   

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3. ໨࣍
   • ίϚϯυϥΠϯύʔαʔΛ࡞ͬͨ࿩
   • ͳͥ࡞͔ͬͨ
   • Demo
   • ࢖͍ํʹ͍ͭͯ
   

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4. Node.jsͰ

   ίϚϯυϥΠϯπʔϧΛ࡞Δ
   • ҎԼͷΑ͏ͳϥΠϒϥϦ͕༗໊
   • substack/minimist
   • tj/commander
   • cacjs/cac
   • yargs/yargs
   • ෳࡶͳΦϓγϣϯΛύʔε͢Δͱ͖ʹਏ͍
   

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5. Option Hell
   • ex) kubectl

   

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6. Sub command΋
   ͭΒ͍
   

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7. ίϚϯυϥΠϯͷΦϓγϣϯ
   • ͋Δఔ౓ෳࡶͳίϚϯυΛ࣮૷͠Α͏ͱͨ͠
   ৔߹ɺΦϓγϣϯͷ਺͕Ͳ͏ͯ͠΋๲Ε্
   ͕ͬͯ͠·͏
   • طଘϥΠϒϥϦͰෳࡶͳΦϓγϣϯΛѻ͓͏
   ͱ͢Δͱݫ͍͠(ͱࢥͬͯΔ)
   

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8. ex) commander
   

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9. ex) commander
   ܕ͕΄͍͠ʂʂʂʂ
   

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10. ܕ͕ͭ͘΍ͭΛ࡞ͬͨ
    • https://github.com/akito0107/marron-glace
    • σϞ
    

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11. ϑϥάͷఆٛͷ࢓ํ
    • makeStringFlag / makeBooleanFlag …
    • ͜ΕΒͷؔ਺ʹɺϑϥάͷ໊લͱΦϓγϣϯ
    ʢσϑΥϧτ࣌ͷ஋ɺhelpͰදࣔ͢Δจݴͳ
    ͲʣΛ౉͢
    

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12. <= Stringͷͱ͖͸stringҎ֎ڐ༰͠ͳ͍
    <=helpͷͱ͖ͷจݴ
    <= -s Ͱ΋ड͚ΒΕΔΑ͏ʹ
    —flag1 ͷϑϥάΛఆٛ
    —flag2 ͷϑϥάΛఆٛ
    

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13. ϑϥάͷreduce
    • reduceFlagͰෳ਺ͷϑϥάΛ·ͱΊΔ
    • reduceFlagͷฦΓ஋΋flagͳͷͰɺ࠶౓
    reduce͢Δ͜ͱ͕Ͱ͖Δ
    

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14. makeCommand
    • flagΛmakeCommandͷύϥϝʔλʹ౉͢
    <= ͜ͷ͋ͨΓ͸helpͰग़͢΍ͭ
    

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15. (positional)Arguments
    • `mv src target` ͷsrc, targetͷΑ͏ʹɺίϚϯ
    υʹΘͨ͢Ҿ਺΋ܕ෇͖Ͱαϙʔτ
    

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16. makeCommandʹΘͨ͢
    <= ͜͜ʹิ׬͕ޮ͘
    

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17. Sub commands
    • makeSubcommandHandlerΛ࢖͏
    <= ͜͜ʹsubCommandΛ͍ΕΔ
    

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18. Sub commandΛ࡞Δ
    <= ਌ίϚϯυͷflag
    <= subίϚϯυͷflag
    ↑ ਌ίϚϯυͱreduce͢Δ
    <- ਌ίϚϯυͷflagͱ

    subίϚϯυͷflag͕྆ํ࢖͑Δ
    

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19. ͦͷଞ
    • —helpͰϔϧϓίϚϯυ
    • ಠࣗܕͷflag
    • ৄ͘͠͸ϒϩάʹ
    

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20. ·ͱΊ
    • TypeScriptܕਪ࿦͕όϦόϦޮ͘ίϚϯυϥ
    ΠϯπʔϧΛ࡞ͬͨ
    • όάͳͲ͋Γ·ͨ͠Β࿈བྷ͍ͯͩ͘͠͞ʂ
    

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21. ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

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