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TypeScriptのコマンドラインパーサー
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Akito0107
June 27, 2019
Technology
1
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TypeScriptのコマンドラインパーサー
Akito0107
June 27, 2019
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Transcript
TypeScriptͰ ίϚϯυϥΠϯ ύʔαʔ NodeֶԂ34ݶ ҏ౻ɹӯ
ࣗݾհ • ҏ౻ɹӯ (͍ͱ͏ɹ͖͋ͱʣ • @akito0107 • όοΫΤϯυΤϯδχΞ • Go
/ TypeScriptΛॻ͍͍ͯ·͢ • https://blog.akito0107.dev
࣍ • ίϚϯυϥΠϯύʔαʔΛ࡞ͬͨ • ͳͥ࡞͔ͬͨ • Demo • ͍ํʹ͍ͭͯ
Node.jsͰ ίϚϯυϥΠϯπʔϧΛ࡞Δ • ҎԼͷΑ͏ͳϥΠϒϥϦ͕༗໊ • substack/minimist • tj/commander • cacjs/cac
• yargs/yargs • ෳࡶͳΦϓγϣϯΛύʔε͢Δͱ͖ʹਏ͍
Option Hell • ex) kubectl
Sub command ͭΒ͍
ίϚϯυϥΠϯͷΦϓγϣϯ • ͋ΔఔෳࡶͳίϚϯυΛ࣮͠Α͏ͱͨ͠ ߹ɺΦϓγϣϯͷ͕Ͳ͏ͯ͠Ε্ ͕ͬͯ͠·͏ • طଘϥΠϒϥϦͰෳࡶͳΦϓγϣϯΛѻ͓͏ ͱ͢Δͱݫ͍͠(ͱࢥͬͯΔ)
ex) commander
ex) commander ܕ͕΄͍͠ʂʂʂʂ
ܕ͕ͭͭ͘Λ࡞ͬͨ • https://github.com/akito0107/marron-glace • σϞ
ϑϥάͷఆٛͷํ • makeStringFlag / makeBooleanFlag … • ͜ΕΒͷؔʹɺϑϥάͷ໊લͱΦϓγϣϯ ʢσϑΥϧτ࣌ͷɺhelpͰදࣔ͢Δจݴͳ ͲʣΛ͢
<= Stringͷͱ͖stringҎ֎ڐ༰͠ͳ͍ <=helpͷͱ͖ͷจݴ <= -s Ͱड͚ΒΕΔΑ͏ʹ —flag1 ͷϑϥάΛఆٛ —flag2 ͷϑϥάΛఆٛ
ϑϥάͷreduce • reduceFlagͰෳͷϑϥάΛ·ͱΊΔ • reduceFlagͷฦΓflagͳͷͰɺ࠶ reduce͢Δ͜ͱ͕Ͱ͖Δ
makeCommand • flagΛmakeCommandͷύϥϝʔλʹ͢ <= ͜ͷ͋ͨΓhelpͰग़ͭ͢
(positional)Arguments • `mv src target` ͷsrc, targetͷΑ͏ʹɺίϚϯ υʹΘͨ͢Ҿܕ͖Ͱαϙʔτ
makeCommandʹΘͨ͢ <= ͜͜ʹิ͕ޮ͘
Sub commands • makeSubcommandHandlerΛ͏ <= ͜͜ʹsubCommandΛ͍ΕΔ
Sub commandΛ࡞Δ <= ίϚϯυͷflag <= subίϚϯυͷflag ↑ ίϚϯυͱreduce͢Δ <- ίϚϯυͷflagͱ
subίϚϯυͷflag͕྆ํ͑Δ
ͦͷଞ • —helpͰϔϧϓίϚϯυ • ಠࣗܕͷflag • ৄ͘͠ϒϩάʹ
·ͱΊ • TypeScriptܕਪ͕όϦόϦޮ͘ίϚϯυϥ ΠϯπʔϧΛ࡞ͬͨ • όάͳͲ͋Γ·ͨ͠Β࿈བྷ͍ͯͩ͘͠͞ʂ
͋Γ͕ͱ͏͍͟͝·ͨ͠