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コマンドラインオプションをパースするコードをコマンドラインオプションから生成するツールをつくった/fukuokago14_flagen
monochromegane
October 25, 2019
Programming
0
1.1k
コマンドラインオプションをパースするコードをコマンドラインオプションから生成するツールをつくった/fukuokago14_flagen
Fukuoka.go#14+Umeda.go
https://fukuokago.connpass.com/event/146447/
monochromegane
October 25, 2019
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Transcript
ࡾ༔հ / Pepabo R&D Institute, GMO Pepabo, Inc. 2019.10.25 Fukuoka.go#14+Umeda.go
ίϚϯυϥΠϯΦϓγϣϯΛύʔε͢ ΔίʔυΛίϚϯυϥΠϯΦϓγϣϯ ͔Βੜ͢ΔπʔϧΛͭͬͨ͘
1SJODJQBMFOHJOFFS :VTVLF.*:",&!NPOPDISPNFHBOF 1FQBCP3%*OTUJUVUF (.01FQBCP *OD IUUQTCMPHNPOPDISPNFHBOFDPN
GopherCon 2019 3 :VTVLF.JZBLF 0QUJNJ[BUJPOGPS/VNCFSPGHPSPVUJOFT6TJOH'FFECBDL$POUSPM (PQIFS$PO.BSSJPUU.BSRVJT4BO%JFHP.BSJOB $BMJGPSOJB +VMZ
1. ͡Ίʹ 2. ίϚϯυϥΠϯΦϓγϣϯΛύʔε͢ΔίʔυΛίϚϯ υϥΠϯΦϓγϣϯ͔Βੜ͢Δ 3. ·ͱΊ 4 ࣍
1. ͡Ίʹ
• ίϚϯυϥΠϯϓϩάϥϜͷڍಈΛ࣮ߦ࣌ʹมߋͤ͞ΔͨΊʹ֎෦͔ΒҾ ΦϓγϣϯΛࢦఆ͢Δ • ୯ͳΔจࣈྻͰ͋ΔͨΊɺίϚϯυϥΠϯϓϩάϥϜͰ͜ΕΒͷղੳॲཧΛ ߦ͍ɺ෦ͷมͱ֨ೲ͢Δ • ࠷୯७ͳͷͰ͋Εɺۭന۠Γ (cp src
dest) • Ґஔ͕ҙຯΛ͕࣋ͭ׳श͋ΕͲɺ͜ͷؔੑ໌֬Ͱͳ͍ • Ґஔʹґଘ͠ͳ͍Φϓγϣϯܗࣜ (cp -r, head -n 10…) • ϢʔβϑϨϯυϦʔͰ͋Δ͕ղੳॲཧෳࡶʹͳΔ 6 ίϚϯυϥΠϯҾͱΦϓγϣϯ
• ίϚϯυϥΠϯΦϓγϣϯͷղੳॲཧݴޠඪ४ͷͷϥΠϒϥϦ͔Βͨ͘ ͞Μఏڙ͞Ε͍ͯΔʢflag, getopts, argparse, optparse…ʣ • શ෦Λ֮͑Δͷ͍͠ͷͰɺݴޠϥΠϒϥϦ͝ͱʹυΩϡϝϯτΛࢀর͠ ͳ͕Β࣮͢Δ •
Ͳ͏͕͔͔ͯ࣌ؒ͠Δ • ఆܕॲཧͰ͋Δ͜ͱ͔Βɺߟ͑͏ΔύλʔϯΛهड़ͨ͠ϘΠϥʔςϯϓϨʔτ Λ४උ͢Δ • ൚༻తͳϘΠϥʔςϯϓϨʔτͲ͏ͯ͠ฤूՕॴ͕ଟ͘ͳΔʢΦϓγϣ ϯ໊ɺม໊ɺσϑΥϧτ…ʣ 7 ίϚϯυϥΠϯΦϓγϣϯ
8 ίϚϯυϥΠϯΦϓγϣϯղੳͷ՝ͷཧ $ mycli --dist erlang -e k/l --lambda 1.5
-k 1 -v 1. ίϚϯυϥΠϯΦϓγϣϯͷܗࣜΛݕ౼͢Δ 2. ࣮͢Δ 1. υΩϡϝϯτͷࢀরͱ࣮ 2. ϘΠϥʔςϯϓϨʔτͷίϐʔͱฤू 3. ຊདྷͷॲཧͷ࣮
9 ίϚϯυϥΠϯΦϓγϣϯղੳͷ՝ͷཧ $ mycli --dist erlang -e k/l --lambda 1.5
-k 1 -v 1. ίϚϯυϥΠϯΦϓγϣϯͷܗࣜΛݕ౼͢Δ 2. ࣮͢Δ 1. υΩϡϝϯτͷࢀরͱ࣮ 2. ϘΠϥʔςϯϓϨʔτͷίϐʔͱฤू 3. ຊདྷͷॲཧͷ࣮ ͜͜ͷ࣌ؒΛݶΓͳ͘ θϩʹ͚͍ۙͮͨ
2. ίϚϯυϥΠϯΦϓγϣϯΛύʔε͢ΔίʔυΛ ίϚϯυϥΠϯΦϓγϣϯ͔Βੜ͢Δ
• A command line option parser generator (Flag-gen). • https://github.com/monochromegane/flagen
• ࣮ࡍʹ͏ࡍͷίϚϯυϥΠϯΦϓγϣϯ͔ΒɺʮͦͷʯίϚϯυϥΠϯΦϓ γϣϯΛղੳ͢ΔϘΠϥʔςϯϓϨʔτΛੜ͢Δ • ͍ํΛࢥ͍ු͔Δͱ࣮͕Ͱ͖͍ͯΔʂʂ 11 flagen
Usage $ flagen YOUR_TEMPLATE YOUR_COMMAND_LINE_OPTIONS... 12 • ςϯϓϨʔτͱ࣮ࡍʹ͏࣌ͷίϚϯυϥΠϯΦϓγϣϯΛ͚ͩ͢ • ϓϦηοτͷςϯϓϨʔτͱͯ͠ɺGoɺRubyɺPythonɺShellΛఏڙ
• ϑΝΠϧύεΛࢦఆ͢ΕಠࣗςϯϓϨʔτར༻Մೳʢޙड़ʣ
Example of Go (preset template) 13 $ flagen go --dist
erlang -e k/l --lambda 1.5 -k 1 -v var ( dist string e string lambda float64 k int v bool ) func init() { flag.StringVar(&dist, "dist", "erlang", "usage of dist") flag.StringVar(&e, "e", "k/l", "usage of e") flag.Float64Var(&lambda, "lambda", 1.5, "usage of lambda") flag.IntVar(&k, "k", 1, "usage of k") flag.BoolVar(&v, "v", false, "usage of v") } ίϚϯυϥΠϯΦϓγϣϯ໊͔Βม໊Λੜ ίϚϯυϥΠϯΦϓγϣϯ͔ΒܕΛਪଌ ࣮ࡍʹ༻͢ΔίϚϯυϥΠϯΦϓγϣϯ͔Β ίϚϯυϥΠϯͷղੳॲཧΛੜ
Example of Python (preset template) 14 $ flagen py --dist
erlang -e k/l --lambda 1.5 -k 1 -v import argparse parser = argparse.ArgumentParser() parser.add_argument("--dist", default="erlang", help="Help of dist") parser.add_argument("-e", default="k/l", help="Help of e") parser.add_argument("--lambda", type=float, default=1.5, help="Help of lambda") parser.add_argument("-k", type=int, default=1, help="Help of k") parser.add_argument("-v", action="store_false", help="Help of v") args = parser.parse_args() ϋϚΓ͕ͪͳ1ZUIPOͷCPPMͷσϑΥϧτͷઃఆ ϘΠϥʔςϯϓϨʔτͳͷͰେৎ
Example of Ruby (preset template) 15 $ flagen rb --dist
erlang -e k/l --lambda 1.5 -k 1 -v require 'optparse' opts = { dist: 'erlang', e: 'k/l', lambda: 1.5, k: 1, v: false, } OptionParser.new do |op| op.on('--dist [VALUE]', 'Desc of dist') {|v| opts[:dist] = v } op.on('-e [VALUE]', 'Desc of e') {|v| opts[:e] = v } op.on('--lambda [VALUE]', 'Desc of lambda') {|v| opts[:lambda] = v.to_f } op.on('-k [VALUE]', 'Desc of k') {|v| opts[:k] = v.to_i } op.on('-v', 'Desc of v') {|v| opts[:v] = v } op.parse!(ARGV) end
Example of Shell (preset template) 16 $ flagen sh --dist
erlang -e k/l --lambda 1.5 -k 1 -v E="k/l" K="1" V="FALSE" while getopts e:k:v OPT do case $OPT in "e" ) E="$OPTARG";; "k" ) K="$OPTARG";; "v" ) V="TRUE";; esac done shift `expr $OPTIND - 1` HFUPQUTҰจࣈͷҾ͚ͩѻ͑ΔͷͰ͍Φϓγϣϯແࢹ
• ͪΖΜflagenಠࣗςϯϓϨʔτ͑Δ • ςϯϓϨʔτGoͷtext/templateΛͬͯॲཧ • `.Flags`ʹΦϓγϣϯͷղੳ݁Ռ • NameͱValueΛ࣋ͭ • Value͞ΒʹTypeͱGetΛ࣋ͭ
• `.Args`ʹΓͷҾ 17 Template
Template
Template {{ range $flag := .Flags -}} {{ $flag.Name }}={{
$flag.Value.Get}}({{ $flag.Value.Type }}) {{ end }} 19 $ flagen my.tmpl --dist erlang -e k/l --lambda 1.5 -k 1 -v dist=erlang(string) e=k/l(string) lambda=1.5(float) k=1(int) v=false(bool)
Template (Functions) {{ range $flag := .Flags -}} {{ ToCamel
$flag.Name }}={{ $flag.Value.Get}} {{ end }} 20 Dist=erlang E=k/l Lambda=1.5 K=1 V=false
Collaboration
• flagenΛΤσΟλͱ࿈ܞ͢Δ • ྫ͑VimͰҎԼʹΑΓɺΧʔιϧҐஔʹ݁ՌΛૠೖ͢Δ͜ͱ͕Ͱ͖Δɻ ʢಈతͳίʔυεχϖοτͱͯ͠ͷར༻ʣ 22 Collaboration :r!flagen YOUR_TEMPLATE YOUR_COMMAND_LINE_OPTIONS...
• flagenΛࣗલͷϘΠϥʔςϯϓϨʔτπʔϧͱ࿈ܞ͢Δ • πʔϧ͕GoͰ͋ΕɺflagenΛϥΠϒϥϦͱͯ͠ར༻͢Δ͜ͱ͕Ͱ͖Δ 23 Collaboration tmpl, err := flagen.NewTemplate(args[0])
if err != nil { return err } return tmpl.Execute(outStream, args[1:]) ςϯϓϨʔτΛࢦఆ ग़ྗઌͱ ίϚϯυϥΠϯΦϓγϣϯΛࢦఆ 4FFBMTP<(PEPD> IUUQTHPEPDPSHHJUIVCDPNNPOPDISPNFHBOFqBHFO
Workaround
• ᐆດͳϑϥά • flagenΦϓγϣϯʹ͕ࢦఆ͞Ε͍ͯͳ͍ͱ͖ʹboolͩͱݟͳͨ͢Ίɺ boolϑϥάͰऴΘͬͯҾ͕͋Δ߹ʹஅ͕͔ͭͳ͍ • ఆͲ͓Γʹ͢ΔͨΊʹͱͯ͠true or falseΛड͚औΔ͜ͱΛ໌ࣔ͢Δ 25
Workarounds - Ambiguous flag $ flagen TEMPLATE --bool-flag arg1 $ flagen TEMPLATE --bool-flag=false arg1
Implementation of template
• ExampleςετΛ༻ҙͯ͠ग़ྗ݁ՌΛςετ͢Δ͠ • Godocʹྫ͕ग़ྗ͞ΕΔͷͰศར • ग़ྗ༗ແͷΓ͚ with action͕ศར 27 ςϯϓϨʔτͷ࣮
3. ·ͱΊ
• ༷ʑͳ࣮͕ఏڙ͞Ε͍ͯΔίϚϯυϥΠϯΦϓγϣϯͷղੳॲཧΛར༻ܗࣜ ͔Βಈతʹੜ͢ΔδΣωϨʔλʔͱͯ͠flagenΛͭͬͨ͘ • ͍͔ͭ͘ͷݴޠͷςϯϓϨʔτΛ༻ҙͯ͠ΤσΟλͱ࿈ܞͤ͞Δ͜ͱͰCLI։ ൃͷޮ͕վળͨ͠ • flagenࣗମͷΦϓγϣϯͱͯ͠prefixͳͲΛఏڙ͢Εߏମͱͷ૬ੑΑ͘ ͳΓͦ͏ (hoge.nameͷΑ͏ͳ͍ํ)
• ςϯϓϨʔτՃͷϓϧϦΫΤετΠγϡʔͳͲ͓͍ͪͯ͠·͢ • https://github.com/monochromegane/flagen 29 ·ͱΊ
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