OSSで楽に作るGo言語クライアントツール

Goの入門に最適です

Transcript

1. github.com/codegangsta/cli OSSͰָʹ࡞ΔGoݴޠΫϥΠΞϯτπʔϧ makoto tano - @makotano ஶ࡞ݖදه / GoݴޠͷΩϟϥΫλʔGopherͷݪஶ࡞ऀ͸Renée French͞ΜͰ͢ɻ
2. Makoto Tano Golang Engineer @ @makotano ʮ͸͡ΊͷҰาʯ͕޷͖ͰϘΫγϯά΍ͬͯ·͢
3. Goݴޠָ͍͠Ͱ͢ʂ • Syntax͕γϯϓϧɺ͔ͩΒؾܰʹॻ͚Δ • ίϯύΠϧ͢Δ͔Βಈ࡞଎͍ • ܕ͕͋Δ͔Β҆৺ͯ͠ॻ͚Δ ؆୯ʹࢼͯ͠ɺ
 ʮͪΐͬͱ͚ͩͳΒॻ͚·͢Αʂ ʯ
 ʹ࠷దͳݴޠɻʢͱࢥͬͯϚεʣ
4. Hello WorldҎ্ʹษڧ͢Δʹ͸ʂ ΞϓϦΛ͕ͬͪΓॻ͘ඞཁͳΜͯͳ͍ʂ
 ίϚϯυϥΠϯπʔϧΛ࡞Γ·͠ΐ͏ʂ
5. ίϚϯυϥΠϯπʔϧͰؾʹ͢Δ͜ͱ 1. {command} = ίϚϯυຊମ w w w w w w 2. {command} -R = ίϚϯυΦϓγϣϯ w w w w w w w w w 3. {command} args.. = ύϥϝʔλ w w w w w 4. {command} help = ίϚϯυϔϧϓ w w w w w w w ɾɾɾ͍ͬͺ͍΍Δ͜ͱΞϧωɻ
6. OSSͰղܾͰ͖·͢ʂ github.com/codegangsta/cli ɹઌ΄Ͳͷ̐ཁૉΛඪ४ύοέʔδͰॻ͘ͷ͸େมɻ
 ͔͠͠ɺ͜ͷOSSΛ࢖͑͹੔ཧͯ͠ॻ͚·͢ɻ ͔͠΋ɺίϚϯυϥΠϯπʔϧΛ࡞Δ࣌ͷςϯϓϨʔτ΋࡞Γ·ͨ͠ʂ https://gist.github.com/MakoTano/624fe3fdea914b262e2c
7. ςϯϓϨʔτͷղઆ
 1. ίϚϯυຊମ app.Commands = []cli.Command{ { Name: "hello", Aliases: []string{"h"}, Usage: "show Hello World", Action: func(c *cli.Context) { }, }, } ίϚϯυ໊ γϣʔτΧοτ ίϚϯυϔϧϓ ͜͜ʹίϚϯυ಺༰Λॻ͘
 ʢษڧͷ͠Ͳ͜ΖͰ͢ʂʣ
8. ςϯϓϨʔτͷղઆ
 2. ίϚϯυΦϓγϣϯ app.Flags = []cli.Flag{ cli.BoolFlag{ Name: "dryrun, d", }, } Φϓγϣϯ͸Flagͱݺͼ·͢ ϩϯά/γϣʔτωʔϜ “Value”Λ଍͢ͱσϑΥϧτ஋͕ࢦఆՄೳ
9. ςϯϓϨʔτͷղઆ
 3. ύϥϝʔλ var paramFirst = "" if len(c.Args()) > 0 { paramFirst = c.Args()[0] } c.Args() Ͱ഑ྻ͕[]stringͰฦΔ .First(), .Tail() ͳͲͰ΋औಘՄೳ
10. ςϯϓϨʔτͷղઆ
 4. ίϚϯυϔϧϓ mako ~/dev/gopath1.5.2/src/sample $ go run main.go NAME: sample_client - github.com/codegangsta/cli ͷςϯϓϨʔτͰ͢ USAGE: main [global options] command [command options] [arguments...] VERSION: 0.0.1 COMMANDS: hello, h hello world Λදࣔ͠·͢ help, h Shows a list of commands or help for one command GLOBAL OPTIONS: --dryrun, -d --help, -h show help --version, -v print the version ͳΜͱطʹͰ͖ͪΌͬͯ·͢ʂ ΠϠοϑʔʂ
11. ༻ҙͨ͠gistςϯϓϨʔτͷ࣌఺Ͱ͜͜·Ͱಈ͖·͢ # Setup mako ~/dev/gopath1.5.2/src/sample $ go get github.com/codegangsta/cli # Execute
 mako ~/dev/gopath1.5.2/src/sample $ vi main.go # ςϯϓϨΛίϐϖ mako ~/dev/gopath1.5.2/src/sample $ go run main.go —dryrun hello Tom ։࢝ this is dry-run
 Hello world! Tom
 ऴྃ
12. ͓ΘΓ • GoͷSyntaxษڧ͸ʮγϡοͱ golang ʹೖ໳͢Δ࿩ʯ ͕ݸਓతʹ͸޷͖Ͱ͢ɻ
 http://sixeight.hatenablog.com/entry/2015/03/16/032222 • ਺࣌ؒͱΔ͚ͩͰɺGopherʹͳΕΔνϟϯεʂ ಀ͢ w w Θ͚ʹ͸͍͔ͳ͍Ͱ͢Ͷʂ
 w w w w w w w w ʢͦ͜·Ͱͷ͜ͱ͔ͬͯ࿩΋͋Γ·͕͢ʣ • GoݴޠΠϕϯτ΍ͬͯΔ͔Β༡ͼʹ͖ͯͶʂ
 http://eure.connpass.com/