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
   

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2. Makoto Tano
   Golang Engineer @
   @makotano
   ʮ͸͡ΊͷҰาʯ͕޷͖ͰϘΫγϯά΍ͬͯ·͢
   

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3. Goݴޠָ͍͠Ͱ͢ʂ
   • Syntax͕γϯϓϧɺ͔ͩΒؾܰʹॻ͚Δ
   • ίϯύΠϧ͢Δ͔Βಈ࡞଎͍
   • ܕ͕͋Δ͔Β҆৺ͯ͠ॻ͚Δ
   ؆୯ʹࢼͯ͠ɺ

   ʮͪΐͬͱ͚ͩͳΒॻ͚·͢Αʂ ʯ

   ʹ࠷దͳݴޠɻʢͱࢥͬͯϚεʣ
   

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4. Hello WorldҎ্ʹษڧ͢Δʹ͸ʂ
   ΞϓϦΛ͕ͬͪΓॻ͘ඞཁͳΜͯͳ͍ʂ

   ίϚϯυϥΠϯπʔϧΛ࡞Γ·͠ΐ͏ʂ
   

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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
   

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6. OSSͰղܾͰ͖·͢ʂ
   github.com/codegangsta/cli
   ɹઌ΄Ͳͷ̐ཁૉΛඪ४ύοέʔδͰॻ͘ͷ͸େมɻ

   ͔͠͠ɺ͜ͷOSSΛ࢖͑͹੔ཧͯ͠ॻ͚·͢ɻ
   ͔͠΋ɺίϚϯυϥΠϯπʔϧΛ࡞Δ࣌ͷςϯϓϨʔτ΋࡞Γ·ͨ͠ʂ
   https://gist.github.com/MakoTano/624fe3fdea914b262e2c
   

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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
   

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8. ςϯϓϨʔτͷղઆ

   2. ίϚϯυΦϓγϣϯ
   app.Flags = []cli.Flag{
   cli.BoolFlag{
   Name: "dryrun, d",
   },
   }
   Φϓγϣϯ͸Flagͱݺͼ·͢
   ϩϯά/γϣʔτωʔϜ
   “Value”Λ଍͢ͱσϑΥϧτ஋͕ࢦఆՄೳ
   

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9. ςϯϓϨʔτͷղઆ

   3. ύϥϝʔλ
   var paramFirst = ""
   if len(c.Args()) > 0 {
   paramFirst = c.Args()[0]
   }
   c.Args() Ͱ഑ྻ͕[]stringͰฦΔ
   .First(), .Tail() ͳͲͰ΋औಘՄೳ
   

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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
    

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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
    

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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/
    

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