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go-config's Issues

Masterminds/sprig を組み込むのはどうか?

https://github.com/Masterminds/sprig

自分はライブラリ利用しかしないのでどっちでも良いのですが、のっぴきならない理由で環境ごとにリストの数が異なるようなケースのときFOO=hoge,fuga,foo みたいな環境設定にして下記のようなことをしたいというケースが合ったのですが、Funcs の存在間がだいぶ薄いので入れちゃっても良いのでは?と思いました。

items: {{ range splitList "," (env "FOO") }}
  - {{ . }}
{{ end }}

Masterminds/sprig入れるとなんでも出来る過ぎる...という説もありますが

参考: 自分で入れる場合

import (
    "github.com/Masterminds/sprig/v3"
    "github.com/kayac/go-config"
)

var conf = MyConfig{}

func Load() {
    config.Funcs(sprig.HermeticTxtFuncMap())
    paths = strings.Split(os.Getenv("CONFIG_PATH"), ",")
    if err := config.LoadWithEnv(&conf, paths...); err != nil {
    }
}

Consider environment variables with empty values

空の値で定義される環境変数 FOO を x{{ env "FOO" "DEFAULT" }}x で展開した場合、xx とは出力されず、FOO が未定義の場合と同様に xDEFAULTx となるようです。

env による環境変数の取得には os.Getenv が使用されており、

v = os.Getenv(k)

空の値で定義される場合と未定義の場合とで区別なく扱われるためだと認識していますが、 こちらは go-config の意図通りの挙動でしょうか。

以下再現コードになります。
https://play.golang.org/p/XUjO2XkD8pS

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