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Add string replacer interface

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Mark Sagi-Kazar 2019-01-04 23:17:38 +01:00
parent d104d259b3
commit d77e7a7fbf
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2 changed files with 13 additions and 7 deletions
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6
README.md
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@ -185,8 +185,8 @@ with ENV:
* `AutomaticEnv()`
* `BindEnv(string...) : error`
* `SetEnvPrefix(string)`
* `SetEnvKeyReplacer(string...) *strings.Replacer`
* `AllowEmptyEnvVar(bool)`
* `SetEnvKeyReplacer(StringReplacer)`
* `AllowEmptyEnvVar(bool)`
_When working with ENV variables, it’s important to recognize that Viper
treats ENV variables as case sensitive._
@ -213,7 +213,7 @@ time a `viper.Get` request is made. It will apply the following rules. It will
check for a environment variable with a name matching the key uppercased and
prefixed with the `EnvPrefix` if set.
`SetEnvKeyReplacer` allows you to use a `strings.Replacer` object to rewrite Env
`SetEnvKeyReplacer` allows you to use a `StringReplacer` object to rewrite Env
keys to an extent. This is useful if you want to use `-` or something in your
`Get()` calls, but want your environmental variables to use `_` delimiters. An
example of using it can be found in `viper_test.go`.

14
viper.go
View file

@ -131,6 +131,12 @@ func DecodeHook(hook mapstructure.DecodeHookFunc) DecoderConfigOption {
}
}
// StringReplacer applies a set of replacements to a string.
type StringReplacer interface {
// Replace returns a copy of s with all replacements performed.
Replace(s string) string
}
// Viper is a prioritized configuration registry. It
// maintains a set of configuration sources, fetches
// values to populate those, and provides them according
@ -186,7 +192,7 @@ type Viper struct {
envPrefix string
automaticEnvApplied bool
envKeyReplacer *strings.Replacer
envKeyReplacer StringReplacer
allowEmptyEnv bool
config map[string]interface{}
@ -1095,11 +1101,11 @@ func (v *Viper) AutomaticEnv() {
v.automaticEnvApplied = true
}
// SetEnvKeyReplacer sets the strings.Replacer on the viper object
// SetEnvKeyReplacer sets the StringReplacer on the viper object
// Useful for mapping an environmental variable to a key that does
// not match it.
func SetEnvKeyReplacer(r *strings.Replacer) { v.SetEnvKeyReplacer(r) }
func (v *Viper) SetEnvKeyReplacer(r *strings.Replacer) {
func SetEnvKeyReplacer(r StringReplacer) { v.SetEnvKeyReplacer(r) }
func (v *Viper) SetEnvKeyReplacer(r StringReplacer) {
v.envKeyReplacer = r
}