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30 lines
534 B
Go
30 lines
534 B
Go
package vars
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import (
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"errors"
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"os"
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)
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var errEnvMustBeString = errors.New("environment variable can only be set string values")
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type envVariable struct {
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name string
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}
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func (ev envVariable) Set(val interface{}) error {
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if s, ok := val.(string); ok {
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os.Setenv(ev.name, s)
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return nil
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}
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return errEnvMustBeString
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}
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func (ev envVariable) Get() interface{} {
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return os.Getenv(ev.name)
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}
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// FromEnv returns a Var corresponding to the named environment variable.
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func FromEnv(name string) Var {
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return envVariable{name}
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}
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