Alec Thomas
fbe8d48e4b
This ensures that hooks correctly detect when values are set via environment variables. Fixes #73.
22 lines
442 B
Go
22 lines
442 B
Go
package kong
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import (
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"os"
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)
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// EnvarResolver resolves values from environment variables.
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//
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// It is installed by default. Use ClearResolvers() to disable this.
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func EnvarResolver() Resolver {
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return ResolverFunc(func(context *Context, parent *Path, flag *Flag) (interface{}, error) {
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if flag.Tag.Env == "" {
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return nil, nil
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}
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envar := os.Getenv(flag.Tag.Env)
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if envar != "" {
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return envar, nil
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}
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return nil, nil
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})
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}
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