c4ebd80669
Implements conf.Load to populate tagged structs from a chain of Sources (env, .env, YAML/JSON/TOML, custom). Supports default values, slice separators, nested structs, pointer fields, and a Validator hook. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
34 lines
776 B
Go
34 lines
776 B
Go
package conf
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import "os"
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// Source returns a string value for a key, or false if the key is not present.
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type Source interface {
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Lookup(key string) (string, bool)
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}
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type envSource struct{}
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func (envSource) Lookup(key string) (string, bool) {
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v, ok := os.LookupEnv(key)
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if !ok || v == "" {
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return "", false
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}
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return v, true
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}
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// EnvSource reads from the process environment. Empty values are treated as absent.
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func EnvSource() Source { return envSource{} }
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type mapSource map[string]string
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func (m mapSource) Lookup(key string) (string, bool) {
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v, ok := m[key]
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if !ok || v == "" {
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return "", false
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}
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return v, true
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}
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// MapSource wraps a key/value map as a Source. The map is not copied.
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func MapSource(m map[string]string) Source { return mapSource(m) }
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