55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
package config
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import (
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"strings"
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)
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// Sub returns subsection of the Config by name.
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//
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// Returns nil if subsection if missing.
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func (x *Config) Sub(name string) *Config {
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// copy path in order to prevent consequent violations
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ln := len(x.path)
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path := make([]string, ln, ln+1)
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copy(path, x.path)
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var defaultPath []string
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if x.defaultPath != nil {
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ln := len(x.defaultPath)
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defaultPath = make([]string, ln, ln+1)
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copy(defaultPath, x.defaultPath)
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}
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return &Config{
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v: x.v,
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path: append(path, name),
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defaultPath: append(defaultPath, name),
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}
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}
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// Value returns configuration value by name.
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//
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// Result can be casted to a particular type
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// via corresponding function (e.g. StringSlice).
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// Note: casting via Go `.()` operator is not
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// recommended.
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//
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// Returns nil if config is nil.
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func (x *Config) Value(name string) interface{} {
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value := x.v.Get(strings.Join(append(x.path, name), separator))
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if value != nil || x.defaultPath == nil {
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return value
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}
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return x.v.Get(strings.Join(append(x.defaultPath, name), separator))
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}
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// SetDefault sets fallback config for missing values.
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//
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// It supports only one level of nesting and is intended to be used
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// to provide default values.
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func (x *Config) SetDefault(from *Config) {
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x.defaultPath = make([]string, len(from.path))
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copy(x.defaultPath, from.path)
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}
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