41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package nomino
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import "errors"
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// Generator is a function that returns the "random" portion of the returned filename.
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// Technically, it doesn't necessarily need to be random, and could be based on time, or a counter,
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// for example.
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type Generator func(conf *Config) (string, error)
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// WithGenerator sets the specified generator
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func WithGenerator(g Generator) Option {
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return func(c *Config) {
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c.generator = g
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}
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}
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// ErrMissingGenerators is returned by a multi-generator if no generators are supplied.
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var ErrMissingGenerators = errors.New("no generators supplied")
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func missingGen(*Config) (string, error) {
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return "", ErrMissingGenerators
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}
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// MultiGeneratorInOrder allows the use of multiple generators. Each new invokation will use the next generator in turn.
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// If none are passed, the generator will always return ErrMissingGenerators.
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func MultiGeneratorInOrder(gens ...Generator) Generator {
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if len(gens) == 0 {
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return missingGen
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}
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if len(gens) == 1 {
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return gens[0]
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}
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var idx int
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return func(c *Config) (string, error) {
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st, err := gens[idx](c)
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idx = (idx + 1) % len(gens)
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return st, err
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}
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}
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