55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
package nomino
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import (
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"fmt"
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"strconv"
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)
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type incConf struct {
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start int
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step int
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cb func(int) string
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}
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// IncrementalOption sets an option for the [Incremental] [Generator].
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type IncrementalOption func(c *incConf)
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// Incremental generates a name that is a series of integers.
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// By default it begins at 0 and increments by 1 each time.
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func Incremental(opts ...IncrementalOption) Generator {
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c := incConf{step: 1, cb: strconv.Itoa}
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for _, opt := range opts {
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opt(&c)
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}
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next := c.start
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return func(*Config) (string, error) {
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out := c.cb(next)
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next += c.step
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return out, nil
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}
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}
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// IncrementalStart sets the starting integer for [Incremental].
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func IncrementalStart(start int) IncrementalOption {
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return func(c *incConf) {
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c.start = start
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}
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}
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// IncrementalStepsets the step by which [Incremental] increases with each invocation.
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func IncrementalStep(step int) IncrementalOption {
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return func(c *incConf) {
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c.step = step
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}
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}
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// IncrementalFormatsets the format for the number generated by [Incremental].
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// It will be formatted with Printf. This is mostly likely useful with a format like "%02d".
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func IncrementalFormat(format string) IncrementalOption {
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return func(c *incConf) {
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c.cb = func(i int) string {
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return fmt.Sprintf(format, i)
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}
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}
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}
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