20 lines
506 B
Go
20 lines
506 B
Go
package template
|
|
|
|
import (
|
|
"log"
|
|
"sync"
|
|
)
|
|
|
|
// DeprecatedTemplateFunc wraps a template func to warn users that it's
|
|
// deprecated. The deprecation warning is called only once.
|
|
func DeprecatedTemplateFunc(funcName, useInstead string, deprecated func(string) string) func(string) string {
|
|
once := sync.Once{}
|
|
return func(in string) string {
|
|
once.Do(func() {
|
|
log.Printf("[WARN]: the `%s` template func is deprecated, please use %s instead",
|
|
funcName, useInstead)
|
|
})
|
|
return deprecated(in)
|
|
}
|
|
}
|