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// Package hlog provides various functions for output messages.
package hlog
import (
"log"
"os"
"hakurei.app/container"
)
var o = &container.Suspendable{Downstream: os.Stderr}
// Prepare configures the system logger for [Suspend] and [Resume] to take effect.
func Prepare(prefix string) { log.SetPrefix(prefix + ": "); log.SetFlags(0); log.SetOutput(o) }
func Suspend() bool { return o.Suspend() }
func Resume() bool {
resumed, dropped, _, err := o.Resume()
if err != nil {
// probably going to result in an error as well,
// so this call is as good as unreachable
log.Printf("cannot dump buffer on resume: %v", err)
}
if resumed && dropped > 0 {
log.Fatalf("dropped %d bytes while output is suspended", dropped)
}
return resumed
}
func BeforeExit() {
if Resume() {
log.Printf("beforeExit reached on suspended output")
}
}
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