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// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Paul Buetow
package repl
import (
"os"
"os/signal"
"syscall"
)
// SignalHandler manages signal handling for the REPL.
// It specifically listens for SIGINT (Ctrl+C) and executes a callback.
type SignalHandler struct {
sigChan chan os.Signal
}
// NewSignalHandler creates a new signal handler that listens for SIGINT.
// It creates a buffered channel to receive signals.
//
// Returns a new SignalHandler instance
func NewSignalHandler() *SignalHandler {
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, syscall.SIGINT)
return &SignalHandler{
sigChan: sigChan,
}
}
// Start starts the signal handler goroutine with the given callback.
// When SIGINT is received, the callback function is executed in the goroutine.
// The function blocks until Stop is called.
//
// callback: the function to execute when SIGINT is received
// Returns: no return value; executes callback in a separate goroutine
func (s *SignalHandler) Start(callback func()) {
go func() {
<-s.sigChan
callback()
}()
}
// Stop stops the signal handler by unregistering signals.
// After calling Stop, the signal handler will no longer trigger the callback.
func (s *SignalHandler) Stop() {
signal.Stop(s.sigChan)
}
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